Periodic Variation in the Effect of Switching Frequency on the Harmonics of Power Electronic Converters

• 来源期刊: 中国电气工程学报（英文）
• 年，卷（期）: 2020,（3）
• 所属期刊栏目: Special Issue Papers
• 页码范围: 35-45
• 页数: 11页
• 语种: 英文
• DOI: 10.23919/CJEE.2020.000017

摘要

Switching frequency is an important factor in the performance control of power electronic converters.It can help optimize switching losses,switching ripples and electromagnetic interference,especially for newly developed high-switching-frequency silicon carbide converters.Periodic variation in the switching-frequency methods has been developed for this purpose,especially the model-predictive variable switching-frequency pulse width modulation (VSFPWM) method.The effect of periodic switching-frequency variation on the harmonics of a converter using double Fourier analysis and simulations are investigated.This work verifies that the switching harmonics can be reduced by periodic variation in the switching frequency,and the low-frequency (baseband) harmonics only incur a slight change.The analysis provides a theoretical foundation for the application of VSFPWM in power electronic converters.