Design and Simulation of Cascade Fuzzy Self - Adaptive PID Speed Control of a Thyristor-Driven DC Motor

Abstract

This paper describes a three-phase full control rectification circuit controller which is widely used in the system of speed regulation of DC motor. Conventional PID controller with double close-loops has been used in speed control of separately excited DC motor at present. But under conditions of actual operation we find that it isn't suitable for the high performance cases, because of the low robustness of conventional PID controller. In order to overcome these problems, we propose the idea of fuzzy self-adaptive PID control method under fuzzy control theory and design a DSP-based cascaded control system to regulate speed of DC motor. The MATLAB 7.0 is used as simulation tool to establish the simulation model and the simulation analysis combined with fuzzy toolbox. It obtains the best parameter through simulation combined with experience and from the simulation result we can see the practicality and validity of this control method and solve the problems mentioned above