【摘要】：多機電力系統(tǒng)是一個由多種電力電子設備和機械元器件組成的復雜的非線性互聯(lián)大系統(tǒng),隨著高壓直流輸電(HVDC)和柔性交流輸電元件(FACTS)的投入運行,以及跨區(qū)域電網(wǎng)的互聯(lián)和電力市場的開放,電網(wǎng)結(jié)構(gòu)及其動態(tài)行為日益復雜,有必要對其加以控制,以改善其穩(wěn)定性及動態(tài)品質(zhì)。研究汽輪發(fā)電機組的氣門開度控制對于提高電力系統(tǒng)的穩(wěn)定水平有著十分重要的意義,它不僅可以改善電力系統(tǒng)的大干擾穩(wěn)定,還可改善小干擾穩(wěn)定,抑制低頻振蕩等。實際運行的電力系統(tǒng)中,被控對象的各種不確定性導致系統(tǒng)參數(shù)發(fā)生變化,因此,實際的多機電力系統(tǒng)難以用精確的數(shù)學模型來描述。而且受到周圍環(huán)境和有關條件的制約,并不是所有的狀態(tài)變量都可測。此外,各種信號的采集、處理與傳遞不及時等因素使時滯現(xiàn)象普遍存在�；诖�,本文主要對汽輪發(fā)電機組成的關聯(lián)多機電力系統(tǒng)的氣門開度控制問題進行研究。本文首先給出了多機電力系統(tǒng)氣門開度控制的動態(tài)模型,并針對實際電力系統(tǒng)難以用精確的數(shù)學模型描述的特點對其建立了模糊模型。研究了多機電力系統(tǒng)氣門開度的基于觀測狀態(tài)的分散控制,給出了基于線性矩陣不等式(LMI)的系統(tǒng)控制器設計方法。并在此基礎上考慮了系統(tǒng)參數(shù)不確定性情況,提出了魯棒控制器設計方法。在此基礎上,針對網(wǎng)絡化互聯(lián)電力系統(tǒng)控制問題,考慮實際運行中的網(wǎng)絡通信協(xié)議、控制區(qū)域間的網(wǎng)絡通信傳輸處理形式,提出采用網(wǎng)絡控制先進思想,研究了帶有數(shù)據(jù)網(wǎng)絡傳輸丟包和時延情況下的互聯(lián)電力系統(tǒng)的網(wǎng)絡化控制問題。并且考慮了網(wǎng)絡化互聯(lián)電力系統(tǒng)的執(zhí)行器故障控制問題,設計模糊容錯控制器,使閉環(huán)系統(tǒng)在系統(tǒng)執(zhí)行器出現(xiàn)故障情況下仍能保證穩(wěn)定性性能。最后研究了包含混合型時變時滯的多機電力系統(tǒng)的控制的穩(wěn)定性條件。其中混合時變時滯包括區(qū)間時滯,中立型時滯和分布時滯。同時,給出了基于LMI的閉環(huán)系統(tǒng)滿足H∞性能指標的魯棒穩(wěn)定性條件。通過Matlab仿真驗證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，

本文編號：2498365