CN104574222A - Method for storing distributed photovoltaic power station operation data - Google Patents

Abstract

The invention relates to a method for storing operating data of a distributed photovoltaic power station, comprising: obtaining the sunshine time of the current season in the area where the distributed photovoltaic power station is located; determining the working hours of the distributed photovoltaic power station; determining the time series data generated by the operation of the distributed photovoltaic power station and type; store the working time data of distributed photovoltaic power plants. The technical solution provided by the invention takes advantage of the fact that the photovoltaic power station does not work at night, and ignores the non-working period of the photovoltaic power station at night when storing the data of the photovoltaic power station, thereby greatly saving storage space and improving the search speed for stored data .

Description

A method for storing operating data of distributed photovoltaic power plants

technical field

The invention relates to a method in the field of new energy power generation, in particular to a method for storing operating data of a distributed photovoltaic power station.

Background technique

Distributed photovoltaic power generation specifically refers to photovoltaic power generation facilities built near the user's site, whose operation mode is self-consumption on the user side, surplus electricity connected to the grid, and characterized by the balanced adjustment of the power distribution system.

Distributed photovoltaic power generation follows the principles of adapting measures to local conditions, clean and efficient, decentralized layout, and nearby utilization, making full use of local solar energy resources to replace and reduce fossil energy consumption.

Distributed photovoltaic power generation specifically refers to a distributed power generation system that uses photovoltaic modules to directly convert solar energy into electrical energy. It is a new type of power generation and comprehensive utilization of energy with broad development prospects. It advocates the principles of nearby power generation, nearby grid connection, nearby conversion, and nearby use. It can not only effectively increase the power generation of photovoltaic power plants of the same scale, but also It effectively solves the problem of power loss in boosting and long-distance transportation.

At present, the most widely used distributed photovoltaic power generation system is a photovoltaic power generation project built on the roof of urban buildings. Such projects must be connected to the public grid, and together with the public grid, provide power to nearby users.

Distributed photovoltaic power generation has the following characteristics:

One is that the output power is relatively small. Generally speaking, the capacity of a distributed photovoltaic power generation project is within several thousand watts. Unlike centralized power plants, the size of photovoltaic power plants has little impact on power generation efficiency, so it also has little impact on its economy. The return on investment of small photovoltaic systems will not be lower than that of large ones.

Second, the pollution is small and the environmental benefits are outstanding. During the power generation process of distributed photovoltaic power generation projects, there is no noise and no pollution to air and water.

The third is to alleviate the local electricity shortage to a certain extent. However, the energy density of distributed photovoltaic power generation is relatively low. The power of distributed photovoltaic power generation system per square meter is only about 100 watts. In addition, the roof area of buildings suitable for installing photovoltaic modules is limited, which cannot fundamentally solve the problem of power shortage. .

Fourth, electricity generation and electricity consumption can coexist. The power generation of large-scale ground power stations is boosted and connected to the transmission network, and it only operates as a power generation station; while distributed photovoltaic power generation is connected to the distribution network, where power generation and consumption coexist, and it is required to consume as much as possible on the spot.

Distributed photovoltaic power generation system, also known as distributed power generation or distributed energy supply, refers to the configuration of smaller photovoltaic power generation and power supply systems at the user site or near the power consumption site to meet the needs of specific users and support the economy of the existing distribution network. operation, or both.

The basic equipment of the distributed photovoltaic power generation system includes photovoltaic cell components, photovoltaic array brackets, DC combiner boxes, DC power distribution cabinets, grid-connected inverters, AC power distribution cabinets and other equipment, as well as power supply system monitoring devices and environmental monitoring device. Its operation mode is that under the condition of solar radiation, the solar cell module array of the photovoltaic power generation system converts the solar energy into the output power, and sends it to the DC power distribution cabinet through the DC combiner box, and is converted into AC power by the grid-connected inverter. The building's own load, excess or insufficient electricity is regulated by connecting to the grid.

With the promulgation of policies to encourage the development of distributed photovoltaics, a large number of distributed photovoltaic power stations have been connected, which has had a great impact on the power balance of the power system. In order to ensure the safe operation of the system, the actual operation of the distributed photovoltaic power station must be monitored. However, due to the large number of distributed photovoltaic power plants and the huge amount of data to be stored, in order to save storage space, it is necessary to improve the operation data storage method of distributed photovoltaic power plants.

