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1、AbstractTogetherwiththerapiddevelopmentofsmartgridandthehigherrequirementofpowerquality,thetraditionalpowertransformercannotwellmeettherequirementofsmartgridbecauseofitsscantycontrolmeansandunreliablepowerquality.Insuchabackground,ElectronicPowerTransformer(EPT)asanewsmartpowertransfor
2、mercomesout.BythemeansofPowerelectronictechnology,EPTcanmaketheactivepower,reactivepowerandfrequencyoftheprimaryandsecondarysidecompletelydecouple,soitpossessesmanyspecialadvantagessuperiortothetraditionalones.Itcanlargelyimprovepowerqualityandsystemstability,thereforeitsstudybecomesmo
3、reandmoreimportant.ConsideringthehighvoltageofEPT'soutputinverterlink,thispaperproposesaEPTtopologycombiningcascadedmultilevelinvertersandCPS-SPWMmodulationmethodwhichcanobtainhigherequivalentswitchingfrequencythereforereducestheoutputfilteringeAstothecontrollingstrategiesofEPT,thispap
4、erconsidersthedesignofinvertercontrollinginactiveandpassiveloadtwosituations,andproposesastatefeedbackdecoupledcontrollingbasedonthePARKtransformation.FurtheTmoie,theinvertersimulationmodelwasestablishedunderMatlab/Simulinkenvironment,andtheresultsreviewsthestatefeedbackdecoupledcontr
5、ollingmakethesystemgetaquickdynamicandnon-steadyerrorafterstability.Besides,anEPTprototypeincludingcascadedseven-levelinvertersissetup,whichusesDSPasitscontrolsystemtosamplesignal,calculatecontrolandsoon.Andtheexperimentalresultsreviewthateachinputandoutputelectricparameterscanbecontro
6、lledperfectlyandprecisely,whichmakeEPThasahighresearchvalueinindustiyapplication.Keywords:ElectronicPowerTransformer,UnipolarDual-FrequencyCarrierPhase-shiftedSPWM,CascadedMultilevelInverter,StateFeedbackDecoupledControl摘要IAbstractII1绪论1.1引言(1)1.2电子电力变压器的国内外研究现状(2)1.3多电平技术的发展概况(3)1.4本文
7、的主要工作(6)2级联多电平逆变器的调制技术2.1级联多电平逆变器的PWM控制方法分类(7)2.2载波移相SPWM(CPS-PWM)理论(9)2.3本章小结(18)3基于级联多电平逆变器的电子电力变压器3.1电子电力变压器的基本原理(19)3.2基于级联多电平逆变器的电子电力变压器(19)3.3级联多电平逆变器的数学建模(20)3.4木章小结(27)4电子电力变压器控制系统设计与仿真4.1电子电力变压器控制策略概述(28)4.2无源型级联多电平电子电力变压器控制系统设计(29)4.3有源型级联多电平电子电力变压器控制系统设计(36)4.4仿真验证(41)4.5本
