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.
基金
Supported by the State Grid of China under Project SGTYHT/16-JS-198.