WO2018153233A1 - Concentrated solar power generation system and power generation method - Google Patents

Abstract

A concentrated solar power generation system and a power generation method. The concentrated solar power generation system comprises a concentrated solar power generation receiving tower (1), a concentrating photovoltaic receiving device (2), a plurality of heliostats (3) and a solar irradiance acquisition module. The acquisition module is used to acquire actual solar irradiance. The heliostat (3) comprises: a tracker support; a reflector fixedly arranged on the tracker support; a solar irradiance determination module connected to and communicating with the solar irradiance acquisition module, and used to determine whether the actual solar irradiance exceeds a preset solar irradiance; and a controller, connected to the tracker support, connected to and communicating with the solar irradiance determination module, and used to adjust, according to a determination result of the solar irradiance determination module, an angle of the tracker support. The concentrated solar power generation system and the power generation method can be used to ensure power generation efficiency of a concentrated solar power station, effectively increasing a utilization rate of the heliostats (3) in the concentrated solar power station.

Description

Concentrated light thermal power generation system and power generation method Technical field

The invention relates to the field of concentrating power generation technology, in particular to a concentrating photothermal power generation system and a power generation method.

Background technique

The existing large-scale tower-type concentrating solar thermal power station, due to changes in sunshine resources, can reach 1000W/m^2 in clear skies and only 400-600W/m^2 in cloudy days. In view of the changes in sunshine, in order to ensure that large-scale tower-type concentrating solar thermal power stations can work efficiently in the presence of sunshine, at the beginning of the design and construction of the power station, the concentrating light-receiving tower with three times or more is usually able to withstand Heliostats to cope with the low-irradiation environment, the concentrating light-receiving tower can still maintain high light-to-heat conversion efficiency. However, in a high-irradiation environment, if all of the configured heliostats are operated, the concentrating-light-receiving tower will burn out beyond its load carrying capacity. Under normal circumstances, the working temperature of the concentrating light receiving tower is relatively high (up to 800-1000 ° C), and the annual power generation efficiency can reach 17% -20%. Usually, in a high-irradiation environment, part of the heliostats will be kept inoperative to ensure efficient operation of the concentrating light-receiving tower. Therefore, in a high-irradiation environment, the heliostat that does not work has a great waste of resources.

Accordingly, the Applicant is directed to providing a novel concentrating solar thermal power generation system and a power generation method.

Summary of the invention

The object of the present invention is to provide a concentrating photothermal power generation system and a power generation method, which can effectively improve the utilization rate of heliostats in a concentrating solar thermal power station under the premise of ensuring the power generation efficiency of the concentrating solar thermal power station.

In order to solve the above technical problem, the present invention provides a concentrating photothermal power generation system, comprising a concentrating photothermal receiving tower and a plurality of heliostats, further comprising: a concentrating photovoltaic receiving device; a sunshine obtaining module, the obtaining module For determining the actual sunshine value; the heliostat includes: a tracker bracket; a mirror fixedly disposed on the tracker bracket; and a sunshine judgment module, which is in communication with the sunshine acquisition module, configured to determine the actual Whether the sunshine value is greater than the preset sunshine value; the controller is connected to the tracker bracket and is in communication with the sunshine determination module, and is configured to adjust an angle of the tracker bracket according to the determination result of the sunshine determination module.

If the judgment result of the sunshine judgment module is yes, the controller adjusts an angle of the tracker bracket such that an angle of the mirror corresponds to the concentrating photovoltaic receiving device;

If the judgment result of the sunshine judgment module is no, the controller adjusts an angle of the tracker bracket such that an angle of the mirror corresponds to the light collection tower.

Preferably, the concentrating solar thermal power generation system further includes: a wind speed acquiring module, configured to acquire an actual wind speed; and a wind speed determining module, configured to communicate with the wind speed acquiring module, configured to determine whether the actual wind speed obtained by the wind speed acquiring module is The heliostat further includes an angle fine adjustment device, and the angle fine adjustment device is in communication with the wind speed determination module, and is configured to adjust a position of the tracker bracket according to the determination result of the wind speed determination module.

Preferably, the angle fine adjustment device comprises: an angle sensor connected to the tracker bracket for acquiring an attitude trajectory of the tracker bracket; and a PID controller respectively connected to the angle sensor and the controller for use An angle adjustment command is obtained according to the attitude trajectory and sent to the controller.

