多端直流系统直流故障保护研究综述

A Survey on Relay Protection for Multi-terminal DC System

摘要:

多端直流输电系统具有灵活的潮流控制能力，但其直流故障保护问题也更为复杂。文中综述了国内外多端直流系统的故障保护研究现状，分析了其故障特征和保护需求，讨论了现有的保护原理和方法，包括电压/电流保护、纵联保护和行波暂态量保护，并针对多端直流系统的故障隔离问题，从选择性和恢复速度的角度对现有的策略进行了分析。最后，提出了进一步研究的方向和建议。

Abstract:

Multi-terminal DC transmission systems have flexible power flow control capabilities，but their DC fault protection problems are also more complex. This paper reviews the current research status of fault protection for multi-terminal DC systems at home and abroad，analyzes their fault characteristics and protection requirements，and discusses the existing protection principles and methods，including voltage/current protection，pilot protection and traveling wave or transient based protection. Moreover，the different fault isolation strategies are compared considering the power system requirements，such as rapidity and reliability. Finally，the further research directions and suggestions are proposed.