基于自整定模糊PID控制的Buck变换器设计与仿真

DC-DC功率变换器在各个领域应用广泛,工业应用中大多采用PID控制。尽管PID控制具有结构简单、鲁棒性和可靠性高等特点,但PID参数不能随系统内部参数的变化而自行调整,导致无法达到最优控制。为此,设计一种基于模糊控制理论的、可在线自整定参数的PID算法,并用Matlab2012对典型Buck变换器和模糊自整定PID算法仿真。结果表明:模糊PID控制器既可实现高精度、高鲁棒性控制,又能完成PID参数的在线自整定。

Design and Simulation of Buck Converter Based on Fuzzy PID Control

The PID controller’s structure is simple and has some characteristics of strong robustness and high reliability, but it cannot adjust PID parameters along with the change of interior parameters of the system, so that it cannot achieve optimal control. Aiming at this problem, we design a kind of PID control algorithm based on fuzzy control theory whose parameters can be self-tuning on line. The algorithm for the typical Buck converter is simulated by using Matlab2012. The simulation results show that the fuzzy PID controller can not only achieve high accuracy and high robustness control, but also can self-tuning PID parameters online.