特高压直流中性母线过电压特性及抑制措施

Over-voltage Characteristics and Suppression Measures of UHV DC Neutral Bus

特高压直流输电工程中,直流换流站的绝缘设计是其中一项关键性技术,其目的是保证换流站电气设备的绝缘水平良好,减少引发绝缘故障的概率,降低运行中的维护费用等。通过介绍几种常见的过电压基本原理,展开分析中性过电压特性,探讨实际运行中可采取的有效抑制措施。

In UHV HVDC transmission project,the insulation design of DC converter station is one of the key technologies.Its purpose is to ensure that the electrical insulation level of converter station is good,to reduce the probability and cost loss of insulation failure,reasonable determination can avoid excessive waste of equipment size,reduce failure rate and maintenance cost.This paper first introduces the basic principles of several kinds of overvoltage,then analyzes the characteristics of neutral overvoltage,and discusses the effective suppression measures in practical operation.