东北电力技术2026，Vol.47Issue(3)：14-19,6.
真双极柔性直流电网中性区域金属性接地故障保护策略
Protection Strategy for Neutral Area Metal Ground Fault of True Bipolar VSC Based DC Grid
李金卜 1张荣博 2王卫龙 1陈思宇 3杨杰1
作者信息
- 1. 国网冀北电力有限公司超高压分公司,北京 102488
- 2. 合肥工业大学电气与自动化工程学院,安徽 合肥 230041
- 3. 国网冀北电力有限公司工程管理分公司,北京 100160
- 折叠
摘要
Abstract
When the fault occurs in the neutral region of the voltage source converter(VSC)based DC grid with true bipolar structure,the fault current may be very small,and the traditional differential protection cannot identify the fault.For the above problem,it first-ly analyzes the fault characteristics of four-terminal VSC based DC grid neutral zone,and the working principles of the metal loop monitoring device and introduces the grounding resistance and impedance monitoring device.Combined with the pole control protection device,it proposes a protection strategy for the neutral area metal ground fault of the true bipolar VSC based DC grid,by adjusting the bipolar operation status and system ground to increase the fault current,so that it enables the protection to act and isolate the fault.Fi-nally,it establishes a four-terminal VSC based DC grid model through MATLAB,which verifies the effectiveness of this strategy for the neutral area metal ground fault of the true bipolar VSC based DC grid.关键词
柔性直流电网/中性区域接地故障/金属回线监视/接地电阻阻抗监视Key words
VSC based DC grid/neutral grounding fault/metal loop monitoring device/grounding resistance and impedance moni-toring device分类
信息技术与安全科学引用本文复制引用
李金卜,张荣博,王卫龙,陈思宇,杨杰..真双极柔性直流电网中性区域金属性接地故障保护策略[J].东北电力技术,2026,47(3):14-19,6.
