基于U模型的Buck变换器控制器设计

Design of Controller for Buck Converter Based on U Model

为了提高Buck变换器控制系统的设计精度和效率,对Buck变换器非线性建模及控制器的设计进行了研究。结合U模型不损失NARMAX模型非线性特性且易于设计控制器的特点,提出了一个基于输入输出数据的NARMAX建模方法,根据模型的残差,进行了相关性检验以验证模型的有效性。通过将NARMAX模型转化为U模型并基于U模型设计了Buck变换器的极点配置控制器。仿真结果显示,基于U模型的Buck变换器极点配置控制器在调节时间和超调量控制上优于传统的PID控制器。

In order to improve the design accuracy and efficiency of Buck converter control system,the nonlinear modeling and controller design of Buck converter are studied.Considering that the U model does not lose the nonlinearity of the NARMAX model and is easy to design the controller,a NARMAX modeling method based on input and output data is proposed.According to the residual of the model,the correlation test is carried out to verify the validity of the model.By transforming NARMAX model into U model,the pole placement controller of Buck converter is designed based on U model.The simulation results show that the Buck converter pole placement controller based on U model is superior to the traditional PID controller in regulating time and overshoot control.