基于不对称导纳阵的在线动态外网等值算法  

New dynamic equivalent algorithm based on asymmetrical admittance matrix

作　　者：王刚[1] 张伯明[1] 孙宏斌[1] 吴文传[1] 

机构地区：[1]清华大学电机系电力系统国家重点实验室,北京100084

出　　处：《中国电力》2007年第1期24-27,共4页Electric Power

基　　金：国家重点基础研究发展计划专项资助项目(2004CB217904);国家自然科学基金资助项目(50595414;50323002)

摘　　要：为提高在线外网等值的计算精度,针对EPRIE′动态等值算法的不足,提出了一种新的等值方法。外网系统仅使用自身的信息,将外网等值为少量等值发电机和一个极小的不对称网络。内网得到外网等值参数后,可以自行进行暂稳仿真计算。计算结果表明:这种方法精度优于EPRIE′法,内网功角曲线和CCT与标准曲线差别很小,可以应用于理论分析和工程实践;随着外网等值发电机的增多,内网仿真结果越来越接近于标准结果;存在一个最优外网等值机数量,使得等值机数量较少且仿真结果的误差较小。To improve the precision of online dynamic equivalents, a new dynamic equivalent algorithm based on EPRIE＇ was proposed. The external power grids can calculate its own dynamic equivalent model with its own information. The results are an asymmetrical admittance matrix and a few equivalent generators. The internal grid can calculate its transient simulation by these data. The tests show that the new algorithm is more precise than EPRIE＇, and there are only a small differences between the results of the new method and those of the standard method. With the increase of the equivalent generators, the results are more and more precise. There exists an optimal number for equivalent generators, which can get more precise results with less external equivalent generators.

关 键 词：EPRIE’ 动态等值 暂态稳定 广域网 分解协调 

分 类 号：TM744[电气工程—电力系统及自动化]