Reactive Power Optimization Control Method for Wind Farms to Actively Participate in Grid Voltage Regulation

Abstract

AbstractThe traditional method of wind farms following the voltage command of the main station can easily lead to frequent fluctuations of the reactive power source in the station and insufficient reactive power margin in the station, thereby reducing the safety margin of the voltage of the wind farm. To this end, a reactive power coordination and optimal control method for wind farms participating in actively voltage regulation of power grids is proposed. First, based on the wind farm power prediction data and voltage sensitivity, the voltage fluctuation trajectory of the grid connection point is predicted; by coordinating the reactive power output of the fan and SVG, the adjustment frequency of reactive power equipment is effectively reduced. Secondly, the detailed operation scenarios are divided according to the voltage drop amplitude. By adjusting the control mode of SVG, the voltage fluctuation can be quickly suppressed when the voltage fluctuates slightly, and the maximum reactive power regulation capability can be released when the voltage fluctuates greatly, effectively restraining the further deterioration of the voltage. It realizes the actively voltage regulation function under the condition of voltage fluctuation, and ensures the normal operation of the active power of the unit. Finally, the wind farm simulation test model is built based on the RT-LAB platform, which verifies the effect of the proposed method in reducing the frequency of reactive power regulation, improving the reactive power margin and voltage support capability compared with the traditional AVC control strategy. It provides a new solution for realizing actively voltage regulation of wind farms.KeywordsActively voltage regulation of wind farmsVoltage fluctuation trajectory predictionReactive power coordination optimizationVoltage support capabilityMagnitude of voltage drop