基于新型模糊PID控制的DC-DC变换器仿真研究

DC-DC功率变换器是一种强非线性系统,传统的PID控制是建立在其线性化小信号模型的基础上进行设计的,虽然算法简单,设计容易,但PID控制器在功率变换器的参数发生变化时并不能相应地改变参数。针对传统PID控制的特点,结合模糊控制不需要建立被控对象精确数学模型的特点,本文提出了一种新型的模糊PID控制器—指数形式模糊PID控制器,并设计了Buck变换器的新型模糊PID控制系统,该控制系统能够根据系统的变化实时地改变控制系统的参数。运用MATLAB/Simulink软件对该变换器系统进行了仿真,仿真结果表明,新型模糊PID控制器有着响应速度快,超调量小,鲁棒性强等特点。

Simulation and Research of DC-DC Converters Based on a Novel Fuzzy-PID Control

DC-DC power converter is a kind of strong nonlinear system.The design of traditional PID controller usually is established based on the system’s linear small signal model.Although its algorithm is simple and design is easy,the PID controller can’t modify its parameters when the converter’s parameters are changed.This paper proposed a novel exponential fuzzy-PID controller to overcome the above disadvantage and the fuzzy control doesn’t need to establish the accurate mathematical model of the controlled object.The novel controller was applied in Buck converter and had detail design process in this paper.The converter was verified in the MATLAB/Simulink software and the simulation results showed that the proposed novel fuzzy PID controller has good characteristics of fast response,small overshoots and strong robustness.