本文選題：合環(huán)電流 + 電壓差　； 參考：《華北電力大學(xué)》2014年碩士論文

【摘要】：隨著首都電力系統(tǒng)電網(wǎng)結(jié)構(gòu)的不斷完善,電力運(yùn)行方式的日趨靈活,電力用戶(hù)服務(wù)水平穩(wěn)步提升。為了進(jìn)一步提高首都配電網(wǎng)的可靠性,降低網(wǎng)損,提高網(wǎng)絡(luò)的負(fù)載能力和利用效率,使互供能力更強(qiáng),建立環(huán)網(wǎng)供電為主的網(wǎng)絡(luò)結(jié)構(gòu)是必然趨勢(shì),使配網(wǎng)網(wǎng)絡(luò)能滿(mǎn)足各種運(yùn)行方式的需要。 配電網(wǎng)進(jìn)行合環(huán)操作時(shí)兩側(cè)電源一般處于分裂運(yùn)行狀態(tài),常常因合環(huán)點(diǎn)開(kāi)關(guān)兩側(cè)母線或線路電壓差的存在,使合環(huán)操作中產(chǎn)生的環(huán)流過(guò)大引起過(guò)流保護(hù)誤動(dòng)。為了保證重要用戶(hù)的不間斷供電,了解配網(wǎng)潮流的變化情況,避免不必要的過(guò)負(fù)荷或者意外事故,需要對(duì)合環(huán)電流進(jìn)行詳細(xì)的分析和計(jì)算,有助于運(yùn)行人員對(duì)地區(qū)電力網(wǎng)絡(luò)的運(yùn)行方式進(jìn)行適當(dāng)?shù)恼{(diào)整,從而保證用戶(hù)利益,減少停電損失。 本文結(jié)合配電網(wǎng)的基本結(jié)構(gòu)和配電網(wǎng)的運(yùn)行方式的特點(diǎn),一一列舉了合環(huán)操作的種類(lèi),合環(huán)操作的優(yōu)勢(shì)和潛在的風(fēng)險(xiǎn)問(wèn)題。以電網(wǎng)潮流計(jì)算方法、合環(huán)穩(wěn)態(tài)電流計(jì)算方法、暫態(tài)電流計(jì)算方法、短路電流計(jì)算方法為理論依據(jù),選取北京通州典型配網(wǎng)案例進(jìn)行分析。 伴隨北京通州區(qū)作為“首都副中心”的高速建設(shè),提高電網(wǎng)供電能力和電力保障水平都尤為重要,結(jié)合工作實(shí)際,從地區(qū)現(xiàn)狀和電力用戶(hù)需求著手,依托通州電網(wǎng)“網(wǎng)格化”配網(wǎng)規(guī)劃,通過(guò)10kV配網(wǎng)合環(huán),網(wǎng)架結(jié)構(gòu)趨于合理,供電半徑大大縮短,將有效降低線路損耗,對(duì)地區(qū)節(jié)能減排將產(chǎn)生較大的正面推進(jìn)作用,進(jìn)而提高供電可靠率,改善通州地區(qū)人居環(huán)境。 通州龍湖開(kāi)閉站由于兩個(gè)上級(jí)電源接地方式不同,10kV側(cè)合環(huán)操作將造成較大合環(huán)電流,因此,選取龍湖開(kāi)閉站作為典型案例。通過(guò)對(duì)合環(huán)穩(wěn)態(tài)電流、合環(huán)暫態(tài)電流的計(jì)算分析以及合環(huán)運(yùn)行下該開(kāi)閉站母線、饋線發(fā)生接地故障時(shí)的電網(wǎng)潮流以及負(fù)荷分配的逐一梳理分析,從而判斷合環(huán)電流對(duì)調(diào)度運(yùn)行、繼電保護(hù)的影響并采取相應(yīng)措施。
[Abstract]:With the continuous improvement of the power network structure of the capital electric power system and the increasingly flexible operation mode of the power system, the service level of the electric power users is steadily improved. In order to further improve the reliability of the capital distribution network, reduce the network loss, improve the load capacity and utilization efficiency of the network, and make the mutual power supply ability stronger, it is an inevitable trend to establish a network structure dominated by power supply in the ring network. The distribution network can meet the needs of various operation modes. The power supply on both sides of the distribution network is generally in a split state when it is operated by a closed loop, and the overcurrent protection is often misoperated due to the existence of the busbar or line voltage difference between the two sides of the closing point switch, and the circulation generated in the closed loop operation is too large. In order to ensure uninterrupted power supply for important users, to understand the change of distribution network power flow and to avoid unnecessary overload or accidents, it is necessary to analyze and calculate the involutive loop current in detail. It is helpful for operators to adjust the operation mode of local electric power network properly, so as to ensure the interests of users and reduce the loss of power cut. Combined with the basic structure of distribution network and the characteristics of distribution network operation mode, this paper enumerates the types of closed loop operation, the advantages and potential risks of closed ring operation. Based on the theoretical basis of power flow calculation method, closed loop steady state current calculation method, transient current calculation method and short-circuit current calculation method, a typical case of Tongzhou distribution network in Beijing is selected for analysis. With the high speed construction of Tongzhou District as the "capital sub-center", it is particularly important to improve the power supply capacity and the power security level of the power network. In combination with the actual work, starting from the current situation of the region and the demand of electric power users, Relying on the "grid" distribution planning of Tongzhou Power Grid, the grid structure tends to be reasonable and the power supply radius is greatly shortened through the 10 kV distribution ring, which will effectively reduce the line loss and will have a greater positive role in promoting energy saving and emission reduction in the region. And then improve the reliability of power supply, improve the living environment in Tongzhou area. In Tongzhou Longhu open and close station, because of the different earthing modes of two higher power sources, 10kV side closing current will be caused. Therefore, the Longhu open and close station is selected as a typical case. Through the calculation and analysis of the involutive loop steady current, the transient current of the closed loop and the busbar of the open and close station under the closed loop operation, the grid power flow and load distribution in the case of grounding fault of the feeder line are analyzed one by one, so as to judge the operation of the closed loop current to the dispatching. The influence of relay protection and corresponding measures are taken.
【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】：2014
【分類(lèi)號(hào)】：TM732

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