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On the basis of photovoltaic power generation system model, the Boost of the dc converter circuit as the research object, first duty ratio were used respectively to a constant pulse width modulation and adjustable duty ratio as the traditional PI control algorithm, using MATLAB/Simulink tool to build the main circuit model, which respectively according to different control methods to Boost circuit simulation analysis. Through simulation analysis, it is found that the parameter Settings of fixed pulse width modulation (PWM) control and traditional PI control cannot adapt to the changes of actual working conditions. Based on this, a fuzzy PI control algorithm is proposed to improve the output voltage of Boost circuit by adjusting the parameters of PI control in real time, so that it can better overcome the adverse influence brought by the change of actual operating conditions. Through simulation analysis, fuzzy PI control can reduce the output voltage overshoot, shorten the system stability time and improve the anti-interference ability of the system.