第50卷第4期2023年4月Vol.50,No.4Apr.2023湖南大学学报(自然科学版)JournalofHunanUniversity(NaturalSciences)一种适用于混合三端直流系统的纵联保护方案高淑萍1,沈渠旺1†,宋国兵2(1.西安科技大学电气与控制工程学院,陕西西安710054;2.西安交通大学电气工程学院,陕西西安710049)摘要:为提升多端系统的输电可靠性,提出一种基于Mann-Kendall检验法的混合三端直流输电线路纵联保护方法.该方法利用T接汇流母线三端电流故障分量判定故障发生区域;再利用Mann-Kendall检验法对故障区域内线路两端电流的变化趋势进行分析,进而实现故障类型的判别以及故障极的选择;最后,通过PSCAD/EMTDC搭建模型并对不同故障情况进行仿真,使用MATLAB对所提保护方法进行仿真验证.仿真结果表明:不同故障情况下,所提方法均可在2.5ms内可靠动作,速动性好,并且具有较强的抗噪声干扰能力以及耐过渡电阻能力.关键词:混合三端直流输电线路;Mann-Kendall检验法;相模变换;故障电流;继电保护中图分类号:TM773;TM75文献标志码:AAPilotProtectionSchemeforHybridThree-terminalDCSystemsGAOShuping1,SHENQuwang1†,SONGGuobing2(1.SchoolofElectricalandControl,Xi’anUniversityofScienceandTechnology,Xi’an710054,China;2.SchoolofElectricEngineering,Xi’anJiaotongUniversity,Xi’an710049,China)Abstract:Toimprovethetransmissionreliabilityofmulti-terminalsystems,thispaperproposesahybridthree-terminalDCtrans-missionlinepilotprotectionmethodbasedontheMann-Kendalltestmethod.ThemethodusestheT-connectedbusthreeterminalcurrentfaultcomponenttodeterminethefaultarea,thenusestheMann-Kendalltestmethodtoanalyzethechangingtrendofthecurrentatbothendsofthelineinthefaultarea,andrealizesthefaulttypeidentificationandthefaultpoleselection.Finally,themodelisbuiltinPSCAD/EMTDCanddifferentfaultconditionsaresimulated,andtheproposedprotectionmethodisverifiedwithMATLAB.Simulationresultsshowthattheproposedmethodcanoperatereliablywithin2.5msundervariousfaultconditions,withgoodquick-action,andhasstrongresistancetonoiseinterferenceandtransitionresistance.Keywords:hybridthree-terminalDCtransmissionlines;Mann-Kendalltestmethod;phase-modetransforma⁃tion;electricfaultcur...