Abstract: With the emergence of large-scale distributed generation technology,a solution such as virtual synchronous generator（VSG）technology is proposed to support the stable operation of microgrids. Since the voltage-current dual closed-loop control commonly used in VSG has the shortcomings of long dynamic response time and weak perturbation resistance,considering that LADRC has a superior dynamic response speed to perturbations,this paper proposes a linear self-immunity control scheme for the voltage outer-loop control of VSG,and adopts the RBF for the on-line tuning of the key parameters in the LADRC in order to realize the optimization of the controller in real time. The simulation model is built under the MATLAB/Simulink platform and the proposed improved strategy is simulated against the traditional control strategy,and the results show that the strategy can effectively improve the power and frequency stability of the virtual synchronous generator under the grid-connected environment.