本文選題：余弦排序理論　切入點：配電網(wǎng)規(guī)劃　出處：《長沙理工大學》2014年碩士論文　論文類型：學位論文

【摘要】：配電網(wǎng)是電力系統(tǒng)中重要組成部分,位于電力系統(tǒng)末端,是最接近用戶的部分,也是保障供電質量和運行效率的關鍵環(huán)節(jié)。分布式電源的大量接入,會對配電網(wǎng)及其規(guī)劃產生影響。為了滿足供電企業(yè)和電力用戶要求,使其利益最大化,在配電網(wǎng)規(guī)劃方案進行評價時,通常會綜合考慮經濟性、可靠性、安全性等多方面因素。因此,綜合評價配電網(wǎng)各影響因素,用正確合理的評價方法挑選最優(yōu)方案具有十分重要的意義�；诖�,論文主要研究了含分布式電源接入的配電網(wǎng)規(guī)劃方案的評價問題,主要內容如下：(1)論文考慮了智能電網(wǎng)特性,比較其與傳統(tǒng)電網(wǎng)的不同特點。研究分析了國內外配電網(wǎng)規(guī)劃評價的現(xiàn)狀,以及配電網(wǎng)規(guī)劃方案現(xiàn)有綜合評價方法。在表現(xiàn)智能電網(wǎng)的特性時,主要考慮分布式電源的大量接入,故介紹了分布式電源的特點和分類,分析了分布式電源對配電網(wǎng)規(guī)劃的影響。(2)根據(jù)配電網(wǎng)評價指標體系建立的原則,建立了經濟性、可靠性、適應性、安全性4個一級指標,在一級指標下,分別用10個二級指標來刻畫。用DG投資成本和并網(wǎng)概率、抗毀程度、擴展因子來表示智能電網(wǎng)的特性。通過算例,得到各二級指標的結果,綜合分析其結果,可以得到各一級指標下的最好方案。(3)配電網(wǎng)規(guī)劃評價的傳統(tǒng)方法容易出現(xiàn)主觀評價性強、計算復雜等問題。針對這些問題,采用了余弦排序理論的配電網(wǎng)規(guī)劃評價方法進行算例分析。余弦排序理論是一種將各待評價指標與理想指標建立在一個多維空間中,進而計算各個指標線段的余弦夾角值的排序方法。對一個n(待選方案)行、m(二級指標)列矩陣進行標準化處理,得到評價矩陣；在m維坐標系中,建立n條待評價指標線段；應用熵權法確定權重,計算理想方案指標線段與待評價指標線段的余弦夾角值,比較余弦值大小,得到最優(yōu)方案。根據(jù)某系統(tǒng)算例仿真結果表明,應用余弦排序理論對規(guī)劃待評價方案進行評價,可以有效的弱化指標權重主觀性強和解決排序較難的問題,在決策過程中更靈活。本研究為配電網(wǎng)規(guī)劃人員提供了手段,具有一定的工程實踐意義。
[Abstract]:Distribution network is an important part of the power system, located at the end of the power system, is the closest part of the user, and also a key link to ensure the quality of power supply and operational efficiency. In order to meet the requirements of power supply enterprises and users and maximize their benefits, in order to evaluate the distribution network planning scheme, the economy and reliability are usually considered comprehensively. Therefore, it is very important to synthetically evaluate the influence factors of distribution network and select the optimal scheme with the correct and reasonable evaluation method. This paper mainly studies the evaluation of distribution network planning scheme with distributed power access. The main contents are as follows: (1) the smart grid characteristics are considered in this paper. Compared with the traditional power network, this paper analyzes the present situation of distribution network planning and evaluation at home and abroad, and the existing comprehensive evaluation methods of distribution network planning. The characteristics and classification of distributed generation are introduced, and the influence of distributed generation on distribution network planning is analyzed. According to the principle of distribution network evaluation index system, the economy and reliability are established. Four primary indexes of adaptability and security are described by 10 secondary indexes under the first class index. The characteristics of smart grid are represented by DG investment cost, probability of grid connection, degree of survivability and expansion factor. After getting the results of each secondary index and synthetically analyzing the results, we can get the best scheme under each grade index. The traditional method of distribution network planning evaluation is prone to some problems, such as strong subjective evaluation and complicated calculation, etc. In view of these problems, The distribution network planning and evaluation method based on cosine ordering theory is used to analyze an example. CoSine ranking theory is a kind of method which establishes each index to be evaluated and the ideal index in a multi-dimensional space. Then, the sorting method of cosine angle value of each index line segment is calculated. An evaluation matrix is obtained by standardized treatment of a row (selection scheme) row m (secondary index) column matrix, and n line segments to be evaluated are established in m dimensional coordinate system. The weight is determined by entropy weight method, the angle value of cosine between the ideal index line segment and the line segment to be evaluated is calculated, the size of cosine value is compared, and the optimal scheme is obtained. The application of cosine ordering theory to evaluate the plan to be evaluated can effectively weaken the subjectivity of index weight and solve the difficult problem of ranking, and is more flexible in the decision-making process. This study provides a means for distribution network planners. Has certain engineering practice significance.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM715
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本文編號：1626416