基于潮流及短路计算的电力系统Ward等值实现方法  

A method to implement Ward equivalent based on power flow calculation and short circuit calculation

作　　者：许海 杨尚瑾 金雪芬 汪扬 XU Hai;YANG Shangjin;JIN Xuefen;WANG Yang(NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;China EPRI Science&Technology Co.,Ltd,Beijing 102200,China)

机构地区：[1]南瑞集团(国网电力科学研究院)有限公司,江苏南京211106 [2]中电普瑞科技有限公司,北京102200

出　　处：《电力系统保护与控制》2018年第24期104-110,共7页Power System Protection and Control

基　　金：国家电网公司科技项目"超;特高压串联补偿装置状态监测技术的研究及应用"(52466F150007)~~

摘　　要：对电力系统进行电磁暂态计算,需搭建原系统的等值模型。在电力市场环境下,由于商业机密,相关从业人员可能不具有电力系统外部网络信息,或不具备对大型电力系统进行等值的软件模块,这给工程计算带来了困难。针对这一问题,提出一种基于潮流和短路计算的电力系统Ward等值实现方法。首先将内部网络流向边界节点的电流作为边界节点的等效注入电流,进而对边界节点进行短路电流计算,获得相应的短路电流和节点电压,最后通过节点电压方程求解等值系统参数。理论和实际系统算例分析表明,该方法具有极高的准确性。To perform electromagnetic transient calculation on power systems,the equivalent simplification of original system should be carried out.In the electricity market environment,due to trade secrets,the relevant practitioners may not have external network information,or do not have software modules for equivalent simplification of large-scale power system,which brings difficulties to engineering calculation.A method to implement Ward equivalent based on power flow calculation and short circuit calculation is proposed.First,the currents from internal network to boundary nodes are treated as equivalent injection currents of boundary nodes.Then the node voltages and short-circuit currents are obtained by short-circuit current calculation of the boundary nodes of original system.Finally,the equivalent system parameters are calculated by node voltage equation.Theoretical analyses and results of an actual system simulation show that this method has high accuracy.

关 键 词：系统等值 潮流计算 短路计算 节点电压 节点导纳矩阵 

分 类 号：TM744[电气工程—电力系统及自动化] TM713