Electric voltage idle-work fast control method of speed-changing constant frequency wind generator group wind power station

Abstract

A voltage reactive power fast control method for the wind power station of a variable-speed constant-frequency wind-power machine group, which comprises the following steps: 1, converting the voltage of an access node of the wind power station; 2, judging and selecting a reactive control mode; 3, establishing a reactive compensation scheme of the wind power station; 4, establishing a reactive compensation distribution scheme of the wind-power machine group; 5, sending a reactive control command; 6, triggering the next control by judging and controlling timelag. The method takes the voltage of the access node of the wind power station as an object of regulation and control; takes the steady-state operation voltage of the access node of the wind power station as a target of regulation and control; comprehensively considers the coordination between the wind power station and an electric network to carry out uniform planning of the reactive compensation of the whole wind power station, so as to lead all the machine groups in the wind power station to be capable of reasonably adjusting the reactive power, thus ensuring the reactive compensation of the whole station to be sufficient, preventing the wind-power machine group from acting frequently under the situation of real time changing of the voltage of the electric network, realizing reactive fast control and being help for maintaining the voltage stabilization of the electric network of an access area.

Description

Technical field [0001] The invention relates to a method for quickly controlling voltage and reactive power of a wind farm of a variable-speed constant-frequency wind turbine, and belongs to the technical field of wind farm voltage and reactive power control in new energy power generation technology. Background technique [0002] As one of the new energy technologies with the most large-scale development and commercial development prospects, wind power has attracted more and more attention from various countries. The centralized connection of large-scale clustered wind farms to the grid is the main application mode of wind power generation in my country. The most direct impact of wind farm access on the grid is the voltage and reactive power problems at the access point, including voltage fluctuations and flicker caused by wind changes, excessive voltage amplitude caused by changes in working conditions, unqualified power factors, and so on. [0003] At present, the usual method ...

AI Technical Summary

Problems solved by technology

[0006] First, the WindVAR system uses the wind turbine as the control unit, lacks unified planning for the reactive power of the entire wind farm, and the wind turbine autonomous control

Once the output reactive power of some wind turbines in the wind farm reaches the limit, each wind turbine is relatively autonomous and lacks mutual coordination, resulting in insufficient or excess reactive power compensation for the entire field;

[0007] Second, the wind turbine control under the control of the WindVAR system is too frequent

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