Abstract: To solve the problem of bus voltage fluctuations and voltage mismatches between multiple converters caused by load disturbance and line impedance perturbation in multi-inverter parallel systems, this paper proposes a performance improvement control strategy based on residual. First, state space models are developed for the electrical network and the inverters respectively to analyze the voltage fluctuations and voltage mismatches problems. Then, a residual generator-based performance improvement control structure is designed by applying the parameterized residual generator to convert the current disturbance into high-frequency and low-frequency residual signals. Then, a low frequency signal compensation controller is designed based on model matching theory to suppress load disturbances. Meanwhile, the low frequency voltage coordination controller is solved based on the power sharing condition, and optimized using a multi-intelligence consistency algorithm to coordinate the voltage output of multiple inverters. A distributed voltage/frequency secondary control is designed. Finally, the control performance of the system is improved by solving the bus voltage fluctuation and voltage mismatch between multiple converters based on residuals without collecting the inverter output currents, and the effectiveness of the proposed control strategy is verified by experiments.