提升并网逆变器在弱电网下稳定性的惯性锁相环策略

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中图分类号：TN911.8-34；TM464 文献标识码：A 文章编号：1004-373X（2025）20-0056-07

引用格式：.提升并网逆变器在弱电网下稳定性的惯性锁相环策略[J].现代电子技术,2025,48（20)：56-62.

Inertial phase-locked loop strategy for improving stability of grid-connected inverterinweak grid

LUWenwen,YUShaojuan,LIULiqun (SchoolofElectronicInformationEnginering,TaiyuanUniversityofScienceandTechnology,TayuanO3OO24,China)

Abstract：In allusion tothepoor stabilityof photovoltaic power generationsystem underweak gridconditions due to low dampingandlowinertiaofphase-lockedlop (PLL）grid-connectedinverters,anew-type inertiaphase-lockedloo (IPLL) structureisproposedtonhancesystemstabilityThemaincircuittopologyofathree-phaseLC-filtergrid-connectedinverteand thePLLcontrolloopunderweak gridconditionsare introduced.Byintroducing inertialcontrol parameters toimprovesystem dampingandinertia,anew-typeIPLLstructureisproposed,anditsmathematical modelisestablishedtoanalyzeitsunitstep responsecharacteristicsTheffectivenessoftheIPLLinenhancingsystemstabilityisverifiedbythesimulationsand experiments.Thesimulationresultsshowthatthenew-typeIPLcansignificantlyimprovethestabilityofgrid-coected invertersunderdiffrentshort-circuitratioconditions，reducingtheamplitudeofvoltageandcurrentoscilations.The experimentalresultsshowthatincomparisonwith traditionalPLL,IPLLcanachievesystemstabilityfasterunderweak power gridandextremelyweakpowergridconditions,andsignificantlyimprovethesystem'santi-disturbanceabilityandrobustss.It furtherverifies the effectiveness of IPLL.

Keywords:grid-conected inverter;stabilityanalysis;weak grid;phase-lockedloop;short-circuitratio;unit stepresponse

0 引言

近年来，光伏发电较多地应用于电力系统，以减少传统化石燃料的消耗。（剩余12269字）