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节点导纳矩阵及潮流计算
目录摘要 (2)1任务及题目要求 (2)2原理介绍 (3)2.1节点导纳矩阵 (3)2.2牛顿-拉夫逊法 (4)2.2.1牛顿-拉夫逊法基本原理 (4)2.2.2牛顿--拉夫逊法潮流求解过程介绍 (6)3分析计算 (11)4结果分析 (15)5总结 (16)参考资料 (17)节点导纳矩阵及潮流计算摘要电力网的运行状态可用节点方程或回路方程来描述。
节点导纳矩阵是以系统元件的等值导纳为基础所建立的、描述电力网络各节点电压和注入电流之间关系的线性方程。
潮流计算是电力系统分析中的一种最基本的计算，它的任务是对给定的运行条件确定系统的运行状态，如各母线上的电压（幅值及相角）、网络中的功率分布及功率损耗等。
本文就节点导纳矩阵和潮流进行分析和计算。
1任务及题目要求题目初始条件：如图所示电网。
1∠002阵Y；2+j13）给出潮流方程或功率方程的表达式；4）当用牛顿-拉夫逊法计算潮流时，给出修正方程和迭代收敛条件。
2原理介绍2.1节点导纳矩阵节点导纳矩阵既可根据自导纳和互导纳的定义直接求取，也可根据电路知识中找出改网络的关联矩阵，在节点电压方程的矩阵形式进行求解。
本章节我们主要讨论的是直接求解导纳矩阵。
根据节点电压方程章节我们知道，在利用电子数字计算机计算电力系统运行情况时，多采用IYV 形式的节点方程式。
其中阶数等于电力网络的节点数。
从而可以得到n 个节点时的节点导纳矩阵方程组：nn Y n +V （2-1） 由此可以得到n 个节点导纳矩阵：nn Y ⎫⎪⎪⎪⎪⎭它反映了网络的参数及接线情况，因此导纳矩阵可以看成是对电力网络电气特性的一种数学抽象。
由导纳短阵所了解的节点方程式是电力网络广泛应用的一种数学模型。
通过上面的讨论，可以看出节点导纳矩阵的有以下特点：（1）导纳矩阵的元素很容易根据网络接线图和支路参数直观地求得，形成节点导纳矩阵的程序比较简单。
（3）导纳矩阵是稀疏矩阵。
它的对角线元素一般不为零，但在非对角线元素中则存在不少零元素。
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