电子测量技术ELECTRONICMEASUREMENTTECHNOLOGY第45卷第23期2022年12月DOI:10.19651/j.cnki.emt.2209923基于内模控制的逆变器并离网无缝切换策略研究曹坤艾永乐李港星(河南理工大学电气工程与自动化学院焦作454003)摘要:针对逆变器在并离网切换过程中存在电压畸变、冲击电流等问题,提出了一种基于虚拟同步发电机(VSG)控制和电压电流内模控制(IMC)的并离网无缝切换控制策略。首先,建立了逆变器整体控制结构以及数学模型。其次,设计了基于内模控制的电压电流双环控制结构,并对内模控制器进行参数整定。再次,采用基于电压幅值和相位的预同步控制方法使逆变器能在两种运行模式之间平滑切换,切换瞬间电压电流波形稳定,能实现平滑过渡。最后,通过Matlab/Simulink仿真验证了所提出控制策略的有效性。关键词:内模控制;虚拟同步发电机;无缝切换;预同步中图分类号:TM464文献标识码:A国家标准学科分类代码:470.40Researchonseamlessswitchingstrategyofinverterbetweeengrid-connectedandoff-gridbasedoninternalmodelcontrolCaoKunAiYongleLiGangxing(SchoolofElectricalEngineeringandAutomation,HenanPolytechnicUniversity,Jiaozuo454003,China)Abstract:Thispaperpresentsaseamlessswitchingcontrolstrategybasedonvirtualsynchronousgenerator(VSG)controlandvoltageandcurrentinternalmodelcontrol(IMC)forvoltagedistortionandimpulsecurrentintheswitchingprocessbetweeengrid-connectedandoff-gridoftheInverter.Firstly,thecontrolstructureandmathematicalmodeloftheinverterareestablished.Secondly,thecontrolstructurewithvoltageandcurrentdouble-loopbasedonIMCisdesignedandtheparametersofinternalmodelcontrollerareadjusted.Thirdly,thepre-synchronizationcontrolmethodbasedonamplitudeandphaseofthevoltageisadoptedtoenabletheinvertertoswitchsmoothlybetweenthetwomodels,andthetransientvoltageandcurrentofswitchingisstable,whichrealizesthesmoothtransition.Finally,theeffectivenessoftheproposedcontrolstrategyisverifiedbytheMatlab/Simulinksimulation.Keywords:internalmodelcontrol;virtualsynchronousgenerator;seamlessswitching;pre-synchronization收稿日期:2022-05-120引言由于环境污染和资源匮乏问题的愈发严重,近年来由分布式能源组成的微电网受到了很多关注,并且得到了大量应用[1-2]。微电网可以运行在并网和离...
