Simulation of Grid-Connected Solar Micro-inverter Based on Fuzzy PI Controller

• DOI: 10.14257/ijca.2014.7.10.18
• Publication Date: 2015-03-10T03:41:24Z
• Authors: Weiliang Liu; Changliang Liu; Huichao Zhang; Yongjun Lin; Liangyu Ma
• Keywords: 0202 electrical engineering, electronic engineering, information engineering; 02 engineering and technology

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. In this paper, small signal analysis model of micro-inverter is established, grid-connected current control strategy composed of fuzzy PI controller and grid voltage feed-forward is put forward, and the initial parameters of PI controller is 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.