电力谐波滑窗迭代DFT检测算法的研究与仿真

Study and Simulation of Harmonic Detection Based on Sliding-window Iterative Algorithm of Discrete Fourier Transform

有源电力滤波器的动态补偿要求能够准确、实时地检测出电网中瞬态变化的畸变电流。针对现阶段有源电力滤波器畸变电流检测方法存在工频周期时延、计算量大等不足,提出了一种基于离散傅立叶变换的滑窗迭代DFT(Discrete Fourier Transform,DFT)算法。该方法能有效地提高系统的实时性、目标跟随特性和抗干扰性,并且具有计算量小、容易工程实现的特点。利用MATLAB进行了滑窗迭代DFT仿真实验,实验结果表明该算法的有效性和正确性。

The dynamic compensation of active power filter （APF） demands that variable current in electrical net should be detected exactly and Real-time. To avoid some shortages of current harmonic detection methods of APF, a sliding-window iterative DFT （Discrete Fourier Transform） algorithm was proposed for harmonic reference-current＇s real-time detection, which improved the real-time, tracing, and anti-interference performances with less computation and easy implementation. The algorithm was simulated with MATLAB, and the feasibility of its application was verified experimentally.