电气技术2024，Vol.25Issue(3)：79-84,6.
背靠背直流输电故障闭锁后过电压分析和优化
Analysis and optimization of overvoltage after fault blocking in back-to-back DC transmission
刘乔 1王俊生1
作者信息
- 1. 南京南瑞继保电气有限公司,南京 211102
- 折叠
摘要
Abstract
When a DC bus ground fault occurs near the grounding point in a back-to-back DC transmission system,overvoltage may occur after the system is blocked.This paper analyzes the short-circuit circuit formed between the fault point and the grounding point,which causes the valve short-circuit protection to act before the pole grounding protection.In such a fault situation,the valve short-circuit protection action X block,causing overvoltage in the DC system during the blocking process.But the DC bus ground fault to act Y block,or the valve short-circuit fault to act X block,does not appear the overvoltage phenomenon after blocking.In this paper,the ground current is introduced as an auxiliary criterion,and two optimization methods are proposed.When the same DC bus ground fault occurs near the grounding side,the control system selectively performs different blocking mode.It can effectively avoid the DC system overvoltage after blocking,and is beneficial to the reliable isolation of power system faults and reduce the risk of the system's primary equipment operation.关键词
背靠背/直流输电/接地故障/过电压/闭锁Key words
back-to-back/DC transmission/ground fault/overvoltage/blocking引用本文复制引用
刘乔,王俊生..背靠背直流输电故障闭锁后过电压分析和优化[J].电气技术,2024,25(3):79-84,6.