Preferably, the concentrating photovoltaic receiving device is the same height as the concentrating light receiving tower and has a spacing therebetween.

Preferably, the concentrating photovoltaic receiving device is distributed around a top end of the concentrating light receiving tower, and the concentrating photovoltaic receiving device is symmetrically distributed around a top end of the concentrating photothermal receiving tower; or The concentrating photovoltaic receiving device is disposed side by side with the concentrating heat receiving tower.

Preferably, the concentrating photovoltaic receiving device comprises an array of photoelectric conversion devices and a heat dissipating device, the photoelectric conversion device being a multi-junction III-V cell sheet, the heat dissipating device comprising an active heat sink and/or a passive heat sink; And/or; the mirror is a plane mirror or a curved mirror; and/or; the mirror is hung on the tracker bracket by a hook; and/or; the tracker bracket is a dual-axis tracker support.

Preferably, a plurality of the heliostats are arranged in a fan array or a circumference in a center of the concentrating heat receiving tower, and each heliostat can adjust its angle to the concentrating heat receiving tower. Corresponding angles; and/or; the concentrating photovoltaic receiving device is connected to the grid through an inverter or connected to ground energy storage equipment for storage.

The invention also discloses a concentrating photothermal power generation method, comprising the steps of:

S10: obtaining an actual sunshine value;

S20: determining whether the actual sunshine value is greater than a preset sunshine value;

S30: if the actual sunshine value is greater than a preset sunshine value, adjusting an angle of the heliostat to adjust the heliostat to an angle corresponding to the concentrating photovoltaic receiving device;

S40: If the actual sunshine value is not greater than the preset sunshine value, adjust the angle of the heliostat to adjust the heliostat to an angle corresponding to the concentrating heat receiving tower.

Preferably, the concentrating photothermal power generation method further comprises the steps of:

S50: obtaining wind speed;

S60: determining whether the wind speed is greater than a preset wind speed value;

S70: if the wind speed is greater than a preset wind speed value, controlling the heliostat to perform angle fine adjustment, so that the heliostat is maintained at an angle corresponding to the concentrating photovoltaic receiving device or with the concentrating light Receive the angle corresponding to the tower.

Preferably, the number of the heliostats is plural, and each of the heliostats is provided with one predetermined sunshine value, so that the power generation efficiency of the concentrating light-receiving tower is maintained at a preset power generation efficiency. When the actual sunshine value is 900-1000 W/m^2, 50-60% of the heliostat angle corresponds to the concentrating photovoltaic receiving device; the actual sunshine value is 700-900 W/m^ 2, 20-40% of the heliostat angle corresponds to the concentrating photovoltaic receiving device; when the actual sunshine value is 500-700 W/m^2, 10-20% of the heliostat The angle corresponds to the concentrating photovoltaic receiving device; when the actual sunshine value is less than 500 W/m^2, 100% of the heliostats are projected onto the concentrating light receiving tower.

The concentrating solar thermal power generation system and the power generation method of the present invention can achieve at least one of the following advantageous effects.

1. Each heliostat in the concentrating solar thermal power generation system of the present invention can obtain the actual sunshine value through the sunshine acquisition module, and the sunshine judgment module further determines whether the actual sunshine value is greater than the preset sunshine value, and the controller determines the module according to the sunshine. The result of the judgment is to control the rotation of the tracker bracket, so that when the illumination is strong, most of the heliostats reflect the sunlight to the concentrating photovoltaic receiving device, so that all the heliostats reflect the sunlight to the concentrated light. Receiving the tower, causing it to be damaged beyond the load. When the illumination is weak, most of the heliostats reflect the sunlight to the concentrating light-receiving tower, thereby ensuring that the power generation efficiency is maintained when the illumination is weak. Therefore, the concentrating photothermal power generation system of the present invention can fully utilize the heliostat regardless of the light intensity, and can also ensure that the concentrating light-receiving tower always maintains a high power generation efficiency.

