基于变结构的协同控制方法及其在DC/DC开关变换器中应用  

Synergetic control based on variable structure and its application in DC/DC converter

作　　者：王前[1] 李韬[1] 

机构地区：[1]华南理工大学电子与信息学院,广东广州510641

出　　处：《电力自动化设备》2010年第4期31-35,共5页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(60572025)~~

摘　　要：为解决滑模控制因开关频率不固定而不能实用的问题,引入协同控制方法并将其应用于DC/DC开关变换器。简要介绍协同控制方法的解析生成过程。利用变结构理论分析协同控制方法的收敛速度以及对外部干扰和内部参数变化的鲁棒性。分析表明,协同控制方法开关频率恒定、容易数字实现和离开流形的动态特性较好;从任意初始状态都能按指数收敛到流形;对满足一定匹配条件的系统内部参数扰动和外部干扰具有不变性。以带恒功率负载的Boost变换器为例,讨论了协同控制器的设计问题,给出该闭环系统的稳定条件,基于稳定条件设置协同控制参数。Simulink仿真结果表明,协同控制器能渐近稳定在目标工作点上,对负载突变和负载功率突变具有较强的鲁棒性。Aiming at the impracticability of sliding-mode control because of its variable switching frequency,the synergetic control is introduced to DC/DC converter.The analytical synthesis procedure of synergetic controller is briefly presented and its convergence speed and robustness against external perturbation and system parameter variation are discussed based on variable structure control theory.The results show that,the synergetic control has constant switching frequency and better off-manifold dynamics,well suitable for digital implementation;the manifolds can be reached from any original states according to exponential term and the invariance against external perturbation and system parameter variation can be obtained when the matching conditions are satisfied.The Boost converter with constant power load is taken as an example,the design of synergetic controller is discussed,the stability criterion of close-loop system is given and the corresponding parameters are set.Simulative results with Simulink indicate that,the synergetic controller is asymptotically stabilized at the objective working point and has robustness against the sudden change of load and load power.

关 键 词：协同控制 DC/DC 变结构 收敛速度 鲁棒性 流形 

分 类 号：TM461[电气工程—电器]