CN120497862A

CN120497862A - Power supply system control method, power supply system and computer readable storage medium

Info

Publication number: CN120497862A
Application number: CN202411254545.5A
Authority: CN
Inventors: 刘万启; 王雷; 陈熙
Original assignee: Shenzhen Zhenghao Zhizao Technology Co ltd
Current assignee: Shenzhen Zhenghao Zhizao Technology Co ltd
Priority date: 2024-09-06
Filing date: 2024-09-06
Publication date: 2025-08-15

Abstract

The present application provides a power supply system control method, a power supply system and a computer-readable storage medium. The power supply system includes a photovoltaic power generation device, a battery pack and a power converter. The first DC end of the power converter is connected to the photovoltaic power generation device; the second DC end of the power converter is connected to the battery pack, and the AC end of the power converter is connected to the power grid; the power converter is also connected to the target device. The power converter includes an MPPT circuit to track the maximum power point of the photovoltaic power generation device. The method includes: when the battery pack is in a charging state, obtaining the charging power of the battery pack; obtaining the working mode of the MPPT circuit; when the charging power is greater than the starting power of the target device, or when the MPPT circuit is in a power abandonment mode, starting and running the target device; the power abandonment mode is used to indicate that the MPPT circuit operates at a non-maximum power point. The power supply system control method provided in the present application can reduce the number of times the target device switches between start-up and shutdown, and improve the power efficiency of the power supply system.

Description

Power supply system control method, power supply system and computer readable storage medium

Technical Field

The present application relates to the field of clean energy technologies, and in particular, to a power supply system control method, a power supply system, and a computer readable storage medium.

Background

With the increasing climate change, clean energy technologies (such as photovoltaic power generation technology, water power generation technology, and wind power generation technology) capable of reducing carbon emissions are receiving attention. Taking a photovoltaic power generation technology as an example, the photovoltaic power generation technology is a technology for converting solar energy into electric energy to supply power to a load.

In the related art, in order to fully utilize solar energy resources, a local micro-grid system can be formed by a power supply system and a load, and the maximum utilization of the photovoltaic power generation technology is realized through power exchange between the local micro-grid system and a power grid. For example, in some power supply systems, a power converter may be used to convert dc power output by a photovoltaic panel into ac power to power an ac load, and an energy storage device may be used to store redundant power outside the photovoltaic panel supplied to the load, where the energy stored by the energy storage device may also be used by the load when the power generated by the photovoltaic panel is insufficient, and when there is redundant power outside the photovoltaic panel supplied to the load, a designated device (hereinafter simply referred to as a target device) may also be activated to consume the redundant power.

In the related art, a part of the power supply system prohibits power supply to the power grid through the power converter. In such a scenario, the magnitude of the redundant power of the power supply system cannot be confirmed. Therefore, the redundant power of the power supply system can only be utilized by attempting to turn on the target device. However, the target device is limited by the minimum use power of the target device, and the target device is easy to repeatedly try to start and stop due to insufficient redundant power of the power supply system.

Disclosure of Invention

In view of the above, the present application provides a power supply system control method to reduce the number of times that a target device is frequently switched between startup and shutdown due to insufficient power and to improve the power consumption efficiency of a power supply system on the premise that power supply to a power grid through a power converter is prohibited.

The first aspect of the application provides a control method of a power supply system, which is applied to a controller in the power supply system, wherein the power supply system comprises photovoltaic power generation equipment, a battery pack and a power converter. The power converter comprises a first direct current end, a second direct current end, an alternating current end and an MPPT circuit, wherein the first direct current end of the power converter is used for being connected with photovoltaic power generation equipment, the second direct current end of the power converter is used for being connected with a battery pack, the alternating current end of the power converter is used for being connected with a power grid, the power converter is further used for being connected with target equipment, and the power converter comprises an MPPT circuit for tracking the maximum power point of the photovoltaic power generation equipment. The method comprises the steps of obtaining charging power of a battery pack when the battery pack is in a charging state, obtaining a working mode of an MPPT circuit, starting and operating target equipment when the charging power is larger than starting power of the target equipment or the MPPT circuit is in a light discarding mode, wherein the light discarding mode is used for indicating that the MPPT circuit is operated at a non-maximum power point.

In one embodiment, when the power utilization priority of the target device is higher than that of the battery pack, starting and operating the target device comprises starting the target device according to the starting power of the target device, controlling the target device to operate according to the preset working power after the target device is started, wherein the preset working power is smaller than or equal to the starting power.

In one embodiment, the method further comprises turning off the target device when the battery pack power is below a preset power threshold.

In one embodiment, when the electricity utilization priority of the target device is lower than that of the battery pack, starting and operating the target device, wherein the method comprises the steps of starting the target device according to the starting power of the target device, and reducing the operating power of the target device after the target device is started until the charging power of the battery pack reaches the corresponding charging power upper limit value or the operating power of the target device is reduced to the preset power lower limit value.

In one embodiment, the method further comprises turning off the target device when the duration of operation of the target device at the preset power lower limit reaches a preset duration.

In one embodiment, the method further comprises turning off the target device when the charging power of the battery pack is less than a preset power threshold, the preset power threshold being less than a difference between the upper charging power limit and the lower preset power limit.

In one embodiment, prior to starting and operating the target device, the method further comprises determining a power usage priority relationship between the battery pack and the target device based on the power of the battery pack.

In an embodiment, determining the electricity priority relation between the battery pack and the target device according to the electric quantity of the battery pack includes determining that the electricity priority of the target device is higher than the electricity priority of the battery pack when the electric quantity of the battery pack is greater than or equal to a preset switching threshold value, and determining that the electricity priority of the target device is lower than the electricity priority of the battery pack when the electric quantity of the battery pack is less than the preset switching threshold value.

A second aspect of the present application provides a power supply system including a photovoltaic power generation device, a battery pack, and a power converter. The power supply system comprises a power supply system control method, a power supply system control system and a power supply system control method, wherein a first direct-current end of the power converter is used for being connected with photovoltaic power generation equipment, a second direct-current end of the power converter is used for being connected with a battery pack, an alternating-current end of the power converter is used for being connected with a power grid, the power converter is further used for being connected with target equipment, the power converter comprises an MPPT circuit for tracking the maximum power point of the photovoltaic power generation equipment, and the power supply system further comprises a controller used for executing the power supply system control method.

A third aspect of the present application provides a computer-readable storage medium storing a computer program. The computer program, when executed by a controller, causes the controller to implement the power supply system control method as set forth in any one of the preceding claims.

