第24卷第6期2023年6月电气技术ElectricalEngineeringVol.24No.6Jun.2023默蒂亚里-拉合尔工程低频振荡分析李艳梅魏巍肖龙张艳浩鲁庆华(许继电气股份有限公司,河南许昌461000)摘要本文对默蒂亚里-拉合尔高压直流输电工程现场交流系统出现的0.6Hz低频振荡现象进行分析。通过交流等效网络模拟实际的交流系统振荡,对频率控制和双侧频差调制两种策略进行实时数字仿真和分析发现,当交流系统受到大扰动产生低频振荡时,频率控制功能不能起到很好的阻尼效果,系统振荡幅度越来越大;双侧频差调制可以产生一定正阻尼,进而抑制低频振荡,系统振荡幅度逐渐衰弱。因此,建议在工程中添加双侧频差调制用于抑制低频振荡。关键词:低频振荡;高压直流(HVDC)输电;抑制策略;实时数字仿真(RTDS)AnalysisoflowfrequencyoscillationinMatiari-LahoreprojectLIYanmeiWEIWeiXIAOLongZHANGYanhaoLUQinghua(XJElectricCo.,Ltd,Xuchang,He’nan461000)AbstractThisarticleanalyzesthe0.6Hzlowfrequencyoscillationphenomenonintheon-siteACsystemoftheMatiari-Lahorehighvoltagedirectcurrent(HVDC)project.TheACequivalentnetworkisusedtosimulatetheactualoscillationofACsystem,andthetwostrategiesoffrequencycontrolandbilateralfrequencydifferencecontrolaresimulatedandanalyzedinrealtimedigitalsimulation(RTDS).ItisfoundthatwhentheACsystemissubjectedtolargedisturbanceandproduceslowfrequencyoscillation,thefrequencylimitingfunctioncannotplayagooddampingeffectandtheoscillationamplitudebecomeslargerandlarger.Bilateralfrequencydifferencemodulationcanproduceacertainpositivedamping,thenthelowfrequencyoscillationisrestrained,theoscillationamplitudegraduallyweakens.Therefore,addingbilateralfrequencydifferencecontroltosuppresslowfrequencyoscillationintheprojectissuggested.Keywords:lowfrequencyoscillation;highvoltagedirectcurrent(HVDC)transmission;suppre-ssionstrategy;realtimedigitalsimulation(RTDS)0引言随着社会用电需求的不断增加,电力系统规模和结构日趋庞大、复杂,电力系统能否平稳运行面临着巨大的挑战。特别是远距离、大容量输电线路与弱联系电网的并联运行,导致区域间的阻尼特性降低,引发联络线功率振荡[1]。由于振荡频率一般在0.1~2.0Hz之间,与电网额定频率相比较低,所以称之为低频振荡。...