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中文摘要：
介绍变频器的结构，在电力系统仿真软件PSIM和Matlab软件下对变频器进行仿真。仿真过程中用图形对比分析了滤波器滤波和电感滤波在2种不同仿真软件中起到的不同作用。介绍了变频器故障产生的机理以及在软件中如何仿真实现。最后用快速傅里叶变换（fast Fouriertrans form，FFT）对仿真出的故障波形进行处理。对比了不同软件仿真出的故障间的差异，说明了变频器故障波形的特点以及由FFT转换波形判断故障位置的方法，以期为后续实现故障智能诊断做好准备。
英文摘要：
The structure of frequency converter is presented. By use the software PSIM and Matlab the simulation of frequency converter is performed. During the simulation, the graphics are used to contrast and analyze the different roles played by normal faults and inductance filter in the simulation based on PSIM and/~atlab. The mechanism causing frequency converter faults and how to reappear them by PSIM and Matlab are presented. Finally, the fault waveforms obtained from the simulation are processed by fast Fourier transform （FFT）, and the differences among the faults simulated by different software are compared to explain the characteristics of waveforms of frequency converter faults and the method to judge faulty position by FFT waveform. The content of this research could be available for subsequent implementation of intelligent diagnosis of frequency converter faults.
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