“Sen”变压器(ST)的稳态等效模型研究  

Research on Steady-State Equivalent Model of “Sen” Transformer (ST)

作　　者：陈凯龙 宋洁莹 刘欣[1] 张建坡[1] CHEN Kailong;SONG Jieying;LIU Xin;ZHANG Jianpo(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,Hebei Province,China;State Key Laboratory of Advanced Power Transmission Technology(State Grid Global Energy Interconnection Research Institute),Beijing 102209,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北省保定市071003 [2]先进输电技术国家重点实验室(全球能源互联网研究院),北京市102209

出　　处：《电力建设》2020年第2期76-84,共9页Electric Power Construction

基　　金：国家电网公司科技项目(SGGR0000DLJS1900292);河北省自然科学基金项目(E2019502123)~~

摘　　要："Sen"变压器(Sen transformer,ST)是目前功能最强的电磁式统一潮流控制器。目前对ST的研究主要集中于电路拓扑和可行的控制方案,而对ST的建模研究较少,且尚无适用于理论计算和系统分析的ST等效模型。文章基于多绕组变压器的互感模型建立了ST的6端口数学模型,推导了ST的三序电压方程,得到了ST计及空载特性的三序等效电路。各序短路阻抗均可根据各序变比和绕组漏抗及电阻计算得到。在PSCAD软件中搭建了ST的仿真模型,进行了稳态潮流和短路电流的仿真计算。将等效模型计算结果与仿真进行对比,结果显示:两者吻合良好,线路电流最大相对误差不超过0.15%,从而验证了ST等效模型的有效性。"Sen"Transformer(ST)is the most powerful electromagnetic unified power flow controller.At present,the research on ST mainly focuses on circuit topology and feasible control schemes,and there is little research on ST modeling.There is no equivalent model of ST for theoretical and systematic analysis.Based on the mutual inductance model of multiw inding transformer,the 6-port mathematical model of ST is established.In addition,the three-sequence voltage equation of ST is derived.Then the three sequence equivalent circuits w ith excitation characteristic are obtained.And each sequence short-circuit impedance can be calculated from each transformation ratio and w inding resistance and leakage reactance.The simulation model of ST is built in PSCAD softw are,and the simulations of steady-state current and short-circuit current are carried out.Simulation results and the equivalent model are in good agreement,and the maximum relative error of line current is less than 0.15%,which verifies the effectiveness of the ST equivalent model.

关 键 词：“Sen”变压器(ST) 电压方程 三序等效电路 短路阻抗 电磁式统一潮流控制器 

分 类 号：TM721[电气工程—电力系统及自动化]