According to the power supply system control method provided by the application, the charging power of the battery pack in a charging state and the working mode of the MPPT circuit are firstly obtained, and then when the charging power is larger than the starting power of target equipment or the MPPT circuit is in a light discarding mode, the target equipment is started and operated. When the charging power is greater than the starting power of the target device, it means that the photovoltaic power generation device has redundant power in addition to the load, and the redundant power is greater than the starting power of the target device, and because the operating power of the target device is generally less than or equal to the starting power, the redundant power can meet the starting power and the operating power of the target device. When the MPPT circuit is in the light rejection mode, it indicates that there is still a possibility that the output power of the photovoltaic power generation device is increased, and the battery pack may be fully charged or the charging power of the battery pack may reach the charging power upper limit value, where the photovoltaic power generation device and/or the battery pack may supply power to the target device beyond meeting the power requirement of the load. Therefore, when the charging power is larger than the starting power of the target equipment or the MPPT circuit is in the light rejection mode, the target equipment is started and operated, and compared with the mode of attempting to start the target equipment in the related art, the normal operation of the target equipment in a period of time is obviously more likely to be maintained, so that the frequency of frequent switching between starting and stopping of the target equipment due to insufficient power is reduced, the operation stability of the target equipment is improved, and the electricity utilization efficiency of a power supply system under the premise of prohibiting power supply to a power grid is improved.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings that are required for the embodiments will be briefly described, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope of the present application. Like elements are numbered alike in the various figures.

Fig. 1 is a schematic diagram of an application scenario of a power supply system control method according to an embodiment of the present application.

Fig. 2 is a flowchart of a power supply system control method according to an embodiment of the application.

Fig. 3 is a schematic diagram of the substeps of starting and operating the target device in step S203 when the power utilization priority of the target device is higher than the power utilization priority of the battery pack.

Fig. 4 is a schematic diagram of the substeps of starting and operating the target device in step S203 when the power priority of the target device is lower than the power priority of the battery pack.

Fig. 5 is a schematic diagram of a graph of a theoretical maximum output power of a photovoltaic power generation device, an actual output power of the photovoltaic power generation device, a charging power of a battery pack, and an operation power of a target device according to a time change when the power supply system control method provided by the application is implemented.

Fig. 6 is a block diagram of a power supply system according to an embodiment of the present application.

Fig. 7 is a functional block diagram of an electronic device according to an embodiment of the present application.

Fig. 8 is a functional block diagram of a control device according to an embodiment of the present application.

Fig. 9 is a block diagram of a computer readable storage medium according to an embodiment of the present application.

Detailed Description

The following description of the technical solutions according to the embodiments of the present application will be given with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments.

It is noted that when one component is considered to be "connected" to another component, it may be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed" on another element, it can be directly on the other element or intervening elements may also be present. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "rear," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Some embodiments will be described below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

In the related art, in order to fully utilize solar energy resources, a local micro-grid system can be formed by a power supply system and target equipment, and the maximum utilization of the photovoltaic power generation technology is realized through power exchange between the local micro-grid system and a power grid. In some power supply systems, the power converter may be used to convert direct current output by the photovoltaic panel into alternating current to supply power to the load, the energy storage device may be further used to store redundant power outside the load supplied by the photovoltaic panel, the energy stored by the energy storage device may also be provided to the load for use when the generated power of the photovoltaic panel is insufficient, and when the redundant power outside the load is supplied by the photovoltaic panel, a designated device (hereinafter referred to as a target device) may be further started to consume the redundant power. For example, referring to fig. 1, fig. 1 is a schematic circuit connection diagram of a local micro-grid system 10 according to an embodiment of the application.

The local micro-grid system 10 shown in fig. 1 includes a power converter 110, a photovoltaic power generation device 120, a battery pack 130, a load 140, and a target device 150. Wherein the power converter 110, the photovoltaic power generation device 120, and the battery pack 130 form the power supply system 100. The first DC terminal DC1 of the power converter 110 is for connection with the photovoltaic power generation device 120, and the second DC terminal DC2 of the power converter 110 is for connection with the battery pack 130. In some embodiments, the first DC terminal DC1 and the second DC terminal DC2 of the power converter 110 are both connected to a DC bus (not shown). The AC side AC of the power converter 110 is used for connection to the grid 20. The first device connection CON1 of the power converter 110 is configured to be connected to the load 140, and the second device connection CON2 of the power converter 110 is configured to be connected to the target device 150. Load 140 and target device 150 may each be a variety of powered devices. When the power supply system 100 has redundant power, the target device 150 may be started to consume the redundant power, so as to improve the power consumption efficiency, and when the power supply system 100 provides insufficient power, the target device 150 may be turned off to ensure the power supply of the load 140. In some embodiments, the first device connection terminal CON1, the second device connection terminal CON2, and the AC terminal AC are all connected to an AC bus (not shown in the figure), and the AC terminal AC is connected to the power grid 20 through the AC bus. In some embodiments, the power supply system 100 further includes an MPPT circuit 111, where the MPPT circuit 111 is disposed between the photovoltaic power generation device 120 and the dc bus for performing maximum power point tracking (Maximum power point tracking, MPPT) on the photovoltaic power generation device 120. The present application is not limited to the maximum power tracking algorithm employed by MPPT circuit 111. In some embodiments, MPPT circuitry 111 may be disposed within power converter 110, in other embodiments, MPPT circuitry 111 may be disposed within photovoltaic power plant 120, and in other embodiments, MPPT circuitry 111 may be disposed independently of power converter 110 and photovoltaic power plant 120.

In some embodiments, the power converter 110 may be a bi-directional power converter. As such, when the power converter 110 is in the inverter mode, the dc power source is configured to convert dc power received by the dc power source into AC power for use by the consumer (including the target device 150 and/or the load 140) and/or for feeding the power grid 20 via the AC power source. When the power converter 110 is in the rectifying mode, the power converter is configured to convert alternating current received by the alternating current terminal AC into direct current to charge the battery pack 130 through the second direct current terminal DC 2.

In some embodiments, the power converter 110 may include a rectifying circuit and an inverter circuit. The switching logic and the duty ratio of the rectifier circuit and the inverter circuit are controlled, so that the mode switching between the rectifier mode and the inverter mode of the power converter 110 and the control of the output voltage are realized. In other embodiments, the power converter 110 may also use an existing bidirectional DC/AC conversion circuit, and the mode switching between the rectifying mode and the inverting mode of the power converter 110 and the control of the output voltage are implemented by using one bidirectional DC/AC conversion circuit. The specific circuit topology of the power converter 110 is not limited herein.

