基于CESO的SIDO Buck-Boost变换器自抗扰控制策略

Active Disturbance Rejection Control Strategy of SIDO Buck-Boost Converter Based on CESO

针对单电感双输出Buck-Boost变换器两输出支路va和vb间存在交叉影响,暂态性能差等问题,提出一种基于级联扩张状态观测器(CESO)的自抗扰控制(ADRC)策略.首先,根据ADRC理论将主路和支路分别拟合为相互独立的系统,减少支路间的交叉影响;其次,设计CESO对系统总扰动进行估计,消除因传统扩张状态观测器不完全估计而造成的观测残差,并利用CESO对电路传感器高频噪声的抑制作用,进一步提高观测值的估计精度;然后,将观测值作用于ADRC的状态误差反馈控制率,以提高系统的暂态性能;最后,利用Lyapunov理论证明了控制系统的闭环稳定性.仿真结果表明:本文所提控制策略有效减小了两输出支路va和vb间的交叉影响,同时提高了系统的暂态性能.

Aiming at the problems of cross-influence between the two output branches va and vb of the singleinductor dual-output Buck-Boost converter and poor transient performance,an active disturbance rejection control(ADRC) strategy based on cascaded extended state observer(CESO) is proposed.First,according to the ADRC theory,the main road and the branch roads are fitted as independent systems to reduce the cross-influence between the branches.Secondly,CESO is designed to estimate the total disturbance of the system to eliminate the observation residual error caused by the incomplete estimation of the traditional extended state observer,CESO is also used to suppress the high-frequency noise of the circuit sensor to further improve the estimation accuracy of the observed value,and then the observed value acts on the state error feedback control rate of ADRC to improve the transient performance of the system.Finally,the closed-loop stability of the control system is proved by the Lyapunov theory.The simulation results show that the control strategy proposed in this paper effectively reduces the cross-influence between the two output branches va and vb,and improves the transient performance of the system at the same time.