新型煤矿电网D-STATCOM电流检测方法

针对煤矿电网无功补偿技术方面的难点,即传统的p-q电流检测法应用于三相不平衡电网以及电网电压畸变时存在的误差,提出一种新型的电流检测方法。该检测法通过在电网后面接入一个正序电压检波器检测输出三相对称正序电压来代替实际电网中的三相电压。此种方法能够精确地确定正序电压V′的相角和频率从而能够实现基波正序电流无功分量的精确检测,达到STATCOM对负载端电流谐波和无功并补的功能。

New D-STATCOM Current Detection Method in Coal Mine Grid

According to difficulties of reactive compensation technology in coal mine grid,as p-q detection method has errors when used in three-phase unbalanced power or having voltage distortion,this artical gave a new detection method.The detection method accessed a positive sequence voltage detector to grid to detect output positive sequence three-phase voltage instead of actual three-phase grid voltage.This method can accurately determine phase angle and frequency of positive sequence voltage in order to accurately detect reactive component of fundamental positive sequence current,which enabled complement function of STATCOM for load side harmonics and reactive current.