基于扩张状态观测器补偿的Boost变换器无源控制

Passivity-based Control of Boost Converter Based on Extended State Observer Compensation

针对Boost变换器受到未知扰动时存在稳态误差的问题,本文采用一种基于扩张状态观测器的无源控制策略进行改进。首先,对Boost变换器建立欧拉-拉格朗日模型,采用阻尼注入的方法设计无源控制器,并通过扩张状态观测器对未知扰动进行观测和补偿。然后,搭建基于扩张状态观测器补偿的无源控制仿真模型,并与传统无源控制和PI控制进行比较。最后,经过仿真结果验证了基于扩张状态观测器补偿的Boost变换器无源控制策略可以抑制由未知扰动产生的系统稳态误差,与PI控制相比具有更好的动态性能,与传统无源控制相比具有更好的稳态性能。

To solve the problem of steady-state error of a Boost converter under unknown disturbance,a passivity-based control(PBC)strategy based on extended state observer(ESO)is improved in this paper. The Euler-Lagrange(EL)model of the Boost converter is established,and a passivity-based controller is designed using the damping injection method. In addition,the unknown disturbance is observed and compensated by the ESO. A simulation model of PBC based on ESO compensation is built,which is compared with the traditional PBC and PI control. Simulation results show that the PBC strategy for Boost converter based on ESO compensation can suppress the steady-state error of the system caused by unknown disturbance. It has a better dynamic performance compared with PI control and a better steadystate performance compared with the traditional PBC.