适用于交直流混联系统的改进型电流突变量选相元件  

Improved current sudden variable mutation phase selector for AC/DC hybrid system

作　　者：马翼飞 樊艳芳[1] 鲁月华 MA Yifei;FAN Yanfang;LU Yuehua(School of Electrical Engineering,Xinjiang University,Urumqi 830047,China;School of Intelligent Manufacturing,Nanyang Vocational College of Science and Technology,Nanyang 474150,China;School of Mechanical and Electrical Engineering,Linyi Technician Institute,Linyi 276005,China)

机构地区：[1]新疆大学电气工程学院,新疆乌鲁木齐830047 [2]南阳科技职业学院智能制造学院,河南南阳474150 [3]临沂市技师学院机电工程学院,山东临沂276005

出　　处：《电力科学与技术学报》2023年第5期65-74,共10页Journal of Electric Power Science And Technology

基　　金：新疆维吾尔自治区高校科研重点项目(XJEDU2021I009)。

摘　　要：受故障期间直流侧系统等效正负序阻抗不相等特性的影响,应用于受端交流线路的传统电流突变量选相元件存在适应性问题。对传统电流突变量选相元件在交直流混联系统中误选相的问题进行深入分析,提出一种改进型电流突变量选相元件。通过电流补偿的方法对传统相电流突变量进行改进,利用改进后的相电流突变量构建选相系数,根据选相系数的幅值关系进行故障选相,从原理上弥补直流侧等效正负序阻抗不相等的影响。仿真结果表明,该选相方法能够在受端交流线路故障期间快速准确地选出故障相,并具有较好的抗过渡电阻性能。Due to the unequal characteristic of equivalent positive and negative sequence impedance of the DC side system during the fault period,the traditional current mutation phase selector applied to the receiver AC line has some adaptability problems.In this paper,the problem of wrong phase selection of traditional current mutation phase selection element in AC/DC hybrid system is deeply analyzed,and an improved current mutation phase selector is proposed.The traditional phase current mutation is improved by current compensation method,and the phase selection coefficient is constructed by the improved phase current mutation,and the fault phase selection is carried out according to the amplitude relation of the phase selection coefficient,so as to compensate the effect of the unequal equivalent positive and negative sequence impedance on the DC side in principle.Simulation results show that the improved phase selector could quickly and accurately select the fault phase during the failure of the receiver AC line,and the phase selector would have good resistance to transition resistance.

关 键 词：交直流混联系统 选相元件 电流突变量 电流分配系数 补偿电流 

分 类 号：TM773[电气工程—电力系统及自动化]