基于输出反馈的Buck-Boost变换器微分无源控制

Differential Passivity Control of Buck-Boost Converter Based on Output Feedback

解决直流微电网中含有恒定功率、电流、阻抗的Buck-Boost变换器的电压调节问题。基于无源性理论,通过建立其增广系统,设计状态反馈控制器使输出电压稳定在期望电压。为避免使用电流传感器,基于参数估计的方法,设计电流观测器在线估计电感电流。针对闭环系统,严格证明其是全局渐近稳定的。仿真研究验证了所提出控制器的可行性。

This work mainly solves the voltage regulation problem of Buck-Boost power converter with constant power, current and impedance in DC Microgrids. Firstly, based on the passivity theory, the state feedback controller is designed to stabilize the output voltage at the desired voltage by establishing the augmentation system. Secondly, in order to avoid the use of current sensor, based on the method of parameter estimation, the current observer is designed to estimate the inductive current online. Finally, it is strictly proved that the closed-loop system is globally asymptotically stable. The simulation results verify the feasibility of the proposed controller.