不平衡电网下基于虚拟振荡器控制的并网逆变器控制策略

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中图分类号：TN752-34 文献标识码：A 文章编号：1004-373X（2025）18-0083-08

引用格式：，，，等.不平衡电网下基于虚拟振荡器控制的并网逆变器控制策略[J].现代电子技术，2025，48（18）：83-90.

Abstract：In allusion to the three-phase unbalance of output current and second-harmonic fluctuationof output power when thegrid-conectedinverterisconnectedtotheunbalancedgridbasedonthetraditionalvirtualoscilltorcontrol（VOC），an improvedVOC strategyisproposed.Thepositiveandnegativesequenceseparation technologyforvoltageandcurrentis introducedonthebasisof traditionalVOC.Acurentlopinputcommandcalculationlinkisadded，thecurrentloopisdesiged by means of positiveand negativesequencecombinationmethod，and the pre-synchronization moduleofVOCisdesigned.The VOC-basedsimulationmodelforthegrid-connectedinvertersystem isestablishedontheMatlab/Simulink simulationplatform. Theresearchresults indicate thatunderanunbalanced powergrid，theoutputcurentusing the proposedcontrolstrategyisthreephasebalanced，withaharmonicdistortionrateof1.66%.Thefluctuationamplitudesofactiveandreactivepowerarereducedby 47.4% and 35% ，respectively. Therefore，the proposed method can ensure balanced three-phase output current with good waveform quality，and also suppress the second-harmonic fluctuation of power to a certain extent.

Keywords：virtualoscillatorcontrol;grid-connectedinverter;unbalancedgrid;positiveandnegativesequenceseparation; pre-synchronization; control strategy

0 引言

“双碳”战略目标的提出是实现可持续发展的重要收稿日期：2024-08-15 修回日期：2024-10-18基金项目：国家自然科学基金项目（52307109）

途径之一。（剩余8643字）