双向高频环节逆变器研究

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1、摘要双向高频环节逆交器具有双向功率流、高频电气隔离、拓扑简洁、功率变换级数少等优点，特别适用于要求双向功率流的逆变场合．本文深入研究了一种新型的双向高频环节逆变器的电路结构、拓扑与移相控制策略，对逆变器稳态原理进行了分析。单极性移相控制策略使得周波交换器功率开关在变压器电压为零时切换，实现了ZVS开关；输出滤波器前端得到的是单极性SPWM波，输出频谱特性好，体积、重量小。仿真结果验证了理论分析的正确性。本文设计了IKVA270VDC／115V400HzAC双向高频环节逆变器试验样机，给出了试验结果。原理试验结果与理论分析及仿真结果一致，证实了双向高频环节

2、逆变器的可行性。本文分析了基于双向高频环节逆变器的UPS系统工作过程与原理。采用双向高频环节逆变器可使uPs系统主电路变得简洁。仿真结果验证了基于双向高频环节逆变器的UPS系统的可行性，及双向高频环节逆变器双向功率流的特性。本文对单极性、双极性移相控制全桥式高频环节逆变器的控制策略、原理特性和关键电路参数设计准则等进行了深入的比较研究，获得了重要研究结论。关键词：高频环节逆变器移相控制双向功率流UPS!堡主笙苎翌堕苎塑至羔望壅翌塞。AbstractBi-directionalinverterwithhigh-frequencylinkhastheadva

3、ntagessuchasbi-directionalpowerflow,highfrequencyelectricali∞latioII，simpletopology,fews坦gesofpowerconversion,anditisespeciallysuitableforoccasioninbi-directionalpowerflow．Anew-typebi-ditectionaihigh-frequencylinkinverter’Scircuitconfigurationandtopology,shiftingcontrolstrategy,a

4、nalysisofsteadyprinciplealedeeplyinvestigatedinthisthesis．Byusingsinglepolarityphaseshiftingcontrol，cycloconverterturnson／offwhenthevoltageofthetransfoFillerisZerO．thenthecycloconvertercanbeze∞voltageswitching(ZVS)．AsinglepolaritySPWMwavevoltageisgotbeforetheoutputfilterandtheout

5、putisgood．Thetheoreticalanalysisisverifiedbythesimulationresults．Theprototypefor1KVA270VDC／I15V400HzACbi-directionalhigh-frequencylinkinverterisdeveloped，andthetestresultsaregiven．Theresultofprincipletestwasconsistentwiththetheoreticalanalysisandthesimulationresult,confirmedbi—di

6、rectionalhigh-frequencylinkinverterfeasibility．TheworkprocessandtheprincipleofaUPSsystemthatisbasedonbi-directionalhigh-frequencylinkinverterhavebeenanalyzed．Usingbi-directionalhigh-frequencylinkinvertermaymakethemaincircuitoftheUPSsystemtobemoresuccinctly．Thesimulationresulthasc

7、onfirmedthefeasibilityoftheUPSsystemwhichisbasedonbi-directionaihigh-仔equencylinkinverter,andbi-directionalhigh-frequencylinkinverter’Scharacteristicsuchasbi--directionalpowerflow．ThroughdeeplycomparisonandresearchOilthecontrolstrategy,principlecharacteristic，designcriteriaforthe

8、keycircuitparametersofsinglepolarityandd