基于边界支路的电网等值方法  

Equivalence Method of Power Grid Based on Boundary Branch

作　　者：邢华栋 慕腾 刘会强 武海燕 原帅[1,2] 张爱军 XING Huadong;MU Teng;LIU Huiqiang;WU Haiyan;YUAN Shuai;ZHANG Aijun(Inner Mongolia Electric Power Research Institute,Hohhot 0l0020,China;Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System,Hohhot 010020,China)

机构地区：[1]内蒙古电力科学研究院,呼和浩特010020 [2]内蒙古自治区电力系统智能化电网仿真企业重点实验室,呼和浩特010020

出　　处：《南方电网技术》2021年第4期73-80,共8页Southern Power System Technology

基　　金：内蒙古电力(集团)有限责任公司科技项目(2019-03,2020-42)。

摘　　要：使用PSCAD软件对大规模电力系统的局部区域进行电磁暂态分析时,需要将整个系统分为内部系统和外部系统2部分,并对外部系统进行等值简化。由于Ward等值方法获得的外部系统等值参数包含了内部系统π形联络线的对地导纳参数,导致外部等值系统与内部系统拼接后不能复现原系统潮流。因此提出了一种基于边界支路的外网等值方法。在内部系统与外部系统之间串入阻抗极小的边界支路,然后再使用Ward等值方法,可保证获得的外部系统等值参数不包含内部系统的任何参数。同时,该方法克服了PSD-SCCP等值模块只能对整个电网进行等值计算的局限性,给出了利用PSD-SCCP实现基于边界支路的外网等值方法的具体步骤。理论和实际系统算例分析表明,该方法具有极高的准确性和实用性。In order to perform electromagnetic transient analysis on a part of a large-scale power system by PSCAD,the whole system has to be divided into two parts,namely the internal system and the external system,and then the equivalent simplification of the external system is carried out.Because the equivalent parameters of the external system obtained by Ward equivalent method contain the ground admittance parameters of the transmission line simulated byπequivalent circuit of the internal system,the original system power flow cannot be reproduced after the external equivalent system is spliced with the internal system.For this reason an equivalent method for regional power network based on boundary branch is proposed,by means of the boundary branch with minimum impedance between internal system and external system,the equivalent parameters of the external system obtained by Ward equivalent method will not contain any parameters of the internal system.The proposed method also overcomes the limitations of PSD-SCCP which can only calculate the equivalence of the whole system.And then the specific steps of realizing the equivalence method of external network based on boundary branch by PSD-SCCP are given.Theoretical analysis and results of an actual system simulation show that this method has a high veracity and practicability.

关 键 词：边界支路 PSD-SCCP 电网等值 PSCAD 电磁暂态分析 

分 类 号：TM743[电气工程—电力系统及自动化]