Buck变换器非线性控制器设计

Design of nonlinear controller for buck converter

针对Buck变换器的非线性特性,提出了采用反步法和反步滑模法控制非线性系统的控制策略。基于对Buck变换器数学模型的分析,论述了反步法控制器的设计,实现了当Buck变换器参数发生变化时,电容电压和电感电流对给定参考信号较好的跟踪;将反步法与滑模控制相结合,设计了反步滑模控制器,进一步改善了系统的跟踪性能。使用System Generator在Matlab环境下进行系统建模及仿真研究,结果表明,反步法和反步滑模法的非线性系统控制器效果良好。

For the nonlinear characteristics of Buck converter,two control strategies of nonlinear system based on backstepping and backstepping sliding mode method are proposed. Based on the mathematical model analysis of Buck converter, the design procedure of backstepping controller is discussed,which makes the capacitor voltage and inductor current tracing the given reference signals better even when the converter parameters are changing. The backstepping sliding mode controller is also proposed to further improve system performance by combining the backstepping and sliding mode together. Simulation results show that both controllers have better performance.