Regarding at the problem of inadequate adaptive regulation ability of traditional control strategy of SVG, the traditional control strategy is improved. On the basis of inner loop decoupling control, fuzzy control is introduced to adjust PI parameters adaptively to improve the compensation accuracy of SVG. The traditional fuzzy PI control takes the initial PI parameters as the center and adjusts up and down, and the adjusting range is limited. Aiming at this problem, the method of accumulating PI parameters is proposed to increase the adjusting range. According to the changing system, not only the initial values but also the last moment values is not as the referring values during adjusting the parameters. And the PI parameters are adjusted adaptively according to the change of error signal. The simulation results show that compared with the existing control strategies, the compensation accuracy is further improved and the dynamic performance of the system is enhanced.