电力系统及其自动化学报ProceedingsoftheCSU-EPSA第35卷第4期2023年4月Vol.35No.4Apr.2023基于多电容接地方式的低压直流微电网故障定位李英超(国网菏泽供电公司,菏泽274000)摘要:为提高低压直流微电网故障定位的准确性,提高电力系统运行的可靠性,提出一种基于多电容接地方式的低压直流微电网故障定位方法。首先,运用从馈线端子和接地电容器获得瞬时电流和电压,推导了直流微电网一般故障馈线的数学模型。其次,利用基于非线性优化方法的故障测距算法对故障及相关故障电阻进行了精确定位,并通过评估接地电容器在故障期间的响应,计算故障的准确距离。最后,通过搭建直流微电网实验室模型对所提方法的可靠性及有效性进行验证,实验结果表明所提方法具有较高的故障定位准确性。关键词:电容接地;低压直流微电网;故障定位;故障暂态;非线性优化中图分类号:TM721.1文献标志码:A文章编号:1003-8930(2023)04-0059-09DOI:10.19635/j.cnki.csu-epsa.001194FaultLocationforLow-voltageDCMicrogridBasedonMulti-capacitorGroundingSchemeLIYingchao(StateGridHezePowerSupplyCompany,Heze274000,China)Abstract:Toimprovethefaultlocationaccuracyoflow-voltageDCmicrogridandtheoperationreliabilityofpowersys⁃tem,afaultlocationmethodforlow-voltageDCmicrogridbasedonamulti-capacitorgroundingschemeisproposed.First,amathematicalmodelofgeneralfaultfeederinDCmicrogridisderivedaccordingtotheinstantaneouscurrentandvoltageobtainedfromfeederterminalsandgroundingcapacitors.Second,thefaultlocationalgorithmbasedonthenonlinearoptimizationmethodisusedtoaccuratelylocatethefaultandtherelatedfaultresistance,andtheaccuratefaultdistanceiscalculatedbyevaluatingtheresponseofthegroundingcapacitorunderthefault.Finally,thereliabilityandeffectivenessoftheproposedmethodareverifiedbybuildingaDCmicrogridlaboratorymodel,andexperimentalre⁃sultsshowthatthismethodhasahighfaultlocationaccuracy.Keywords:capacitorgrounding;low-voltageDCmicrogrid;faultlocation;faulttransient;nonlinearoptimization当前,碳达峰、碳中和是全球能源治理面临的重要问题,而低压直流微电网有望在促进能源的分配连接和控制方面发挥重要作用,以满足未来低碳能源政策推动的进一步需求[1-2]。为保障低压直流微...