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Voltage threshold probability-based reactive power optimizing method for grid containing wind power plant

A technology of voltage over-limit and optimization method, applied in reactive power compensation, AC network voltage adjustment, etc.

Inactive Publication Date: 2012-09-19
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the problem that the traditional reactive power optimization in the grid-connected wind farm cannot achieve the expected loss reduction and ensure the voltage quality, so that the grid can accept more wind power generation, the present invention proposes a no work optimization method

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  • Voltage threshold probability-based reactive power optimizing method for grid containing wind power plant
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  • Voltage threshold probability-based reactive power optimizing method for grid containing wind power plant

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Embodiment Construction

[0055] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples, but the implementation and protection of this description are not limited thereto.

[0056] The reactive power optimization method of the power grid containing wind farms based on the probability of voltage exceeding the limit includes:

[0057] (1) Collect the operating parameters of the power grid, the basic parameters of the wind turbines of each wind farm and the long-term active output data of the wind farm. Grid operation parameters include: grid topology, line parameters, substation parameters, load parameters, generator parameters, allowable operating range of node voltage, reactive power compensation equipment parameters, node number set N and wind farm number W. Grid topology refers to the connection mode of lines and lines, lines and transformers in the power grid. The line parameters of each line include the line u...

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Abstract

The invention provides a voltage threshold probability-based reactive power optimizing method for a grid containing a wind power plant, which aims to solve the problem that under the condition of wind power networking, the effect of the voltage optimizing control to an automatic voltage control system is not ideal. The method comprises the steps as follows: firstly, collecting grid operation parameters, basic parameters of each wind power generator in the wind power plant, and active power output data of the wind power plant; secondly, acquiring voltage impact factor, power conversion coefficient of the wind power generators and wind power plant active power probability distribution equation through the above parameters, and further obtaining voltage threshold probability; and lastly, establishing a reactive power optimizing model on the basis of the voltage threshold probability, adopting genetic algorithm to solve the model, and obtaining a control instruction of a reactive power device. According to the invention, the voltage threshold probability-based reactive power optimizing method substitutes a conventional reactive power optimizing method for the automatic voltage control system, can enable the voltage optimizing control to the automatic voltage control system to effectively control the reactive power device in the grid under the condition of wind power networking, and ensure the safe and economic operation of the grid.

Description

technical field [0001] The invention relates to a reactive power operation method of an electric power system, in particular to a reactive power operation method of a power grid including a wind farm. Background technique [0002] With the increase in the number and capacity of wind farms, the randomness and intermittency of wind power will bring more rapid fluctuations to the system voltage, and the automatic voltage control system based on timing reactive power optimization calculation will be greatly affected. Frequent operation often fails to achieve the expected effect of reducing loss and ensuring voltage quality. [0003] Specifically, the control strategy of the regional power grid automatic voltage control system usually consists of an on-site correction strategy that starts at any time and a regional reactive power optimization control strategy that starts periodically (for example, every 15-30 minutes). The latter is usually calculated and controlled for the curr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16
CPCY02E40/34Y02E40/30
Inventor 张勇军王孟邻黄毅
Owner SOUTH CHINA UNIV OF TECH
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