Abstract：The output current control with LC filter of PV grid-connected inverter (PVGCI) usually adopts linear control strategies in dq or αβ frame. It is difficult to resist adverse effects of uncertain factors produced by internal and external disturbances. As a result, the system has poor robustness. According to the rebuilding of nonlinear mathematical model of PVGCI, a new control method based on nonlinear time-optimal function combined with error feedback is proposed, to realize the rapid tracking of output current without steady state error and enhance the capability of disturbance-rejecting of the whole system. A prototype of three-phase grid-connected PV inverter is designed based on DSP2812. Experiments on this prototype verify the proposed method.
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