中国电机工程学报2024，Vol.44Issue(15)：5899-5907,中插5,10.DOI:10.13334/j.0258-8013.pcsee.230326
针对海上风电场汇集线路单相接地故障的柔直侧新型距离保护方案
A Novel MMC-side Distance Protection Scheme for Single-phase Grounding Fault of Offshore Wind Farm Collection Line
晁晨栩 1郑晓冬 1叶海 2刘中平 2刘虎林 2韩俊 2张怀宇 3邰能灵1
作者信息
- 1. 电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市 闵行区 200240
- 2. 国家电网有限公司华东分部,上海市 浦东新区 200120
- 3. 国家电网有限公司西南分部,四川省 成都市 610095
- 折叠
摘要
Abstract
When a single-phase grounding(SPG)fault occurs in the offshore wind farm collection line,the short-circuit current on both sides of the collection line is provided by the wind turbine inverter(WTI)and the modular multilevel converter(MMC),respectively.Since the positive-,negative-,and zero-sequence networks are connected in series,the positive-,negative-,and zero-sequence currents show the characteristics of limited amplitude and controlled phase.The MMC-side distance protection cannot identify the SPG fault.This paper establishes the composite sequence network,and analyzes the fault characteristics when the SPG fault occurs in the collection line.Then the zero-sequence current at WTI-side is calculated through the negative-and zero-sequence currents at MMC-side without communication.Based on this,the equation about the fault distance is constructed,and a novel MMC-side distance protection scheme is proposed,effectively addressing the issue of the performance degradation of distance protection of line with inverter-based sources on both ends.The proposed protection scheme is less affected by the reactive power support strategy and the fault resistance.And the test results show that the proposed protection scheme can accurately identify internal and external SPG faults.关键词
海上风电场/柔性直流换流站/汇集线路/距离保护/单相接地故障/过渡电阻Key words
offshore wind farm/flexible DC converter station/collection line/distance protection/single-phase grounding fault/fault resistance分类
信息技术与安全科学引用本文复制引用
晁晨栩,郑晓冬,叶海,刘中平,刘虎林,韩俊,张怀宇,邰能灵..针对海上风电场汇集线路单相接地故障的柔直侧新型距离保护方案[J].中国电机工程学报,2024,44(15):5899-5907,中插5,10.
