Abstract：Establishing mathematical model of three-phase inverter with voltage current double loop control based on space vector pulse width modulation ( SVPWM) , a novel current scheme under two phase synchronous rotating frame is presented, which uses a grid feed forward controller. considering the efficiency of photovoltaic modules, an improved maximum power point tracking algorithm is utilized. The simulation results show that the off-grid inverter outputs stable current, and smaller waveform distortion; and that the photovoltaic system has good dynamic performance and tracking results. When the load changing, the system can always maintain a constant output voltage.

Keyword：inverter;space vector pulse width modulation (SVPWM) ;photovoltaic;maximum power point tracking (MPPT) ;