高压Buck变换器模糊PI混合控制策略的研究

Fuzzy PI Hybrid Control Strategy for High Voltage Buck Converter

针对Buck变换器这种非线性系统,传统PI控制在动态性方面并不理想。提出一种混合控制策略,通过模糊PI控制与PI控制分段对Buck变换器进行调节。以dsPIC33单片机为核心控制器件,搭建了一台2kW的Buck变换器实验平台。实验结果表明,当负载变动时,相较于独立的PI算法,采用混合控制策略系统输出电压波动更稳定、稳态误差有改善、动态性能更好,是一种较理想、可实现的控制算法。

For the nonlinear system of Buck converter,the traditional PI control is not ideal in terms of dynamics.In this paper,a hybrid control strategy is proposed to adjust the Buck converter through the fuzzy PI control and the PI control section.With dsPIC33 single chip microcomputer as the core control device,a2 kW Buck converter experimental platform is built.The experimental results show that when the load changes,compared with the independent PI algorithm,the output voltage fluctuation of the hybrid control strategy system is more stable,the steady-state error is improved,and the dynamic performance is better.It is an ideal and achievable control algorithm.