改进滑模控制双降压式逆变器的动力学特性

Dynamics Characteristics of Dual-buck Inverter Under Improved Sliding Mode Control

本文将改进指数趋近律滑模控制引入到双降压式逆变器中,并对其动力学特性进行研究。首先,基于系统的工作原理,建立了系统的离散数学模型;其次,结合多种数值仿真方法描述了随控制参数变化系统由稳定到不稳定状态的演变过程,并得到控制参数的稳定工作域;然后,利用分岔图研究了外部参数对系统稳定性的影响;最后,利用快变稳定性定理进行理论分析。本文研究为改进指数趋近律滑模控制双降压式逆变器的设计和调试提供一定的理论依据。

The sliding mode control based on improved exponential approach law was introduced into a dual-buck in⁃verter,and its dynamics characteristics were investigated.First,a discrete mathematical model of the system was estab⁃lished based on its operating principle.Next,the evolution of the system from a stable state to an unstable one with the change in control parameters was described by combing multiple numerical simulation methods,and the stable working domain of control parameters was obtained.Then,the influence of external parameters on the system stability were stud⁃ied by using bifurcation diagrams.Finally,a theoretical analysis was performed using the fast-scale stability theorem.This study provides a theoretical basis for the design and commissioning of dual-buck inverter under sliding mode con⁃trol based on the improved exponential approach law.