Static var generator（SVG）is a multivariable

strongly coupled nonlinear time-varying system and its dynamic performance can be affected by changes of its own parameters and external conditions by the traditional PI control method and

the control result is affected. In this paper

a kind of variable universe adaptive fuzzy control strategy

based on PI is proposed to achieve automatic perception and adjustment to the external condition by the use of variable universe adaptive fuzzy control. It is used in voltage loop of SVG control system so to realize adaptive and self-adjustment of loop control parameter.Finally

the simulation model is set upon Matlab/Simulink for simulation and verification. The control result by the control strategy and that of traditional PI and fuzzy PI is simulated and compared

showing that the new control strategy proposed in this paper has such features as fast dynamic response and strong anti-interference capability.