Research on Composite Control Strategy of Off-Grid PV Inverter under Nonlinear Asymmetric Load

Aiming at the mixed AC load composed of various nonlinear loads and asymmetric loads encountered in photovoltaic inverter application scenarios, this paper takes three-phase four-leg inverter as the research object. After analyzing common PR control and repetitive control, a composite control strategy based on multiple PR control and repetitive control is proposed. Through low-power experiments, the advantages of compound control in steady-state performance and dynamic performance are verified.