ElectricalAutomation73AutomaticControlSySystem&Equipment自动控制系统与装置《电气自动化》2023年第45卷第4期LCL型逆变器并网适应性主动提升控制系统史沁鹏，王亮，贾江涛，张楠（中国电力工程顾问集团华北电力设计院有限公司，北京100120）摘要：为提升LCL型逆变器在不同电网短路比下的并网适应性，通过阻抗分析方法，揭示了LCL型逆变器系统在低电网短路比工况下的不稳定机理。提出了一种基于并网电流反馈的虚拟阻抗控制策略，有效改善了LCL型逆变器输出阻抗在面对不同电网短路比下的阻抗稳定裕度。所提出的控制策略在实现方法上仅需引人一个高通滤波器，具有实现简单、抗噪声能力强等特点。最后基于所搭建的5kW单相LCL型并网逆变器样机，充分验证了所提控制系统对于提升LCL型逆变器并网适应性的正确性和有效性。关键词：并网适应性；并网逆变器；虚拟阻抗；电网短路比；稳定性分析；相位补偿；控制策略D0I:10.3969/j.issn.1000-3886.2023.04.023[［中图分类号]］TM614［文献标志码］A［文章编号］1000-3886（2023)04-0073-04LCLInverterGrid-connectedAdaptiveActiveLiftingControlSystemShiQinpeng,WangLiang,JiaJiangtao,ZhangNan(NorthChinaPowerEngineeringCo.,Ltd.ofChinaPowerEngineeringConsultingGroup,Bejing100120,China)Abstract:Inordertoimprovethegrid-connectedadaptabilityofLCL-typeinvertersunderdifferentgridshort-circuitratios,theinstabilitymechanismofLCL-typeinvertersystemsunderlowgridshort-circuitratioswasfirstrevealedthroughimpedanceanalysis.Avirtualimpedancecontrolstrategybasedongrid-connectedcurrentfeedbackwasproposed,whicheffectivelyimprovedtheimpedancestabilitymarginoftheLCLinverteroutputimpedanceinthefaceofdifferentgridshort-circuitratios.Theproposedcontrolstrategyonlyneededtointroduceahigh-passfilterintheimplementationmethod,andhadthecharacteristicsofsimpleimplementationandstronganti-noiseability.Finally,basedonthebuilt5kWsingle-phaseLCLgrid-connectedinverterprototype,thecorrectnessandeffectivenessoftheproposedcontrolsystemforimprovingthegrid-connectedadaptabilityoftheLCLinverterwerefullyverified.Keywords:grid-connectionadaptability;grid-connectedinverter;virtualimpedance;gridshortcircuitratio;stabilityanalysis;phasecompensation;co...
