The ordinary elevator drive can not back renewable energy shortcomings, designed a grid-connected inverter, the renewable energy into electrical energy back to the grid. The feedback system uses repetitive control of grid voltage feedforward control strategy. To verify the proposed algorithm. Structures and network-based inverter system TMS320F2812 experimental model results show that the system has high power factor, fast dynamic response, robust performance, anti-interference ability, etc., can be effectively regenerated braking energy back to the grid, achieve energy saving, application of good prospects.