電力系統(tǒng)關(guān)鍵斷面的快速識(shí)別與輸電極限分析
本文選題:關(guān)鍵斷面 + 模糊聚類(lèi); 參考:《華北電力大學(xué)》2017年碩士論文
【摘要】:當(dāng)前,隨著國(guó)民用電的增加和經(jīng)濟(jì)的發(fā)展,電力系統(tǒng)的規(guī)模日趨龐大,電網(wǎng)結(jié)構(gòu)和電力系統(tǒng)運(yùn)行方式日趨復(fù)雜。相應(yīng)的對(duì)電力系統(tǒng)安全運(yùn)行的可靠性提出了更高的要求。對(duì)系統(tǒng)中的所有線路都進(jìn)行重點(diǎn)監(jiān)控是不現(xiàn)實(shí)的。關(guān)鍵斷面是電力系統(tǒng)中的薄弱環(huán)節(jié),很多嚴(yán)重的停電事故都是由關(guān)鍵斷面上線路的連鎖反應(yīng)故障引起的。因此,對(duì)系統(tǒng)中的關(guān)鍵斷面進(jìn)行研究具有很強(qiáng)的現(xiàn)實(shí)意義。該領(lǐng)域的研究也是當(dāng)下研究的熱點(diǎn)之一。本文主要對(duì)關(guān)鍵斷面的快速識(shí)別及其輸電極限兩方面的內(nèi)容展開(kāi)了研究。在現(xiàn)有的識(shí)別系統(tǒng)關(guān)鍵斷面的算法中,模糊聚類(lèi)法由于無(wú)需事先給定分類(lèi)個(gè)數(shù),可以有效避免人為因素的主觀影響而得到了廣泛的應(yīng)用。論文所提斷面識(shí)別方法主要分為初始斷面的確定、候選關(guān)鍵斷面的確定以及關(guān)鍵斷面的確定三個(gè)步驟。在確定候選關(guān)鍵斷面線路時(shí),論文提出了“中轉(zhuǎn)站”的概念,采用基于汽車(chē)接力模型的算法實(shí)現(xiàn)對(duì)包含某兩條線路的最短回路的快速搜索,避免了復(fù)雜的矩陣運(yùn)算。在確定關(guān)鍵斷面時(shí),論文定義并計(jì)算了考慮輸電裕度和潮流增加的關(guān)鍵度指標(biāo)。采用所提方法能夠有效地避免漏選線路。以IEEE標(biāo)準(zhǔn)節(jié)點(diǎn)系統(tǒng)算例驗(yàn)證了所提算法的有效性。當(dāng)關(guān)鍵斷面中潮流較重的線路發(fā)生故障而被切除時(shí),及時(shí)計(jì)算出斷面的輸電極限值能夠?yàn)檎{(diào)度員在保證系統(tǒng)安全穩(wěn)定的前提下,制定正確的控制措施提供有力的參考,從而充分利用已有的輸電資源,避免過(guò)甩負(fù)荷、過(guò)切機(jī)組等。輸電斷面的有功潮流控制是實(shí)際電網(wǎng)運(yùn)行中的重要預(yù)防控制手段,準(zhǔn)確掌握關(guān)鍵斷面的輸電極限是調(diào)控?cái)嗝娉绷鞯那疤帷U撐氖紫葘?duì)關(guān)鍵斷面N-1約束下的最大傳輸潮流進(jìn)行了計(jì)算,并提出了基于廣義發(fā)電分布因子(GGDF)定向控制提升斷面輸電極限的算法,該算法考慮了平衡機(jī)對(duì)斷面潮流的控制,且無(wú)需保證總發(fā)電量為常數(shù),更加符合實(shí)際工況。輸電斷面暫態(tài)穩(wěn)定傳輸功率極限是衡量系統(tǒng)穩(wěn)定性的重要指標(biāo)。論文對(duì)斷面的暫穩(wěn)極限傳輸功率進(jìn)行了研究,提出了斷面暫穩(wěn)極限傳輸功率計(jì)算算法。該算法以斷面主導(dǎo)的系統(tǒng)暫態(tài)穩(wěn)定裕度趨于臨界值為目標(biāo),經(jīng)過(guò)多次迭代直至由該斷面主導(dǎo)的系統(tǒng)暫態(tài)穩(wěn)定裕度接近臨界值,此時(shí)斷面的功率即為暫穩(wěn)傳輸極限值。在IEEE39節(jié)點(diǎn)系統(tǒng)中證明了該算法的有效性。
[Abstract]:At present, with the increase of national power consumption and the development of economy, the scale of power system is becoming larger and larger, and the structure of power network and the operation mode of power system are becoming more and more complex. Accordingly, the reliability of power system safety operation has been put forward higher requirements. It is unrealistic to focus on monitoring all circuits in the system. The critical section is the weak link in the power system, and many serious power outages are caused by the chain reaction fault of the line on the key section. Therefore, it is of great practical significance to study the key sections of the system. The research in this field is also one of the hotspots of current research. In this paper, the fast identification of key sections and its transmission limit are studied. In the existing algorithms for identifying the key sections of the system fuzzy clustering method has been widely used because it can avoid the subjective influence of human factors effectively without giving the number of classification in advance. The method is divided into three steps: the determination of the initial section, the determination of the candidate key section and the determination of the key section. The concept of "transfer station" is proposed in this paper, and the algorithm based on vehicle relay model is used to quickly search the shortest circuit containing two circuits, thus avoiding the complex matrix operation. In order to determine the critical section, the critical index considering transmission margin and power flow increase is defined and calculated. The proposed method can effectively avoid missing circuit. The effectiveness of the proposed algorithm is verified by an example of IEEE standard node system. When the line with heavy power flow in the critical section is cut off, calculating the transmission limit of the section in time can provide a powerful reference for the dispatcher to formulate the correct control measures on the premise of ensuring the safety and stability of the system. In order to make full use of existing transmission resources, avoid overload rejection, over-cut units and so on. The active power flow control of transmission section is an important preventive control method in actual power network operation, and it is the premise of regulating section power flow to accurately grasp the transmission limit of key section. In this paper, the maximum transmission power flow under N-1 constraint on key sections is first calculated, and an algorithm for directional control of transmission limit of lifting section based on generalized generation distribution factor (GGDF) is proposed. The algorithm takes into account the control of cross-section power flow by balancer. There is no need to ensure that the total power generation is constant, more in line with the actual working conditions. Transmission power limit of transient stability of transmission section is an important index to measure system stability. In this paper, the transmissibility power of the transient stability limit of the section is studied, and the calculation algorithm of the transmissible power of the transient stability of the section is put forward. In this algorithm, the transient stability margin of the cross-section dominated system tends to the critical value, and the transient stability margin of the system dominated by the section is close to the critical value after several iterations. At this time, the power of the section is the transient stability transmission limit value. The effectiveness of the algorithm is proved in the IEEE39 node system.
【學(xué)位授予單位】:華北電力大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TM711
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