The photovoltaic power plant 120 comprises a number of photovoltaic panels. The photovoltaic panel outputs direct current to the power converter 110 by converting light energy into electrical energy. The present application is not limited to the manner in which the photovoltaic panels are connected in the photovoltaic power generation apparatus 120. For example, in some embodiments, the photovoltaic panels of the photovoltaic power plant 120 may be connected in series, in parallel, or connected in series followed by parallel, etc. In other embodiments, the photovoltaic power generation device 120 may be replaced by other electronic devices that can output direct current, such as a battery, a supercapacitor, and the like.

In some embodiments, MPPT circuit 111 is configured to output a voltage to the dc bus after converting the voltage input by photovoltaic power generation device 120. MPPT circuit 111 may be, for example, a boost (boost) circuit, a buck (buck) circuit, a buck-boost (buck-boost) circuit, or the like. In some embodiments, MPPT circuit 111 is disposed between first DC terminal DC1 and a DC bus (not shown).

The battery pack 130 includes one or more battery cells connected in series and/or parallel. The battery pack 130 is used to store or release energy. In some embodiments, the battery pack 130 may be a battery pack or an energy storage device, or may be a battery module disposed in an electronic device, and the present application is not limited to the specific type of battery pack 130.

The battery pack 130 may absorb the direct current from the second direct current terminal DC2 to charge, and/or the battery pack 130 may also discharge to the second direct current terminal DC2 to output the direct current to the power converter 110.

Load 140 and target device 150 may be various types of powered devices. In some embodiments, the load 140 and the target device 150 may be smart home, such as an air conditioner, a light, a television, a refrigerator, and the like. The controller in the power supply system 100 can be in communication connection with the smart home, so that the controller can realize power management of the smart home by remotely controlling the smart home. It is understood that the load 140 and the target device 150 may be one electric device or a plurality of electric devices, and the present application does not limit the number of devices included in the load 140 and the target device 150. Wherein, in different time periods, the same electric equipment can be used as the load 140 or the target equipment 150 according to the user requirement. For example, a user may divide all the electric devices connected to the power converter 110 through a user terminal installed with an APP (Application) to divide the load 140 and the target device 150.

The power grid 20 may be, for example, a utility power grid or other power distribution system. The application is not limited to the type of ac power of the power grid 20, and in other embodiments, the power grid 20 may be single phase ac power, split phase ac power, three phase ac power, or other multi-phase ac power, etc. Accordingly, the number of phase lines of the AC side AC of the power converter 110 may be adjusted according to the particular type of the corresponding power grid 20.

Thus, in the local micro grid system 10 shown in fig. 1, when the power output by the photovoltaic power generation device 120 is sufficient, the power output by the photovoltaic power generation device 120 may be obtained by using the power converter 110 to supply power to the load 140 and/or the target device 150, and the surplus energy of the photovoltaic power generation device 120 may also be supplied to the battery pack 130. The power converter 110 may be utilized to draw power from the grid 20 to power the load 140 when the photovoltaic power plant 120 is outputting insufficient power, and/or the energy stored by the battery pack 130 may be provided to the load 140 for use when the photovoltaic power plant 120 is outputting insufficient power.

In the related art, a part of the power supply system prohibits feeding the power grid 20 through the power converter 110. In such a scenario, the magnitude of the redundant power of the power supply system cannot be confirmed. Therefore, the redundant power of the power supply system can only be utilized by attempting to turn on the target device 150. However, due to the limitation of the minimum power used by the target device 150, the target device 150 is liable to repeatedly attempt to start and stop the target device 150 due to insufficient redundant power of the power supply system.

Based on this, the present application provides a power supply system control method to improve the situation that the target device 150 is not operating stably when the power supply to the power grid 20 through the power converter 110 is prohibited and there is redundant power in the power supply system.

The power supply system control method provided by the present application may be executed by a controller (not shown in fig. 1) in the power supply system 100. It is understood that the controller may be a controller of any device in the power supply system 100, or the controller may be a stand-alone controller. In some embodiments, the controller is loaded with the energy management system EMS (Energy Management System) and the EMS may communicate with some or all of the devices in the power supply system 100. The EMS may be used to perform the power supply system 100 control method provided by the present application. The communication between the EMS and each device in the power supply system 100 may be wireless communication (such as bluetooth communication, zigBee communication, etc.), or may be wired communication (such as serial communication based on RS-485 serial bus or controller area network (Controller Area Network, CAN) bus, or other parallel communication modes), and the present application is not limited to a specific communication mode.

Referring to fig. 2, fig. 2 is a flowchart illustrating a power supply system control method according to an embodiment of the application. The control method comprises the following steps:

Step S201, when the battery pack is in a charging state, the charging power of the battery pack is obtained.

In some embodiments, the second DC terminal DC2 of the power converter 110 or the output terminal of the battery pack 130 (which is connected to the second DC terminal DC 2) is provided with a current sampling circuit and a voltage sampling circuit. In this way, the controller can obtain the charge-discharge current and the charge-discharge voltage between the second DC terminal DC2 and the battery pack 130 through the current sampling circuit and the voltage sampling circuit, so as to confirm the state of the battery pack 130 according to the charge-discharge current and the charge-discharge voltage, and obtain the charging power of the battery pack 130. The application is not limited to the specific circuits of the current sampling circuit and the voltage sampling circuit.

It will be appreciated that, as an example in which the current sampling circuit and the voltage sampling circuit are disposed at the output end of the battery pack 130, the charge/discharge current of the battery pack 130 may be positive or negative, and the positive or negative value depends on the specified current reference direction, and the specified current reference direction may be the direction of the charge current or the direction of the discharge current, and the directions of the discharge current and the charge current are opposite. For example, it is assumed that the specified current reference direction is the direction of the charging current, and when the battery pack 130 is being charged, the charging and discharging current detected at the output terminal of the battery pack 130 is a positive value, indicating that the charging and discharging current at this time is the charging current, and when the battery pack 130 is being discharged, the charging and discharging current detected at the output terminal of the battery pack 130 is a negative value, indicating that the charging and discharging current at this time is the discharging current. For another example, it is assumed that the specified current reference direction is the direction of the discharge current, and the charge/discharge current of the battery pack 130 is negative when the battery pack 130 is being charged, indicating that the charge/discharge current at this time is the charge current, and the charge/discharge current of the battery pack 130 is positive when the battery pack 130 is being discharged, indicating that the charge/discharge current at this time is the discharge current. In general, the current flowing into the battery pack 130 is defined as positive, i.e., a charging current, and the current flowing out of the battery pack 130 is defined as negative, i.e., a discharging current. The embodiments of the present application are exemplified with the charge current being positive and the discharge current being negative. Thus, when it is detected that the charge-discharge current of the battery pack 130 is a positive value, the controller may confirm that the battery pack 130 is in a charged state.

