感应发电机接入配网三相短路电流峰值评估

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1、第41卷第18期电力系统保护与控制Vol_41No．182013年9月16日PowerSystemProtectionandControlSep．16，2013感应发电机接入配网的三相短路电流峰值评估王达达，张少泉，陈晓云，罗艾青，王强钢，谢光莉，周念成(1．云南电力试验研究院(集团)有限公司，云南昆明650217；2．输配电装备及系统安全与新技术国家重点实验室(重庆大学)，重庆400044)摘要：短路电流计算是分布式发电接入配网规划和保护的基础。研究感应发电机(IG)的故障暂态特性，利用IG静态等值电路推导出配网三相短路时其定子短路电流的解析表达式，

2、进而比较配网近端和远端短路情况下的IG三相短路电流，分析IG转子和定子磁链强制分量比例系数特性，研究IG转速变化对其短路电流直流分量和周期分量的影响。根据配网短路故障后IG转速的变化规律，提出IG接入配网的三相短路电流峰值评估方法。采用PSCAD／EMTDC仿真软件中IG的5阶动态模型仿真验证了该方法的正确性。关键词：短路电流；峰值；鼠笼式感应发电机；转速；配网Evaluationofcurrentpeakofthree—phaseshortcircuitforinductiongeneratorintegratedintodistributionne

3、tworkWANGDa．da，ZHANGShao．quan，CHENXiao—yun，LUOAi—qing，WANGQiang．gang，XIEGuang．1i，ZHOUNian—cheng2(1．YurmanElec~icPowerTest&ResearchInstitute(Group)Co．，Ltd，Kunming650217，China；2．StateKeyLaboratoryofPowerTransmissionEquipment&SystemSecurityandNewTechnology,Chongqing400044，China)Abs

4、tract：Thecalculationofshortcircuitcurrentisanimpoaantfoundationforfaultanalysisofpowersystemintegratedintodistributedgeneration．Firstly,thetransientcharacteristicsofinductiongenerator(IG)areinvestigated，andtheanalyticformulaofitsstatorcurrentunderthree-phaseshortcircuitindistrib

5、utionnetworkisderivedmakinguseofthesteady-stateequivalentcircuitofIG．Thenthethree—phaseshortcircuitcurrentsofIGarecomparedanddiscussedwhentheshortcircuitOccursneartoandfarfromit．Subsequently,accordingtothecharacteristicofforcedcomponentproportionbetweenstatorfluxandrotorfluxofIG

6、theimpactsofitsrotorspeedondirect-currentandperiodiccomponentsarestudied．Finally,anevaluationmethodtodeterminethecurrentpeakofthree—phaseshortcircuitforinductiongeneratorindistributiongridisproposedbasedonthechangelawofIGrotorspeedunderthegridfault．Thecorrectnessoftheproposedmet

7、hodisverifiedbythefifthelectromagnetictransientmodelofIGinPSCAD／EMTDCsimul~ionsoftware．ThisworkissupposedbyNationalNaturalScienceFoundationofChina(No．51277184)．Keywords：shortcircuitcurrent；peakvalue；squirel-cagerotorinductiongenerator；rotorspeed；distributionnetwork中图分类号：TM715文献标

8、识码：A文章编号：1674．3415(2013)18—0025—07同容量时机组小、维护要求低