Taking double stage type three phase photovoltaic grid-connected generation system as the research object, the equivalent model of photovoltaic cells, the maximum power point tracking (MPPT) technology and the control strategy of three-phase grid connected inverter are analyzed in this paper. On the basis of the theoretical analysis, the double closed-loop vector control of the double stage type three-phase grid-connected inverter and the MPPT method based on T-S fuzzy neural network are studied deeply, and the relevant simulation and experimental research are carried out. The experimental results show that the new grid-connected control strategy can make the grid-connected system run with high power factor, high efficiency and low total harmonic distortion, and the grid-to-network voltage and current distortion is low, which proves the effectiveness and feasibility of the control strategy.
