本文選題：網(wǎng)絡切換控制 + 分布式電源��； 參考：《蘭州理工大學》2017年碩士論文

【摘要】：分布式發(fā)電系統(tǒng)的出現(xiàn)不但節(jié)省了輸變電投資、提高了供電網(wǎng)絡的可靠性,也為偏遠地區(qū)用戶提供了方便,我國電網(wǎng)產(chǎn)業(yè)未來的發(fā)展趨勢將是走以大電網(wǎng)供電為主分布式電源發(fā)電為輔,多種供電方式相結(jié)合的發(fā)展道路。可隨著接入主配電網(wǎng)的分布式電源數(shù)量急劇增加,一些問題也變得不可避免。例如分布式發(fā)電系統(tǒng)接入后提升了系統(tǒng)整體復雜性和不可預測性,這對二次設備和通訊設施提出了新的要求。所以分布式電源在給人們生活帶來方便的同時,也不可避免的為能源利用提出了新的挑戰(zhàn)。因此,在高速發(fā)展分布式發(fā)電的同時,還需要同步提高對分布式電網(wǎng)整體遠程監(jiān)控的技術水平。主電網(wǎng)與分布式電源間的平穩(wěn)切換是分布式電源為大電網(wǎng)提供補充和保障大電網(wǎng)自身安全的前提,也是保證分布式電源最大限度發(fā)揮自身優(yōu)勢的基礎。本文從切換控制角度出發(fā),將分布式電源兩種運行模式看作是切換控制系統(tǒng)的兩個子系統(tǒng),結(jié)合網(wǎng)絡化控制系統(tǒng)(Networked Control Systems,簡稱NCS)的相關知識對分布式電源的遠程切換控制問題進行分析和研究。對于網(wǎng)絡控制所存在的固有問題本文在考慮網(wǎng)絡通信受限的基礎上為了更加貼合工程實際,同時又考慮了切換時延和子系統(tǒng)不穩(wěn)定情況,研究了在多種條件共同限制下的系統(tǒng)穩(wěn)定性和控制器設計問題。本文的研究工作如下:(1)分布式電源并離網(wǎng)數(shù)學模型的建立。首先對現(xiàn)有主流分布式電源作以介紹,分析了風能、太陽能、燃料電池的結(jié)構特性和并網(wǎng)影響。然后簡介了分布式電源遠程控制的結(jié)構和遇到的問題。最后通過分布式電源并網(wǎng)模式和孤島模式下的拓撲關系推導出兩種模式下的系統(tǒng)狀態(tài)空間模型,為下一步工作打下基礎。(2)通信受限和切換時延共同影響下的分布式電源切換控制研究。在現(xiàn)有的通信控制技術研究基礎之上將NCS與切換控制系統(tǒng)相結(jié)合形成一類新系統(tǒng)—網(wǎng)絡切換控制系統(tǒng)(Networked Switched Control Systems,簡稱NSCS)。當網(wǎng)絡引入后由于網(wǎng)絡帶寬等因素的限制,通信受限和時延變得不可避免,兩者的存在將會影響系統(tǒng)的穩(wěn)定性,對于這部分工作,本文基于平均駐留時間(Average Dwell Time,簡稱ADT)的概念和通信序列的處理方法及利用李雅普諾夫(Lyapunov)穩(wěn)定性理論、線性矩陣不等式(LMI)等概念分析研究了系統(tǒng)控制器的設計方法和有限時間穩(wěn)定的條件。最后通過數(shù)值仿真檢驗結(jié)果的正確性和有效性。(3)子系統(tǒng)不穩(wěn)定下的分布式電源切換控制研究。子系統(tǒng)不穩(wěn)定是造成工業(yè)系統(tǒng)失穩(wěn)的重要因素,為了更加貼合工程實際,這部分研究內(nèi)容基于平均駐留時間、總駐留時間的思想設計切換控制策略,研究子系統(tǒng)不穩(wěn)定下的系統(tǒng)整體穩(wěn)定性問題。最后通過兩組算例驗證了本章結(jié)論的正確性。通過把分布式電源并網(wǎng)與孤島模式轉(zhuǎn)換看做是一類特殊的切換系統(tǒng),將網(wǎng)絡切換控制系統(tǒng)研究所得結(jié)論與分布式電源的遠程切換控制相結(jié)合,為實現(xiàn)廣域分布式電源的遠程互聯(lián)互通和微電網(wǎng)并網(wǎng)和孤島模式間平滑穩(wěn)定的切換提供了理論支持。
[Abstract]:The emergence of the distributed generation system not only saves the investment and transformation investment, improves the reliability of the power supply network, but also provides convenience for the users in the remote areas. The future development trend of the power grid industry in China will be the development road of combining the large grid power supply with distributed power generation as the main power generation and the combination of various power supply modes. The number of distributed power sources in the power grid has increased rapidly, and some problems have become inevitable. For example, the distributed generation system has increased the overall complexity and unpredictability of the system, which puts forward new requirements for the two equipment and communication facilities. Energy utilization has put forward new challenges. Therefore, while developing distributed generation at high speed, it needs to improve the technical level of the remote monitoring of distributed grid as a whole. The stable switching between the main and the distributed power sources is the prerequisite for the distributed power supply for the large grid and the security of the large power grid itself, as well as the guarantee for the distribution of the power grid. From the angle of switching control, this paper regards the two operating modes of the distributed power supply as the two subsystems of the switching control system from the angle of switching control, and divides the remote switching control problem of the distributed power supply with the related knowledge of the networked control system (Networked Control Systems, short for short). For the inherent problem of network control, this paper studies the stability of the system and the design of the controller under the common restriction of a variety of conditions on the basis of considering the limited network communication to fit the engineering practice and considering the switching delay and the instability of the subsystems. (1) a mathematical model of distributed power supply and off network. First of all, the current mainstream distributed power is introduced, the structure characteristics of wind energy, solar energy and fuel cell are analyzed. Then the structure and problems of distributed power remote control are briefly introduced. Finally, the distributed power grid mode and the island mode are introduced. The topology relation derives the system state space model under two modes, which lays the foundation for the next work. (2) the study of distributed power switching control under the common influence of communication constraints and handoff delay. On the basis of the existing communication control technology research, the NCS and switching control system are combined to form a new system of network switching. Networked Switched Control Systems (NSCS). When the network is introduced because of network bandwidth and other factors, communication constraints and delay become inevitable, the existence of both will affect the stability of the system. For this part of the work, this paper is based on the concept of the mean standing time (Average Dwell Time, short for short). The processing method of the signal sequence and the use of Lee Yap Andrianof (Lyapunov) stability theory, linear matrix inequality (LMI) and other conceptual analysis are used to study the design method of the system controller and the conditions of the finite time stability. Finally, the correctness and effectiveness of the results are tested by numerical simulation. (3) the switching control of the distributed power supply under the instability of the subsystem. System instability is an important factor in the instability of the industrial system. In order to fit the engineering practice more, this part of the study is based on the thought design switching control strategy based on the average standing time and the total resident time. The system stability problem under the subsystem instability is studied. Finally, the chapter is verified by two groups of examples. The correctness of the theory is that the distributed power grid and island mode conversion are regarded as a special type of switching system. The conclusion of the network switching control system is combined with the remote switching control of the distributed power supply, so as to realize the remote interconnection and intercommunication of the wide area distributed power supply and the smooth stability between the microgrid connected network and the island mode. The handover provides theoretical support.

【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM61

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