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Method for calculating sensitivity of wind power plant reactive power on voltage based on perturbation method

A wind farm and sensitivity technology, applied in the field of automatic voltage control of power systems, can solve problems such as unrealistic conditions and achieve good voltage control effects

Active Publication Date: 2012-11-07
TSINGHUA UNIV +1
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Problems solved by technology

At present, most of the actual engineering sites of wind farms do not have the conditions for the realization of method ①, so local parameter identification is required

Method used

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  • Method for calculating sensitivity of wind power plant reactive power on voltage based on perturbation method
  • Method for calculating sensitivity of wind power plant reactive power on voltage based on perturbation method
  • Method for calculating sensitivity of wind power plant reactive power on voltage based on perturbation method

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Embodiment Construction

[0025] The method for calculating the sensitivity of wind farm reactive power to voltage based on the perturbation method proposed by the present invention comprises the following steps:

[0026] (1) During the time period T (T can be less than 5 seconds), the reactive power value change at the high-voltage bus of the grid-connected point where the wind farm is connected to the grid is: (For example, a group of capacitors in the booster station of the wind farm can be switched), and the voltage change of the high-voltage bus is measured as Then the sensitivity perturbation value of the reactive power at the high-voltage bus at the grid-connected point of the wind farm to the voltage at this place is for Among them, 0 secondsfigure 1 It can be seen that the wind farm network has the characteristics of a tree network (the node where the equivalent power supply of the external grid is located can be regarded as the "root node". When calculating the equivalent impedance matri...

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Abstract

The invention relates to a method for calculating sensitivity of wind power plant reactive power on voltage based on a perturbation method and belongs to the technical field of automatic voltage control of a power system. The method comprises the following steps of: identifying the equivalent impedance of an external power grid accessing to the wind power plant according to the sensitivity of reactive power at a wind power plant grid-connected point on the voltage of the wind power plant through the perturbation method, and forming a complete power network together with a power network in the wind power plant; combining real-time measurement in the wind power plant to form a jacobian matrix, and calculating to obtain the sensitivity matrix of the reactive powers among the nodes in the wind power plant on the voltage; and finally, checking the calculation result by using the obtained sensitivity of the reactive power on the voltage through the perturbation method, if not, identifying the equivalent impedance of the external power grid again, and calculating the sensitivity matrix of the reactive power on the voltage until the sensitivity matrix passes the check. According to the method, the high-accuracy sensitivity matrix of the reactive power on the voltage is obtained finally and is used for voltage control in the wind power plant.

Description

technical field [0001] The invention relates to a method for calculating the sensitivity of wind farm reactive power to voltage based on a perturbation method, 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 control the voltage by controlling the reactive power of the fans in the wind farm, the static var compensation device, the static var generator, and other equipment. The most important control parameter in the process of wind farm voltage control is the sensitivity of reactive power to voltage. The sensitivity of reactive power to voltage is used to characterize the linear relationshi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/763Y02E10/76
Inventor 郭庆来孙宏斌刘翊枫许晓菲江长明贾琳张伯明吴文传王彬陈锐
Owner TSINGHUA UNIV
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