基于MATLAB软件的PQ分解法潮流计算

基于MATLAB软件的P-Q分解法潮流计算 摘要 电力系统潮流计算是研究电力系统稳态运行情况的一种重要的分析计算，它根据给定的运行条件及系统接线情况确定整个电力系统各部分的运行状态：各母线的电压，各元件中流过的功率，系统的功率损耗。在电力系统规划的设计和现有电力系统运行方式的研究中，都需要利用潮流计算来定量地分析比较供电方案或运行方式的合理性，可靠性和经济性。所以，电力系统潮流计算是进行电力系统故障计算，继电保护整定，安全分析的必要工具。随着电力系统网络的急剧扩大和不断复杂，运用手算进行潮流计算已经不现实。但是，伴随着计算机技术的飞速发展，基于计算机的潮流计算也就应运而生了。这样，通过潮流计算，实现对系统的分析成为可能。 本文结合潮流计算的三个基本要求，紧跟该领域的发展，介绍了基于MATLAB软件P-Q分解法潮流计算的程序，该程序用于粗略的计算中小型电力网络的潮流，实现对其的分析。本文所设计的程序，在计算中，所用的算法通俗易懂并对以往的主流算法做了一些改进，提高了计算速度。同时，该程序采用了GUI人机对话，将Excel表格、TXT文档与MATLAB程序紧密联系起来，使输入输出界面更加人性化。 关键词：电力系统潮流计算；P-Q分解法；MATLAB软件 Power flow calculation of P-Q mode based on MATLAB software Abstract Power flow calculation is one of the important calculations which are to study the operation of power system steady state analysis. It is based on the given operating conditions and system wiring to identify the various parts of the power system operating state: the buses voltage, the stream components power, system power loss. both power system planning design and operation of existing power system mode of study are need to use the power flow calculation to quantitatively compare the program or run mode power supply reasonable, reliability and economy. Therefore, the power flow calculation is an essential tool for a calculation of power system faults, protection setting, security analysis. with the rapid expansion of power system network and continuing to be more complex, using hand calculation for flow calculation has been unrealistic. But ,with the celerity development in computer technology, computer-based power flow calculation has also emerged. In this way, It is possible to analysis power system through the power flow calculation. Based on the three basic requirements of power flow calculation and followed by the development of the field, This paper introduces the PQ mode power flow calculation procedure based on MATLAB software .It is used for a rough calculation of the small and medium power network to achieve its analysis. The algorithm used in the procedure mentioned in this paper is more easy to understand and made some improvements to enhance the computing speed rather than the past. At the same time, the program uses the GUI man-machine dialogue. So Excel table, TXT documents is closely linked with the MATLAB program to make the and output interfaces more humanity. Keywords:power flow calculation；P-Q decomposition mode；MATLAB software 不要删除行尾的分节符，此行不会被打印 目录 摘要I AbstractII 第1章 绪论1 1.1 课题背景1 1.2 电力系统潮流计算1 1.2.1 电力系统潮流计算简介1 1.2.2 电力系统潮流计算的基本要求2 1.3 潮流计算的意义及其发展3 1.4 本次毕业设计主要工作4 第2章 潮流计算的原理及具体算法过程6 2.1 电力网络的数学模型6 2.1.1 电力网络的基本方程6 2.1.2 导纳矩阵的形成7 2.1.3 电力网络中几种特殊的数学模型8 2.2 电力系统潮流计算11 2.2.1 电力系统潮流计算数学模型11 2.2.2 电力系统节点分类12 2.2.3 潮流计算的约束条件13 2.3 牛顿-拉夫逊法求解潮流计算13 2.3.1 牛顿-拉夫逊法原理13 2.3.2 P-Q分解法潮流计算15 第3章 基于MATLAB软件 P-Q法潮流计算20 3.1 P-Q分解法程序框图20 3.2 计算步骤及实现各部分功能的程序21 3.2.1 原始数据的输入21 3.2.2 导纳矩阵及，形成23 3.2.3 计算不平衡功率ΔPi及修正相角Δθi25 3.2.4 计算不平衡功率ΔQi及修正相电压ΔVi26 3.2.5 程序运行结果的输出27 第