2. The concentrating solar thermal power generation system of the present invention can also obtain the fine adjustment command of the tracker bracket through the wind speed acquisition module, the wind speed determination module and the heliostat fine adjustment device, so that the heliostat can always be aligned under high wind conditions. The concentrating light receiving tower or the concentrating photovoltaic receiving device ensures the power generation efficiency of the power station, and further enables the concentrating solar thermal power generation system to be applied to an area where the light is sufficient but the sand is large.

DRAWINGS

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

1 is a schematic structural view of a specific embodiment of a concentrating photothermal power generation system of the present invention;

Fig. 2 is a schematic view showing the structure of another embodiment of the concentrating photovoltaic power generation system of the present invention.

Description of the reference numerals:

Concentrating light receiving tower 1, concentrating photovoltaic receiving device 2, heliostat 3, and sun 4.

detailed description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

Embodiment 1

Embodiment 1 discloses a concentrating photothermal power generation system including a concentrating photothermal receiving tower 1 and a plurality of heliostats 3, further comprising: a concentrating photovoltaic receiving device 2; a sunshine obtaining module, and an acquiring module for acquiring the sun The actual sunshine value of 4. The heliostat 3 comprises: a tracker bracket; a mirror fixedly disposed on the tracker bracket; the sunshine judging module is in communication with the sunshine acquisition module, and is configured to determine whether the actual sunshine value is greater than a preset sunshine value; the controller, The utility model is connected to the tracker bracket and is in communication with the sunshine judgment module, and is configured to adjust the angle of the tracker bracket according to the judgment result of the sunshine judgment module.

If the judgment result of the sunshine judging module is yes, the controller adjusts the angle of the tracker bracket so that the angle of the mirror corresponds to the concentrating photovoltaic receiving device;

If the judgment result of the sunshine judging module is no, the controller adjusts the angle of the tracker bracket so that the angle of the mirror corresponds to the concentrating light receiving tower.

After the controller adjusts the angle of the heliostat, the power generation efficiency of the concentrating light receiving tower can reach the preset efficiency. The preset efficiency here refers to the desired preset efficiency that the power station can achieve at the concentrating light receiving tower. The specific value can be set according to actual needs.

Specifically, the concentrating solar thermal power generation system further includes: a wind speed obtaining module, configured to obtain an actual wind speed; and a wind speed determining module, configured to communicate with the wind speed acquiring module, configured to determine whether the actual wind speed obtained by the wind speed acquiring module is greater than a preset wind speed value. The heliostat also includes an angle fine adjustment device, and the angle fine adjustment device is in communication with the wind speed determination module, and is configured to adjust the position of the tracker bracket according to the judgment result of the wind speed determination module.

Specifically, the angle fine adjustment device comprises: an angle sensor connected to the tracker bracket for acquiring a posture track of the tracker bracket; and a PID controller respectively connected with the angle sensor and the controller for obtaining an angle adjustment instruction according to the posture track And sent to the controller.

Specifically, the concentrating photovoltaic receiving device 2 is of the same height as the concentrating photothermal receiving tower 1 with a spacing therebetween. In the present embodiment, the concentrating photovoltaic receiving device 2 is distributed around the top end of the concentrating light receiving tower 1, and the concentrating photovoltaic receiving device 2 is symmetrically distributed around the tip end of the concentrating photothermal receiving tower 1.

Specifically, the concentrating photovoltaic receiving device 2 includes an array of photoelectric conversion devices and a heat dissipating device, and the photoelectric conversion device is a multi-junction III-V battery cell, and the heat dissipating device includes an active heat sink or a passive heat sink. The mirror is a flat mirror or a curved mirror. The mirror is hung on the tracker bracket by a hook. The tracker bracket is a two-axis tracker bracket.

Specifically, the plurality of heliostats 3 are arranged in a fan-shaped array centering on the concentrating light-receiving tower 1 , and each of the heliostats 3 can adjust the angle thereof to an angle corresponding to the concentrating-light-receiving tower 1 . The concentrating photovoltaic receiving device 2 is connected to the grid through an inverter or connected to ground energy storage equipment for storage.

Regardless of the intensity of sunshine, the concentrating solar thermal power generation system in this embodiment can effectively ensure the power generation efficiency of the power station, and can also fully utilize the heliostat in the power station, thereby avoiding the idle waste of the heliostat.

