The conventional automatic control method for low-voltage ride through of rectifiers mainly relies on AC side power control,which cannot meet the demand for fast balance of DC side voltage.Therefore,an automatic control method for low-voltage ride through of three-phase rectifiers under voltage drop was designed.This method can track the voltage phase of the power grid,and based on the principle of self coupling voltage regulation,perform self coupling voltage regulation on the low-voltage ride through of the rectifier.Calculate the reference value of reactive power on the fixed value side,control the voltage threshold of the rectifier's low-voltage trip through the grid connection point,so that the voltage at the grid connection point is always controlled within a reasonable range,and achieve automatic control of the low-voltage ride through of the three-phase rectifier under voltage drop.Through comparative experiments,it was verified that the proposed method has almost the same voltage at the grid connection point as the baseline voltage,indicating that the low breakdown automatic control effect is good and can ensure stable operation of the grid connection.
关键词
自耦调压/整流器/低电压穿越/自动控制方法/电压跌落/定值则
Key words
self autocoupling voltage regulation/rectifier/low-voltage ride through/automatic control methods/voltage drop/fixed value side
维普
万方数据