【作者】 段敦峰；

【导师】 刘启胜；

【作者基本信息】 武汉大学 ， 电力系统及其自动化， 2004， 硕士

【摘要】 对互联系统进行各种不同运行状态下的众多分析计算往往会受到计算机容量的限制或耗费显著的计算机求解时间，因此常常求助于等值方法来缩小系统规模。各种等值方法在电力系统离线、在线分析上有着广泛的应用。本文对静态等值研究中所关心的问题做了比较全面的论述。在静态等值过程中基本节点和基本支路的选择是进行等值计算的第一步，本文采用灵敏度分析方法对这个问题做深入的讨论；静态等值的特点决定了在等值过程中出现非线性误差的情况不可避免，本文对等值计算时产生非线性误差的机理作深入的分析，从而作为对常规WARD等值进行改进的依据。在实际应用中，扩展WARD等值在很多情况下通常能够较好的满足分析计算的精度要求，本文详细叙述了该方法的推导、改进过程，同时根据笔者实际所参与的科研项目的需要，对该方法进行了编程实现，并采用IEEE-57系统进行仿真计算，根据仿真结果进一步讨论WARD等值中所要顾及的一系列问题，所编程序能够应用于笔者所参与的科研项目。更多还原

【Abstract】 It is always restricted by the capability of computers and consumes much calculation time in various analyses of interconnected network which operates in different states. And it often turns to static equivalent methods to reduce the scale of interconnected system to solve this problem. The static equivalent methods are widely used in off-line or on-line analyses of power system. The basic problems of static equivalence are generally discussed in this paper. The selection of basic nodes and basic buses is the first step in reducing a interconnected network by using equivalent methods. This problem is deeply discussed based on a sensitivity analysis method in this paper. The non-linear errors are inevitable which are resulted by the characteristic of static equivalence. The mechanics of the production of non-linear errors is deeply discussed based on the analysis of normal Ward equivalence. And this becomes the theoretical base to improve the normal Ward equivalence. In practical application, the extended Ward equivalence can obtain satisfying precision in many cases. The particular deducing and improving course is described in this paper. And considering the actual requirement, it is programmed to solve the practical reducing problems and the emulating calculation is carried out with IEEE-57 system. The results of emulating calculation are used to proceed more analyses of the problems of Ward equivalence.更多还原