D-STATCOM一种改进的补偿电流检测法

实时准确地检测出谐波与无功电流是配电网静止同步补偿器(D-STATCOM)进行良好补偿的前提。针对传统的ip-iq法在电压畸变且不对称时不能准确地检测出补偿指令电流,提出了一种无锁相环并适合于非理想电压下改进的ip-iq检测法。该方法通过正余弦信息提取模块计算基波正序电压的正余弦信息来消除锁相环带来的检测误差,并采用平均值滤波和采样优化处理来减少滤波延时和降低检测中的运算量,进而提高检测精度和响应速度。最后在Matlab/Simulink环境中搭建模型进行仿真分析,并研制了一台容量为20kVA的D-STATCOM实验样机,仿真和实验结果证实了所提方法的有效性与可行性。

An Improved Compensation Current Detection Method of D-STATCOM

The ability of detecting harmonic and reactive current in real time and accurately decide the compensation performance of distribution static synchronous compensator(D-STATCOM). Considering ip-iq method can"t accurately detect the compensation command current under distorting and unbalanced voltage,an improved ip-iq detection method without phase-locked loop which is suitable for non-ideal voltage is proposed. The method can eliminate the detection errors that phase-locked loop caused by using sine and cosine extraction module to calculate sine and cosine information of fundamental positive sequence voltage, using mean filter and sampling optimization to reduce filter delay and the amount of calculation in the detection , and improving the detection accuracy and speed of response. Finally results obtained by simulations system built in Matlab /SIMULINK and experiments on a 20kVA D-STATCOM experimental prototype indicate the effectiveness and feasibility of this method.