基于切换线性系统的dc-dc变换器控制基础理论研究.docx

华南理工大学博十学位论文
明单厨期控弗十在Boost PFc变换器中的适用性,为新型控制理论与技术在变换器中应用的普适性研究提供一种理论分析方法。
。能观性是构造系统状态观溅器,实现系统状态反馈控制的基石。基于切换线性系统的能观性理论,提出 ,; ,提出变换器一个周期之后和多周期的能观性,,为变换器构造状态反馈控制奠定理论基础。
五是Dc—Dc变换器切换线性系统输出能控性理论研究。输出能控性是系统控制理论中的一个重要概念,它是能观性的前提条件和必要条件,也有别于状态能控性。基于切换线性系统输出能控性理论,从系统控制理论的角度提出Dc,Dc 变换器的输出能控性理论,; ,提出变换器一个周期之后和多周期的输出能控性,。理论分析和实验结果均表明,。
。在切换线性系统理论中,切换序列描述了切换模式的演化规律,切换控制器实现了切换序列。目前, 切换控制器的设计已经成为切换线性系统中的一个研究热点,还没有一种通用的设计方法。,利用双线性系统稳定性理论,。双线性Boost变换器作为分析对象,采用新型切换控制器的Boost变换器表现出良好的输出调节特性,仿真分析和实验结果验证了新型切换控制器的有效
·眭。
关键词:切换线性系统;;能控性;稳定性;能观性;输出能控性切换控制器
ABSTRACT
ABSTRACT
Power converters being typical switched nonlinear system,the modeling and analysis always employ the ideas in linear systems for epistemology lim“ation for a 10ng time,which leads to so maIly characteristics unknown for power conVerters. Additionall y’operation performance of power converters is only studied from the viewpoint of topology structure fact,as one kind control system,power converters should be studied f}om the viewpoint of controllability, reachability,
stabilizability, observability and output controllability. In such case, the theory analysis system can be built aⅡd synthesis design approach and optimal control method of power converters could be obtained consequently, with which power electronics discipline pleteness and maturity.
In this dissenation,from the viewpoint of control system deVelopments:linear system to nonlinear system,then to hybrid dynamic system,power conVerters are considered as one kind hybrid dynamic bined cOntinuous state Va“able with discrete switched variable together,that is caned as switched linear system in general. Dc-Dc converters are chosen as research objectiVes inVestigated plete s