摘要:
针对H桥级联变换器存在功率器件数量多、控制复杂等问题,提出一种三相线电压级联 整流器拓扑;分析了此拓扑的工作原理、电路等效模型及交流侧电流正弦化工作的开关管调制约 束条件;通过解析拓扑交流侧相桥臂电压的谐波成分,设计了基于单周期控制的移相载波PWM 调制策略及功率因数校正控制器;推导了拓扑直流侧电容电压的控制传递函数。 理论分析及实 验验证表明,此拓扑及其控制策略使开关管承受耐压有效降低,提高了交流侧功率因数,可作为 新一代中高压变换器整流级。
Abstract:
Inthispaper,anovelthree-phaserectifierbased on triple line-voltage cascaded VIENNA converter(LVC-VC) has been proposed,which could be the high power factor rectifier under high powervoltage.Comparedtoconventionalthree-phasecascadedH-bridgeconverters,intheproposednew multilevelconverters,andfewerswitchesanddccapacitorsarerequiredundersimilaroperatingconditions.Basedonthestudytotheoperationprincipleofthenewconverter,thepowerfactorcorrectionof theproposedconverterisrealizedbyemployingtraditionalone-cyclecontrolstrategy,thecarrierphaseshiftingmodulationisdesignedtoreducetheacvoltageharmonic.Thedcsidecapacitorvoltagesteady statemathematicalmodelisdeduced,thescopeofthedcsidecapacitorvoltageiscalculated,thecontrollersofdc-linkvoltagesofthethreeViennarectifiermodulesaredesigned.Simulationandexperimentalresultsverifiedtheavailabilityofthenewproposedmultilevelconverterandthevalidityofthecorrespondingcontrolstrategyapplied.
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