含分布式电源的配电网规划研究

发布时间：2018-01-14 16:18

本文关键词：含分布式电源的配电网规划研究　出处：《山东大学》2009年硕士论文　论文类型：学位论文

【摘要】： 电力系统规划包括电源规划、输电网规划和配电网规划。配电网处于电力系统末端,是联系电源与用户的一个重要环节,电力系统对用户的供电能力必须通过配电网来实现。其合理性是整个电力系统结构及运行特性的集中反映,与电力用户有着直接的关系。随着分布式电源越来越多的接入配电网系统,基于分布式发电技术的配网规划也随之成为研究的热点。根据出发点的不同,有关分布式电源的规划大致可以分为两种情况:分布式电源在电力网络中的布点规划和考虑分布式电源的配电网扩展规划。前者以电源规划为出发点,后者以电网规划为出发点。本文分别对这两种情况进行了研究。对于分布式电源在现有电力网络中的布点规划,本文建立了含分布式电源的配电网规划经济性模型,以折算到每年的分布式电源的投资及运行费用和线路运行费用最小及引入分布式电源后购电费用最小为目标函数,并把节点电压约束、导线电流约束、分布式电源运行约束三个不等式约束条件通过惩罚因子的形式引入,建立了归一化目标函数。基于遗传算法在解决配电网络规划、变电站选址和定容和分布式电源选址和定容等问题中的出色表现,本文采用改进的自适应遗传算法解决DG布点规划问题。考虑分布式电源的配电网扩展规划,应根据系统的负荷增长情况,在系统达到其容量限制时,以经济成本最小为目标,规划出可以满足负荷增长需要的系统最佳增容方案,即由电网升级、增建线路和变电所以及在适当的位置安装DG所组成的最佳方案。本文考虑了配电网扩展规划条件下新增负荷节点的情况,根据新增负荷总量确定待建分布式电源的总容量。在分布式电源个数、位置和单个电源容量均不确定的情况下,以折算到每年的分布式电源的投资及运行费用和线路建设运行费用最小及引入分布式电源后购电费用最小为目标函数,首先用改进的自适应遗传算法进行分布式电源的规划,对于遗传算法中每代产生的分布式电源容量和位置的个体,采用遗传算法进行网络的扩展规划,把分布式电源的影响加入其中,并对由于遗传算法中的交叉、变异操作产生的不可行解进行修复。通过对分布式电源和网络的综合规划结果进行经济性评估以衡量个体方案的优劣。通过实际算例的分析,本文算法在收敛性能和搜索能力方面比其他遗传算法有一定的提高,并得到了分布式电源较为合理位置和容量方案。算例结果表明,分布式电源的引入有利于配电网优化运行,也从一个侧面印证了分布式发电技术进入电力系统后会带来较有利的影响,同时也印证了分布式发电技术有着广阔的应用前景。
[Abstract]:Power system planning includes power supply planning , power transmission planning and distribution network planning . The distribution network is at the end of the power system . It is an important link between the power supply and the user . The power system has a direct relation to the power supply capability of the user . The rationality of the power system is directly related to the power users . As the distributed power supply becomes more and more connected with the distribution network system , the distribution network planning based on the distributed power generation technology becomes the hot spot of the research . According to the difference of the starting point , the planning of the distributed power supply can be divided into two situations : the layout of the distributed power supply in the power network and the distribution network expansion plan considering the distributed power supply . The former takes the power supply planning as the starting point and the latter takes the grid planning as the starting point . For the layout planning of distributed power supply in the existing power network , this paper establishes an economical model of distribution network planning with distributed power supply to calculate the investment and operation cost of distributed power supply and the minimum cost of operation cost and line operation cost of distributed power supply . The objective function is established by penalty factor . The objective function is established by penalty factor . Based on genetic algorithm , the problem of DG layout planning is solved by improved adaptive genetic algorithm . Considering the distribution network expansion plan of distributed power supply , according to the load increase of the system , when the system reaches its capacity limit , the optimal capacity increase scheme of the system which can meet the demand of load growth is planned based on the minimum economic cost , that is , the best scheme consisting of grid upgrade , build - up circuit and substation and DG set in place . In this paper , the new load node is added under the condition of distribution network expansion planning , and the total capacity of the distributed power supply is determined according to the total new load . The results show that the introduction of distributed power supply is beneficial to the optimal operation of distribution network , and it is also proved that the distributed power generation technology will bring more favorable influence after entering the power system , and the distributed power generation technology has wide application prospect .

【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2009
【分类号】：TM715

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