In some embodiments, the charging power of the battery pack 130 may be calculated according to the charging current and the charging voltage of the battery pack 130. In other embodiments, a power sampling circuit may be disposed at the second DC terminal DC2 of the power converter 110 or the output terminal of the battery pack 130 to obtain the charging power when the battery pack 130 is in the charging state. The application is not limited to the specific circuitry of the power sampling circuit.

In some embodiments, the battery pack 130 may be controlled to charge and discharge based on a grid-tie control loop preset in the power supply system 100. The preset grid-connected control loop may take the actual grid-connected power between the power converter 110 and the power grid 20 as a feedback value, take the target grid-connected power as a given value, and control each device in the power supply system 100 according to the power deviation between the actual grid-connected power and the target grid-connected power, so that the actual grid-connected power approaches or even maintains at the target grid-connected power. It will be appreciated that for a power converter 110 that disables the feed network, then the target grid-tie power may be set to 0, at which point the local micro-grid system 10 may achieve spontaneous use. In this way, the battery pack 130 can reduce the charging power and even discharge the electricity when the actual grid-connected power is less than 0 to reduce the probability of the power converter 110 getting electricity from the power grid 20 and reduce the electricity cost, and the battery pack 130 can reduce the discharging power and charge the electricity when the actual grid-connected power is greater than 0 to avoid feeding the power grid 20 as much as possible and store the redundant power outside the load 140 supplied by the photovoltaic power generation device 120 in the battery pack 130.

Step S202, obtaining the working mode of the MPPT circuit.

The operation modes of MPPT circuit 111 may include a maximum power tracking mode and a light rejection mode. In some embodiments, when MPPT circuit 111 is in the maximum power tracking mode, MPPT circuit 111 adjusts the photovoltaic voltage output by photovoltaic power generation device 120 based on the maximum power tracking algorithm to track the maximum power point of photovoltaic power generation device 120 when the photovoltaic voltage is adjusted to the maximum power point voltage.

In some embodiments, when MPPT circuit 111 is in the light rejection mode, MPPT circuit 111 adjusts the photovoltaic voltage according to the target output power to control the actual output power of photovoltaic power generation device 120 to approach the target output power, so that local micro-grid system 10 just meets the self-utility, at which time local micro-grid system 10 neither draws power from grid 20 nor feeds power to grid 20. Wherein the target output power may be a target value of the output power of the photovoltaic power generation apparatus 120. And the target output power may be derived from the actual output power of the photovoltaic power plant 120 and the grid power. Where the grid power represents the power that the local micro grid system 10 feeds into the grid 20, i.e. the power that the AC end AC of the power converter 110 feeds into the grid 20. For example, in some embodiments, the difference of the actual output power of the photovoltaic power plant 120 minus the grid power may be taken as the target output power, and the difference may be greater than or equal to 0.

In some embodiments, a grid monitoring module (not shown) may be disposed between the common connection point (Point of Common Coupling, PCC) of the output of the power converter 110 and the consumer (including the load 140 and the target device 150) and the grid 20. The grid monitoring module is used to monitor the actual grid-connected power between the local micro-grid system 10 and the grid 20. In this way, the controller may obtain the actual grid-connected power between the local micro-grid system 10 and the grid 20 by communicating with the grid monitoring module. The actual grid-connected power may be a positive value or a negative value, and the positive value or the negative value depends on a designated power reference direction, and the designated power reference direction may be a direction in which the power converter 110 feeds the power grid 20 or a direction in which power on the power grid 20 flows to the power converter 110, and the two directions are opposite. Generally, the power reference direction is designated as the direction in which the power converter 110 feeds the power grid 20. In this manner, the actual grid-tie power detected by the grid monitoring module is positive when the power converter 110 is feeding the grid 20, and negative when the power converter 110 is taking power from the grid 20 to power the load 140. The embodiments of the present application are exemplified with the actual grid-tie power fed to the grid 20 by the power converter 110 being positive and the actual grid-tie power drawn from the grid 20 by the power converter 110 being negative. That is, when an actual grid-tied power greater than 0 is detected, then the actual grid-tied power may be used as the grid-feed power, at which point the local micro-grid system 10 feeds the grid 20. In other embodiments, the power grid monitoring module may be other devices with a power harvesting function, which is not limited in the present application.

Understandably, MPPT circuitry 111 may determine the corresponding operating mode based on the actual grid-tie power detected by the grid monitoring module. For example, in some embodiments, when the actual grid-connected power is less than 0, it is indicated that the output power of the photovoltaic power generation device 120 cannot meet the required power of the load 140 and/or the target device 150, and the MPPT circuit 111 is in the maximum power tracking mode to increase the output power of the photovoltaic power generation device 120 as much as possible. When the actual grid-connected power is greater than or equal to 0, it indicates that the output power of the photovoltaic power generation device 120 can meet the required power of the load 140 and/or the target device 150, so that the charging power of the battery pack 130 can be increased or the discharging power of the battery pack 130 can be reduced on the premise that the power converter 110 is prohibited from feeding the power grid 20. When the charging power of the battery pack 130 reaches the upper limit value of the charging power, the MPPT circuit 111 may be controlled to be in the light-discarding mode, so that the local micro-grid system 10 just meets the spontaneous use and stops feeding the power grid 20.

In some embodiments, the first identifier may be stored in a memory space corresponding to the memory of the power converter 110. The first identifier may be set when the operation mode of MPPT circuit 111 is the maximum power tracking mode, and may be reset when the operation mode of MPPT circuit 111 is the light rejection mode. As such, the controller may communicate with power converter 110 to request a first identifier of power converter 110, such that the controller may determine an operating mode of MPPT circuitry 111 based on the obtained first identifier.

Step S203, when the charging power is larger than the starting power of the target equipment or the MPPT circuit is in the light discarding mode, starting and operating the target equipment.

