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  本文關鍵詞： 分布式電源 三相潮流計算 前推回推法 線損 接入位置 注入容量　出處：《蘭州理工大學》2014年碩士論文　論文類型：學位論文

【摘要】：目前我國正在發(fā)展智能電網(wǎng),智能電網(wǎng)包括發(fā)、輸、變、配、用及調(diào)度等多個環(huán)節(jié)。當今世界能源緊缺,探索新能源發(fā)電技術迫在眉睫,分布式電源的諸多優(yōu)點使其發(fā)電技術越來越引起全世界電力專家的關注。如何靈活實現(xiàn)分布式電源與集中供電網(wǎng)絡相結合成為專家們研究的重點也是發(fā)展智能電網(wǎng)的目標之一,而潮流計算則作為所有研究的基礎顯得尤為重要。 首先,針對配電網(wǎng)的三相不平衡問題比較突出,線路參數(shù)R/X比較大,傳統(tǒng)的潮流計算方法對配電網(wǎng)不再適用的問題,需要對配電網(wǎng)進行三相潮流計算,建立了配電網(wǎng)相關元件的三相模型。綜合各種潮流算法的優(yōu)缺點,選擇前推回推法對配電網(wǎng)進行三相潮流計算�？紤]前推回推法不能很好的處理環(huán)網(wǎng)和PV節(jié)點,將弱環(huán)配電網(wǎng)等效為一個純輻射配電網(wǎng)和純環(huán)狀網(wǎng)絡,利用疊加原理將所得結果疊加,得到配電網(wǎng)的三相潮流計算結果。 由于分布式電源種類繁多,在進行潮流計算時,不能簡單的將其全部作為PQ節(jié)點。本文根據(jù)幾種典型分布式電源與電網(wǎng)互聯(lián)的接口方式及其運行和控制方式,劃分了不同的節(jié)點類型,提出了各自在潮流計算中的處理方法,其本質(zhì)是將各類節(jié)點轉換為傳統(tǒng)方法能夠處理的PQ節(jié)點,進而實現(xiàn)了含多種分布式電源的弱環(huán)配電網(wǎng)的潮流計算。同時,在IEEE33節(jié)點算例中進行編程分析計算,計算數(shù)據(jù)表明本文提出的算法能夠統(tǒng)一處理各種分布式電源,并對含分布式電源的環(huán)網(wǎng)有較好的收斂性和適應性。 最后,研究分布式電源并網(wǎng)對網(wǎng)損的影響,在純鏈式理想配電網(wǎng)模型下引入分布式電源,分析其對配電網(wǎng)線損變化的影響,并且通過仿真分析,論證了分布式電源不同接入位置和相對負荷不同容量兩個方面對線損的影響。得出了分布式電源引入到配電網(wǎng)后對降低線損有積極作用的結論,為工程的實際運用提供了一種簡單易行的方法。
[Abstract]:At present, smart grid is developing in our country. Smart grid includes power generation, transmission, transformation, distribution, use and dispatch, etc. Nowadays, there is a shortage of energy in the world, so it is urgent to explore new energy generation technology. The power generation technology of distributed generation has attracted more and more attention of power experts all over the world. How to realize the combination of distributed power supply and centralized power supply network flexibly has become the focus of experts' research and the development of intelligent electricity. One of the goals of the web. As the basis of all research, power flow calculation is particularly important. First of all, the three-phase imbalance problem of distribution network is more prominent, the line parameter R / X is relatively large, the traditional power flow calculation method is no longer applicable to the distribution network, it is necessary to carry out three-phase power flow calculation for the distribution network. The three-phase model of relevant components in distribution network is established and the advantages and disadvantages of various power flow algorithms are integrated. The three-phase power flow calculation of distribution network is carried out by selecting forward push back method. Considering that the forward push back method can not deal with the loop network and PV node well, the weak ring distribution network is equivalent to a pure radiation distribution network and a pure ring network. The three phase power flow calculation results of distribution network are obtained by superposition principle. Due to the wide variety of distributed power sources, power flow calculation is carried out. It can not simply be regarded as PQ node. According to several typical interface modes of distributed power generation and power grid and their operation and control mode, different node types are divided in this paper. In this paper, the processing methods in power flow calculation are put forward. The essence of these methods is to convert all kinds of nodes into PQ nodes which can be processed by traditional methods. Furthermore, the power flow calculation of weak ring distribution network with multiple distributed power sources is realized. At the same time, the program analysis and calculation are carried out in the IEEE33 node calculation example. The computational data show that the proposed algorithm can deal with all kinds of distributed power supply uniformly and has good convergence and adaptability to the ring network with distributed power supply. Finally, the influence of distributed power generation on network loss is studied. Under the pure chain ideal distribution network model, the influence of distributed generation on the distribution network loss is analyzed, and the simulation analysis is carried out. This paper demonstrates the influence of different access position and different capacity of distributed generation on line loss, and draws the conclusion that the introduction of distributed generation into distribution network has a positive effect on reducing line loss. It provides a simple and easy method for practical application of engineering.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM744

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本文編號：1475810