含分布式电源的配电网潮流计算及网损分析的研究

发布时间：2018-01-30 08:47

本文关键词： 分布式电源三相潮流计算前推回推法线损接入位置注入容量　出处：《兰州理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：目前我国正在发展智能电网,智能电网包括发、输、变、配、用及调度等多个环节。当今世界能源紧缺,探索新能源发电技术迫在眉睫,分布式电源的诸多优点使其发电技术越来越引起全世界电力专家的关注。如何灵活实现分布式电源与集中供电网络相结合成为专家们研究的重点也是发展智能电网的目标之一,而潮流计算则作为所有研究的基础显得尤为重要。首先,针对配电网的三相不平衡问题比较突出,线路参数R/X比较大,传统的潮流计算方法对配电网不再适用的问题,需要对配电网进行三相潮流计算,建立了配电网相关元件的三相模型。综合各种潮流算法的优缺点,选择前推回推法对配电网进行三相潮流计算。考虑前推回推法不能很好的处理环网和PV节点,将弱环配电网等效为一个纯辐射配电网和纯环状网络,利用叠加原理将所得结果叠加,得到配电网的三相潮流计算结果。由于分布式电源种类繁多,在进行潮流计算时,不能简单的将其全部作为PQ节点。本文根据几种典型分布式电源与电网互联的接口方式及其运行和控制方式,划分了不同的节点类型,提出了各自在潮流计算中的处理方法,其本质是将各类节点转换为传统方法能够处理的PQ节点,进而实现了含多种分布式电源的弱环配电网的潮流计算。同时,在IEEE33节点算例中进行编程分析计算,计算数据表明本文提出的算法能够统一处理各种分布式电源,并对含分布式电源的环网有较好的收敛性和适应性。最后,研究分布式电源并网对网损的影响,在纯链式理想配电网模型下引入分布式电源,分析其对配电网线损变化的影响,并且通过仿真分析,论证了分布式电源不同接入位置和相对负荷不同容量两个方面对线损的影响。得出了分布式电源引入到配电网后对降低线损有积极作用的结论,为工程的实际运用提供了一种简单易行的方法。
[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is more prominent, the line parameter R / X is relatively large, the traditional power flow calculation method is no longer applicable to the distribution network, it is necessary to carry out three-phase power flow calculation for the distribution network.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.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM744

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