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时间:2020-03-28
《基于改进电气介数的关键线路辨识.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42卷第6期华北电力大学学报Vo1.42.No.62015年11月JournalofNorthChinaElectricPowerUniversityNOV.,2015doi:10.3969/j.ISSN.1007—2691.2015.06.04基于改进电气介数的关键线路辨识徐岩,郅静(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)摘要:为提高电力系统运行安全水平,提出一种基于改进电气介数的关键线路辨识方法。推导出线路功率变量与节点注入功率变量之间的功率灵敏度矩阵,以该矩阵为基础,考虑线路负载率、不同节点发
2、电量和负荷水平的影响,定义改进电气介数指标识别电网的关键线路。利用加权潮流分布熵反映线路断开对系统线路负载率分布及运行安全水平的影响。改进电气介数计算简单,克服了以往介数指标假设节点间功率按最短路径传输的不足,同时考虑了线路中潮流的方向性。加权潮流分布熵很好地反映了系统中部分线路负载率偏高甚至过载而导致的潮流分布不均衡。在IEEE39节点系统中对该方法进行验证,结果表明利用改进电气介数可有效识别断开后导致系统线路负载率分布不均衡的关键线路。关键词:电力系统;关键线路;改进电气介数;加权潮流分布熵中图分类号:TM711文献标识码
3、:A文章编号:1007—2691(2015)06—0024—05Identificati0n0fKevLinesBasedonImprovedElectricBetweennessXUYan,ZHIJing(StateKeyLaboratoryofAlternateElectricalPowerSystemwithRenewableEnergySources,NoahChinaElectricPowerUniversity,Baoding071003,China)Abstract:Toimprovetheoperationsa
4、fetylevelofthepowersystem,thispaperputsforwardanidentificationmethodofkeylinesbasedonimprovedelectricbetweenness.Accordingtothisidentificationmethod,thepowersensitivityma—trixbetweenlinepowervariableandnodalinjectionpowervariableisderived.Thenbasedonthematrixandcons
5、ider—ingthelineloadratio,generatingcapacityandloadlevel,thispaperdefinestheidentifiedkeylinesbasedontheim—provedelectricbetweenness.Next,theweightedpowerdistributionentropyisemployedtoreflecttheeffectontheloadratedistributionandtheoperationsafetylevelofthelinediscon
6、nection.Itisfoundthat,ononehand,thesimplecal-culationofimprovedelectricbetweennesscanovercometheshortcomingsofthepreviousbetweennessindexeswhichas-sumethatthepowergoesthroughtheshortestpathbetweennodes,andontheotherhand,italsotakesthedirectionofpowerintoconsideratio
7、n.Theweightedpowerdistributionentropycanreflecttheunevendistributionofpowercausedbythehighsystemloadrateorevenoverload.ThesimulationintheIEEE39bussystemshowsthattheimprovedelectricbetweennesscaneffectivelyidentifythekeylineswhichleadtolineloadratiounbalanceddistribu
8、tionafterbeingdis—connected.Keywords:powersystem;keylines;improvedelectricbetweenness;theweightedpowerdistributionentropy0引言收稿日期:2015-03-2
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