中国电机工程学报2024，Vol.44Issue(5)：1789-1801,中插10,14.DOI:10.13334/j.0258-8013.pcsee.221805
风电场集电线路单相接地故障柔性电压消弧与动态保护新原理
A New Principle of Flexible Voltage Arc Suppression and Dynamic Protection for Single Phase Grounding Faults of Wind Farm Collector Line
摘要
Abstract
To solve the long-standing problem of single-phase grounding fault treatment of the collector line in wind farm collector system,a flexible grounding mode of wind farm is proposed.The three-sequence equivalent circuit of flexible grounding wind farm and composite sequence network of single-phase grounding fault are derived.A novel method of flexible voltage arc suppression based on zero-sequence voltage flexible control is proposed,which can actively suppress the fault voltage and fault residual current to zero to realize reliable arc suppression.Furthermore,a high-resistance fault identification and protection method based on dynamic increment of zero-sequence current is proposed.The fault residual current is gradually amplified by regulating the zero-sequence current to realize the sensitive detection and protection of permanent grounding fault.A large-scale wind farm model with doubly-fed induction generator(DFIG)is established in PSCAD/EMTDC,the simulation results under various fault conditions show that the method can control the fault voltage of the collector line considering system unbalanced voltage.It realizes arc suppression of transient single-phase grounding fault,dynamically detects and suppresses the residual current of permanent grounding fault,and achieves protection of high-resistance grounding fault of the collector line.This technology is expected to improve the operation flexibility and fault defense ability of wind farm,and effectively guarantee the continuity and reliability of new energy power delivery.关键词
集电线路/柔性接地/单相接地故障/电压消弧/动态保护Key words
collector line/flexible grounding/single-phase grounding fault/voltage arc suppression method/dynamic protection分类
信息技术与安全科学引用本文复制引用
喻锟,杨理斌,曾祥君,王沾,李理,卓超..风电场集电线路单相接地故障柔性电压消弧与动态保护新原理[J].中国电机工程学报,2024,44(5):1789-1801,中插10,14.基金项目
国家自然科学基金项目(52177070) （52177070）
湖南省自然科学基金项目(2021JJ30729) （2021JJ30729）
湖南省教育厅科学研究项目(22A0231). Project Supported by National Natural Science Foundation of China(52177070) （22A0231）
Natural Science Foundation of Hunan Province(2021JJ30729) （2021JJ30729）
Science and Technology Project of Hunan Education Department(22A0231). （22A0231）
