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Wind farm voltage control method based on voltage operating state

A voltage control method and technology of operation status, applied in wind power generation, single grid parallel feeding arrangement, reactive power compensation, etc., can solve the problems of lack of control of the terminal voltage of wind turbines, not considering the reactive power distribution of wind farms, etc.

Active Publication Date: 2014-05-28
TSINGHUA UNIV
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Problems solved by technology

[0003] However, the existing automatic voltage control system in the wind farm often only takes the voltage of the grid-connected point of the wind farm as the control target, lacks the control of the terminal voltage of the wind turbine, and does not consider whether the reactive power distribution in the wind farm is reasonable

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  • Wind farm voltage control method based on voltage operating state
  • Wind farm voltage control method based on voltage operating state
  • Wind farm voltage control method based on voltage operating state

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Embodiment Construction

[0034] The wind farm voltage control method based on the voltage operating state proposed by the present invention comprises the following steps:

[0035] (1) Assume that the actual voltage of the grid-connected point where the wind farm is connected to the grid is The grid-connected point voltage control target value issued by the grid regional dispatch center is Set the voltage qualified threshold as V Dead , to judge the voltage status of the grid-connected point where the wind farm is connected to the grid, if The grid-connected point voltage of the wind farm is in a normal state, if The grid-connected point voltage of the wind farm is in the tracking state;

[0036] (2) Assume that the per unit value of the terminal voltage value of each fan in the wind farm is V G , the per unit value of the safety reference value of the fan terminal voltage value is Let η 1 , η 2 , η 3 are three judgment values, and 01 2 3 The voltage at the fan terminal is in a normal s...

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Abstract

The invention relates to a wind farm voltage control method based on voltage operating states, belonging to the technical field of automatic voltage control of a power system. The method defines eight states of a wind farm according to wind farm synchronization point voltage and wind turbine-side voltage. According to different states of the wind farm, three kinds of corresponding voltage control strategies are executed to realize three different control targets, i.e. the turbine-side voltage of all wind turbines in the wind farm is controlled within a safe range to realize a wind farm synchronization point voltage control target V issued by a dispatching center and eliminate cross-main-transformer reactive ring current Qcir in the wind farm. The method can be integrated in an automatic voltage control system which operates in the field of the wind farm to enable the system to execute the most proper control strategies in real time according to the voltage states of the wind farm, so as to meet different control demands.

Description

technical field [0001] The invention relates to a voltage control method of a wind farm based on a voltage operating state, and belongs to the technical field of automatic voltage control of electric power systems. Background technique [0002] In recent years, wind turbines in wind farms have frequently been disconnected from the grid due to voltage problems, and setting up an automatic voltage control system in wind farms is considered to be an effective means to solve the voltage problem of wind farms. The automatic voltage control of the wind farm is to use the fans in the wind farm, the static var compensation device, the static var generator, and other equipment to complete the safety optimization control of the reactive voltage in the wind farm. However, unlike water-fired power plants, wind farms have multiple control objectives in voltage control: the automatic voltage control system in the wind farm not only needs to complete the control objectives issued by the di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/18
CPCY02E10/763Y02E40/30Y02E10/76
Inventor 孙宏斌郭庆来王彬张伯明吴文传汤磊刘翊枫陈锐
Owner TSINGHUA UNIV
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