Wherein the reject mode is used to indicate that MPPT circuitry 111 is operating at a non-maximum power point. The boot power may be the power required during the boot process of the target device 150. Because the device needs to overcome the influence of friction force, rotational inertia and other factors in a static state in the starting process, the starting power is usually larger than or equal to the operating power of the device in normal operation.

In some embodiments, when the charging power is greater than the starting power of the target device 150, it indicates that the output power of the photovoltaic power generation device 120 charges the battery pack 130 with a redundant power in addition to the required power of the load 140, and since the redundant power is greater than the starting power of the target device 150, it indicates that the redundant power can at least ensure the starting and normal operation of the target device 150. Thus, if the target device 150 is started and operated at this time, the actual grid-connected power may be reduced so that the actual grid-connected power is less than 0, and thus the battery pack 130 will reduce the charging power to maintain the self-use of the local micro-grid system 10, that is, at least part of the charging power is used to start the target device 150 and is subsequently used to satisfy the operation power required by the target device 150 when it is operating normally. Obviously, the number of times that the target device 150 is frequently switched between startup and shutdown due to insufficient power can be significantly reduced compared to the manner in which the target device 150 is attempted to be turned on in the related art.

In other embodiments, when MPPT circuit 111 is in the light rejection mode, it is illustrated that there is a possibility that the output power of photovoltaic power generation device 120 continues to increase at this time, and battery pack 130 has been fully charged (e.g., the SOC of battery pack 130 reaches 100%) or the charging power of battery pack 130 has reached the upper charging power limit. Thus, if the target device 150 is started and operated at this time, the actual grid-connected power may be reduced, such that the actual grid-connected power is smaller than 0, and thus the MPPT circuit 111 switches from the light rejection mode to the maximum power tracking mode to obtain a larger output power of the photovoltaic power generation device 120, and the battery pack 130 may also reduce the charging power and even turn to discharge. In this way, the photovoltaic power generation device 120 and/or the battery pack 130 may power the target device 150 in addition to meeting the power requirements of the load 140. In this case, the number of times that the target device 150 is frequently switched between startup and shutdown due to insufficient power can be significantly reduced as compared to the related art method of attempting to turn on the target device 150.

In summary, in the power supply system control method provided by the present application, the charging power of the battery pack 130 in the charging state and the working mode of the MPPT circuit 111 are obtained first, and then the target device 150 is started and operated when the charging power is greater than the starting power of the target device 150 or the MPPT circuit 111 is in the light-rejecting mode. When the charging power is greater than the starting power of the target device 150, it indicates that the photovoltaic power generation device 120 has a redundant power in addition to the load 140, and the redundant power is greater than the starting power of the target device 150, and because the operating power of the target device 150 is generally less than or equal to the starting power, the redundant power can satisfy the starting power and the operating power of the target device 150. When MPPT circuit 111 is in the light rejection mode, it is indicated that there is still a possibility that the output power of photovoltaic power generation device 120 may be increased, and that battery pack 130 may be fully charged or the charging power of battery pack 130 may reach the charging power upper limit value, at which point photovoltaic power generation device 120 and/or battery pack 130 may power target device 150 in addition to meeting the power requirements of load 140. In this way, when the charging power is greater than the starting power of the target device 150, or the MPPT circuit 111 is in the light-rejecting mode, the target device 150 is started and operated, and compared with the manner of attempting to start the target device 150 in the related art, it is obviously more likely to maintain the normal operation of the target device 150 for a period of time, so as to reduce the number of times that the target device 150 is frequently switched between starting and stopping due to insufficient power, improve the operation stability of the target device 150, and improve the electrical efficiency of the power supply system 100 under the premise of prohibiting the power supply to the power grid 20.

In some embodiments, the target device 150 may be an intelligent home such as an air conditioner, a water heater, a sweeping robot, or an intelligent mower, so, based on the above power supply system control method, the power supply system 100 is controlled, redundant power in the local micro-grid system 10 can be fully utilized, the target device 150 can stably run for a period of time, and operations of adjusting indoor temperature, heating cold water in advance and storing in a water storage tank, sweeping sanitation, and managing a courtyard are performed to improve the home environment, thereby improving the power consumption efficiency of the power supply system 100, improving the user experience and reducing the power consumption cost of the user.

Referring to fig. 3, in some embodiments, when the power utilization priority of the target device 150 is higher than the power utilization priority of the battery pack 130, the starting and running of the target device in step S203 includes the following sub-steps:

step S301, starting the target equipment according to the starting power of the target equipment.

In step S301, a control instruction may be sent by the controller to the power converter 110 to control the power converter 110 to start the target device according to the start power of the target device.

In some embodiments, the power converter 110 or a controller of the power supply system 100 may communicate with the target device 150 to obtain the starting power. Then, after receiving the control instruction, the controller controls the power converter 110 to output corresponding power through the second device connection terminal CON2 to start the target device 150. The communication manner between the power converter 110 or the controller of the power supply system 100 and the target device 150 may be wireless communication or wired communication.

In other embodiments, the start-up power of the target device 150 may also be a preset value. For example, the start-up power may also be preset in a memory (not shown) of the power supply system 100, so that the controller may directly obtain the preset start-up power and send a control command including the start-up power to the power converter 110 to start up the target device 150. Or the controller of the power supply system 100 may obtain a preset start power from a host computer, such as a physical server, a cloud server, or a user terminal installed with an APP (Application), and send a control command including the start power to the power converter 110 to start the target device 150.

Step S302, after the target equipment is started, the target equipment is controlled to operate according to preset working power, and the preset working power is smaller than or equal to the starting power.

In step S302, when the power usage priority of the target device 150 is higher than that of the battery pack 130, the target device 150 may be controlled to operate at the preset operating power after the target device 150 is started.

If the output power of the photovoltaic power generation device 120 is sufficient to support the load 140 and the target device 150, the output power of the photovoltaic power generation device 120 may be used to power the load 140 and the target device 150, and when there is remaining power, the remaining power may be used to charge the battery pack 130. If the output power of the photovoltaic power generation device 120 cannot support the operation of the load 140 and the target device 150, the charge/discharge power of the battery pack 130 may be adjusted to preferentially meet the power requirement of the target device 150, i.e. the battery pack 130 is controlled to discharge so that the target device 150 operates according to the preset operating power.

The preset operating power may be a power required for the target device 150 to operate. The preset operating power may be a variable value, and the preset operating power may be adjusted according to different operating conditions of the target device 150. In some embodiments, after the target device 150 is started, the power converter 110 may obtain the preset operating power through communication between the power converter 110 and the target device 150, and the power converter 110 adjusts the actual output power of the second device connection terminal CON2 according to the preset operating power to meet the requirement of the target device 150, so as to control the target device 150 to operate according to the preset operating power.