Contents of the invention

In order to solve the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for storing the operating data of a distributed photovoltaic power station, which takes advantage of the fact that the photovoltaic power station does not work at night, and ignores the photovoltaic power station at night when storing the data of the photovoltaic power station. non-working period, which greatly saves storage space, and also helps to improve the search speed of stored data. In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is presented below. This summary is not an overview, nor is it intended to identify key/critical elements or delineate the scope of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

The object of the present invention is to adopt following technical scheme to realize:

The present invention provides a method for storing operating data of a distributed photovoltaic power station. The improvement is that the method includes the following steps:

(1) Obtain the sunshine time of the current season in the area where the distributed photovoltaic power station is located;

(2) Determine the working hours of the distributed photovoltaic power station;

(3) Obtain the time series data and types generated by the operation of distributed photovoltaic power plants;

(4) Store the working time data of the distributed photovoltaic power station.

Further, the step (1) includes: obtaining the sunshine time distribution data in the longitude and latitude region from the existing meteorological database; according to the longitude and latitude where the distributed photovoltaic power station is located, finding the sunshine time distribution in the area where the distributed photovoltaic power station is located, and obtaining the sunshine time distribution of the current season time.

Further, the step (2) includes: the sunshine intensity affects the working time of the distributed photovoltaic power station, then the photovoltaic panel power=conversion coefficient*sunlight intensity, the sunshine time start Trs is the start time when the photovoltaic panel has output power, and the sunshine end time Tre is the time when the photovoltaic panel stops outputting power, and the working time of the distributed photovoltaic power station is t=Tre-Trs.

Further, in the step (3), from the equipment or monitoring platform of the distributed photovoltaic power station, the time series data and types generated by the operation of the distributed photovoltaic power station are obtained with 104, modbus real-time communication protocol; the time series data types include : Inverter power, inverter operating status, distributed photovoltaic power plant active power, reactive power and other telemetry and telesignaling data.

Further, in the step (4), the traditional storage method stores each telemetry and remote signaling data in a full period, such as storing active power as P(Date,0,0...,0,Pts...Pte,0, ...,0,0), according to the working time obtained in step (2), add time-series identifiers to the time series data of distributed photovoltaic power plants, and express the data as P(Date,Trs,Tre,t,Pts,… ,Pte), stored in the database in units of days.

Compared with the closest prior art, the excellent effect that the technical solution provided by the present invention has is:

The invention provides a method for storing operating data of a distributed photovoltaic power station. Take advantage of the fact that distributed photovoltaic power plants do not work at night. In terms of data storage, the working time of the photovoltaic power station is determined according to the latitude and longitude of the location and the season, and only the working time of the photovoltaic power station is used for data storage. Hourly data, however, the effective data in each region is only in the sunshine time, so the daily invalid data will take up a lot of space, so this method can not only ensure the storage of valid data, but also greatly reduce the storage of irrelevant data and improve the utilization of disk space . In terms of data reading and writing, since the amount of invalid data is greatly reduced, the query speed will also be greatly improved when querying a certain moment.

To the above and related ends, one or more embodiments comprise the features hereinafter specified and particularly pointed out in the claims. The following description and drawings detail certain exemplary aspects and are indicative of but a few of the various ways in which the principles of various embodiments may be employed. Other benefits and novel features will become apparent upon consideration of the following detailed description in conjunction with the accompanying drawings, and the disclosed embodiments are intended to include all such aspects and their equivalents.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is a brief flowchart of a method for storing operating data of a distributed photovoltaic power station in an embodiment of the present invention;

Fig. 2 is a technical introduction diagram of a method for storing operating data of a distributed photovoltaic power station in an embodiment of the present invention.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The following description and drawings illustrate specific embodiments of the invention sufficiently to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the present invention includes the full scope of the claims, and all available equivalents of the claims. These embodiments of the present invention may be referred to herein, individually or collectively, by the term "invention", which is for convenience only and is not intended to automatically limit the application if in fact more than one invention is disclosed The scope is any individual invention or inventive concept.

