A Single-Phase Grid-Connected Inverter System With Zero Steady-State Error

A single-phase grid-connected inverter system with a novel current control strategy is presented in this paper. The controller consists of a proportional regulator and a new type of resonant regulator. Compared with traditional PI control methods, the P+resonant (PR) control can introduce an infinite gain at the fundamental frequency and hence can achieve zero steady-state error. A more practical quasi-PR controller is used based on theoretical analysis. In this paper, a step by step procedure for designing the quasi-PR controller is proposed and verified by experiments. Theoretical analysis and experimental results of an experimental prototype verified the high performance of the proposed system in both the sinusoidal reference tracking and the disturbance rejection

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