Photovoltaic output fluctuation stabilizing method considering system capacity credibility

A technology of output fluctuation and system capacity, which is applied in the field of photovoltaic system power generation control, can solve the problems of large capacity design of energy storage system, achieve good applicability, improve the effect of stabilization, and improve the overall economic effect

Active Publication Date: 2019-11-05
HOHAI UNIV CHANGZHOU
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Problems solved by technology

[0005] The purpose of the present invention is to provide a photovoltaic output fluctuation stabilization method that considers the reliability of system capacity, which fully considers the role of photovoltaic system capacity reliability in photovoltaic system planning and other aspects, and combines energy storage devices to control output fluctuations of photovoltaic systems Stabilization, which solves the problem of excessive design of energy storage system capacity commonly found in current energy storage stabilization technologies

Method used

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  • Photovoltaic output fluctuation stabilizing method considering system capacity credibility
  • Photovoltaic output fluctuation stabilizing method considering system capacity credibility
  • Photovoltaic output fluctuation stabilizing method considering system capacity credibility

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Embodiment

[0083] Taking a small household micro-grid system in the east as an example, its historical temperature and irradiation parameters are obtained, and the output power of the photovoltaic system is calculated by establishing a four-parameter method model in matlab. The output curve of the photovoltaic system is as follows figure 2 shown.

[0084] Select the time length of one day as the historical time length, and only need to expand the data collection time to obtain the local load usage and the output power of the power system not connected to the photovoltaic system during the day. The power supply curve of the system is as follows image 3 As shown, the load usage curve is shown as Figure 4 shown. Compare it, get its low power time, calculate LOLP 1 :

[0085]

[0086] image 3 and Figure 4 In the figure, the unit of abscissa is the data collection step, because the data is actually collected by various sensors, affected by the collection and transmission accurac...

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Abstract

The invention discloses a photovoltaic output fluctuation stabilizing method considering system capacity credibility. The method comprises a step of predicting an output curve of a photovoltaic systembased on the collection of historical meteorological parameters of a photovoltaic installation location, a step of ensuring the system reliability before and after a photovoltaic system is connectedwith LOLP as an evaluation index, solving a payload amount corresponding to the photovoltaic system through iteration and calculating a capacity reliability of the photovoltaic system, a step of analyzing the output of the photovoltaic system and calculating a the capacity of a corresponding energy storage system with the combination of a requirement of grid connection, and a step of optimizing anoutput value of the photovoltaic system to be stabilized and obtaining an optimal capacity of the energy storage system. According to the method, the output fluctuation of the photovoltaic system isstabilized with the combination of the energy storage device, the problem that the capacity design of the energy storage system existing in the current energy storage stabilization technology is too large is solved, the stabilizing effect is improved without affecting the grid connection reliability, and the overall economic performance of the system is improved.

Description

technical field [0001] The invention relates to a method for stabilizing photovoltaic output fluctuations in consideration of system capacity reliability, and belongs to the technical field of photovoltaic system power generation control. Background technique [0002] Solar energy is abundant and easy to obtain, and it is an important renewable energy source. In recent years, distributed photovoltaic power generation systems have been widely used. However, the output of photovoltaic power generation is unstable, and the access of a large number of distributed photovoltaic power generation systems has affected the dispatch and stable operation of large power grids. Therefore, it is necessary to determine the actual effective capacity of the grid-connected photovoltaic system, solve the grid-connected reliability of the photovoltaic system, and correct the energy storage stabilization parameters of the photovoltaic system, so as to improve the power supply reliability of the ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/28
CPCH02J3/28Y02E10/56Y02E70/30
Inventor 赵远哲张臻徐晓宇颜子阳雷鑫覃丽敏祝曾伟刘富光
Owner HOHAI UNIV CHANGZHOU
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