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时间:2020-03-28
《敏感设备电压暂降严重程度可信性评价测度与方法.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41卷第1期电力系统保护与控制Vo1.41NO.12013年1月1日PowerSystemProtectionandControlJan.1.2013敏感设备电压暂降严重程度可信性评价测度与方法刘旭娜,肖先勇,徐方维,魏晓天,杨景岗(1.四川大学电气信息学院,四川成都610065;2.乐山电力股份有限公司,四川乐山614000)摘要:为准确刻画电压暂降对敏感设备的严重程度,从设备响应的物理属性出发提出了满足设备响应状态不可加性时评价暂降严重程度的可信性测度,弥补经典概率测度和模糊测度需要大量样本、具有非对偶性等问题。利用
2、模糊统计和多项式拟合法构造设备响应状态不确定区域内各暂降特征对应的设备耐受能力隶属函数,基于不确定性理论得到联合可信性分布函数,以此建立设备电压暂降严重程度评估模型。以实测样本为依据,对个人计算机(personalcomputerS,PC)进行仿真,并与经典概率测度和可能性测度评估结果进行比较,证明了可信性测度的正确性和可信性,评估结果更符合实际。关键词:电压暂降;非对偶性;不可加性;可信性测度;联合可信性分布;不确定性理论Credibilitymeasureandassessmentmethodofsensitiveeq
3、uipmentvoltagesagseverityLIUXu—na,XIAOXian—yong,XUFang—wei,WEIXiao-tian,YANGJing—gangz(1.SchoolofElectricalEngineeringandInformation,SichuanUniversity,Chengdu610065,China;2.LeshanElectricPowerIncorporatedCompany,Leshan614000,China)Abstract:Inordertoaccuratelydescr
4、ibetheequipments’severitycausedbyvoltagesag,thecredibilitymeasurewhichmeetstheconditionsofnon—additiveisproposedbasedontheirphysicalpropertiesofresponses.Thisassessmentmeasurecanavoidthedeficienciesthatclassicalprobabilitymeasureneedsalargenumberofsamplesandthenon
5、—dualityoffuzzymeasure.Themembershipfunctionofsensitiveequipmentvoltagetolerancecapabilitycorrespondingtothecharacteristicquantitiesinthestatusuncertainareaisdeterminedbyfuzzystatisticalmethodandpolynomialfittingmethod.Thenthejointcredibilitydistributionfunctionis
6、deducedbasedonuncertaintytheory.Hence,theassessmentmodelofseverityofequipmentsfailureisconstructed.Basedonpracticalsamples,thePCsaresimulatedusingtheproposedmethod.Comparingthesimulationresultswiththoseofmethodsusingclassicalprobabilitymeasureandpossibilitymeasure
7、,itprovesthattheproposedmethodisproperandcredibleandcanreflectpracticalconditionmoreobjectively.ThisworkissupposedbyNationalNaturalScienceFoundationofChina(No.50877049).Keywords:voltagesag;non—duality;non—additive;credibilitymeasure;jointcredibilitydistributionfun
8、ction;uncertaintytheory中图分类号:TM71文献标识码:A文章编号:1674—3415(2013)01—0190—07价测度与方法。0引言电压暂降严重程度是受影响设备的电压耐受由于对设备的影响和造成的损失巨大,电压暂能力与供电侧电压暂降水平之间的兼容问题,受系降被认为是最严重的电能
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