DSTATCOM补偿指令电流的新型检测方法

A Novel Method to Detect Reference Compensation Current for DSTATCOM

快速、准确地检测补偿指令电流是提高配电网静止同步补偿器(distribution static synchronous compensator,DSTATCOM)补偿性能的重要环节。在总结现有补偿指令电流检测方法的基础上提出一种新型检测方法。该方法利用基波正序电压提取模块检测出基波正序电压,之后对三相电流进行正余弦变换得到基波正序有功电流,与三相电流相减得到补偿指令电流。检测结果不受电网电压不对称和畸变的影响,无需利用锁相环电路获得同步旋转角,消除了由此带来的延时和误差,减少了硬件成本。仿真和样机实验结果验证了该方法的可行性。

It is an important means for improving the compensation performance of distribution static synchronous compensator（DSTATCOM） to detect the reference compensation current quickly and accurately. On the basis of summarizing existing methods to detect reference compensation current, a novel detection method is proposed. Using fundamental positive sequence voltage extracting module the fundamental positive sequence voltage is detected, and then applying sinusoidal and cosinusoidal transform to three-phase current the fundamental positive sequence current is obtained and subtracting the obtained fundamental positive sequence current from the three-phase current the reference compensation current is achieved. The detection result by the proposed method is not affected by asymmetry and distortion of grid voltage, so it is no longer needed to obtain synchronous rotating angle by phase locked loop circuit, thus the time-delay and error from this are eliminated and the cost for hardware can be reduced as well. Results of Matlab-based simulation and prototype experiments show that the proposed method is feasible.