The inverter parallel system composed of traditional droop control system is prone to oscillate when it is disturbed, and the stability of the system is easily affected when the load changes violently. The low pass filter introduced in the power calculation can increase the system inertia and delay the system response speed. In the traditional control method, the following two items are added: power differential term and primary function term (power and droop control coefficient). The power differential term can significantly improve the stability and dynamic response performance of the system, and the primary function term can effectively realize the adaptive adjustment of the droop factor with the power change.