A Modified DPS-PWM Strategy for Parallel Three-Level Inverters to Suppress Circulating Current

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Abstract
This article presents a modified double phase shifted pulse width modulation (MDPS-PWM) strategy designed to suppress circulating current in parallel three-level inverters. In contrast to the double phase shifted pulse width modulation (DPS-PWM), the proposed MDPS-PWM introduces a deliberately chosen phase shift angle for circulating current suppression. By incorporating this targeted phase shift, the strategy effectively reduces the amplitude of the difference in common-mode voltage. This modification leads to a significant decrease in circulating current without compromising the overall output current quality. Furthermore, a sawtooth carrier-based modulation (SCBM) strategy is employed for simplified implementation of carriers. Both simulation and experimental results validate the effectiveness and superiority of the proposed MDPS-PWM method.
Funding Information
  • Major Scientific and Technological Innovation Project of Shandong Province (2024ZLGX04)
  • National Natural Science Foundation of China (62222309)
  • Natural Science Foundation of Shandong Province (ZR2022JQ29)
  • National Natural Science Foundation of China (62203274)

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