Abstract：The selective harmonic mitigation（SHM）PWM has been successfully used in PWM rectifiers of

high power 4-quandrabt 3-level frequency converters. The SHM is an improvement of the well-known selective

harmonic elimination（SHE）PWM，its aim is not to eliminate selective harmonics as the SHE，only to keep all the

harmonic levels under limitation levels of grid harmonic standard. The technique lead to a drastic reduction or

avoidance of the bulky and costly grid connection LC filters. There are less reference materials introducing the

SHM，thus it is unfamiliar. The reasons to improve the SHE，the differences between the SHM and SHE as well as

the results of simulation and tests were shown.

        Key words：selective harmonic mitigation（SHM）；selective harmonic elimination（SHE）；3-level rectifier

     Format Citation:马小亮. 指定谐波消除PWM和指定谐波抑制PWM分析[J].电气传动, 2026,56(10):3-7. MA Xiaoliang. Analysis of selective harmonic elimination（she）PWM and selective harmonic mitigation（SHM）PWM [J].Electric Drive,56(10):3-7