半周期滑窗迭代DFT检测谐波和无功电流  

Harmonic and Reactive Current Detection Based on Half Cycle and Sliding-window Iterative Algorithm of DFT

作　　者：张杰成[1] 乔鸣忠[1] 朱鹏[1] 马战毅 

机构地区：[1]海军工程大学,电气工程学院,湖北武汉430033

出　　处：《电力电子技术》2015年第4期97-100,共4页Power Electronics

基　　金：国家自然科学基金(51007094)~~

摘　　要：电力系统谐波检测中离散傅里叶变换(DFT)由于具有检测精度高、实现简单、抗干扰能力强、易于工程应用等优点而得到广泛应用。在此基础上利用基波正序电压相位得到功率因数角并加入滑窗迭代思想,提高谐波检测实时性和目标跟随性。根据电力系统中偶次谐波和DFT的特性,证明了半周期傅里叶变换的可行性,进一步减小了计算量,将检测时间缩短为原来的一半,显著提高了检测速度。仿真和实验结果表明,该谐波检测方法在特定场合稳态精度高、动态性能好、抗干扰能力强。Discrete Fourier transform（DFT） is widely used for harmonic detection in power system because of high pr- ecision,simple implementation and advantages of strong anti-interference ability.On this basis,the phase of fundamen- tal positive sequence voltage is used to calculate the power factor angle, and the ideas of sliding-window iteration is proposed which improves the realtime and tracing performance.According to the characteristics of even order harmonic in power system and characteristics of DFI＇, the feasibility of half cycle Fourier transform is proved, which further re- duces the amount of calculation, shorten test time to half the cycle.Simulation and experimental results indicate that the method has high stable precision, fast dynamic response, and strong anti-interference ability in specific occasions.

关 键 词：谐波检测 功率因数角 滑窗迭代 

分 类 号：TM93[电气工程—电力电子与电力传动]