级联多电平变频器测控系统的设计

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1、西南交通大学硕士学位论文级联多电平变频器测控系统的设计姓名：程新伟申请学位级别：硕士专业：电力电子与电力传动指导教师：关振宏20090501西南交通大学硕士研究生学位论文第1I页-●_--_l●●-____Il●_l__l-___l-●l_-__●-_-_-●l_______●_●_______--__●__-__●____--。。-_____________●__-___●_●-l●--l--I_____●_-l-_一一AbstractInmulti-levelinverters，thevoltag

2、estressofeachpowerdeviceisrelativelylower，thatissuitabletorealizethehi曲voltageandlargecapacityinverterswiththelowvoltageresistantpowerdevices．Anditispossibletoenhancethequalityofinverter’Soutputvoltageobviouslybyusingmulti—levelinverters．Therefore，witht

3、hedevelopmentofpowerdevices，themulti-levelconvenertechnologyhasbeenalleffectiveapproachforinverterstoachievehi曲voltageandlargepower．Inthispaper,selectedoneofthestrongcompetitiveadvantagetopology--cascadedmulti—levelinvertersastheresearchobject．Completed

4、itstopology,controlstrategyandthemeasureandcontrolsystemdesign．Firstofall，thispaperanalysedtheresearchsignification，domesticandforeignresearchstatusofmulti·levelinverters．Comparedthecharacteristicsofthreematuretypesoftopology,acquiredtheadvantageofcasca

5、dedmulti—levelinvertersand,consequently，takeditastheresearchobject．Comparativeanalysisofthefourmodulationstrategy，chosedcarrierPhase—ShiftedSPWM(PSSPWM)’SmodulationmethodandConstantProportionofVoltagetoFrequency’Scontrolstrategy．Throughmathematicalanaly

6、sisandtheoreticalsimulation，wecanconfirmthatOurchoiceiscorrectandfeasible．Pointedouttherelationofcaseadeunits’numberandcarrierphase·shiftedangle，andthemodulationratio(M)’Simpactontheoutputvoltage．Completethemathematicalmodelofcascadeinverterandthedead—t

7、imeeffection．Inthenextpart，accomplishedthehardware’Sdesign，includethetypeselectionofDigitalSignalProcessor(DSP)，ComplexProgramableLogicDevice(CPLD)，andIntelligentPowerModule(IPM)；Thecircuits’designofsystempower,measurement(speed，current，voltage，fault)ci

8、rcuitsandcommunication．UsingLabwindows／CVItoachieveauppercomputerinterface，therealizationoftheinverter’Sturnandoff,setthespeed，communicationconfigured，voltage，currentandspeedmeasured，currentsoftwarefiltering，harmonicanalysis．Comp