As shown in Figures 1 and 2, they are respectively a brief flow chart and a technical introduction diagram of the method for storing distributed photovoltaic power plant operating data in the embodiment of the present invention. The present invention provides a method for storing distributed photovoltaic power plant operating data, including the following The above steps:

1. Obtain the sunshine time distribution data of each longitude and latitude region from the existing meteorological database;

2. According to the longitude and latitude of the photovoltaic power station, find the distribution of sunshine time in the area where the photovoltaic power station is located, and obtain the sunshine time of the current season; because factors such as sunshine intensity, temperature, and cloud cover will directly affect the photoelectric conversion efficiency of photovoltaic panels, among which sunshine intensity has the greatest impact, It can be approximated as photovoltaic panel power = conversion coefficient * sunshine intensity, so the beginning of sunshine time (Trs) is the start time when the photovoltaic panel has output power, and the end time of sunshine (Tre) is the time when the photovoltaic panel stops outputting, and the distributed photovoltaic power station works Time t = Tre - Trs.

3. Determine the working time of the photovoltaic power station according to the obtained sunshine time;

4. Obtain the time series data and types generated by the operation of photovoltaic power plants from equipment or monitoring platforms;

From the equipment or monitoring platform of the distributed photovoltaic power station, use 104, modbus real-time communication protocol to obtain the time series data and types generated by the operation of the distributed photovoltaic power station; the time series data types include: inverter power, inverter operating status , Distributed photovoltaic power station active power, reactive power and other telemetry and remote signaling data.

5. Add the time series data of the photovoltaic power station with time-period identification, and store it in the database on a daily basis.

The traditional storage method stores each telemetry and telesignaling data in a full time period. For example, the active power is stored as P(Date,0,0...,0,Pts...Pte,0,...,0,0), according to the steps (2 The working time obtained in ) is the time series data of the distributed photovoltaic power station plus a time-period mark, and the data is expressed as P(Date,Trs,Tre,t,Pts,…,Pte), and stored in the database in units of days middle.

The invention utilizes the feature that the photovoltaic power station does not work at night, and ignores the non-working period of the photovoltaic power station at night when designing the data storage structure, thereby greatly saving storage space and improving the search speed for stored data.

It is understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy described.

In the foregoing Detailed Description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, the invention lies in less than all features of a single disclosed embodiment. Thus the following claims are hereby expressly incorporated into the Detailed Description, with each claim standing on its own as a separate preferred embodiment of this invention.

The foregoing description includes illustrations of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods to describe the above-mentioned embodiments, but those skilled in the art should recognize that various embodiments can be further combined and permuted. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "comprises" is used in the specification or claims, the word is encompassed in a manner similar to the term "comprises" as interpreted when "comprises" is used as a link in the claims. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still implement the present invention Any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention is within the protection scope of the claims of the pending application of the present invention.

Claims (5)

1. A method for storing distributed photovoltaic power plant operating data, characterized in that the method comprises the steps of: (1) Obtain the sunshine time of the current season in the area where the distributed photovoltaic power station is located; (2) Determine the working hours of the distributed photovoltaic power station; (3) Obtain the time series data and types generated by the operation of distributed photovoltaic power plants; (4) Store the working time data of the distributed photovoltaic power station. 2. The method according to claim 1, wherein the step (1) comprises: obtaining the sunshine time distribution data in the longitude and latitude region from the existing meteorological database; Sunshine time distribution in the area where the power station is located, to obtain the sunshine time of the current season. 3. The method according to claim 1, wherein the step (2) comprises: the sunshine intensity affects the working time of the distributed photovoltaic power station, then the photovoltaic panel power=conversion coefficient*sunlight intensity, and the sunshine time starts Trs as The photovoltaic panel has a start time of output power, the sunshine end time Tre is the time when the photovoltaic panel stops outputting power, and the working time of the distributed photovoltaic power station is t=Tre-Trs. 4. The method according to claim 1, characterized in that, in the step (3), from the equipment or monitoring platform of the distributed photovoltaic power station, obtain the time generated by the operation of the distributed photovoltaic power station with 104, modbus real-time communication protocol Sequence data and types; the time series data types include: inverter power, inverter operating status, distributed photovoltaic power plant active power and reactive power telemetry data, and telesignaling data. 5. The method according to claim 1, characterized in that, in the step (4), according to the working hours obtained in the step (2), add a time-series identifier to the time series data of the distributed photovoltaic power plant, and set The data is expressed as P(Date,Trs,Tre,t,Pts,…,Pte), and stored in the database in units of days.