Development of a Quasi-Pi Fuzzy COntroller based on the Principle of Minimum Guaranteed Phase Margin

摘要

The design principle based on the minimum guaranteed phase margin developed by the authors in is specific to control systems with variable parameters using controllers with dynamics. The quasi-PI fuzzy controller can be considered in the design phase as a nonlinear controller but linearizable in the vicinity of operating points belonging to the control surface. In terms of such an assumption the paper proposes a method for the development of a PI-FC based on ensuring the variation of phase margin within a guaranteed desired interval. Due to the fact the PI-FC parameters are variable with respect to the operating point, a condition for the robust stability of control systems developed by means of the method is derived. The efficiency of the method is exemplified forthe speed control of a DC motor.