基于多维电气量配合的柔性直流电网线路纵联保护方法

李小鹏; 陈可傲; 徐莹; 罗易萍

doi:10.16527/j.issn.1003-6954.20250501

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基于多维电气量配合的柔性直流电网线路纵联保护方法

更新时间：2026-02-13

- 基于多维电气量配合的柔性直流电网线路纵联保护方法
- Vol. 48, Issue 5, Pages: 1-7+62(2025)
- 作者机构：
  
  1. 国网四川省电力公司电力科学研究院
  2. 国网经济技术研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.16527/j.issn.1003-6954.20250501
  CLC： TM773;TM721.1
- Published：2025
- 稿件说明：
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李小鹏, 陈可傲, 徐莹, et al. 基于多维电气量配合的柔性直流电网线路纵联保护方法[J]. 2025, 48(5): 1-7+62.
DOI：

李小鹏, 陈可傲, 徐莹, et al. 基于多维电气量配合的柔性直流电网线路纵联保护方法[J]. 2025, 48(5): 1-7+62. DOI： 10.16527/j.issn.1003-6954.20250501.

摘要

柔性直流电网已普遍采用模块化多电平换流器(modular multilevel converter

MMC)技术。直流线路发生故障后，故障电流快速上升，而MMC耐流能力较弱，导致子模块快速闭锁，进而对故障暂态特征带来强非线性，严重影响直流线路保护的性能，增加电网停运风险。针对上述问题，提出了一种基于暂态电压与全电流配合的纵联保护方法。该方法无需大量数据交换和精确时钟同步，仅需向对侧发送故障方向信息即可识别故障区间。基于PSCAD/EMTDC仿真平台搭建的柔性直流电网模型测试结果表明，所提保护方法能有效克服换流器闭锁的影响，具有较强的耐过渡电阻能力，在保证速动性和选择性的同时具有较高的可靠性。

Abstract

Modular multilevel converter (MMC) technology has been widely adopted in flexible HVDC grids. When a DC line fault occurs

the fault current rises rapidly. However

due to the weak current-carrying capability of MMC

the converter will be quickly blocked

which further introduces strong nonlinearity to the fault transient characteristics and seriously affects the performance of DC line protection

increasing the risk of grid outage. Regarding the above issues

a pilot protection method based on multi-dimensional coordination of transient voltage and full current is proposed. This protection method does not require a large amount of data exchange or precise data synchronization

and can identify the fault section only by sending the fault direction information to the opposite side. In order to verify the performance of the proposed protection method

a flexible HVDC grid is built using PSCAD/EMTDC

and simulations under several fault scenarios are carried out. The results show that the proposed protection can effectively overcome the influence of converter blocking

has a certain capability to withstand fault resistances

and can ensure high reliability while guaranteeing the rapidity and selectivity.

关键词

Keywords

references

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