两端高压直流输电系统的稳定性分析

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1、应用网络阻尼规则的两终端高爪直流输电系统的稳定性分析Abstract—Thispaperperformsafrequency-domaininvestigationintwo-terminalVoltage-SourceConverterHVDC(VSCHVDC)systcms.focusingontheuseofthenet-dampingcritcriontoinvestigatepoorly-dampedconditionsandclosed-loopstability.Thesystemisrepresentedasafeedbackinterconnect

2、ionoftwosubsystems,definedinthispaperasa)adc-gridinputimpedanceandb)aVSCinputadmittance・Thedampingcharacteristicsofthetwosubsystemsaredefinedatcriticalfrequenciesandtheirseparatecontributiontotheclosed-loopstabilityisassessedbythcnet-dampingcriterion.Avarietyofstudycasesdemonstratesthe

3、effectivenessofthelatterasapowerfilltoolforstabilityinvestigation,whileacorrelationhasbeenderivedbetweenthcnct-dampingvalueandthedampingfactorofthepoorly-dampedpolesofthesystem.摘要：这篇文章通过频域调查两终端电压源换流器的轻型直流输电(VSCHVDC)系统，重点研究网络阻尼标准低阻尼条件和闭环稳定使用。该系统为二反馈连接，▲文定义为a)宣流电网输入阻抗b)—-个直流输入通道。两个子系统的阻尼

4、特性在临界频率和他们单独对闭环稳泄性的作用的的净阻尼估算中定义。不同的的研究案例说明了后者的有效性作为稳定性研究的有力工貝，而它们之间的相关性说明了净阻尼和低阻尼系统极点的阻尼因子的关系。IndexTerms—VSC-HVDC,netdamping,dc-networkstability,poordamping,frequencydomainanalysis・关键字：轻型直流输电，净阻尼，直流网稳定性，低阻尼，频域分析。I.INTRODUCTION引言oneoftheproblemsthatcangenerallybeobservedindynamicsystems

5、isthepotentialoccurrenceofpoorly-dampedoscillationsfollowingdisturbances.ThisisofgreatconcernforHVDCapplications,wheretheratingsandcomplexityleveldemandstrictavoidanceofsuchevents・TheintroductionofVoltagc-SourccConverters(VSC)hasofferedgreatcontrollabilitytotheapplicationsused・However,

6、uncontrolledinteractionsbetweenthedifferentcomponentsofaVSC-HVDCsystemmightappear,compromisingthedynamicperfonnanceofthesystemand,intheworstcase,itsstability.动态系统中一个可觉察的问题是传输过程中潜任的低阻尼底荡。这是一个广受关注的髙压直流输电系统的应用，在这里额泄功率和复杂度耍求极力避免这样的问题。电圧源变换器(VSC)的引用提供了高度可控性的应用。然而，一个高压直流输电系统的各个部分会相互影响出现失控，以至

7、于干扰系统的动态特性，甚至是稳定性。Stabilitystudiesaretypicallyapproachedbyusingnumericalanalysistodeterminetheactualvaluesofthesystem'spoles[1].Alternativesolutionsmayhoweverofferadifferentperspectivetotheunderstandingofstabilityandpoordamping.Afrequencydomainapproachisproposedin[2][3]andutilizedint