文档摘要：阻抗模型是电网换相换流器型高压直流输电系统小信号稳定性分析的重要基础,阻抗模型的准确程度直接影响系统小扰动稳定性分析.该文首先从同步触发原理出发,引入基于单边调制产生的映射函数,该函数蕴含控制及换相信息,可以准确建立换相/非换相期间交直流侧的映射关系;其次,考虑换相动态并通过谐波线性化和傅里叶变换建立完整的直流侧电压和交流侧电流的频域小信号动态模型;再次,考虑控制和换流阀阻尼回路,建立整流侧和逆变侧直流阻抗解析模型;最后,以CIGRE高压直流标准测试模型为例,基于PSCAD/EMTDC平台验证了直流侧阻抗模型的准确性及其用于小扰动稳定性分析的有效性.
Abstract：Withthecontinuousincreaseofthetransmissioncapacityofthelinecommutatedconverterbasedhighvoltagedirectcurrent(LCC-HVDC)systeminthepowergrid,thecouplingstrengthofACandDCcontinuestodeepen,andthestrengthoftheACsystemcontinuestoweaken.TheproblemsofsmalldisturbanceoscillationinstabilityintheLCC-HVDCsystemarebecomingincreasinglyprominent.Duetotheclearphysicalconcepts,impedanceanalysismethodhasbeenwidelyappliedintheresonanceanalysisofLCC-HVDCsystems,andthekeytothismethodistoestablishanimpedancemodel.Theaccuracyoftheimpedancemodeldirectlyaffectsthesmalldisturbancestabilityanalysisofthesystem.ToimprovetheimpedancemodelingaccuracyofLCC-HVDC,thisarticleproposesaDCsideimpedancemodelingmethodbasedonsingle-sidemodulatedmappingfunction,whichsignificantlyimprovestheaccuracyoftheDCsideimpedancemodel.Firstly,startingfromtheprincipleofsynchronoustriggering,amappingfunctionbasedonsingle-sidemodulationisintroduced,whichcontainscontrolandcommutationinformation,andthusaccuratelyestablishesthemappingrelationshipbetweentheACandDCsidesduringcommutation/noncommutation.Then,bycombiningthemappingfunctionwiththeDCsidevoltageandconvertertransformervalvesidecurrentunderdifferentconductionstatesoftheconvertervalve,thedetailedcommutationdynamicsareconsideredandthecompletefrequencydomainsmallsignaldynamicmodelsofDCsidevoltageandACsidecurrentareobtainedthroughharmoniclinearizationandFouriertransform.Furthermore,consideringthedampingcircuitofthecontrolandconvertervalve,establishanalyticalmodelsfortheDCimpedanceoftherectifierandinvertersides.Finally,takingtheCIGREhigh-voltageDCstandardtestmodelasanexample,theaccuracyoftheDCsideimpedancemodelanditseffectivenessinsmalldisturbancestabilityanalysiswereverifiedbasedonthePSCAD/EMTDCplatform.Thefollowingconclusionscanbedrawnfromthesimulationanalysis:(1)Consideringsynchronoustriggeringandaccuratecommutationdynamics,amappingfunctionbasedonsingle-sidemodulationisproposed,whichcanaccuratelyreflecttheAC/DCmodulationrelationshipduringcommutation/noncommutationofLCCconverters.(2)AnalyzedtheinfluenceofcommutationdynamicsandRCcircuitontheDCsideimpedance.TheinfluenceofcommutationdynamicsontheDCsideimpedanceismainlyreflectedinthelowerfrequencyrange,whiletheinfluenceofRCcircuitonitismainlyreflectedinthehigherfrequencyrange.(3)EstablishanaccurateDCsideimpedancemodelthattakesintoaccountfactorssuchasdetailedcommutationdynamics,controllinks,andRCcircuitoftheconvertervalve.Comparedwithexistingswitchfunctionbasedmodelingmethods,thismodelingmethodhashigheraccuracy.
作者：汪娟娟 莫泽 刘岳坤 周盛宇 傅闯 Author：WangJuanjuan MoZe LiuYuekun ZhouShengyu FuChuang
作者单位：华南理工大学电力学院广州510641直流输电技术国家重点实验室(南方电网科学研究院有限责任公司)广州510663
刊名：电工技术学报 ISTICEIPKU
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(13)
分类号：TM712
关键词：电网换相换流器 单边调制 映射函数 换相动态 换流阀阻尼回路 直流侧阻抗
Keywords：Linecommutatedconverter single-sidedmodulation mappingfunction convertervalvedampingcircuit commutationdynamics DCsideimpedance
机标分类号：TM721.1TN92TM614
在线出版日期：2024年7月22日
基金项目：国家自然科学基金基于单边调制映射函数的LCC-HVDC直流侧阻抗精确建模[
期刊论文] 电工技术学报--2024, 39(13)汪娟娟 莫泽 刘岳坤 周盛宇 傅闯阻抗模型是电网换相换流器型高压直流输电系统小信号稳定性分析的重要基础,阻抗模型的准确程度直接影响系统小扰动稳定性分析.该文首先从同步触发原理出发,引入基于单边调制产生的映射函数,该函数蕴含控制及换相信息,可...参考文献和引证文献
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关键词：电网换相换流器,单边调制,映射函数,换相动态,换流阀阻尼回路,直流侧阻抗,
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