【摘要】：多機(jī)電力系統(tǒng)是一個(gè)由多種電力電子設(shè)備和機(jī)械元器件組成的復(fù)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(yùn)行,以及跨區(qū)域電網(wǎng)的互聯(lián)和電力市場(chǎng)的開放,電網(wǎng)結(jié)構(gòu)及其動(dòng)態(tài)行為日益復(fù)雜,有必要對(duì)其加以控制,以改善其穩(wěn)定性及動(dòng)態(tài)品質(zhì)。研究汽輪發(fā)電機(jī)組的氣門開度控制對(duì)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(shí)際運(yùn)行的電力系統(tǒng)中,被控對(duì)象的各種不確定性導(dǎo)致系統(tǒng)參數(shù)發(fā)生變化,因此,實(shí)際的多機(jī)電力系統(tǒng)難以用精確的數(shù)學(xué)模型來(lái)描述。而且受到周圍環(huán)境和有關(guān)條件的制約,并不是所有的狀態(tài)變量都可測(cè)。此外,各種信號(hào)的采集、處理與傳遞不及時(shí)等因素使時(shí)滯現(xiàn)象普遍存在。基于此,本文主要對(duì)汽輪發(fā)電機(jī)組成的關(guān)聯(lián)多機(jī)電力系統(tǒng)的氣門開度控制問(wèn)題進(jìn)行研究。本文首先給出了多機(jī)電力系統(tǒng)氣門開度控制的動(dòng)態(tài)模型,并針對(duì)實(shí)際電力系統(tǒng)難以用精確的數(shù)學(xué)模型描述的特點(diǎn)對(duì)其建立了模糊模型。研究了多機(jī)電力系統(tǒng)氣門開度的基于觀測(cè)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(shè)計(jì)方法。并在此基礎(chǔ)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(shè)計(jì)方法。在此基礎(chǔ)上,針對(duì)網(wǎng)絡(luò)化互聯(lián)電力系統(tǒng)控制問(wèn)題,考慮實(shí)際運(yùn)行中的網(wǎng)絡(luò)通信協(xié)議、控制區(qū)域間的網(wǎng)絡(luò)通信傳輸處理形式,提出采用網(wǎng)絡(luò)控制先進(jìn)思想,研究了帶有數(shù)據(jù)網(wǎng)絡(luò)傳輸丟包和時(shí)延情況下的互聯(lián)電力系統(tǒng)的網(wǎng)絡(luò)化控制問(wèn)題。并且考慮了網(wǎng)絡(luò)化互聯(lián)電力系統(tǒng)的執(zhí)行器故障控制問(wèn)題,設(shè)計(jì)模糊容錯(cuò)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(shí)變時(shí)滯的多機(jī)電力系統(tǒng)的控制的穩(wěn)定性條件。其中混合時(shí)變時(shí)滯包括區(qū)間時(shí)滯,中立型時(shí)滯和分布時(shí)滯。同時(shí),給出了基于LMI的閉環(huán)系統(tǒng)滿足H∞性能指標(biāo)的魯棒穩(wěn)定性條件。通過(guò)Matlab仿真驗(yàn)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(hào)：2498365