A reactive power and voltage control system and method for wind farm clusters based on reactive power margin

Abstract

A wind farm cluster reactive power and voltage control system and method based on reactive power margin, belonging to the field of reactive power and voltage control technology for wind farm grid-connected operation; the system includes: a reactive power and voltage control module, a switch, a wind farm data processing module, Wind turbine controller, reactive power compensation equipment controller, wind turbine parameter acquisition device and reactive power compensation equipment reactive power acquisition device; this method first calculates the reactive power of the wind farm reactive voltage control, and determines the reactive power that each wind farm should emit power, and then optimize the distribution of the reactive power of each wind farm to obtain the optimized reactive power of each wind turbine and the reactive power of the reactive compensation equipment. Finally, by adjusting the rotor side current of each wind turbine and the reactive power of each reactive compensation equipment switch to adjust the reactive power of each fan and reactive power compensation equipment; the invention can solve the problem of reducing the life of the fan caused by full reactive power and the uneconomical operation of the wind farm and the problem of the fan being off-grid.

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 ...

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