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Aiming at the problem of high production costs, excessive volume and quality poor of output current of inverters in the traditional inverters and harmonic compensation circuit which is two parallel three-phase voltage type inverters. A kind of inverter and APF harmonic compensation integrated nine-switch topology for the independent power supply is proposed. In order to reduce steady-state error and increase stability, specific PCI control strategy is presented, which can reduce the steady-state error of tracking ac signals. Finally, the simulation results in Matlab/Simulink environment show that this scheme can not only achieve AC signal amplitude and phase zero steady-state error, but also accelerate the dynamic response of the system, and significantly reduce the fluctuation of the current signal. It ensures the steady state and dynamic performance of the system. The harmonic compensation effect is better and reduce THD. Comparison shows that output obtains a stable three-phase sinusoidal AC signal, which confirms the effectiveness of this method.