Reactive power margin based reactive voltage control system and method of wind power plant cluster

A voltage control system and voltage control technology, applied in wind power generation, electrical components, circuit devices, etc., can solve problems such as network loss and node voltage optimization, wind turbine off-grid, and uneconomical wind farm operation.

Active Publication Date: 2016-11-16
NORTHEASTERN UNIV
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Problems solved by technology

Although this method solves the problem of full reactive power generation of wind turbines, it cannot optimize the network loss and...

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  • Reactive power margin based reactive voltage control system and method of wind power plant cluster
  • Reactive power margin based reactive voltage control system and method of wind power plant cluster
  • Reactive power margin based reactive voltage control system and method of wind power plant cluster

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Embodiment Construction

[0042]An embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0043] In this embodiment, a domestic wind farm cluster is taken as an example. The wind farm cluster has 4 wind farms, and each wind farm has 32 1.5MW double-fed induction wind turbines with a total capacity of 192MW. There are 4 branch circuits in each wind farm, and 8 wind turbines are connected to each branch circuit. The outlet voltage of the wind turbine is 690V, which is raised to 35kV by a 2MWVA box-type transformer and connected to the connection point of the wind farm, and then aggregated to a 220kV bus through the main transformer to transmit electric energy to the outside.

[0044] Such as figure 1 As shown, the wind farm cluster reactive power and voltage control system based on reactive power margin in this embodiment includes:

[0045] Reactive power and voltage control module, switch, multiple wind farm reactive power and voltage con...

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Abstract

The invention relates to a reactive power margin based reactive voltage control system and method of a wind power plant cluster, and belongs to the technical field of reactive voltage control of a wind power plant during grid-connected running. The system comprises a reactive voltage control module, a switchboard, a wind power plant data processing module, a fan controller, a reactive compensation equipment controller, a fan parameter acquisition device and a reactive compensation equipment reactive power acquisition device. The method comprises the following steps of firstly, calculating reactive power of reactive voltage control of the wind power plant, and determining reactive power which shall be sent from each wind power plant; secondly, optimizing and allocating the reactive power of each wind power plant to obtain the optimized reactive power of each fan and the optimized reactive power of reactive compensation equipment; and finally, adjusting the reactive powers of each fan and the reactive compensation equipment by adjusting a current of a rotor side of each fan and on-off of each reactive compensation equipment. By the system and the method, the problems that the service lifetime of the fan is reduced caused by reactive power of the fan during full power, the wind power plant is not economic in running and the fan gets out of grid can be solved.

Description

technical field [0001] The invention belongs to the technical field of reactive voltage control for wind farm grid-connected operation, and in particular relates to a wind farm cluster reactive voltage control system and method based on reactive power margin. Background technique [0002] With the increasing grid-connected capacity of wind power in the power system, the research on voltage control of wind farm grid-connected points is getting more and more in-depth, and there are more and more control methods for wind farm reactive power voltage. [0003] In the method of voltage control at the grid-connected point of wind farms, making full use of the reactive power of doubly-fed wind turbines for reactive power voltage control can reduce the investment and use of reactive power compensation equipment, and to a certain extent can reduce the investment of wind farms. However, in the research on doubly-fed wind turbines, it is found that the longer the wind turbine generates ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/50
CPCH02J3/386H02J3/50Y02E10/76
Inventor 张化光杨珺郝敬孙秋野刘鑫蕊杨东升王智良黄博南会国涛
Owner NORTHEASTERN UNIV
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