【摘要】：隨著工業(yè)化、現(xiàn)代化水平的提高,京津唐、珠三角、長三角地區(qū)逐步形成了一系列特大型城市和重負荷中心。這些區(qū)域具有外受電比例大,無功設(shè)施建設(shè)相對不足,電網(wǎng)有功承載能力有限的特點,電壓穩(wěn)定性問題較為嚴重。電力系統(tǒng)電壓穩(wěn)定性分析指標可以用于對電網(wǎng)的電壓穩(wěn)定性進行評估,并能夠?qū)﹄娋W(wǎng)系統(tǒng)中的薄弱區(qū)域進行辨識�；谥笜擞嬎憬Y(jié)果,可以在電網(wǎng)中加裝無功補償來提高關(guān)鍵節(jié)點或區(qū)域的電壓穩(wěn)定性。因此,合理的電力系統(tǒng)電壓穩(wěn)定性分析指標,具有一定的工程應(yīng)用價值。本文對電力系統(tǒng)電壓穩(wěn)定性分析指標進行了研究。按照靜態(tài)指標和暫態(tài)指標兩類,在已經(jīng)提出的指標的基礎(chǔ)上進行改進,提出了一些適用性和準確性更強的新的指標,并在算例系統(tǒng)對所提出指標的數(shù)值進行計算和對比分析。然后根據(jù)指標計算結(jié)果提出無功補償配置方案,并與其他配置方案進行對比,研究各種指標在引導(dǎo)動態(tài)無功補償配置方面的應(yīng)用效果。主要包括如下內(nèi)容:(1)對工程中常用的靜態(tài)電壓穩(wěn)定指標中的阻抗模裕度指標和靈敏度指標的原理進行了分析,并提出了一種基于網(wǎng)絡(luò)導(dǎo)納矩陣的靜態(tài)電壓穩(wěn)定指標——電壓關(guān)聯(lián)裕度指標。以北京現(xiàn)狀電網(wǎng)為例,對三種靜態(tài)電壓穩(wěn)定性指標的數(shù)值進行了計算和對比分析,并基于有功裕度驗證了這三種靜態(tài)電壓穩(wěn)定性指標對薄弱節(jié)點和薄弱區(qū)域的評估能力。(2)對于大比例受端系統(tǒng),介紹了一種基于時域仿真的暫態(tài)電壓穩(wěn)定指標——電壓跌落面積指標;對于多直流饋入系統(tǒng),分析并完善了一種考慮動態(tài)元件的多饋入短路比指標。并分別以北京現(xiàn)狀電網(wǎng)、華東遠景年規(guī)劃電網(wǎng)為例,對上述兩個指標的性能進行了分析。(3)對本文中涉及的阻抗模裕度指標、靈敏度指標、電壓關(guān)聯(lián)裕度指標、電壓跌落面積指標和考慮動態(tài)元件模型的多饋入短路比指標在引導(dǎo)無功補償配置方面的應(yīng)用進行了研究。根據(jù)上述指標在算例系統(tǒng)中的節(jié)點薄弱性排序來制定無功補償裝置加裝方案,并與未加裝時及其他加裝方案進行對比,驗證了本文所提指標的有效性和在引導(dǎo)無功補償配置方面的應(yīng)用價值。論文成果可對電力系統(tǒng)的靜態(tài)和暫態(tài)電壓穩(wěn)定性進行更加完備的分析,較為有效地對電網(wǎng)系統(tǒng)中的電壓穩(wěn)定性薄弱區(qū)域、薄弱節(jié)點進行辨識�；诒菊撐闹兴岢龅碾妷悍�(wěn)定性分析指標,可以制定出更加高效的動態(tài)無功補償方案,提高無功補償?shù)呐渲眯Ч?br/>[Abstract]:With the improvement of industrialization and modernization, a series of super-large cities and heavy load centers have gradually formed in Beijing-Tianjin-Tang, Pearl River Delta and Yangtze River Delta. These areas have the characteristics of large proportion of external electricity, insufficient construction of reactive power facilities, limited active power carrying capacity of power grid, and serious problem of voltage stability. The voltage stability index of the power system can be used to evaluate the voltage stability of the power network and identify the weak areas in the power system. Based on the calculated results, reactive power compensation can be added to the grid to improve the voltage stability of key nodes or regions. Therefore, reasonable power system voltage stability index has certain engineering application value. In this paper, the voltage stability index of power system is studied. According to the static index and the transient index, some new indexes with stronger applicability and accuracy are put forward, and the numerical values of the proposed indexes are calculated and compared with each other in an example system, which is improved on the basis of the indexes that have been put forward. Then the reactive power compensation configuration scheme is put forward according to the result of index calculation, and compared with other configuration schemes, and the application effect of various indexes in guiding dynamic reactive power compensation configuration is studied. The main contents are as follows: (1) the principles of impedance mode margin index and sensitivity index in the commonly used static voltage stability index are analyzed. A static voltage stability index-voltage correlation margin index based on network admittance matrix is proposed. Taking Beijing current power grid as an example, the numerical values of three static voltage stability indexes are calculated and compared. Based on the active power margin, the evaluation ability of these three static voltage stability indexes for weak nodes and weak regions is verified. (2) for large proportion of receiving systems, A transient voltage stability index-voltage sag area index based on time domain simulation is introduced. For multi-feed-in system, an index of multi-feed short-circuit ratio considering dynamic elements is analyzed and perfected. Taking Beijing current power grid and East China long-term planning power grid as examples, the performance of the above two indexes is analyzed. (3) the impedance mode margin index, sensitivity index, voltage correlation margin index, which are involved in this paper, are analyzed. The application of voltage sag area index and multi-feed short-circuit ratio index considering dynamic element model in guiding reactive power compensation configuration is studied. According to the ranking of node weakness of the above indexes in the numerical example system, the scheme of adding reactive power compensation device is worked out, and compared with the non-installed and other installation schemes. The validity of the proposed index and its application value in guiding reactive power compensation configuration are verified. The results of this paper can make a more complete analysis of the static and transient voltage stability of the power system, and identify the weak nodes and the weak regions of the voltage stability in the power system more effectively. Based on the voltage stability index proposed in this paper, a more efficient dynamic reactive power compensation scheme can be worked out, and the configuration effect of reactive power compensation can be improved.
【學(xué)位授予單位】：中國電力科學(xué)研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM712

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