For obtaining and stable DC-side voltage of the interconnected Z source inverter photovoltaic（PV）system

a fuzzy PID control method is used to quickly response the changes of the PV array output power and voltage

then the fuzzy controller performs fuzzy reasoning

and the output is multiplied by the scaling factor to convert into the variation of the PID controller’s proportional integral differential coefficient. Thus

the unified control of MPPT and the voltage regulation at DC side are achieved

but also inhibited the DC voltage disturbances effectively. The results show that when outside disturbance to the DC link voltage exists

the proposed control strategy can rapidly recover the link voltage with nice grid-connecting current tracking performance. It is concluded that this fuzzy PID control strategy can ensure the stability of DC-side voltage

and realize the maximum power point tracking. Simulation verifies the effectiveness of this method.