电力系统及其自动化学报2025，Vol.37Issue(7)：79-90,12.DOI:10.19635/j.cnki.csu-epsa.001559
突变量距离保护应用于双馈风机出线相间短路时的改进方法
Improved Method for Applying Transient-based Distance Protection Under Phase-to-phase Short Circuit Faults on Outgoing Line of Doubly-fed Induction Generator
摘要
Abstract
When a transient-based distance protection is applied under the phase-to-phase short-circuit fault occurring on the outgoing line of a doubly-fed induction generator(DFIG),the equivalent positive-sequence impedance of the wind farm will be significantly greater than the negative-sequence impedance,leading to a shortened protection range.Based on a detailed analysis of protection action characteristics under the phase-to-phase short-circuit fault,an im-proved method for setting the transient-based distance protection is proposed by combining the comprehensive equiva-lent impedance.First,the online calculation of equivalent positive-and negative-sequence impedances of the wind tur-bine is performed,thus obtaining the comprehensive equivalent impedance under the phase-to-phase short-circuit fault on the outgoing line of the wind turbine.Second,a correction impedance is introduced to adjust the original setting im-pedance,and this correction impedance is obtained by subtracting the comprehensive equivalent impedance under the phase-to-phase short-circuit fault from the original positive-sequence impedance of the wind turbine.Meanwhile,to pre-vent maloperation of the protection system,it is also crucial to ensure that the correction impedance should remain smaller than the total impedance of the protected line.The effectiveness of the proposed method is validated through PSCAD simulations,indicating that when this method is applied under the phase-to-phase short-circuit fault occurring on the outgoing line of the wind turbine,the protection can act accurately and it also has a stronger capability to with-stand the transition resistance.关键词
双馈风机/序阻抗特性/突变量距离保护/两相相间故障Key words
doubly-fed induction generator(DFIG)/sequence impedance characteristics/transient-based distance pro-tection/phase-to-phase fault分类
信息技术与安全科学引用本文复制引用
侯勇,张尔佳,范春菊,刘虎林,刘中平,邰能灵..突变量距离保护应用于双馈风机出线相间短路时的改进方法[J].电力系统及其自动化学报,2025,37(7):79-90,12.基金项目
国家电网有限公司华东分部科技项目(520800230002) （520800230002）
上海市优秀学术带头人项目(22XD1401400). （22XD1401400）
