一种工程实用的动态等值方法  

A Practicable Method for Dynamic Equivalence

作　　者：姚海成[1] 周坚[2] 黄志龙[2] 曹路[2] 杨卫东[1] 徐泰山[1] 谢传治[1] 

机构地区：[1]国网电力科学研究院/南京南瑞集团公司,江苏省南京市210003 [2]华东电力调度中心,上海市200002

出　　处：《电力系统自动化》2009年第19期111-115,共5页Automation of Electric Power Systems

摘　　要：研究同时包含特高压交流和特高压直流华东电网的动态特性有必要搭建电磁仿真平台。为提高电磁平台仿真效率,在保持电网原有动态特性的前提下,在机电暂态仿真环境下对原有网络中非关注的和低电压等级网络分别进行了等值,从而达到缩减规模的目的。采用同调等值法进行外网等值,基于受扰轨迹主导群方法识别同调群,并通过弱化励磁系统调压能力和调整原动机调速系统的调频能力,对等值机的参数进行了修正。对低电压等级网络等值时,首次提出了按与直流关联紧密程度不同而采用不同的工程实用等值方法,兼顾了等值效果和仿真效率。To investigate the dynamic characteristics of East China Power Grid,which contains UHVAC,UHVDC and multi-infeed HVDC,it is necessary to build the electromagnetic transient simulation platform.For efficiency factors,on the premise of reserving the dynamic characteristics of the original power system,both the unconcerned network and low voltage level grids are reduced.In order to simplify the unconcerned network,the coherency equivalence approach is adopted.The coherency identification is based on the dominant mode of the trajectories based on EEAC theory. The parameters of the equivalent generator are adjusted by weakening the voltage-regulating capability of the exciter and tuning the frequency-regulating capability of the equivalent governor. Differently effective and practical methods are adopted to reduce the low voltage level network by their relevancy to DC＇s inverter. Simulation results show that the equivalent effect and efficiency are well balanced with the suggested practical dynamic equivalence method.

关 键 词：电磁暂态 动态等值 低电压网络等值 多馈入直流系统 华东电网 

分 类 号：TM743[电气工程—电力系统及自动化]