应用余弦排序理论的含分布式电源配电网规划方案评价

发布时间：2018-03-17 20:49

  本文选题：余弦排序理论　切入点：配电网规划　出处：《长沙理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：配电网是电力系统中重要组成部分,位于电力系统末端,是最接近用户的部分,也是保障供电质量和运行效率的关键环节。分布式电源的大量接入,会对配电网及其规划产生影响。为了满足供电企业和电力用户要求,使其利益最大化,在配电网规划方案进行评价时,通常会综合考虑经济性、可靠性、安全性等多方面因素。因此,综合评价配电网各影响因素,用正确合理的评价方法挑选最优方案具有十分重要的意义。基于此,论文主要研究了含分布式电源接入的配电网规划方案的评价问题,主要内容如下：(1)论文考虑了智能电网特性,比较其与传统电网的不同特点。研究分析了国内外配电网规划评价的现状,以及配电网规划方案现有综合评价方法。在表现智能电网的特性时,主要考虑分布式电源的大量接入,故介绍了分布式电源的特点和分类,分析了分布式电源对配电网规划的影响。(2)根据配电网评价指标体系建立的原则,建立了经济性、可靠性、适应性、安全性4个一级指标,在一级指标下,分别用10个二级指标来刻画。用DG投资成本和并网概率、抗毁程度、扩展因子来表示智能电网的特性。通过算例,得到各二级指标的结果,综合分析其结果,可以得到各一级指标下的最好方案。(3)配电网规划评价的传统方法容易出现主观评价性强、计算复杂等问题。针对这些问题,采用了余弦排序理论的配电网规划评价方法进行算例分析。余弦排序理论是一种将各待评价指标与理想指标建立在一个多维空间中,进而计算各个指标线段的余弦夹角值的排序方法。对一个n(待选方案)行、m(二级指标)列矩阵进行标准化处理,得到评价矩阵；在m维坐标系中,建立n条待评价指标线段；应用熵权法确定权重,计算理想方案指标线段与待评价指标线段的余弦夹角值,比较余弦值大小,得到最优方案。根据某系统算例仿真结果表明,应用余弦排序理论对规划待评价方案进行评价,可以有效的弱化指标权重主观性强和解决排序较难的问题,在决策过程中更灵活。本研究为配电网规划人员提供了手段,具有一定的工程实践意义。
[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.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM715
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本文编号：1626416