交直流混合电网故障耦合特性分析与继电保护研究  

Fault coupling characteristic analysis and relay protection research on an AC/DC hybrid power grid

作　　者：侯俊杰 宋国兵[1] 徐瑞东 郭冰 尹利帅 吕江涛 HOU Junjie;SONG Guobing;XU Ruidong;GUO Bing;YIN Lishuai;Lü Jiangtao(School of Electrical Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学电气工程学院,陕西西安710049

出　　处：《电力系统保护与控制》2021年第14期176-187,共12页Power System Protection and Control

基　　金：国家自然科学基金联合基金重点支持项目(U1766209);国家电网公司总部科技项目(52094020006U)。

摘　　要：随着交直流混合程度加深,电网运行难度明显增加,保障交直流混合电网安全运行已成为我国电网重大而紧迫的需求。换流站是交直流混合电网的枢纽,区别于传统同步机电源,故障耦合特性呈现复杂性。从换流站对扰动的响应与传递特性出发,阐述了其耦合特性及产生机理,为交直流混合电网的故障分析与保护研究提供了理论基础。在此基础上评估了交直流线路保护适应性,并研究了不同故障时段的继电保护新原理。最后提出了控制与保护协同作用的建议与设想,探讨了进一步的研究方向。As the amount of AC/DC hybridization increases in power systems,the difficulty of grid operation has increased significantly.Therefore,ensuring the safe operation of AC/DC hybrid grid has become a major and urgent issue for China.The converter station is the hub of an AC/DC hybrid grid.Different from the traditional synchronous machine power supply,its fault coupling characteristics are complicated.In this paper,starting from the response and transfer characteristics of the converter station to the disturbance,this paper explains the coupling characteristics and generation mechanism first.This provides a theoretical basis for the fault analysis and protection research of the AC/DC hybrid grid.Furthermore,it evaluates the adaptability of AC and DC line protection and studies new principles of relay protection in different fault periods.Finally,it puts forward an idea for control and protection coordination,and discusses further research directions.

关 键 词：交直流混合电网 故障耦合特性 继电保护 控保协同 

分 类 号：TM721.3[电气工程—电力系统及自动化] TM77