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Impact of Controller Clock Error on Emission in Supraharmonic Caused by Converters

With the use of more and more power electronic devices, the issue of supraharmonics has attracted attention. This paper introduces the impact of the controller clock error on the supraharmonic emission characteristics. There are different clock errors in the controllers of different converters unavoidably, which makes the converters become harmonic sources with different but similar frequencies. Similar frequencies are difficult to distinguish on the frequency spectrum so that beating phenomenon can be observed. It has an impact on the measurement and analysis of supraharmonic emission characteristics. The correctness of analysis was verified by experiments in the laboratory.