Broadband Interharmonics Controlling by Synchronous Linear Continuous Phase Modulation for PWM Inverters

This article proposes an interharmonic pulse-width-modulation (PWM) technique, which is based on the linear continuous phase modulations of asymmetrical optimal pulse patterns synchronously. It can move any low-order harmonic component to be a specific interharmonic without any phase angle difference, and does not change other frequency components, improving the output voltage quality. The frequency shift range of harmonic is explored by the switching frequency lower than 1kHz for high power converters of utility application. It is helpful to avoid exciting the LC filter or LCL filter and consequently to prevent interharmonic resonances for power systems with high penetration of inverter-based renewable power generators. Finally, the effectiveness is verified by the experiment results.