基于状态观测器的DC-DC升压变换器反演控制

Backstepping Control of DC-DC Boost Converter Based on State Observer

摘要:

相比于PI控制而言，基于模型的控制具有动态响应速度快的优点，因此被广泛运用于电力电子领域。然而，系统模型参数的不确定会影响系统的鲁棒性。对DC-DC升压变换器的模型而言，输入电压和负载等效电阻是未知的。针对参数未知的问题，Luenberger状态观测器被用来实时估计输入电压和负载等效电阻的真实值。估计出的真实值实时更新到反演法推出的控制律中，控制DC-DC升压变换器的输出跟踪参考电压。最后，Simulink仿真证明了该方法的有效性和鲁棒性。

Abstract:

Compared with PI control, model-based control has the advantage of fast dynamic response, so it is widely used in the field of power electronics. However, the uncertainty of system model parameters will affect the robustness of the system.For the model of DC-DC boost converter, the input voltage and load equivalent resistance are unknown. To solve the problem of unknown parameters, Luenberger state observer is used to estimate the real values of input voltage and load equivalent resistance in real time. The estimated true value is updated to the control law derived by backstepping method in real time to control the output of DC-DC boost converter to track the reference voltage. Finally, Simulink simulation proves the effectiveness and robustness of the method.