In summary, by executing steps S301 to S302, when the power utilization priority of the target device 150 is higher than the power utilization priority of the battery pack 130, the redundant power of the power supply system 100 and/or the discharge power of the battery pack 130 may be used to supply power to the target device 150, so that the target device 150 operates stably.

In some embodiments, when the power usage priority of the target device 150 is higher than the power usage priority of the battery pack 130, the control method further includes:

and closing the target equipment when the electric quantity of the battery pack is lower than a preset electric quantity threshold value.

The preset power threshold is used to represent a power lower limit value of the battery pack 130. In some embodiments, the preset Charge threshold may be a preset State of Charge (SOC) value. It will be appreciated that the load 140 may also be powered in situations where the light intensity is poor, i.e., when the output power of the photovoltaic power plant 120 is low, due to the energy stored by the battery pack 130. In order to ensure the usability of the battery pack 130, a preset power threshold may be set in this embodiment, so that when the power of the battery pack 130 is lower than the preset power threshold, the target device 150 is turned off, so as to avoid the complete exhaustion of the power of the battery pack 130, so that the battery pack 130 can reserve a part of the power for power consumption in other situations.

In some embodiments, the preset power threshold may be a preset value. The preset power threshold may be set by a user on a user terminal installed with an APP (Application). For example, assuming that the user sets a preset power threshold of 40% through the user terminal, the controller may turn off the target device 150 when the power of the battery pack 130 is lower than 40%.

In other embodiments, the preset charge threshold may also be a variable value. And the preset power threshold may be adjusted according to the use State Of the battery pack 130, such as a State Of Health (SOH), a battery use period, a battery temperature, etc.

In some embodiments, the controller or power converter 110 of the power supply system 100 may communicate with the battery pack 130 to obtain the charge of the battery pack 130.

In some embodiments, the controller may directly control the second device connection CON2 to stop outputting power to turn off the target device 150. In other embodiments, the controller or power converter 110 may communicate with the target device 150 such that the target device 150 is actively powered down to shut down the target device 150. The application is not limited to the specific manner in which the target device 150 is turned off.

Referring to fig. 4, in some embodiments, when the power utilization priority of the target device 150 is lower than the power utilization priority of the battery pack 130, the starting and operating of the target device in step S203 includes the following sub-steps:

step S401, starting the target equipment according to the starting power of the target equipment.

It is to be understood that the specific execution of step S401 is substantially the same as that of step S301, and will not be described herein.

Step S402, after the target equipment is started, the running power of the target equipment is reduced until the charging power of the battery pack reaches the corresponding upper limit value of the charging power, or the running power of the target equipment is reduced to the preset lower limit value of the charging power.

In step S402, the preset power lower limit value is the minimum power required for the operation of the target device 150. When the operation power of the target device 150 decreases to be less than the preset power lower limit value, the target device 150 stops operating.

As can be appreciated, when the redundant power supplied by the photovoltaic power generation device 120 to the load 140 is insufficient to simultaneously support full power charging of the start-up target device 150 and the battery pack 130, i.e., charging at the upper limit of the charging power, the start-up target device 150 may encroach on the charging power of the battery pack 130. In this embodiment, since the battery pack 130 has a higher priority, the operating power of the target device 150 is gradually reduced after the target device 150 is started, and the battery pack 130 is charged with the yielding power until the battery pack 130 is fully charged. However, the target device 150 has the lowest limitation of the operation power, so when the operation power of the target device 150 drops to the preset lower power limit value, the operation power of the target device 150 is not continuously reduced, so that the target device 150 maintains the operation state at the lowest operation power, and the number of times of switching between the start-up and the stop of the target device 150 is reduced.

When the charging power of the battery pack 130 reaches the charging power upper limit value, the charging power of the battery pack 130 cannot be increased any more, and thus, it is possible to suspend the reduction of the operation power of the target device 150 and maintain the operation of the target device 150 at the operation power at which the charging power reaches the charging power upper limit value or at which the battery pack 130 is fully charged. It is understood that when the battery pack 130 is fully charged, it means that the charging power of the battery pack 130 reaches the upper limit value of the charging power, for example, 0, and at this time, it is also necessary to stop reducing the operation power of the target device 150.

In some embodiments, the controller or power converter 110 of the power supply system 100 may communicate with the battery pack 130 to obtain the charging power of the battery pack 130. In other embodiments, a power sampling circuit may also be disposed at the second DC end DC2 of the power converter 110 to obtain the charging power of the battery pack 130.

In summary, in steps S401 to S402 provided in this embodiment, when the power consumption priority of the target device 150 is lower than the power consumption priority of the battery pack 130, after the target device 150 is started, the operation power of the target device 150 is reduced to ensure that the target device 150 maintains operation at least with the preset lower power limit value, so as to reduce the frequency of switching between startup and shutdown of the target device 150 due to insufficient power.

In some embodiments, when the power usage priority of the target device 150 is lower than the power usage priority of the battery pack 130, the control method further comprises:

And closing the target equipment when the operation time of the target equipment at the preset power lower limit value reaches the preset time.

Understandably, when the target device 150 is operating at the preset power lower limit value, it means that the output power of the photovoltaic power generation device 120 is insufficient to support both full power charging of the battery pack 130 and normal operation of the target device 150. However, since the output power of the photovoltaic power generation device 120 has a certain fluctuation, the preset duration may be set in order to avoid frequent start-up and stop of the target device 150 and to ensure that the target device 150 can operate for a period of time after being started up.

When the duration of the operation of the target device 150 with the preset lower power limit value reaches the preset duration, the output power of the photovoltaic power generation device 120 is insufficient, and the target device 150 can be directly turned off, so that the power for maintaining the operation of the target device 150 is converted into the charging power of the battery pack 130, and the electric energy utilization efficiency of the power supply system 100 is improved. It will be appreciated that the application is not limited to a specific length of time for the preset length of time.

And closing the target equipment when the charging power of the battery pack is smaller than a preset power threshold value, wherein the preset power threshold value is smaller than the difference between the upper limit value of the charging power and the lower limit value of the preset power.