Of course, in other embodiments, the angle fine adjustment device of the concentrating solar thermal power generation system in windy weather may be set to other forms; the positional relationship between the concentrating photovoltaic receiving device and the concentrating photothermal receiving tower and the date The positional relationship between the mirror and the concentrating photovoltaic receiving device and the concentrating light receiving tower can be adjusted according to actual needs; the specific structural forms of the concentrating photovoltaic receiving device, the mirror and the tracker bracket can be selectively adjusted; The day mirror can also be arranged circumferentially around the concentrating heat receiving tower.

Embodiment 2

Embodiment 2 discloses another specific embodiment of the concentrating solar thermal power generation system, and the structure thereof is basically the same as that in the first embodiment, except that the concentrating photovoltaic receiving device is opposite to the concentrating photothermal receiving tower. The arrangement position is different. In the present embodiment, the concentrating photovoltaic receiving device 2 and the concentrating light receiving tower 1 are arranged side by side.

Of course, in other embodiments, the relative arrangement of the concentrating photovoltaic receiving device and the concentrating photothermal receiving tower can also be adjusted according to actual needs.

Embodiment 3

This embodiment discloses a concentrating photothermal power generation method, including the steps of:

S10: obtaining an actual sunshine value;

S20: determining whether the actual sunshine value is greater than a preset sunshine value;

S30: if the actual sunshine value is greater than a preset sunshine value, adjusting an angle of the heliostat to adjust the heliostat to an angle corresponding to the concentrating photovoltaic receiving device;

S40: If the actual sunshine value is not greater than the preset sunshine value, adjust the angle of the heliostat to adjust the heliostat to an angle corresponding to the concentrating heat receiving tower.

In the specific implementation process of the embodiment, a plurality of heliostats are provided, and each of the heliostats is correspondingly provided with one preset sunshine value, and the angles of all the heliostats are adjusted according to steps S10-S40. In the future, the power generation efficiency of the concentrating light receiving tower can reach the preset power generation efficiency.

For example, when the actual sunshine value is 900-1000 W/m^2, the angle of 50-60% of the heliostat corresponds to the concentrating photovoltaic receiving device; when the actual sunshine value is 700-900 W/m^2, 20-40 The angle of % heliostat corresponds to the concentrating photovoltaic receiver; when the actual sunshine value is 500-700W/m^2, the angle of 10-20% heliostat corresponds to the concentrating photovoltaic receiver; the actual sunshine value is less than At 500 W/m^2, 100% of the heliostats are projected onto the concentrating light receiving tower.

Of course, in other embodiments, the correspondence between the actual illumination and the adjustment angle of the heliostat can also be adjusted according to actual needs.

Embodiment 4

Embodiment 4 discloses another specific embodiment of the concentrating photothermal power generation method, the steps of which are basically the same as those in the first embodiment, except that in the embodiment, the concentrating photothermal power generation method is further Including steps:

S50: obtaining wind speed;

S60: determining whether the wind speed is greater than a preset wind speed value;

S70: if the wind speed is greater than a preset wind speed value, controlling the heliostat to perform angle fine adjustment, so that the heliostat is maintained at an angle corresponding to the concentrating photovoltaic receiving device or with the concentrating light Receive the angle corresponding to the tower.

Compared with the third embodiment, the concentrating photothermal power generation method in the embodiment can effectively ensure that the heliostat can always be aligned with the concentrating photovoltaic receiving device or the concentrating photothermal receiving tower under windy weather, thereby avoiding high wind conditions. The power generation efficiency of the power station is reduced, so that the power generation method can be applied to an area where the light is sufficient but the sand is large.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should be considered as the scope of protection of the present invention.

Claims (10)

