互联系统的分散式故障诊断与容错控制设计

发布时间：2019-03-07 15:33

【摘要】：在复杂系统中,可靠性和性能一样重要。故障可能会彻底改变系统行为,从性能降级一直到系统不稳定。容错控制(Fault Tolerant Control,FTC)就是为了达到系统目标,或者当系统目标无法达到时,给定新的(可达到的)目标以避免灾难性的行为发生。对于所有的系统来说,即使是在故障发生时,都能够以一个可接受的性能运行是必要的,互联系统也不例外。本文以互联系统为研究对象,利用分散式的控制结构进行故障的诊断与容错控制设计,对于互联系统的容错控制研究具有重大的指导意义。本课题来源于国家自然科学基金项目,针对互联系统进行分散式的故障诊断与容错控制研究。文中首先回顾了互联系统的故障诊断与容错控制方面的研究现状,给出了针对互联系统的容错控制的相关研究成果,着重介绍了故障、容错控制以及互联系统的相关概念和互联系统的三种主要控制方法:集中式控制方法、分布式控制方法和分散式控制方法。基于现有的相关研究成果,本文研究了一类线性互联系统、一类非线性互联系统的分散式故障诊断与容错控制的相关问题,其中主要包括:(1)一类线性互联系统的分散式故障诊断与容错控制。首先针对线性互联系统,从简单的线性情况出发考虑,在存在过程故障/执行器故障和耦合故障的情况下,设计分散式故障诊断观测器和分散式容错控制器,利用回路小增益原理消除耦合的影响,最终使得系统的状态能够收敛到原点,可以证明整个互联系统最终是稳定的。(2)一类非线性互联系统的分散式故障诊断与容错控制。从线性互联系统的情况推广到非线性互联系统,同样设计分散式故障诊断观测器诊断故障和状态信息,设计分散式容错控制器进行容错控制,利用回路小增益原理消除耦合带来的影响,最终使得系统的状态收敛到原点附近一个任意小的邻域里面,整个互联系统最终得以稳定。最终通过一个三级倒立摆的实例来阐明所设计的容错控制方法的有效性。
[Abstract]:Reliability is as important as performance in complex systems. A failure can revolutionize the behavior of the system, from performance degradation to system instability. Fault tolerant Control (Fault Tolerant Control,FTC) is designed to achieve a system goal, or when a system goal cannot be achieved, a new (achievable) goal is given to avoid catastrophic behavior. For all systems, even in the event of a failure, it is necessary to be able to operate with an acceptable performance, and interconnected systems are no exception. In this paper, the distributed control structure is used to design fault diagnosis and fault-tolerant control for interconnected systems, which is of great significance to the research of fault-tolerant control of interconnected systems. This project comes from the National Natural Science Foundation of China, and researches on distributed fault diagnosis and fault-tolerant control for interconnected system. In this paper, the research status of fault diagnosis and fault-tolerant control for interconnected systems is reviewed, and the related research results for fault-tolerant control of interconnected systems are given, and the faults are emphatically introduced. Fault-tolerant control and related concepts of interconnected system and three main control methods of interconnected system: centralized control method, distributed control method and distributed control method. Based on the existing research results, this paper studies the distributed fault diagnosis and fault-tolerant control of a class of linear interconnected systems and a class of nonlinear interconnected systems. The main contents are as follows: (1) decentralized fault diagnosis and fault-tolerant control for a class of linear interconnected systems. For linear interconnected systems, a decentralized fault diagnosis observer and a decentralized fault tolerant controller are designed for linear interconnected systems in the presence of process fault / actuator fault and coupling fault. Using the loop small gain principle to eliminate the coupling effect, the state of the system can converge to the origin, which proves that the whole interconnected system is finally stable. (2) decentralized fault diagnosis and fault-tolerant control for a class of nonlinear interconnected systems. From the linear interconnected system to the nonlinear interconnected system, the decentralized fault diagnosis observer is designed to diagnose the fault and state information, and the decentralized fault tolerant controller is designed to carry out the fault tolerant control. The principle of loop small gain is used to eliminate the coupling effect, and finally the state of the system converges to an arbitrary neighborhood near the origin, and the whole interconnected system is finally stable. Finally, an example of a three-stage inverted pendulum is given to illustrate the effectiveness of the designed fault-tolerant control method.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273;TP277

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