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1、摘要高压直流输电在输电领域中是一个较新且较活跃的领域之一,它在远距离大功率输电及大区域电网并联方面起到了至关重要的作用。我国目前已有十多项高压直流输电工程投入运行,它们在国家电力网络构架中起到了优化网络的能源配置、保障国家的能源安全、以及促进国民经济的发展方面起到了重要的作用。本文围绕直流输电工程需要吸收无功做足分析计算及讨论。在高压直流输电工程中,利用普通晶闸管换流阀对高压直流输电换流站进行换流的,一般情况下采用电网电源的换相技术,但是这种方法的特点是当换流器在运行时需要从电网中吸收大量的无功功率。为了保证换流站和交流系统的稳定性,我们需要对换流站的无功消耗、
2、无功补偿、及无功平衡进行分析和计算。本文重点分析研究高压直流输电换流器吸收无功的机理、影响因素以及对换流器进行无功补偿的分析讨论。在Matlab或PSCAD/EMTDC仿真软件上建立高压直流输电系统的仿真模型,利用所建的仿真模型,仿真计算高压直流输电换流器对无功方面的要求和关系。并对上述仿真结果进行分析、比较,给出合理解释,并提出高压直流输电无功补偿的合理化建议。关键词:高压直流输电,无功功率,无功补偿,换流器,仿真建模29ABSTRACTInthefieldoftransmission,HVDCisanewandactivearea,itisinlong-di
3、stancepowertransmissionandlargeregionalgridparallelhasplayedacrucialrole.Chinacurrentlyhasmorethanadozenhigh-voltagedirectcurrenttransmissionprojectputintooperation,theyareinnationalelectricitynetworkarchitectureoptimizedenergynetworkconfiguration,ensuringnationalenergysecurity,andpr
4、omotingthedevelopmentofthenationaleconomyplaysanimportantrole.ThispaperfocusesontheDCtransmissionprojectneedstoabsorbreactivepowertohaveenoughanalysis,discussionandcalculation.InHVDCtransmissionproject,thecommutationforHVDCconverterstationwiththeuseofordinarythyristorvalves,forundern
5、ormalcircumstances,usingmainspowersupplycommutationtechnology,butthecharacteristicsofthismethodisthatwhentheconverteratruntimeneedtoabsorbalargeamountofreactivepowerfromthegrid.Toensuretheconverterstationandcommunicationsystemstability,weneedtogiveconverterstationreactivepowerconsump
6、tion,reactivepowercompensation,andreactivepowerbalanceanalysisandcalculations.ThispaperfocusesonanalysisofHVDCconverterabsorbsreactivemechanism,influencingfactorsandtheanalysisanddiscussionofreactivepowercompensationoftheconverter.InMatlabsimulationsoftwaretobuildHVDCsystemsimulation
7、model,usingthebuiltsimulationmodel,simulationHVDCconverter'srequirementsandrelationshipsofreactivepower.Thesimulationresultswereanalyzedandcompared,givenareasonableexplanation,andproposedHVDCreactivepowercompensationrationalizationproposals.KEYWORDS:HVDC,Reactivepower,converter,react
8、ivepowercomp