第42卷第2期2023年2月ZhejiangElectricPowerVol.42，No.02Feb.25.2023大容量逆变型分布式电源接入对配电网单相接地检测的影响姜淼，石勇，徐光福，侯炜（南京南瑞继保电气有限公司，南京211102）摘要：大容量IIDG（逆变型分布式电源）接入配电网之中会影响单相接地的检测，危害配电网的安全稳定运行。根据IIDG特性和序网理论，给出小电流接地系统中发生单相接地时故障电流和线路零序电流的理论计算方法，得出IIDG的基波和谐波分量会影响故障点电流以及线路零序电流的结论。通过仿真分析了零序电流采样谐波含量高对单相接地判断的影响以及小波包算法对高谐波采样的适应性，说明了含大容量IIDG的配电网中接地选线校核的重要性，得出了基于小波包算法的接地选线算法在IIDG渗透率更高的配电网中适应性较好的结论。关键词：逆变型分布式电源；单相接地故障；序分量；小波包DOI:10.19585/j.zjdl.202302002开放科学（资源服务）标识码（OSID）：AnalysisoftheimpactoflargecapacityIIDGsonsingle-phasegroundingdetectionofdistributionnetworksJIANGMiao，SHIYong，XUGuangfu，HOUWei（NRElectricCo.，Ltd.，Nanjing211102，China）Abstract:Withitsconnectiontodistributionnetworks，theinverter-interfaceddistributedgenerators（IIDGs）affectsingle-phasegroundingdetectionandjeopardizetheirsafeandstableoperation.BasedonthecharacteristicsofIIDGsandsequencenetworktheory，thetheoreticalcalculationmethodoffaultcurrentandzero-sequencecurrentincaseofsingle-phasegroundinginthesmall-currentgroundingsystemisgiven.ItisconcludedthatthefundamentalandharmoniccomponentsofIIDGscaninfluencethecurrentatthefaultpointandzero-sequencecurrentoftheline.Theimpactofthehighharmoniccontentofzero-sequencecurrentsamplingonsingle-phasegroundingjudgmentandtheadaptabilityofwaveletpacketalgorithmtohighharmonicsamplingareanalyzedthroughsimulation.Thesignifi⁃canceofgroundinglineselectionandcalibrationindistributionnetworkscontaininglargecapacityIIDGsisillus⁃trated.Moreover，thegroundinglineselectionalgorithmbasedonthewaveletpacketalgorithmshowsgreateradapt⁃abilityindistributionnetworkswithhigherIIDGpenetration.Keywords:IIDG；single-phasegroundingfault；sequencecomponent；waveletpacket0引言随...
