基于MATLAB中FFT函数在电力谐波分析中的应用  

Application of FFT Function in Power Harmonic Analysis Based on MATLAB

作　　者：郑俊观 王硕禾 ZHENG Jun-guan ,WANG Shuo-he(Shijiazhuang Tiedao University Shijiazhuang Hebei 050043 Chin)

机构地区：[1]石家庄铁道大学电气与电子工程学院,河北石家庄050043

出　　处：《石家庄铁路职业技术学院学报》2018年第1期87-93,共7页Journal of Shijiazhuang Institute of Railway Technology

摘　　要：以电力系统谐波电压或电流为研究对象,得出基于连续信号傅立叶级数的各次谐波系数的计算公式,并推导了该计算公式与MATLAB中FFT函数计算出的谐波系数的关系。最后MATLAB/Simulink中搭建一个仿真电路得到谐波电流数据,利用FFT编写M文件得到频谱图,与powergui模块中FFT Analysis工具得到各次谐波的含量进行比较,证明其正确性。Taking the harmonics voltage or current in power system as the research object, this thesis obtains a calculation formula of the subharmonic coefficient based on continuously-signaled Fourier series, deduces the relation between the calculation formula and the harmonic coefficient calculated by FFT function in MATLAB function. Finally it suggests that an artificial circuit is built in the MATLAB/Simulink to collect harmonic current data, and spectrum diagram is obtained through writing M files with FFT, and the subharmonic contents from the FFT Analysis tools in the powergui module are compared to prove its correctness.

关 键 词：傅立叶级数 MATLAB/SIMULINK 谐波 FFT函数 频谱分析 

分 类 号：TM933.4[电气工程—电力电子与电力传动]