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时间:2020-03-28
《基于自组织临界理论的电网脆弱线路辨识.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第44卷第15期电力系统保护与控制vo1.44NO.152016年8月1日PowerSystemProtectionandControlAug.1,2016D0I:10.7667/PSPC152138基于自组织临界理论的电网脆弱线路辨识岳贤龙,王涛,顾雪平,李凯,张尚,王铁强(1.华北电力大学新能源电力系统国家重点实验室,河北保定071003;2.河北电力调度通信中心,河北石家庄050021)摘要:为了辨识引发电力系统连锁故障的脆弱线路,从事故发展的角度出发,基于自组织临界理论的幂律特性构建了电网脆弱线路
2、辨识模型。线路因保护的隐藏故障或过载而退出运行后,利用孤岛搜索辨识引发系统解列的关键线路,并对其处理以便重新潮流计算。综合改进的潮流分布熵、灵敏度分析理论及OPF模型对负荷水平和发电机出力进行调整,构成电网停电模拟模型。通过大量的仿真与统计,利用系统负荷损失量的幂律或幂律尾特性判断系统是否达到临界状态,同时,系统负荷损失量的数学期望越高,该白组织临界状态越危险,致使连锁故障的风险越高。以IEEE39节点系统为仿真算例,验证了方法的正确性和有效性。关键词:脆弱线路;自组织临界理论;改进的潮流分布熵;停电模拟
3、;孤岛搜索;灵敏度分析Vulnerablelineidentificationofpowergridbasedonself-organizingcriticaltheoryYUEXianlong,WANGTao,GUXueping,LIKai,ZHANGShang,WANGTieqiang(1.StateKeyLaboratoryofAltemateElectricalPowerSystemwithRenewableEnergySources,NorthChinaElectricPowerUniversi
4、ty,Baoding071003,China;2.HebeiPowerDispatchandCommunicationCenter,Shijiazhuang050021,China)Abstract:Inordertoidentifyvulnerablelineswhichleadtocascadingfailureofpowersystem,theidentificationmodelisproposedbasedonthepowerlawcharacteristicoftheself-organizi
5、ngcriticaltheoryfromtheperspectiveofthedevelopingtrendoftheaccident.Whenlineisoutofserviceduetooverloadorhiddenfailuresinprotectionsystem,criticallinescausingpowersystemseparationCalbefoundbasedontheislandsearchmethod,andislandswillbeprocessedtobeconvenie
6、nttopowerflowcalculation.Thesimulationmodelofpowersystemblackoutsisbuiltconsideringtheimproveddistributionen~opyofpowerflowandthetheoryofsensitivityanalysistoadjustloadlevel,andtheOPFmodeltoadjustgeneratoroutput.Throughalotofsimulationandstatistics,thepow
7、erlaworpowerlawtailcharacteristicoflossloadofpowersystemcanbeusedtodeterminewhetherthesystemreachestheself-organizingcriticalstate.Whilethemathematicalexpectationoflossloadishigher,theself-organizedcriticalstateismoredangerous,andtheriskofcascadingfailure
8、ishigher.TheefectivenessofthismethodinidentifyingvulnerablelinesofpowergridhasalsobeenverifiedbysimulationresultsofIEEE39一bussystem.ThisworkissupportedbyNationalNaturalScienceFoundationofChina(No.51277076)andFundame
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