An independent optical storage power generation system is not connected with the large power grid, and only relies on the system control strategy to ensure power quality. At present, it still has the problems of poor power quality and system instability. In order to improve power quality and enhance the stability of the system, this paper proposes a control strategy based on voltage stabilizing control. For the energy storage system, the voltage and frequency of the system are kept constant before the inverter is adopted, and then the voltage and frequency of the system are kept constant through the double loop control structure of the inverter; the photovoltaic cell adopts MPPT and voltage stabilizing control before the inverter, and uses the PQ control strategy of SVPWM modulation to maintain stable output. The simulation test is carried out in the Matlab/simulink environment to verify the effectiveness of the control strategy. This work is supported by Fundamental Research Funds for the Central Universities (No. 2018ZD01) and Youth Science Fund of National Natural Science Foundation of China (No. 51807059).