本文選題：低壓配網(wǎng) + 三相負(fù)荷不平衡��； 參考：《長沙理工大學(xué)》2014年碩士論文

【摘要】：節(jié)能減排是促進(jìn)經(jīng)濟(jì)發(fā)展的研究熱點(diǎn),降低配網(wǎng)饋線損耗對節(jié)能減排及電力系統(tǒng)經(jīng)濟(jì)運(yùn)行具有深遠(yuǎn)意義。引起低壓配網(wǎng)饋線損耗過高的主要原因之一是三相負(fù)荷不平衡。三相負(fù)荷平衡化降低配電網(wǎng)網(wǎng)損將明顯改變電網(wǎng)運(yùn)行經(jīng)濟(jì)性。三相負(fù)荷不平衡的產(chǎn)生主要是由于單相用戶的用電類型復(fù)雜、用電隨機(jī)性大、單相負(fù)載的大量引入以及在配網(wǎng)建造初期配網(wǎng)工作人員對負(fù)載相別的選擇單憑主觀經(jīng)驗等。目前改善三相負(fù)荷不平衡的常用方法有無功補(bǔ)償設(shè)備的三相平衡化調(diào)整、三相變單相轉(zhuǎn)換裝置和配網(wǎng)用戶相別調(diào)整法。配網(wǎng)用戶相別調(diào)整法是從源頭解決三相負(fù)荷不平衡問題,操作簡單,實(shí)踐上選用最為普遍的方法,但具體操作缺乏依據(jù),憑主觀經(jīng)驗進(jìn)行調(diào)整。為此,考慮單相用戶分散、相負(fù)荷變化隨機(jī)性大、線損受線路布局及距離等因素影響,結(jié)合低壓三相饋線的拓?fù)浣Y(jié)構(gòu)、節(jié)點(diǎn)支路關(guān)聯(lián)矩陣和饋線損耗的計算,提出一種解決三相負(fù)荷不平衡引起線損過高的配網(wǎng)用戶相別調(diào)整方法—三相饋線損耗模型的相別優(yōu)化調(diào)整方法。在已獲取用戶典型日負(fù)荷曲線的基礎(chǔ)上對同一類型用戶群采用自適應(yīng)慣性權(quán)重的粒子群聚類算法進(jìn)行相似程度的初步聚類,將聚為同類后的用戶進(jìn)行相別優(yōu)化調(diào)整。單相負(fù)荷接入的待定相作為優(yōu)化控制變量,采用含三相電流不平衡度的線損計算公式求解各支路線損,結(jié)合拓?fù)浣Y(jié)構(gòu)與節(jié)點(diǎn)支路關(guān)聯(lián)矩陣之間的聯(lián)系推導(dǎo)低壓饋線損耗隨三相饋線電流變化的準(zhǔn)確計算公式,建立了以用戶接入相別為優(yōu)化變量的饋線損耗之和最小的整數(shù)優(yōu)化模型。通過分支定界工具箱求解整數(shù)優(yōu)化模型,獲得負(fù)荷最佳接入相別計算結(jié)果進(jìn)行用戶相別調(diào)整。該方法應(yīng)用于長沙市某鎮(zhèn)某村一臺區(qū)的三相負(fù)荷平衡化改造工程,利用“用戶用電信息采集系統(tǒng)”收集整理該臺區(qū)用戶的典型日負(fù)荷曲線及相關(guān)用電數(shù)據(jù),求解模型得到該臺區(qū)的用戶負(fù)荷最佳接入相別計算結(jié)果進(jìn)行相別調(diào)整。比較分析調(diào)整前后臺區(qū)的三相電流不平衡度和饋線損耗,驗證該方法能夠有效降低三相負(fù)荷不平衡度,減小饋線損耗,解決三相負(fù)荷不平衡問題效果顯著。
[Abstract]:Energy saving and emission reduction is the research focus of promoting economic development. Reducing the feeder loss of distribution network is of far-reaching significance to energy saving and emission reduction and economic operation of power system. One of the main reasons for the high feeder loss of low voltage distribution network is the unbalanced three-phase load. Three-phase load balance reduces the distribution network loss will obviously change the network operation economy. The unbalance of three-phase load is mainly due to the complexity of single-phase users, the large randomness of power consumption, the introduction of single-phase load, and the subjective experience of distribution network workers' choice of load phase in the initial stage of distribution network construction. At present, the commonly used methods to improve the imbalance of three-phase load are the three-phase balance adjustment of reactive power compensation equipment, the three-phase single-phase conversion device and the distribution network user phase adjustment method. Distribution network user phase adjustment method is to solve the problem of three-phase load imbalance from the source, the operation is simple, the most common method is used in practice, but the concrete operation is lack of basis, the adjustment is based on subjective experience. Therefore, considering the dispersion of single-phase users, the randomness of phase load change, and the influence of line loss on line layout and distance, combined with the topology of low-voltage three-phase feeder, the calculation of node branch correlation matrix and feeder loss, A phase optimization adjustment method for three-phase feeder loss model is proposed to solve the problem of high line loss caused by unbalanced three-phase load. On the basis of the typical daily load curve of users, the particle swarm clustering algorithm with adaptive inertial weight is applied to the same type of user group to carry out the similar initial clustering, and the users who are clustered into the same class are adjusted for phase optimization. As the optimal control variable, the undetermined phase connected by single-phase load is used to calculate the line loss of each branch by using the formula of line loss with three-phase current imbalance. Based on the relation between topology and node branch correlation matrix, an exact formula for calculating the variation of low voltage feed loss with three-phase feeder current is derived, and an integer optimization model is established, in which the sum of feed losses is minimized with user access phase as the optimization variable. The integer optimization model is solved by the branch and bound toolbox, and the load optimal access phase difference calculation result is obtained and the user phase is adjusted. The method is applied to a three-phase load balancing reconstruction project of a village and a village in Changsha City. The typical daily load curve and related data of the users in this area are collected and sorted out by "user Power Information Collection system". By solving the model, the optimal access phase difference calculation result of the user load in the station area is obtained and the phase difference adjustment is carried out. By comparing and analyzing the three-phase current imbalance and feeder loss in the front and back areas, it is proved that this method can effectively reduce the three-phase load imbalance, reduce the feeder loss, and solve the three-phase load imbalance problem effectively.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM727

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

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本文編號：1806388