Study on Fault Isolation Strategy of Overhead Transmission Line Based on DC Circuit Breaker in Flexible DC Grid

ZHANG Qun; ZHAO Qian; HAO Junfang; YAN Bing; WANG Yao; KONG Lingkai; CHEN Peng

doi:10.13296/j.1001-1609.hva.2020.03.003

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Study on Fault Isolation Strategy of Overhead Transmission Line Based on DC Circuit Breaker in Flexible DC Grid

更新时间：2025-04-26

- Study on Fault Isolation Strategy of Overhead Transmission Line Based on DC Circuit Breaker in Flexible DC Grid
- High VoltageApparatus Vol. 56, Issue 3, Pages: 17-22(2020)
- 作者机构：
  
  许继电气直流输电分公司
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2020.03.003
  CLC： TM721.1
- Published：2020
- 稿件说明：
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[1]张群,赵倩,郝俊芳,严兵,王瑶,孔令凯,陈朋.基于直流断路器的柔性直流电网架空线路故障隔离策略研究[J].高压电器,2020,56(03):17-22.

ZHANG Qun, ZHAO Qian, HAO Junfang, et al. Study on Fault Isolation Strategy of Overhead Transmission Line Based on DC Circuit Breaker in Flexible DC Grid[J]. High voltageapparatus, 2020, 56(3): 17-22.
[1]张群,赵倩,郝俊芳,严兵,王瑶,孔令凯,陈朋.基于直流断路器的柔性直流电网架空线路故障隔离策略研究[J].高压电器,2020,56(03):17-22. DOI： 10.13296/j.1001-1609.hva.2020.03.003.

ZHANG Qun, ZHAO Qian, HAO Junfang, et al. Study on Fault Isolation Strategy of Overhead Transmission Line Based on DC Circuit Breaker in Flexible DC Grid[J]. High voltageapparatus, 2020, 56(3): 17-22. DOI： 10.13296/j.1001-1609.hva.2020.03.003.

摘要

柔性直流输电技术未来将向大规模柔性直流电网发展

从经济性和通用性来看使用架空线路的柔性直流电网最具发展前景

然而架空线路故障率较高

如何实现直流线路故障的快速隔离和系统恢复成为制约柔性直流电网发展的关键因素。针对该问题

文中基于张北柔性直流电网示范工程

以半桥结构的模块化多电平换流器进行了研究

提出了适用于工程应用的直流架空线路故障隔离措施和线路故障恢复策略

并基于RT-LAB实时仿真平台搭建了张北工程四端直流电网系统

对相应的隔离方法及故障恢复策略进行了仿真验证

结果表明

可降低直流线路故障对交流系统的影响

降低直流限流切除对系统稳定性和安全性的影响

为柔直电网工程的实际应用提供了依据。

Abstract

Flexible HVDC technology will develop into flexible HVDC power grid with different topologies in the future.Considering the economy and commonality

the flexible HVDC grid using overhead line will be the development trend of the future.But the fault rate of overhead line is high

how to quickly isolate the DC line fault and restore the system to normal operation without affecting the power transmission is a key factor restricting the development of flexible HVDC power grid.Against this problem

based on Zhangbei flexible DC power grid demonstration project

the half-bridge modular multilevel converter has been studied in this paper

and DC overhead line fault isolation strategy and overhead line fault recovery strategy for engineering application have been proposed.Based on RTLAB real-time simulation platform

a four-terminal DC grid system of Zhangbei project is set up.The corresponding fault isolation strategy and fault recovery strategy are simulated.The results show that the impact of DC line faults on the AC system can be reduced

and the effect of the DC current limit removal on system stability and safety can be reduced

providing a reference for flexible HVDC power grid project application.

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