改进的FFT在电能质量监测系统中的应用

Improved FFT was applied in monitoring system of power quality

随着社会的发展,电能质量问题越来越受到关注。可以及时、详细、精确地掌握电力系统电网的电能质量状况,正确、合理地评估电网的电能质量水平显得尤为重要。本文采用改进的FFT对电力系统谐波进行分析,同时采取加窗、插值修正算法等配套措施,可以防止频谱泄漏,实时精确地计算谐波频率相位和幅值。仿真结果验证此方法的可行性。

With the development of the society, the problem of power quality has been become more and more concerned. Can be timely and correctly grasp the grid power quality power system status, and correctly and reasonably assess the level of the grid power quality is particularly important. In this paper, the improved FFT was applied in the analysis of power system,while taking additional windows interpolated and other supporting measures to prevent spectral leakage, and it canaccurately calculate the phase and amplitude of harmonic frequencies in real-time. Simulation results show the feasibility of the method.