本文選題：短路電流超標(biāo) + 電網(wǎng)分區(qū)��； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：隨著國(guó)民經(jīng)濟(jì)的發(fā)展,電力系統(tǒng)的容量不斷增大,我國(guó)一次能源基地與能源需求地區(qū)呈遠(yuǎn)距離逆向分布的特點(diǎn),需要遠(yuǎn)距離大容量輸送電能。為保證電能輸送的經(jīng)濟(jì)性和安全可靠性,傳統(tǒng)的解決方法是升高系統(tǒng)的電壓等級(jí)。電力系統(tǒng)在一個(gè)新的更高電壓等級(jí)問(wèn)世早期,網(wǎng)架結(jié)構(gòu)上不可能做到非常完善,為保證較大的傳輸功率,產(chǎn)生了電磁環(huán)網(wǎng),電網(wǎng)合環(huán)運(yùn)行致使短路電流增大。同時(shí),為應(yīng)對(duì)電力市場(chǎng)化的發(fā)展,主網(wǎng)架的輸電能力和可靠性也應(yīng)向更加完善的方向發(fā)展。針對(duì)短路電流超標(biāo)嚴(yán)重的情況,研究了電網(wǎng)分層分區(qū)模型、區(qū)間聯(lián)絡(luò)線選取方法、大電源接入電網(wǎng)接入點(diǎn)選取等問(wèn)題,給出了新的電網(wǎng)分區(qū)方法,大電源接入電網(wǎng)接入點(diǎn)選取方法,為解決短路電流超標(biāo)問(wèn)題提供了新的思路�？紤]到傳統(tǒng)電網(wǎng)分區(qū)方法未充分考慮電網(wǎng)結(jié)構(gòu)的不足,本文從分層分區(qū)的角度出發(fā),以500kV網(wǎng)架為主干網(wǎng)架,提出了基于改進(jìn)汽車接力模型的電網(wǎng)分區(qū)新方法,該方法無(wú)需進(jìn)行大量的數(shù)學(xué)運(yùn)算,通過(guò)編程進(jìn)行路徑的搜索,尋找距離初始站電氣距離符合要求的站點(diǎn),進(jìn)而進(jìn)行分區(qū)劃分。電網(wǎng)分層分區(qū)運(yùn)行后,當(dāng)某一分區(qū)因元件故障產(chǎn)生區(qū)域功率缺額時(shí),分區(qū)間通過(guò)聯(lián)絡(luò)線提供功率補(bǔ)給或負(fù)荷轉(zhuǎn)移是解決功率缺額的重要措施,與此同時(shí),區(qū)間聯(lián)絡(luò)線既保證了分區(qū)間的聯(lián)系,又可有效避免連鎖故障的發(fā)生。因此,區(qū)間聯(lián)絡(luò)線的選取至關(guān)重要。本文針對(duì)區(qū)間聯(lián)絡(luò)線的選取進(jìn)行了研究,提出了一種基于相對(duì)熵組合賦權(quán)法的區(qū)間聯(lián)絡(luò)線選取的評(píng)估體系,綜合考慮了短路電流、潮流轉(zhuǎn)移、整體潮流水平、節(jié)點(diǎn)電壓穩(wěn)定性、短路容量等指標(biāo),保證了評(píng)價(jià)的完整性與合理性�，F(xiàn)有大電源接入電網(wǎng)接入點(diǎn)的確定方法,主要借助于專家經(jīng)驗(yàn),主觀依賴性過(guò)大,本文構(gòu)建了較為完整的適用于評(píng)價(jià)大電源接入點(diǎn)選取合理性的指標(biāo)體系,該指標(biāo)體系考慮了系統(tǒng)潮流分布、短路電流、N-1故障、穩(wěn)定性、網(wǎng)損等多項(xiàng)指標(biāo),使評(píng)估效果更具有合理性。同時(shí),本文確定綜合權(quán)重的方法為組合賦權(quán)法,避免了單一賦權(quán)法確定權(quán)重時(shí)存在較大的主、客觀性,然后利用基于綜合權(quán)重的改進(jìn)灰色關(guān)聯(lián)分析法對(duì)大電源接入點(diǎn)選取方案進(jìn)行綜合評(píng)估,從電網(wǎng)規(guī)劃角度考慮,為大電源接入電網(wǎng)接入點(diǎn)的選擇提供了一個(gè)切實(shí)可行的方法。最后利用PSD電力系統(tǒng)分析軟件對(duì)唐山電網(wǎng)數(shù)據(jù)進(jìn)行實(shí)例仿真分析,仿真結(jié)果同樣也論證了該評(píng)價(jià)指標(biāo)體系的完整性與該評(píng)估方法的合理性。
[Abstract]:With the development of the national economy, the capacity of the power system is increasing. The primary energy base and the energy demand area in our country are distributed in a long distance and reverse, which requires a long distance and large capacity to transmit electric energy.In order to ensure the economy and safety of power transmission, the traditional solution is to increase the voltage level of the system.In the early days of a new higher voltage level, the grid structure could not be very perfect. In order to ensure the large transmission power, the electromagnetic loop network was generated, and the short circuit current increased due to the closed loop operation of the power network.At the same time, in order to cope with the development of electricity market, the transmission capacity and reliability of main grid should be more perfect.In view of the problem that short-circuit current exceeds the standard seriously, the paper studies the model of power grid hierarchical partition, the method of selecting interval tie-line and the selection of access point of large power supply, and gives a new method of power grid partition.The method of selecting access point for large power supply provides a new way to solve the problem of short circuit current exceeding the standard.Considering that the traditional power grid partition method has not fully considered the shortcomings of the power network structure, this paper presents a new method of power grid partition based on the improved automobile relay model from the point of view of hierarchical partition and taking the 500kV grid as the main network frame.This method does not need to do a lot of mathematical operations, through programming to search the path to find the electrical distance from the initial station to meet the requirements of the station, and then partition.After the operation of the power grid in stratified and partitioned areas, it is an important measure to solve the power gap by providing power supply or load transfer through the tie-line in a certain area because of the component fault, and at the same time,Interval tie-line can not only guarantee the connection of sub-interval, but also effectively avoid the occurrence of cascading faults.Therefore, the selection of interval tie-lines is very important.In this paper, the selection of interval tie-lines is studied, and an evaluation system of interval tie-line selection based on relative entropy combination weight method is proposed, which considers short-circuit current, power flow transfer, overall power flow level and node voltage stability.Short circuit capacity and other indicators ensure the integrity and rationality of the evaluation.The existing methods for determining the access point of large power supply to the power network mainly rely on expert experience and have too much subjective dependence. This paper constructs a relatively complete index system suitable for evaluating the rationality of the selection of large power access points.This index system takes into account the system power flow distribution, short circuit current N-1 fault, stability, network loss and so on, which makes the evaluation effect more reasonable.At the same time, the method of determining the comprehensive weight in this paper is the combination weight method, which avoids the larger subjective and objectivity when the single weight method is used to determine the weight.Then, an improved grey relational analysis method based on comprehensive weight is used to evaluate the selection scheme of large power access points. From the point of view of power network planning, it provides a feasible method for the selection of access points for large power sources.Finally, the simulation analysis of Tangshan power network data is carried out by using PSD power system analysis software. The simulation results also demonstrate the integrity of the evaluation index system and the rationality of the evaluation method.
【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
【分類號(hào)】：TM732

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