基于T-S模糊模型的多机电力系统气门开度的H∞控制方法研究

发布时间：2019-06-13 07:35

【摘要】：多机电力系统是一个由多种电力电子设备和机械元器件组成的复杂的非线性互联大系统,随着高压直流输电(HVDC)和柔性交流输电元件(FACTS)的投入运行,以及跨区域电网的互联和电力市场的开放,电网结构及其动态行为日益复杂,有必要对其加以控制,以改善其稳定性及动态品质。研究汽轮发电机组的气门开度控制对于提高电力系统的稳定水平有着十分重要的意义,它不仅可以改善电力系统的大干扰稳定,还可改善小干扰稳定,抑制低频振荡等。实际运行的电力系统中,被控对象的各种不确定性导致系统参数发生变化,因此,实际的多机电力系统难以用精确的数学模型来描述。而且受到周围环境和有关条件的制约,并不是所有的状态变量都可测。此外,各种信号的采集、处理与传递不及时等因素使时滞现象普遍存在。基于此,本文主要对汽轮发电机组成的关联多机电力系统的气门开度控制问题进行研究。本文首先给出了多机电力系统气门开度控制的动态模型,并针对实际电力系统难以用精确的数学模型描述的特点对其建立了模糊模型。研究了多机电力系统气门开度的基于观测状态的分散控制,给出了基于线性矩阵不等式(LMI)的系统控制器设计方法。并在此基础上考虑了系统参数不确定性情况,提出了鲁棒控制器设计方法。在此基础上,针对网络化互联电力系统控制问题,考虑实际运行中的网络通信协议、控制区域间的网络通信传输处理形式,提出采用网络控制先进思想,研究了带有数据网络传输丢包和时延情况下的互联电力系统的网络化控制问题。并且考虑了网络化互联电力系统的执行器故障控制问题,设计模糊容错控制器,使闭环系统在系统执行器出现故障情况下仍能保证稳定性性能。最后研究了包含混合型时变时滞的多机电力系统的控制的稳定性条件。其中混合时变时滞包括区间时滞,中立型时滞和分布时滞。同时,给出了基于LMI的闭环系统满足H∞性能指标的鲁棒稳定性条件。通过Matlab仿真验证了本文提出方法的有效性。
[Abstract]:Multi-machine power system is a complex nonlinear interconnection system composed of a variety of power electronic equipment and mechanical components. With the operation of HVDC (HVDC) and flexible AC transmission element (FACTS), as well as the interconnection of cross-regional power grid and the opening of power market, the power grid structure and dynamic behavior are becoming more and more complex, so it is necessary to control it in order to improve its stability and dynamic quality. It is of great significance to study the valve opening control of turbogenerator set to improve the stability level of power system. It can not only improve the large interference stability of power system, but also improve the stability of small interference and suppress low frequency oscillations. In the actual operation of power system, the uncertainty of the controlled object leads to the change of system parameters, so the actual multi-machine power system is difficult to be described by accurate mathematical model. And restricted by the surrounding environment and related conditions, not all state variables can be measured. In addition, the acquisition, processing and transmission of various signals are not timely and other factors make the phenomenon of time delay widespread. Based on this, this paper mainly studies the valve opening control of multi-machine power system composed of turbogenerator. In this paper, the dynamic model of valve opening control for multi-machine power system is given, and a fuzzy model is established according to the characteristics that the actual power system is difficult to be described by accurate mathematical model. The decentralized control of valve opening based on observed state for multi-machine power system is studied, and the design method of system controller based on linear matrix inequality (LMI) is given. On this basis, considering the uncertainty of system parameters, a robust controller design method is proposed. On this basis, aiming at the control problem of networked interconnection power system, considering the network communication protocol in operation and the form of network communication transmission processing between control areas, the network control problem of interconnection power system with data network transmission packet loss and delay is studied by using the advanced idea of network control. Considering the problem of actuator fault control in networked interconnected power system, a fuzzy fault-tolerant controller is designed to ensure the stability of the closed-loop system in the event of system actuator failure. Finally, the stability conditions of multi-machine power system with hybrid time-varying delay are studied. The mixed time-varying delays include interval delays, neutral delays and distributed delays. At the same time, the robust stability condition of the closed-loop system based on LMI is given, which satisfies the H _ 鈭，

本文编号：2498365