最新复杂配电网潮流算法研究

复杂配电网潮流算法

研究

内容摘要

配电网的潮流计算是配电网络分析的一项重要内容，它根据给定网络的结构和运行条件来确定整个网络的电气状态(主要是各节点的电压幅值和相角，网络中的功率分布及功率损耗等)并进行越界检查，它是对配电系统规划设计和运行方式的合理性，可靠性及经济性进行定量分析的重要依据。配电网潮流计算还是配电系统的电压/无功优化调度，操作模拟和接线变化分析等的基础。当前已有的电网分析软件大多是针对输电网开发出来的，利用的是牛顿一拉夫逊法和快速解耦法，而配电网络有许多不同于输电网络的特点，如：线路长且分支线多，线径小，使R》X；网络的PQ节点多，PV节点少；多个平衡点等，现有的电网分析方法直接应用到配电网是不合适的。有关配电网的潮流算法的研究是目前的热门研究课题之一。鉴于配电潮流计算在配电网运行与管理系统中的基础地位和作用以及当前缺乏完善，本课题的研究具有重要的理论意义和实用价值。

本文首先发展了前人的工作，提出了两种配电网络重构方法，即以提高供电电压质量为目标的配电网络重构方法和以负荷均衡化为目标的配电网络重构方法。提出的方法只需利用有限的量测信息，从而使缺少量测信息的配电系统实现配电网络重构成为可能。本文在前人的基础上，首先探讨分析了几种基本的潮流算法，比较现有各种潮流算法的优缺点，提出了一种既能提高运算速度，又能可靠收敛的潮流计算方法，并且用该方法解决了多平衡节点潮流计算的问题。

Ybus算法是一阶收敛方法，算法的稳定性好，可求解多回路电网，但是处理多电源能力差。牛顿一拉夫逊法是二阶方法，是当前广泛采用的计算潮流分布

的方法，但其收敛受初值的影响较大，当电网的末端电压低于一定值时，牛顿一拉夫逊法开始发散。本文提出的方法的大体思路是先利用改进的Yhus法迭代出合适的初值，再利用基于节点注入电流模型的牛顿一拉夫逊法进行精确计算。这种方法不但改进了配电网潮流计算初值选取的问题，又提高了潮流计算的速度，而且可以解决多平衡节点潮流计算的问题，可以说是一举三得。

本文使用MATLAB软件对所提出的方法进行了实例验证，结果表明算法基本可行。

关键词：配电网潮流计算速度性收敛性多平衡节点 MATLAB

Abstract

Distribution network computing flow calculation iS an important element of Distribution network analysis.According to some known operating conditions(node load or voltage)，it determine the operational status of the entire network(such as the

power distribution network and depletion，and the bus bar voltage worth of Kok)，and make cross-border checks.It is important

evidence to plan the rational，reliability and finance of the program design of distribution systems

and moving motion.Distribution power flow is the readjust of voltage magnitude and optmization

of reactive power of distribution systems and operate the basic of simulation and analyzing the changes of net.Nowadays most of the analyzing software of power system is exploited from transportation systems and used Newton—Raphson and FDLE And different distribution systemss

have different factors，SO it is unflxable to be opened up directly.It is one of the hot issues that the method of power flow of distribution systems.According to lack of the basic and action of operation and management of power flow in distribution systems.Effective mehtod of distribution

systems load flow shows the theoretical meaning and real practice.

I discuss several basic method for distribution systems and compare the merits and demerits of each，and then put forward a method which can raise the courting speed and reliable and also can solve the problem for the system with multi—balance node. Ybus method is a kind of once step convergence which has the good stableman and could solve the network with multi-loop。But the bad ability of dealing with multi-power supply.Newton—Raphson is a twice step convergence method which is widely used but its big effect in the initial value.When the voltage of the last node is lower than some certain of netword，

Newton—Raphson begins to open.The main train of the thought of mine first used the suitable initial value of improving Ybus and then accurate counting the Newton—Raphson which based on

the current injection.It not only can improve the problem of selecting initial value of distribution