特高压直流输电线路暂态能量保护  

Transient Energy Protection for ±800 kV UHVDC Transmission Lines

作　　者：王钢[1] 罗健斌[1] 李海锋[1] 李志铿[1] 

机构地区：[1]华南理工大学电力学院,广东省广州市510640

出　　处：《电力系统自动化》2010年第1期28-31,共4页Automation of Electric Power Systems

基　　金："十一五"国家科技支撑计划重大资助项目(2006BAA02A30);国家自然科学基金重点资助项目(50337010)~~

摘　　要：在分析±800 kV特高压直流输电线路区内外故障、雷击等暂态过程的基础上,提出了一种特高压直流输电线路暂态能量保护新原理。该原理根据各种暂态过程中线路两侧低频能量差值的故障特征,实现了区内故障及其故障极的快速准确识别。基于PSCAD/EMTDC的大量仿真验证,结果表明该保护原理简单、可靠、实用性强,具有绝对的选择性,不受雷击干扰、两极线路电磁耦合和换相失败的影响,高阻接地故障仍具有足够的灵敏性,能满足特高压直流线路对保护性能的要求,可在当前高压直流控制保护系统硬件条件下实现。Based on the theoretical research of the characteristics of different transient process occurred on ±800 kV UHVDC lines, such as internal faults, external faults and lightning, a new protection scheme for UHVDC lines based on transient energy is proposed. The solution can identify an internal fault and its faulted circuit reliably based on the characteristics of low- frequency transient energy differential of the two ends of DC lines. Comprehensive simulation studies using PSCAD/EMTDC show that the proposed scheme is simple, reliable and practical. It not only provides correct responses under various fault conditions including high-resistance faults, but also is of immunity to lightning, electromagnetic coupling between positive and negative circuits, and commutation faults of converters, which satisfies the protection performance requirements for UHVDC lines. Furthermore, the hardware of existing HVDC control and protection systems is enough to support the implementation of the proposed scheme.

关 键 词：特高压直流线路 暂态能量 突变量 线路保护 

分 类 号：TM773[电气工程—电力系统及自动化]