Analysis of the Supraharmonic Characteristics of VSR PWM Converter

With the development of power electronic technologies, the high-frequency switching harmonics (commonly referred to as supraharmonics) derived from PWM converters are constantly advancing towards higher frequency in power distribution grid, which has caused many new power quality problems. In this paper, a typical single-phase half-bridge VSR converter and its several parallel modes are taken as examples to systematically analyze the supraharmonic features, considering such influence factors as sampling method, carrier phase shifting, dead zone and PWM control strategies, for the purpose of providing references for the relevant research on the propagation, measurement and suppression of supraharmonics. Through the mathematical modeling and simulation analysis, some primary conclusions of the supraharmonic distribution and variation characteristics are drawn under these factors above.