Since the redundant power is used to support the battery pack 130 for charging and the target device 150 is operated when the power priority of the target device 150 is lower than the power priority of the battery pack 130, and the redundant power is preferentially used to ensure that the battery pack 130 is charged with the upper limit value of the charging power. Thus, when the charging power of the battery pack 130 is smaller than the difference between the upper limit value of the charging power and the lower limit value of the preset power, it is indicated that the redundant power is smaller than the upper limit value of the charging power at this time. At this time, the target device 150 may be directly turned off, and the charging of the battery pack 130 may be preferentially ensured.

In other embodiments, the target device 150 may be turned off when it is detected that the state in which the charging power of the battery pack remains less than the preset power threshold value reaches the preset time length. In this way, the output power of the photovoltaic power generation device 120 can be waited for a preset period of time to reduce the number of frequent start-up and shut-down times of the target device 150.

It will be appreciated that when target device 150 includes a plurality of powered devices, powering down the target device in the above embodiments may include determining a power utilization priority of each powered device in target device 150 and powering down the powered devices in order from low to high power utilization priority.

In some embodiments, prior to starting and running the target device, the control method further comprises:

and determining the electricity utilization priority relation between the battery pack and the target equipment according to the electric quantity of the battery pack.

It will be appreciated that the energy stored by the battery pack 130 may supplement the power supply to the load 140 when the output power of the photovoltaic power generation device 120 is insufficient to meet the power demand of the load 140, and the battery pack 130 is not overdischarged, so that the power of the battery pack 130 is maintained at least at a minimum power value in terms of the power cost of the user and the safety of the battery pack 130. Thus, the preset switching threshold value can be determined according to the lowest electric quantity value. And the determining the electricity priority relationship between the battery pack 130 and the target device 150 according to the electric quantity of the battery pack 130 may be determining the electricity priority relationship between the battery pack 130 and the target device 150 according to the magnitude relationship between the electric quantity of the battery pack 130 and the preset switching threshold.

For example, in some embodiments, determining a power usage priority relationship between a battery pack and a target device based on a power level of the battery pack includes:

when the electric quantity of the battery pack is larger than or equal to a preset switching threshold value, determining that the electricity utilization priority of the target equipment is higher than that of the battery pack;

and when the electric quantity of the battery pack is smaller than a preset switching threshold value, determining that the electricity utilization priority of the target equipment is lower than that of the battery pack.

The preset switching threshold is used to represent a power threshold when the power utilization priority relationship is switched between the battery pack 130 and the target device 150. In some embodiments, the preset switching threshold may be a preset SOC value.

The preset switching threshold may be set by a user through a user terminal in which the APP is installed, or the preset switching threshold may be determined based on historical data of the power supply system 100. The application does not limit the determination mode of the preset switching threshold value. For example, the preset switching threshold may be set to 10%,20%,40%, or the like.

It can be appreciated that, when the power of the battery pack 130 is greater than or equal to the preset switching threshold, determining that the power utilization priority of the target device 150 is higher than the power utilization priority of the battery pack 130 may enable the photovoltaic power generation device 120 to preferentially supply power to the target device 150 when the redundant power outside the load 140 is satisfied, so as to improve the energy utilization efficiency of the power supply system 100. When the electric quantity of the battery pack 130 is smaller than the preset switching threshold, determining that the electric priority of the target device 150 is lower than the electric priority of the battery pack 130 can enable the redundant power of the photovoltaic power generation device 120 beyond the load 140 to preferentially meet the charging of the battery pack 130 until the charging power of the battery pack 130 reaches the charging power upper limit value, so as to reduce the electric cost of the power supply system 100 as much as possible and prevent the battery pack 130 from overdischarging.

In other embodiments, the electricity priority relationship between the battery pack and the target device may also be a preset electricity priority relationship, for example, the electricity priority of the battery pack 130 is always greater than the electricity priority of the target device 150, or the electricity priority of the target device 150 is always greater than the electricity priority of the battery pack 130.

In some embodiments, a user may set and alter the power usage priority relationship between the battery pack 130 and the target device 150 through a user terminal installed with a corresponding control APP.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating a change of a theoretical maximum output power of the photovoltaic power generation device 120, an actual output power of the photovoltaic power generation device 120, a charging power of the battery pack 130, and an operation power of the target device 150 with time when the power supply system control method provided by the present application is implemented. Wherein the curve S501 is used to represent a theoretical maximum output power curve of the photovoltaic power generation apparatus 120, the curve S502 is used to represent an actual output power curve of the photovoltaic power generation apparatus 120, the curve S503 is used to represent a charging power curve of the battery pack 130, and the curve S504 is used to represent an operation power curve of the target apparatus 150.

As shown in fig. 5, at time T0, it is detected that the charging power of the battery pack 130 is greater than the start-up power Pa of the target device 150, and the target device 150 is turned on. At this time, MPPT circuit 111 is in the light rejection mode, i.e., MPPT circuit 111 is not operating at the maximum power point.

At time T1, target device 150 completes startup, at which point MPPT circuitry 111 has not yet performed maximum power point tracking. At this time, assuming that the power consumption priority of the target device 150 is lower than the power consumption priority of the battery pack 130 and the charging power of the battery pack 130 has not reached the charging power upper limit value, the target device 150 may start to give way power to charge the battery pack 130.

In the period of T1 to T2, the operating power of the target device 150 gradually decreases from the start power Pa to the preset power lower limit value Pb, and the charging power of the battery pack 130 gradually increases but does not reach the charging power upper limit value.

In the period from T2 to T3, the MPPT circuit 111 has not performed the maximum power point tracking, and the operation power of the target device 150 is maintained at the preset power lower limit Pb, and the battery pack 130 is charged with the power for continuous yielding.

At time T3, MPPT circuit 111 starts to track the maximum power point until time T5 tracks the maximum power point, during which the actual output power of photovoltaic power plant 120 gradually increases. From time T3, the charging power of the battery pack 130 increases with an increase in the actual output power of the photovoltaic power generation device 120, and reaches the charging power upper limit value at time T4.

At time T4, the charging power of the battery pack 130 reaches the charging power upper limit value, the actual output power of the photovoltaic power generation apparatus 120 also rises, and the operation power of the target apparatus 150 rises with the rise of the actual output power of the photovoltaic power generation apparatus 120.

At time T5, the maximum power of the photovoltaic power plant 120 begins to drop, with the actual output power of the photovoltaic power plant 120 decreasing. At this time, the charging power of the battery pack 130 is also maintained at the charging power upper limit value, and the operation power of the target device 150 decreases as the actual output power of the photovoltaic power generation device 120 decreases.

