静止同步补偿器补偿指令电流的改进检测方法

Improved detection method of reference compensation current for STATCOM

快速、精确地检测补偿电流是提高静止同步补偿器(DSTATCOM)补偿性能的重要环节之一。传统补偿电流检测在信号不对称及畸变情况下会引入测量误差。在总结了现有补偿电流方法的基础上提出了一种改进的无锁相环(PLL)电流检测方法。该方法通过三相正序电压计算以取代锁相环,解决了传统锁相环引入的相角误差,并引入均值滤波器以及反馈环节以减小延时。仿真结果验证了该改进检测方法的有效性。

Detecting the reference compensation current quickly and accurately is one of the most important elements for improving the compensation performance of distribution static synchronous （DSTATCOM）. Traditional compensation current detection ulader the condition of asymmetric signals and distortion will introduce measurement errors, On the basis of summarizing existing compensation current detection methods, this paper proposed a method without phase lock loop （PLL）. This method replaced the phase lock loop through the calculation of three-phase positive sequence voltage, which solved the problem of phase angle error introduced by PLL, and introduced the mean filter and feed-back loop to reduce the delay. The simulation results verify the effectiveness of the improved detection method.