This paper discusses the design method of an effective voltage linearity controller of linear load working in AC power networks.

A fuzzy controller is presented to conquer the effects of the parameter-float, non-linearity and coupling in AC servo system by using its independence on the model of objective and good robustness.

In order to solved the problem of ever-increasing during the start period and the non-linearity characteristic, the fuzzy controller based on the slop cut-off negative feedback of stress was proposed.