Abstract: Voltage regulating systems often uses PID regulation which requires long time to control and has large overshoot.Based on the analysis of the system,a kind of effective  fuzzy controller was designed.Since the regression analysis model is determined by the mathematical function relationship,it is enough to make addition and subtraction,multiplication and division operations,so it can easily be programmed to achieve in microcomputers such as PLC instruction.Through the simulation,the control effect of regression analysis model and fuzzy controller model is basically consistent.

Key words: simulation, PID control, fuzzy control, regression analysis