有源电力滤波器的谐波提取演算法研究

谐波电流参考信号的产生是保证有源滤波器补偿精度和性能的关键。本文在并联型有源电力滤波器的哎计中，采用基于滑动平均滤波器的id—iq算法提取正序及负序无功功率，采用基于滑动平均算法的DFT实现对谐波电流的提取，并住此基础上提出了频率自适应算法。针对殴备运行过程中的保护问题，采用RMS限流与峰值限流相结合的限流策略，以实现对设备的保护。仿真与实验结果，很好的验证了所提出算法的止确性，适合存APF工程实践应用。

Algorithm Research on Harmonic Extraction of Active Power Filter

The production of the reference signal of harmonic current is the key to ensure compensational precision and performance of APF （active power filter）. In this paper, in the design of shunt APF, id-iq algorithm based on moving-average filter is adopted to extract positive-sequence and negative-sequence reactive power, and DFT based on moving-average algorithm is adopted to extract harmonic current, based on which frequency adaptive algorithm is presented. As for the protection in the process of equipment operation, current- limiting strategy combining RMS current limit with peak current limit is used to realize the protection of equipment. The simulation and experimental results well verify the accuracy of the mentioned algorithm, suitable for the practical application of APF project.