本文選題：電力系統(tǒng) + 結(jié)構(gòu)脆弱性　； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：大規(guī)模電力系統(tǒng)在帶來(lái)巨大經(jīng)濟(jì)利益的同時(shí),潛在風(fēng)險(xiǎn)也較之前更有威脅。近年來(lái)國(guó)內(nèi)外電力系統(tǒng)的大停電事故,多由級(jí)聯(lián)故障而非單一故障引起。傳統(tǒng)穩(wěn)定性分析已不能保證電網(wǎng)的安全有效運(yùn)行,電力系統(tǒng)的脆弱性引起了國(guó)內(nèi)外學(xué)者的廣泛關(guān)注,針對(duì)大電網(wǎng)薄弱環(huán)節(jié)的脆弱性評(píng)估近些年來(lái)則成為了一個(gè)研究熱點(diǎn)。 在廣泛收集國(guó)內(nèi)外相關(guān)文獻(xiàn)的基礎(chǔ)上,給出了電力系統(tǒng)脆弱性的一個(gè)描述性定義,對(duì)其進(jìn)行了合理分類,將其分為結(jié)構(gòu)脆弱性、狀態(tài)脆弱性和綜合脆弱性,并深入分析了國(guó)內(nèi)外的研究現(xiàn)狀。介紹了級(jí)聯(lián)故障的表現(xiàn)形式,基于復(fù)雜網(wǎng)絡(luò)理論,采用事故鏈模型對(duì)級(jí)聯(lián)故障進(jìn)行描述。結(jié)果表明,以事故鏈模型分析級(jí)聯(lián)故障,符合大停電發(fā)生的物理特征和實(shí)際過(guò)程。 在結(jié)構(gòu)脆弱性評(píng)估方面,介紹了圖論中圖、樹、最小生成樹等的概念,對(duì)求最小生成樹的克魯斯卡爾算法做出了改進(jìn),并應(yīng)用于電力網(wǎng)絡(luò)的結(jié)構(gòu)分析,引出了“最小潮流樹”的概念,從而為大型復(fù)雜系統(tǒng)網(wǎng)絡(luò)結(jié)構(gòu)的定量分析開辟了一條新的途徑。在此基礎(chǔ)上,從有功功率的區(qū)域平衡和傳輸距離兩方面,對(duì)電力系統(tǒng)整體結(jié)構(gòu)的脆弱性進(jìn)行了綜合評(píng)估。在狀態(tài)脆弱性評(píng)估方面,綜合考慮了母線電壓的穩(wěn)定裕度及變化率、和線路的傳輸功率,采用局部參數(shù)的連續(xù)潮流法求出母線的PV曲線,用來(lái)分析母線的靜態(tài)電壓穩(wěn)定情況及臨界電壓�；跉w一化的思想,分別構(gòu)建了母線電壓狀態(tài)指標(biāo)和線路功率越限指標(biāo),并將二者結(jié)合以綜合反映系統(tǒng)的狀態(tài)脆弱性�；陲L(fēng)險(xiǎn)評(píng)估理論,考慮了級(jí)聯(lián)故障的發(fā)生概率,結(jié)合結(jié)構(gòu)脆弱性和狀態(tài)脆弱性指標(biāo),對(duì)級(jí)聯(lián)故障下的系統(tǒng)脆弱性進(jìn)行綜合評(píng)估,并以此為基礎(chǔ)評(píng)估了各條線路的脆弱性,以確定系統(tǒng)的關(guān)鍵線路。 以IEEE-24RTS系統(tǒng)為例,分別分析了系統(tǒng)在正常運(yùn)行、N-1故障、N-2故障狀況下的情況,并指出了系統(tǒng)中的關(guān)鍵線路,驗(yàn)證了本文所提方法的正確性和有效性。
[Abstract]:At the same time, the potential risks of large power systems are more dangerous than before. In recent years, power outages at home and abroad are mostly caused by cascading faults rather than single faults. Traditional stability analysis can not guarantee the safe and effective operation of power grid. The vulnerability of power system has attracted wide attention from domestic and foreign scholars. In recent years, vulnerability assessment for weak links of large power grid has become a research hotspot. A descriptive definition of power system vulnerability is given on the basis of extensive collection of relevant literature at home and abroad. It is classified into structural vulnerability, state vulnerability and comprehensive vulnerability. The present situation of research at home and abroad is also analyzed. The representation of cascaded faults is introduced. Based on the theory of complex network, the fault chain model is used to describe the cascaded faults. The results show that the analysis of cascaded faults by accident chain model accords with the physical characteristics and actual process of blackout. In the aspect of structural vulnerability assessment, the concepts of graph, tree and minimal spanning tree in graph theory are introduced. The Cruskar algorithm for finding the minimum spanning tree is improved and applied to the structural analysis of power network. The concept of "minimum power flow tree" is introduced, which opens a new way for quantitative analysis of large complex system network structure. On this basis, the fragility of the overall structure of the power system is comprehensively evaluated from the two aspects of active power regional balance and transmission distance. In the aspect of state vulnerability assessment, considering the stability margin and change rate of bus voltage and transmission power of line, the PV curve of bus is obtained by continuous power flow method with local parameters. Used to analyze the static voltage stability and critical voltage of busbar. Based on the idea of normalization, the busbar voltage state index and the line power overrun index are constructed, and the two indexes are combined to reflect the state fragility of the system. Based on the theory of risk assessment, considering the probability of cascaded faults and combining structural vulnerability and state vulnerability index, the vulnerability of cascaded system is comprehensively evaluated, and the vulnerability of each line is evaluated based on the risk assessment theory. To determine the key circuit of the system. Taking IEEE-24RTS system as an example, this paper analyzes the situation of the system under the condition of normal operation of N-1 fault and N-2 fault, points out the key circuit of the system, and verifies the correctness and validity of the method proposed in this paper.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM711

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