Abc-frame complex-coefficient filter and controller based current harmonic elimination strategy for three-phase grid connected inverter

摘要

Current quality is one of the most important issues for operating three-phase grid-connected inverter in distributed generation systems. In practice, the grid currentquality is degraded in case of non-ideal utility voltage. A new control strategy is proposed for the three-phase gridconnected inverter. Different from the traditional method,our proposal utilizes the unique abc-frame complex-coefficient filter and controller to achieve the balanced, sinusoidal grid current. The main feature of the proposedmethod is simple and easy to implement without any frame transformation. The theoretical analysis and experimental test are presented. The experimental results verify theeffectiveness of the proposed control strategy.