本文選題：振蕩 + 失步��； 參考：《華北電力大學(xué)(北京)》2017年碩士論文

【摘要】：解列控制是大規(guī)模電網(wǎng)安全保障體系三道防線中的最后一道防線,當(dāng)電網(wǎng)遭受嚴(yán)重的故障干擾,種種緊急控制措施都無(wú)法避免其暫態(tài)穩(wěn)定性被破壞時(shí),解列控制就會(huì)按照一定的規(guī)則把原系統(tǒng)切割成若干孤島,以避免故障擴(kuò)散到整個(gè)網(wǎng)絡(luò)進(jìn)而引起全系統(tǒng)的崩潰,從而保證大部分負(fù)荷仍然可以得到持續(xù)的電力供應(yīng)。隨著大規(guī)�；ヂ�(lián)電網(wǎng)的建立,緊急解列控制必然會(huì)得到越來(lái)越廣泛的應(yīng)用。本文就二機(jī)系統(tǒng)和三機(jī)系統(tǒng)的失步振蕩中心進(jìn)行定位研究,提出更為完善合理的系統(tǒng)解列策略,取得成果如下:提出考慮線路各點(diǎn)頻率差異的二機(jī)系統(tǒng)失步振蕩中心定位研究方法。假設(shè)頻率沿線路線性分布,基于此構(gòu)建更為精確的阻抗模型,推導(dǎo)母線處的測(cè)量阻抗,借助阻抗復(fù)平面圖賦予振蕩中心概念數(shù)學(xué)意義,同時(shí)可以更直觀、快捷的尋求失步中心,進(jìn)行失步中心定位和振蕩中心漂移分析研究,最后給出失步中心定位判據(jù)以及失步中心時(shí)刻線路兩端發(fā)電機(jī)功角差與180度比較的分析判據(jù)。提出基于多頻環(huán)狀等值三機(jī)系統(tǒng)的失步振蕩中心定位研究方法。推導(dǎo)節(jié)點(diǎn)電壓表達(dá)式,通過(guò)在節(jié)點(diǎn)處構(gòu)建等值虛擬機(jī),將三機(jī)系統(tǒng)轉(zhuǎn)換成三個(gè)二機(jī)系統(tǒng),并通過(guò)比對(duì)三個(gè)等值系統(tǒng)相角差的特征,構(gòu)造系統(tǒng)失步振蕩中心定位判據(jù),在此基礎(chǔ)上,剖析了三機(jī)系統(tǒng)在各種不同調(diào)工況下振蕩中心的漂移規(guī)律,仿真結(jié)果驗(yàn)證了該方法不僅能精確定位環(huán)狀多頻系統(tǒng)振蕩中心,而且能夠明確、合理地闡釋振蕩中心的遷移趨勢(shì)。提出更為完善合理的解列控制策略。一個(gè)完整的解列控制方案,不僅包括電力系統(tǒng)解列斷面的確定,也包括輔助的緊急頻率控制措施以及電壓穩(wěn)定措施。首先基于慢同調(diào)理論進(jìn)行同調(diào)機(jī)群識(shí)別,其次設(shè)計(jì)相應(yīng)的解列控制裝置,最后提出基于改進(jìn)傳統(tǒng)切機(jī)切負(fù)荷策略的輔助穩(wěn)定控制方案,使之不僅能夠滿足系統(tǒng)聯(lián)網(wǎng)運(yùn)行時(shí)在大擾動(dòng)下維持穩(wěn)定的要求,也能滿足系統(tǒng)解列情形下維持穩(wěn)定的要求。
[Abstract]:Decoupling control is the last line of defense in the three lines of defense of large-scale power grid security system. When the power network is seriously disturbed by faults, all kinds of emergency control measures cannot avoid the destruction of its transient stability. In order to avoid the spread of the fault to the whole network and cause the whole system to collapse, the decoupling control will cut the original system into several isolated islands according to certain rules, so as to ensure that most of the load can still be supplied with continuous power supply. With the establishment of large scale interconnected power grid, emergency decoupling control will be applied more and more widely. In this paper, the location of the out-of-step oscillation center of the two-machine system and the three-machine system is studied, and a more perfect and reasonable system de-listing strategy is put forward. The results are as follows: a method for locating the out-of-step oscillation center of two-machine system considering the frequency difference of different points is proposed. Assuming the routing distribution along the frequency line, a more accurate impedance model is constructed, and the measurement impedance at the bus line is derived. With the aid of the impedance complex plane diagram, the concept of the oscillation center can be given mathematical significance. At the same time, the out-of-step center can be found more intuitively and quickly. The analysis and research of out-of-step center location and oscillation center drift are carried out. Finally, the criterion of out-of-step center location and the analysis criterion of the power angle difference between the generator at both ends of the line and 180 degrees are given. A method for locating out-of-step oscillation center based on multi-frequency annular equivalent three-machine system is presented. The expression of node voltage is derived. By constructing the equivalent virtual machine at the node, the three-machine system is converted into three two-machine systems, and by comparing the characteristics of the phase angle difference of the three equivalent systems, the criteria for locating the out-of-step oscillation center of the system are constructed. On this basis, the drift law of the oscillation center of the three-machine system under different operating conditions is analyzed. The simulation results show that the proposed method not only can accurately locate the oscillation center of the annular multi-frequency system, but also can clearly locate the oscillation center of the annular multi-frequency system. The migration trend of the oscillation center is explained reasonably. A more perfect and reasonable decoupling control strategy is proposed. A complete de-listing control scheme includes not only the determination of the decoupling section of the power system, but also the auxiliary emergency frequency control measures and voltage stabilization measures. First, the homology group is identified based on the slow homology theory; secondly, the corresponding de-listing control device is designed; finally, an auxiliary stability control scheme based on the improved traditional load cutting strategy is proposed. It can not only meet the requirements of maintaining stability in the case of large disturbances, but also meet the requirement of maintaining stability in the case of system de-listing.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM712

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本文編號(hào)：2017357