文档名：基于风速概率分布与风切变指数的直流输电线路离子流场数值模拟方法
摘要：特高压直流(UHVDC)输电线路下方的离子流场是电磁环境的重要评估指标之一.风速作为常见也是影响较大的因素之一,有着明显的地域特点.为了避免资源浪费,在对地高度设计时,应考虑到不同地区的风速分布差异,而不是用过大裕度换取安全度.为此,该文提出一种基于风速概率分布与风切变指数的输电线路离子流场数值模拟方法.该方法通过待计算地区的风速数据构建Weibull风速概率分布函数模型,选择风速数据在95%以内的最大临界风速作为参考值,考虑风速传感器的安装高度,根据风切变指数计算场域不同高度处的风速分布,作为离子流场计算中不同高度节点的风速输入量.结果表明,引入风切变指数后的离子流密度与合成电场强度误差分别下降了16.2百分点和3.8百分点,明显优于传统固定风速模型.并以昆明地区某±800kV直流输电线路为例,采用该方法进行了计算.该方法能够有针对性地考虑输电线路所处区域的风速影响,特别是在高海拔高风速地区,可为输电线路在合成电场安全限值下的对地高度设计提供参考依据.
Abstract：Theionflowfieldunderultrahighvoltagedirectcurrent(UHVDC)transmissionlinesisoneoftheimportantevaluationindicatorsforelectromagneticenvironment.Windspeed,asoneofthemostcommonandinfluentialfactors,hasobviousregionalcharacteristics.Atpresent,scholarsoftenuseconstantwindspeedtoreplacenaturalwindspeed,whichcaneasilyleadtothefollowingtwoproblems.Oneisthewasteofresources,asthelocalwindspeedusedinthecalculationisnotnecessarilyashighaspossible.Every1mincreaseintheheightofthelineinstallationwillsignificantlyincreasethetotalprojectcost.Secondly,itisinconsistentwiththeactualsituation.Duetotherelationshipbetweenwindspeedandheight,thereisagradientrelationshipontheneargroundside.Therefore,theimpactofwindspeedchangesintheverticaldirectionontheionflowfieldshouldbeconsidered.Inviewofthis,thispaperproposesanumericalsimulationmethodoftransmissionlineionflowfieldbasedonwindspeedprobabilitydistributionandwindshearexponent.Thecalculationmethodisdividedintotwoparts:windspeedcalculationandionflowfieldcalculation.ThismethodbuildsaWeibullwindspeedprobabilitydistributionfunctionmodelbasedonthewindspeeddataoftheregiontobecalculated,andselectsthecriticalwindspeedwiththemaxwindspeeddatawithin95%asthereferencevalue.Itconsiderstheinstallationheightofthewindspeedsensor,andcalculatesthewindspeeddistributionatdifferentheightsaccordingtothewindshearexponent,asthewindspeedinputatdifferentheightnodesinthecalculationoftheionflowfield.Theaccuracyofthecalculationmodelaftertheintroductionofwindshearexponentisverifiedthroughoutdoortests.Thevoltagelevelis±800kV,theconductoris6-split,theradiusofthesubconductoris1.68cm,thecross-sectionalareaofthesubconductoris630mm2,theheightoftheconductortothegroundis16.5m,thepolespacingis22m,thealtitudeisabout2000m,andtheweatherissunny.Thewindspeedmeasurementpointis1mabovetheground,andthewindspeedismaintainedbetween0.5～1m/s.Atotalof9measurementpointsarearrangedbelowtheline.Duetothehighaltituderegion,thisarticlealsocorrectedtheparameterssuchasthecoronafieldstrength,ionmobility,andrecombinationcoefficient.Comparedwiththetraditionalwindspeedmodel,aftertheintroductionofthewindshearexponent,theerrorsbetweentheioncurrentdensityandthetotalelectricfieldstrengthdecreasedby16.2%and3.8%,respectively.Theresultsshowthatthemethodismoreconsistentwiththeactualdistribution.Takingtheactualoperating±800kVUHVDCtransmissionlineinKunmingareaasanexample,thismethodwasusedforcalculation.First,tocalculatethewindspeed.TheparametersofWeibullprobabilitydensitydistributionfunctioninKunmingareaobtainedbyfittingare:α=3.5,β=3.172,δ=0.Thecriticalmaximumwindspeedwithinthe95%windspeedrangeoftheprobabilitydistributioncurveiscalculatedtobe4.36m/s.Combinedwiththeheightabovethegroundofthewindspeedsensor,thewindshearexponentisusedtocalculatethewindspeedateachnodeinthesolutionfieldastheinputoftheionflowfieldcalculation.Atthesametime,thispaperalsoprovidescalculatedvaluesfordifferentheightsasacomparison.Theresultsshowthat,undertheconditionthatthetotalelectricfieldstrengthmeetsthestandard,theminimumheightoftheconductorcouldbe20m,whichhasasignificantmargindifferencefromtheactualheightof27.5musedintheactuallinesection.Insummary,themethodproposedinthispapercanspecificallyconsidertheimpactofwindspeedintheareawherethelineislocated,provideareferencebasisforthedesignofthelinetogroundheightunderthesafetylimitofthetotalelectricfield,especiallyinareaswithhighsealevelandhighwindspeed.
作者：岳国华 杜志叶 蔡泓威 修连成Author：YueGuohua DuZhiye CaiHongwei XiuLiancheng
作者单位：武汉大学电气与自动化学院武汉430072
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(9)
分类号：TM723
关键词：特高压直流 离子流场 Weibull分布 风切变指数 数值模拟
Keywords：Ultrahighvoltagedirectcurrent(UHVDC) ionflowfield Weibulldistribution windshearexponent numericalsimulation
机标分类号：TM721.1TM614TM835.4
在线出版日期：2024年5月13日
基金项目：国家自然科学基金基于风速概率分布与风切变指数的直流输电线路离子流场数值模拟方法[
期刊论文] 电工技术学报--2024, 39(9)岳国华 杜志叶 蔡泓威 修连成特高压直流(UHVDC)输电线路下方的离子流场是电磁环境的重要评估指标之一.风速作为常见也是影响较大的因素之一,有着明显的地域特点.为了避免资源浪费,在对地高度设计时,应考虑到不同地区的风速分布差异,而不是用过大裕...参考文献和引证文献
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基于风速概率分布与风切变指数的直流输电线路离子流场数值模拟方法 Numerical Simulation Method of Ion Flow Field in DC Transmission Line Based on Wind Speed Probability Distribution and Wind Shear Exponent
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