【摘要】：如今電力系統(tǒng)已經(jīng)發(fā)展成為超大規(guī)模的復(fù)雜互聯(lián)系統(tǒng),這不僅使系統(tǒng)的運行行為更復(fù)雜,而且也使系統(tǒng)發(fā)生連鎖故障的可能性增大,也更容易導(dǎo)致大面積停電事故的發(fā)生。評估電力系統(tǒng)的脆弱程度,為電力系統(tǒng)安全運行制定正確的應(yīng)對措施提供一定的理論依據(jù),是防范和減少電網(wǎng)停電事故的一項重要的基礎(chǔ)性工作。 本文分析了電力系統(tǒng)節(jié)點脆弱性的特點,提出了將電力系統(tǒng)節(jié)點脆弱性分為狀態(tài)脆弱性和結(jié)構(gòu)脆弱性。建立了利用節(jié)點的相對電壓裕度構(gòu)建的節(jié)點狀態(tài)脆弱性指標(biāo),研究了節(jié)點狀態(tài)脆弱性的評估方法,利用改進(jìn)的非線性潮流算法計算電力系統(tǒng)節(jié)點的臨界電壓,進(jìn)而計算節(jié)點狀態(tài)脆弱性指標(biāo)；建立了利用節(jié)點的重要度構(gòu)建的節(jié)點結(jié)構(gòu)脆弱性指標(biāo),研究了節(jié)點結(jié)構(gòu)脆弱性的評估方法,提出了利用節(jié)點收縮算法來獲得各個節(jié)點的重要度,進(jìn)而計算節(jié)點結(jié)構(gòu)脆弱性指標(biāo)；對這兩方面給予適當(dāng)?shù)臋?quán)重,構(gòu)建了節(jié)點的綜合脆弱性指標(biāo)；研究了節(jié)點綜合脆弱性的評估方法,提出了利用變權(quán)層次分析法確定各節(jié)點合理的權(quán)重值,進(jìn)而計算節(jié)點綜合脆弱性指標(biāo)；利用MATLAB軟件編程應(yīng)用于IEEE14節(jié)點系統(tǒng)驗證了所提電力系統(tǒng)脆弱性評估方法的有效性。比較了風(fēng)電場接入前后電力系統(tǒng)節(jié)點綜合脆弱性的變化,分析了風(fēng)電場接入后對電力系統(tǒng)節(jié)點脆弱性的影響,利用MATLAB軟件編程應(yīng)用于接入風(fēng)場的IEEE14節(jié)點系統(tǒng),結(jié)果表明風(fēng)電場的接入對系統(tǒng)大部分節(jié)點的脆弱度有所改進(jìn),但風(fēng)電場并網(wǎng)節(jié)點的脆弱度則有所增大。
[Abstract]:Nowadays, power system has developed into a large scale complex interconnected system, which not only makes the operation behavior of the system more complex, but also increases the possibility of system cascading faults, and also easily leads to the occurrence of large-scale power outages. It is an important basic work to evaluate the vulnerability of power system and to provide some theoretical basis for making correct countermeasures for the safe operation of power system. It is also an important basic work to prevent and reduce power outages. In this paper, the characteristics of power system node vulnerability are analyzed, and it is proposed that the power system node vulnerability can be divided into state vulnerability and structural vulnerability. Based on the relative voltage margin of the node, the state vulnerability index of the node is established, and the evaluation method of the node state vulnerability is studied. The critical voltage of the power system node is calculated by using the improved nonlinear power flow algorithm. Then the node state vulnerability index is calculated, the node structure vulnerability index constructed by using the node importance degree is established, the evaluation method of node structure vulnerability is studied, and the importance degree of each node is obtained by using node contraction algorithm. And then calculate the structural vulnerability index of nodes; give appropriate weight to these two aspects, construct the comprehensive vulnerability index of nodes; study the evaluation method of node comprehensive vulnerability. A variable weight Analytic hierarchy process (VWAHP) is proposed to determine the reasonable weights of each node, and then to calculate the comprehensive vulnerability index of the nodes, and the effectiveness of the proposed method is verified by the application of MATLAB software to the IEEE14 node system. This paper compares the changes of the comprehensive vulnerability of power system nodes before and after the wind farm access, analyzes the influence of the wind farm access on the power system node vulnerability, and applies the MATLAB software to the IEEE14 node system connected to the wind field. The results show that the connection of wind farm improves the vulnerability of most nodes in the system, but the vulnerability of connected nodes increases.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM73

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