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Photovoltaic stabilization method and system based on novel wavelet packet basis decomposition

A wave packet-based and wavelet packet technology, applied in photovoltaic power generation, single-network parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve problems such as long processing time and non-adaptiveness

Active Publication Date: 2020-07-21
XIHUA UNIV
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Problems solved by technology

[0007] In view of this, the present invention provides a photovoltaic stabilization method based on a novel wavelet packet basis decomposition algorithm. By improving the processing method of photovoltaic volatility, the traditional photovoltaic stabilization method has a long processing time and is not self-adaptive.

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  • Photovoltaic stabilization method and system based on novel wavelet packet basis decomposition

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[0034] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Such as figure 1 As shown, a photovoltaic stabilization method based on a new wavelet packet basis decomposition algorithm, including:

[0036] S1: Obtain short-term photovoltaic forecast data and generate photovoltaic fluctuation rate; preferably, when the photovoltaic fluctuation rate does not exceed the grid connection standard, the photovoltaic power generation unit (2) is connected to the grid. In the case that the photovoltaic fluctuation rate exceeds the grid-connected standard, continue to execute S2. Preferably, obtaining the short-term photovoltaic forecast data may be calculated by using weather forecast data of each forecast point within the forecast period. Preferably, the photovoltaic fluctuation ra...

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Abstract

The invention discloses a photovoltaic stabilization method based on a novel wavelet packet basis decomposition algorithm. The method comprises the following steps: S1, obtaining short-time photovoltaic prediction data and generating a photovoltaic fluctuation ratio; S2, calculating the photovoltaic volatility through a novel wavelet packet basis decomposition algorithm to generate first target power; and S3, generating a scheduling signal through the first target power. According to the invention, a traditional wavelet packet basis decomposition algorithm is improved and an evaluation function is introduced; the operation speed and the operation efficiency of the algorithm can be improved through the additivity of the evaluation function; different first power tracks can be formed based on the photovoltaic fluctuation rates of different time periods, SO THAT the approaching degree of the scheduling signal and the first power track can be ensured to be the highest at any time, the photovoltaic stabilization system can adaptively distribute the overall output of the photovoltaic power generation unit and the photovoltaic stabilization unit, the operation speed of the photovoltaic power generation unit and the photovoltaic stabilization unit is improved, and good real-time performance and a good stabilization effect are obtained.

Description

technical field [0001] The invention relates to the technical field of distribution network photovoltaic fluctuation stabilization, in particular to a photovoltaic stabilization method and system based on novel wavelet packet basis decomposition. Background technique [0002] With the decrease of traditional energy sources and the increasingly prominent environmental problems, vigorously developing and utilizing renewable energy sources has become a basic national policy of our country. Among them, photovoltaic power generation is one of the ideal sustainable energy sources, which has the characteristics of no pollution, no noise, safety and reliability. [0003] However, with the gradual increase of photovoltaic installed capacity in the power grid, the random fluctuation of photovoltaic power generation will affect the real-time power balance of the power grid, causing fluctuations in the voltage and frequency of the power grid, and affecting the power quality and stabilit...

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Application Information

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IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24Y02E10/56
Inventor 王军吴帆孙章陈磊
Owner XIHUA UNIV
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