A Circulating Current Suppression Method for Parallel Inverters Based on Three Vector Model Predictive Control

This paper proposes a novel zero sequence circulating current suppression scheme based on the zero sequence circulating current model of parallel inverters. The proposed method is implemented within the framework of three vector model predictive control (MPC), using a contracted synthetic voltage vector to track the reference current and using zero voltage vector to suppress the zero sequence circulating current, the time occupied by both during the entire switching cycle is adjusted through dynamic control parameters \(\lambda\) . Meanwhile, due to the high reference current tracking accuracy of the three vector model predictive control itself and the inclusion of zero voltage vector in the combined vector, this control method can have lower hardware costs and system volume compared to the method using single vector control. This paper verifies the proposed solution through modeling and simulation, and the experimental results demonstrate its feasibility and reliability.