本文關(guān)鍵詞：基于動(dòng)態(tài)安全域的電力系統(tǒng)重合閘及緊急控制綜合優(yōu)化控制系統(tǒng)　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 動(dòng)態(tài)安全域 重合閘 緊急控制 時(shí)間域 綜合優(yōu)化 角度均勻旋轉(zhuǎn)法

【摘要】：我國(guó)電力系統(tǒng)發(fā)展存在地區(qū)間聯(lián)系單薄、地區(qū)內(nèi)聯(lián)系復(fù)雜、承載功率季節(jié)性變化大、重載時(shí)傳輸功率接近傳輸上線等特點(diǎn)。以上特點(diǎn)的矛盾性使得在進(jìn)行電網(wǎng)暫態(tài)安全相關(guān)計(jì)算時(shí),只有綜合考慮輕重負(fù)荷、疏密連接才能更好的對(duì)控制手段進(jìn)行優(yōu)化。目前,維護(hù)電力系統(tǒng)暫態(tài)穩(wěn)定主要手段為緊急控制及重合閘,其動(dòng)作主要牽涉到以下變量:1)切機(jī)切負(fù)荷量及故障類型(?);2)緊急控制時(shí)間(?);3)重合閘時(shí)間(?);4)故障出現(xiàn)的不同位置集合E_R。對(duì)輸電線路系統(tǒng)的動(dòng)態(tài)安全域研究已有如下經(jīng)驗(yàn)規(guī)律:1.線路故障點(diǎn)變化時(shí)其對(duì)應(yīng)動(dòng)態(tài)安全域超平面具有近似平行性,且有很小的空間夾角θ;2.故障點(diǎn)延線路單向變化時(shí),超平面變化趨勢(shì)相同;3.最優(yōu)重合閘時(shí)間是存在的并且能使得系統(tǒng)的暫態(tài)穩(wěn)定性最好;4.在最優(yōu)時(shí)間重合閘的情況下,有助于系統(tǒng)恢復(fù)功角穩(wěn)定。結(jié)合動(dòng)態(tài)安全域的基本理論及以上已有結(jié)論,本文通過仿真實(shí)驗(yàn)進(jìn)一步探究深化出如下結(jié)論:1.在多擺失穩(wěn)故障中,緊急控制存在最優(yōu)控制時(shí)間,在該時(shí)間點(diǎn)對(duì)系統(tǒng)進(jìn)行切機(jī)切負(fù)荷效果優(yōu)于最快速緊急控制;2.重合閘時(shí)間存在多段優(yōu)化極值區(qū)間,每段極值區(qū)間的底部是平緩的,且全時(shí)間域內(nèi),系統(tǒng)穩(wěn)定性變化基本沒有突變。本文重新提煉系統(tǒng)穩(wěn)定性評(píng)價(jià)標(biāo)準(zhǔn),在基于動(dòng)態(tài)安全域的最優(yōu)緊急控制模型基礎(chǔ)上提出了在多擺失穩(wěn)情況下的考慮控制時(shí)間的改進(jìn)緊急控制模型;提出基于動(dòng)態(tài)安全域的最優(yōu)時(shí)間重合閘計(jì)算方法;同時(shí)探索在實(shí)際應(yīng)用過程中兩者的結(jié)合,形成基于動(dòng)態(tài)安全域的重合閘及緊急控制綜合優(yōu)化方法。該方法在結(jié)合兩大主要控制手段的同時(shí)在時(shí)間域維度上進(jìn)行了較為深入徹底的優(yōu)化,同時(shí)依據(jù)已有的角度均勻旋轉(zhuǎn)法實(shí)現(xiàn)對(duì)不同故障位置的快速推算。本文采用IEEE 4機(jī)11節(jié)點(diǎn)系統(tǒng)及IEEE 10機(jī)39節(jié)點(diǎn)系統(tǒng)算例進(jìn)行說明及驗(yàn)證,結(jié)果表明本文結(jié)論的正確性及綜合優(yōu)化算法的可行性和實(shí)用性。
[Abstract]:In the development of power system in China, there are thin regional connections, complex intraregional connections, and large seasonal variations of the bearing power. The transmission power is close to the transmission line under heavy load. The contradiction of the above features makes it necessary to consider the light and heavy loads when calculating the transient security of the power network. At present, the main means of maintaining power system transient stability are emergency control and reclosing. Its action mainly involves the following variable: 1) the amount of cutting load and the type of fault. Emergency control time? Reclosing time? ; 4) different location sets of faults ESP. The dynamic security domain of transmission line system has been studied as follows: 1.When the fault point of transmission line changes, its corresponding hyperplane in dynamic security domain has approximate parallelism. And there is a very small space angle 胃; 2.When the fault point extension line changes in one direction, the trend of hyperplane variation is the same; 3. The optimal reclosing time exists and makes the transient stability of the system best. 4. In the case of optimal time reclosing, it is helpful to restore the power angle stability of the system. In this paper, through the simulation experiments, the following conclusions are drawn: 1. In the multi-pendulum instability fault, there is an optimal control time in emergency control. At this time point, the load cutting effect of the system is better than that of the most rapid emergency control. 2. There is a multistage optimal extremum interval in reclosing time, and the bottom of each interval is smooth, and in the whole time domain, there is no abrupt change in the stability of the system. In this paper, the evaluation criteria of system stability are rerefined. Based on the optimal emergency control model in dynamic security domain, an improved emergency control model considering control time is proposed in the case of multiple pendulum instability. An optimal time reclosing method based on dynamic security domain is proposed. At the same time, it explores the combination of the two in the process of practical application. A comprehensive optimization method of reclosing and emergency control based on dynamic security domain is formed, which combines the two main control methods and optimizes thoroughly in the dimension of time domain at the same time. At the same time, according to the existing angular uniform rotation method to realize the rapid calculation of different fault locations. This paper uses IEEE 4 machine 11-bus system and IEEE. 10 machine 39 bus system example to explain and verify. The results show the correctness of the conclusion and the feasibility and practicability of the synthetic optimization algorithm.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM762.2

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