基于线性自抗扰的DC/DC升压变换器的控制策略研究

Research on control strategy of DC/DC boost converter based on linear active disturbance rejection

为了改善DC/DC升压变换器的动态性能和抗干扰能力,提出了一种基于线性自抗扰控制(LADRC)的双环DC/DC变换器控制策略.首先,基于状态空间平均法推导出DC/DC升压变换器电压外环和电流内环的传递函数;其次,通过设计线性扩展状态观测器(LESO)和线性状态误差反馈控制律(LSEF)来实时估计和补偿外部的干扰和内部的不确定性;最后,利用仿真实验验证了该控制器的可行性.实验结果显示,该控制器比传统双环PI控制器具有更佳的鲁棒性和自适应性,因此该控制器可用于稳定变压器的直流母线输出电压.

In order to improve the dynamic performance and anti-interference ability of DC/DC boost converter, a control strategy for dual-loop DC/DC converter based on linear active disturbance rejection control(LADRC) is proposed in this paper.Firstly, the transfer functions of the outer voltage loop and inner current loop of the DC/DC boost converter are derived based on the state-space averaging method.Secondly, a linear extended state observer(LESO) and a linear state error feedback(LSEF) are designed to estimate and compensate the external disturbances and internal uncertainties in real time.Finally, the feasibility of the controller is verified by simulation experiment.The simulation results show that the proposed controller has better robustness and adaptability than the traditional double-loop PI controller, so the proposed controller can be used to stable voltage DC output voltage.