基于MVMD-互相关时频域特征的风电变流器开路故障诊断

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中图分类号：TN710-34；TM464 文献标识码：A 文章编号：1004-373X（2025）16-0031-07

Wind power converter open circuit fault diagnosis based on MVMDcross-correlation time-frequencydomain feature

HOURui¹²，LI Ran

（1.CollegeofElectricalEngineering，NorthChina UniversityofScienceandTechnology，TangshanO63210，China; 2.HebeiProvieWindolardrogntoagSafetyoitoigndnteligntOeratioToloovatioenterTangshaia

Abstract：Inalusion totheproblemsof single-opencircuitand double-opencircuit faultsof power tubes in thegrid-side converterof permanentmagnetsynchronouswind generator，a diagnosismethod combining multivariatevariational mode decomposition（MVMD）andcross-correlation time-frequencydomainfeaturesisproposed.Thethre-phasemidpointvoltageof thegrid-sideconverteriscoletedasteoriginaldata.Thethre-phasemidpointvoltageistakenasthethre-chaelputdata ofMVMDandisdecomposed，toobtainseverallayersofintrinsicmodefunctions （IMF）.Bycalculatingthemutualcelaion betweentheoriginalsignaldataandtheIMFfunctionofeachlayer，theIMFthatcanbestreflectthefeaturesandtrendsof the originalsignalisselected，andthenitsaverageenvelopeandtheoriginaldataareextractedintimedomainandfrequency domain.Theobtained featuresareinputintothebidirectionallongshorttermmemory（BiLSTM）networkforthe training， realizingthelocationofthefaultpowertube.Theexperimentalresultsshowthattheproposedmethodcanefectivelyidentifyand classify 22 states of the grid-side converter，and the accuracy of testing set can reach 99.55% ：

Keywords：windturbineconverter;MVMD;time-frequencydomain feature;open circuit fault diagnosis;IMFcomponent; BiLSTM;IGBT

0 引言

近年来，清洁和可再生能源发电受到广泛关注永磁同步发电机（PMSG）通过背靠背变流器实现并网[2，因绕组结构简单、可以简化设备控制等优点，在风能发电领域应用广泛。（剩余7608字）