提高特高压直流输电系统可靠性的措施

随着我国经济的持续、高速发展,电力需求越来越大,长距离大容量直流输电项目越来越多,超高压、特高压直流输电系统的可靠性问题愈显重要。本文分析总结了已建±500kV换流站运行情况,分析各种典型故障原因及改善薄弱环节的措施。在对特高压直流输电工程特点和可靠性系统分析的基础上,提出了提高特高压直流输电系统可靠性的系列手段和方法,从而为新建特高压直流输电系统设计、运行和管理提供借鉴。

The Measures Enhancing System Dependability of Extra High Voltage Direct Current Transmission System

With the rapid and continuous development of China economy,its power demand grows greatly,more and more bulk capacity extra and ultra high voltage direct current transmission projects are under construction or in planning stage.This paper reviews the operations of some typical 500kV converter stations,gives an overall analy- sis of fault cases.Based on the research of the features of ultra high voltage direct current system,the reliability of a practical 800kV project is evaluated in order to find the key factors that affect system reliability significantly, and then some measures and methods are presented to enhance the reliability of UHVDC system.