Simulation of Grid-Connected Solar Micro-Inverter Based on Fuzzy PI Controller and Feed-Forward Compensation

Abstract

Abstract: Grid-connected solar micro-inverter is a highly nonlinear and time-varying system, so it is difficult to achieve good control effect using traditional PI controller. Small signal analysis model of micro-inverter was established, grid-connected current control strategy composed of fuzzy PI controller and grid voltage feed-forward was put forward, and the initial parameters of PI controller was optimized using the genetic algorithm. Simulation results show that the control strategy has the virtues of good robustness, small dynamic deviation, and could reduce the harmonic content of grid-connected current.

Key words: micro-inverter, PI controller, fuzzy control, feed-forward compensation, genetic algorithm

CLC Number:

TM85

Liu Weiliang, Liu Changliang, Zhang Huichao, Lin Yongjun, Ma Liangyu. Simulation of Grid-Connected Solar Micro-Inverter Based on Fuzzy PI Controller and Feed-Forward Compensation[J]. Journal of System Simulation, 2015, 27(2): 425-431.

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