基于DFT谐波检测方法的大容量并联型有源电力滤波器的研制

本文介绍了采用多重化主电路设计、基于离散傅立叶变换(DFT)谐波检测方法的100kVA并联型有源电力滤波器的研制情况.文章对并联型有源电力滤波器补偿谐波与无功电流的工作原理进行了分析,论述了选择DFT作为电流检测算法的优点,并对采用二重化方法设计的主电路结构以及相应控制策略的实现方法进行了介绍,最后给出了实验结果.实验证明,该系统满足设计要求,补偿效果良好.

Development of large capacity active power filter based on DFT detection method

In this paper, a system of a 100kVA three phase parallel active power filter with main circuit of multiple performances is introduced, which is based on the DFT (discrete fourier transform) detection method. First, the basic operation principle of the parallel active filter is presented. Then, a digital real time method to detect the harmonic and reactive element in the source current is proposed, which can offer the signal not only of the positive but also of the negative phase sequence content of the fundamental and harmonic current. Third, according to the control requirements the main circuit control method and the control circuit are designed. At last, some experimental results are obtained. The results show that the control system meets the requirements and the compensation performance of the active power filter is very good.