A concentrating photothermal power generation system comprising a concentrating light receiving tower and a plurality of heliostats, characterized in that: Concentrating photovoltaic receiving device; a sunshine acquisition module, wherein the acquisition module is configured to obtain an actual sunshine value; The heliostat includes: a tracker bracket; a mirror fixedly disposed on the tracker bracket; The sunshine judging module is connected to the sunshine obtaining module for determining whether the actual sunshine value is greater than a preset sunshine value; the controller is connected to the tracker bracket and is in communication with the sunshine judging module. Adjusting an angle of the tracker bracket according to a determination result of the sunshine determination module; If the judgment result of the sunshine judgment module is yes, the controller adjusts an angle of the tracker bracket such that an angle of the mirror corresponds to the concentrating photovoltaic receiving device; If the judgment result of the sunshine judgment module is no, the controller adjusts an angle of the tracker bracket such that an angle of the mirror corresponds to the light collection tower. The concentrating solar thermal power generation system according to claim 1, further comprising: a wind speed acquisition module for acquiring an actual wind speed; The wind speed determining module is connected to the wind speed acquiring module, and is configured to determine whether the actual wind speed obtained by the wind speed acquiring module is greater than a preset wind speed value; The heliostat further includes an angle fine adjustment device, and the angle fine adjustment device is in communication with the wind speed determination module, and is configured to adjust a position of the tracker bracket according to the determination result of the wind speed determination module. The concentrating solar thermal power generation system according to claim 1, wherein: The angle fine adjustment device includes: An angle sensor is connected to the tracker bracket for acquiring an attitude trajectory of the tracker bracket; The PID controller is respectively communicatively coupled to the angle sensor and the controller for obtaining an angle adjustment command according to the attitude trajectory and transmitting the signal to the controller. The concentrating solar thermal power generation system according to claim 1, wherein: The concentrating photovoltaic receiving device is the same height as the concentrating light receiving tower and has a spacing therebetween. The concentrating solar thermal power generation system according to claim 4, wherein: The concentrating photovoltaic receiving device is distributed around the top end of the concentrating light receiving tower, and the concentrating photovoltaic receiving device is symmetrically distributed around the top end of the concentrating light receiving tower; or; The concentrating photovoltaic receiving device is disposed side by side with the concentrating photothermal receiving tower. The concentrating solar thermal power generation system according to claim 1, wherein: The concentrating photovoltaic receiving device comprises an array of photoelectric conversion devices and a heat dissipating device, wherein the photoelectric conversion device is a multi-junction III-V battery cell, and the heat dissipating device comprises an active heat sink and/or a passive heat sink; and / or; The mirror is a plane mirror or a curved mirror; and / or; The mirror is hung on the tracker bracket by a hook; and / or; The tracker bracket is a two-axis tracker bracket. The concentrating solar thermal power generation system according to any one of claims 1 to 6, wherein: a plurality of the heliostats are arranged in a fan array or a circumference in a center of the concentrating heat receiving tower, and each heliostat can adjust an angle thereof to an angle corresponding to the concentrating heat receiving tower ; and / or; The concentrating photovoltaic receiving device is connected to the power grid through an inverter or connected to ground energy storage equipment for storage. A concentrating photothermal power generation method, comprising the steps of: S10: obtaining an actual sunshine value; S20: determining whether the actual sunshine value is greater than a preset sunshine value; S30: if the actual sunshine value is greater than a preset sunshine value, adjusting an angle of the heliostat to adjust the heliostat to an angle corresponding to the concentrating photovoltaic receiving device; S40: If the actual sunshine value is not greater than the preset sunshine value, adjust the angle of the heliostat to adjust the heliostat to an angle corresponding to the concentrating heat receiving tower. The concentrating photothermal power generation method according to claim 8, further comprising the steps of: S50: obtaining wind speed; S60: determining whether the wind speed is greater than a preset wind speed value; S70: if the wind speed is greater than a preset wind speed value, controlling the heliostat to perform angle fine adjustment, so that the heliostat is maintained at an angle corresponding to the concentrating photovoltaic receiving device or with the concentrating light Receive the angle corresponding to the tower. The concentrating photothermal power generation method according to claim 8, wherein: The number of the heliostats is plural, and each of the heliostats is provided with one predetermined sunshine value, so that the power generation efficiency of the concentrating light-receiving tower is maintained at a preset power generation efficiency; When the actual solar value is 900-1000 W/m^2, 50-60% of the heliostats have an angle corresponding to the concentrating photovoltaic receiving device; When the actual solar value is 700-900 W/m^2, 20-40% of the heliostats have an angle corresponding to the concentrating photovoltaic receiving device; When the actual solar value is 500-700 W/m^2, 10-20% of the heliostats have an angle corresponding to the concentrating photovoltaic receiving device; When the actual solar value is less than 500 W/m^2, 100% of the heliostats are projected onto the concentrating light receiving tower.

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