At time T6, the operating power of the target device 150 reaches the preset power lower limit Pb, stopping the drop. The charging power of the battery pack 130 starts to decrease with a decrease in the actual output power of the photovoltaic power generation apparatus 120.

At time T7, the charging power of the battery pack 130 is less than the charging power upper limit minus the minimum power of the target device 150, and the target device 150 is turned off. And at time T7, the actual output power of the photovoltaic power generation apparatus 120 is less than the theoretical maximum output power at the corresponding time due to the shutdown of the target apparatus 150, the photovoltaic power generation apparatus 120 being deviated from the maximum power point.

In the period of T7 to T8, as the charging power of the battery pack 130 rises, the MPPT circuit 111 again performs maximum power point tracking, and re-tracks to the maximum power point at time T8.

Referring to fig. 6, the present application further provides a power supply system 100, which includes a photovoltaic power generation device 120, a battery pack 130, and a power converter 110. The first DC terminal DC1 of the power converter 110 is for connection to the photovoltaic power generation device 120, and the second DC terminal DC2 of the power converter 110 is for connection to the battery pack 130. The AC side AC of the power converter 110 is used for connection to the grid 20. The power converter 110 is also configured to connect to a load 140 and a target device 150. The power converter 110 includes an MPPT circuit 111 to track the maximum power point of the photovoltaic power generation device 120. The power supply system 100 further comprises a controller 160, the controller 160 being configured to perform the power supply system control method as described in any of the embodiments above.

It will be appreciated that in fig. 6, the solid line represents a wire for transmitting power, and the broken line connected to the controller 160 is used to represent a communication line.

Referring to fig. 7, the present application further provides an electronic device 200, including a controller 160 and a memory 210. The memory 210 is used to store a program, instructions or codes for executing the discharge control method of the above dc converter. The controller 160 is used to execute programs, instructions or code stored in the memory 210. The program, instructions or code stored in the memory 210 may perform some or all of the steps of the power supply system control method in any of the embodiments described above.

An embodiment of the present application further provides a control device 300, which is applied to the power supply system 100 or an electronic device integrated with the power supply system 100. Fig. 8 schematically shows a block diagram of a control device 300 according to an embodiment of the present application. As shown in fig. 8, the control device 300 includes:

the first obtaining module 310 is configured to obtain the charging power of the battery pack 130 when the battery pack 130 is in a charging state.

Second obtaining module 320 is configured to obtain an operation mode of MPPT circuit 111.

The starting module 330 is configured to start and operate the target device 150 when the charging power is greater than the starting power of the target device 150, or when the MPPT circuit 111 is in the light rejection mode, where the light rejection mode is used to instruct the MPPT circuit 111 to operate at a non-maximum power point.

Specific details of the implementation of the power supply system control method by the control device 300 provided in the embodiment of the present application have been described in detail in the corresponding embodiment of the power supply system control method, and are not described herein again.

Referring to fig. 9, the present application further provides a computer readable storage medium 400, on which a computer program 410 is stored, which when executed by the controller 160, causes the controller 160 to implement the power supply system control method according to any of the above embodiments. The computer readable medium may take the form of a portable compact disc read only memory (CD-ROM) and include program code that can be run on a terminal device, such as a personal computer. However, the program product of the present application is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

The program product described above may take the form of any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of a readable storage medium include an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

The computer readable signal medium may include a data signal propagated in baseband or as part of a carrier wave with readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server. In the case of remote computing devices, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., connected via the Internet using an Internet service provider).

Furthermore, the above-described drawings are only schematic illustrations of processes included in the method according to the exemplary embodiment of the present invention, and are not intended to be limiting. It will be readily appreciated that the processes shown in the above figures do not indicate or limit the temporal order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, among a plurality of modules.

The present application is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present application, and these modifications and substitutions are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1. The power supply system control method is applied to a controller in a power supply system and is characterized in that the power supply system comprises photovoltaic power generation equipment, a battery pack and a power converter, a first direct-current end of the power converter is used for being connected with the photovoltaic power generation equipment, a second direct-current end of the power converter is used for being connected with the battery pack, an alternating-current end of the power converter is used for being connected with a power grid, the power converter is further used for being connected with target equipment, the power converter comprises an MPPT circuit for tracking the maximum power point of the photovoltaic power generation equipment, and the method comprises the following steps:

acquiring the charging power of the battery pack when the battery pack is in a charging state;

Acquiring a working mode of the MPPT circuit;

And when the charging power is larger than the starting power of the target equipment or the MPPT circuit is in a light discarding mode, starting and operating the target equipment, wherein the light discarding mode is used for indicating that the MPPT circuit operates at a non-maximum power point.

2. The method of claim 1, wherein the enabling and operating the target device when the power usage priority of the target device is higher than the power usage priority of the battery pack comprises:

Starting the target equipment according to the starting power of the target equipment;

and after the target equipment is started, controlling the target equipment to operate according to preset working power, wherein the preset working power is smaller than or equal to the starting power.

3. The method according to claim 2, wherein the method further comprises:

4. The method of claim 1, wherein the enabling and operating the target device when the power usage priority of the target device is lower than the power usage priority of the battery pack comprises:

And after the target equipment is started, reducing the running power of the target equipment until the charging power of the battery pack reaches the corresponding upper limit value of the charging power, or the running power of the target equipment is reduced to the lower limit value of the preset power.

5. The method according to claim 4, wherein the method further comprises:

and closing the target equipment when the operation time of the target equipment with the preset power lower limit value reaches the preset time.

6. The method according to claim 4, wherein the method further comprises:

7. The method according to any one of claims 2 to 6, wherein prior to said starting and running the target device, the method further comprises:

8. The method of claim 7, wherein the determining the power usage priority relationship between the battery pack and the target device based on the power of the battery pack comprises:

And when the electric quantity of the battery pack is smaller than the preset switching threshold value, determining that the electricity utilization priority of the target equipment is lower than that of the battery pack.

9. A power supply system, characterized in that the power supply system comprises a photovoltaic power generation device, a battery pack, and a power converter, a first direct current end of the power converter is used for being connected with the photovoltaic power generation device, a second direct current end of the power converter is used for being connected with the battery pack, an alternating current end of the power converter is used for being connected with a power grid, the power converter is further used for being connected with a target device, the power converter comprises an MPPT circuit for carrying out maximum power point tracking on the photovoltaic power generation device, and the power supply system further comprises a controller for executing the power supply system control method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a controller, causes the controller to implement the power supply system control method according to any one of claims 1 to 8.