文档名：一种低输入电流总谐波畸变率的三相Buck整流器不对称调制策略
摘要：传统空间矢量脉宽调制(SVPWM)三相Buck整流器没有考虑直流链电流纹波对输入电流的影响,且在扇区切换点处输入电流存在严重畸变,导致输入电流总谐波畸变率(THD)升高.该文分析直流链电流纹波对三相Buck整流器输入电流的影响,分析输入电流扇区切换点畸变产生的原因,提出一种新型不对称SVPWM策略,显著降低了三相Buck整流器的输入电流THD.最后,通过仿真和1kW的实验样机验证了理论分析的正确性以及所提调制策略的有效性.
Abstract：Theinputcurrenttotalharmonicdistortion(THD)isanimportantperformanceindicatorofathree-phaseBuckrectifier,closelyrelatedtothemodulationstrategy.Whencalculatingthedwelltimeofthevectorinthepreviousresearchonspacevectorpulse-widthmodulation(SVPWM),therippleoftheDC-linkcurrentwasignored,i.e.,itwasconsideredaconstantvalue.However,inpracticalapplications,toimprovedynamicperformanceandpowerdensity,theoutputinductorofthethree-phaseBuckrectifiertakesasmallvalue,whichleadstoalargeDC-linkcurrentripple.Inthiscase,theimpactoftheDC-linkcurrentrippleontheinputcurrentbecomesobvious.Secondly,theinputcurrentofthethree-phaseBuckrectifierwiththeconventionalSVPWMmodulationstrategieshasseveredistortionduringthesectortransition.Therefore,thispaperproposesalowinputcurrentTHDmodulationstrategy,whichconsiderstheinfluenceofDC-linkcurrentrippleontheinputcurrentqualityandeliminatestheinputcurrentdistortionduringthesectortransition.Therefore,theinputcurrentTHDiseffectivelyreduced.TheimpactoftheDC-linkcurrentrippleontheinputcurrentisanalyzedinthispaper.Firstly,basedontheoperatingstatesofthethree-phaseBuckrectifierinsector1,therelationshipbetweentheinputcurrentofthethree-phasebridgearmandtheDC-linkcurrentisobtained.Secondly,therelationshipbetweentheinputaverageequivalentcurrentamplitudeofthethree-phasebridgelegsisanalyzedfordifferentmodulationstrategies.Then,theamplituderelationbetweentheinputvoltageandthecorrespondinginputcurrentisobtained.WhentherippleoftheDC-linkcurrentislarge,theresultsshowthattheratioofthethree-phaseinputcurrenttothecorrespondinginputvoltageisnotequaltotheconventionalasymmetricmodulation,whichleadstoahighharmoniccontentintheinputcurrent.Fortheconventionalsymmetricmodulation,theratioofthethree-phaseinputcurrenttothecorrespondinginputvoltageisequal,whichmeansthattheharmoniccontentoftheinputcurrentislowerthantheconventionalasymmetricmodulation.Inaddition,thepaperalsoanalyzesthereasonfortheinputcurrentdistortionduringthesectortransitionoftheconventionalSVPWMmodulationstrategies.Therelationbetweenthethree-phaseinputcurrentanddc-linkinductorcurrentisgiven,theinputinductorcurrentofeachvectorisdeduced,andthetransitionprocessofdrivesignalswithdifferentmodulationstrategiesduringthesectortransitionisgiven.TheanalysisshowsthattheinputcurrentoftheconventionalSVPWMmodulationstrategieshasdistortionduringthesectortransition.AlowinputcurrentTHDmodulationstrategyisproposed.Inthismodulationscheme,theinfluenceoftheoutputinductorcurrentrippleontheinputcurrentisconsidered,andtheinputcurrentdistortionduringthesectortransitioniseliminated.Thesimulationresultsshowthatamongthethreemodulations,theinputcurrentTHDoftheconventionalasymmetricmodulationisthehighest(4.9%),andtheinputcurrentTHDoftheconventionalsymmetricmodulationislower(2.3%)thanthatoftheconventionalasymmetricmodulation.TheinputcurrentTHDoftheproposedlowinputcurrentTHDmodulationstrategyisonly1.7%athalfloadand1.2%atfullload,respectively,whichisthelowestamongthethreemodulationstrategies.
作者：曹海彬 许建平 谢飞 周琛力 陈欣Author：CaoHaibin XuJianping XieFei ZhouChenli ChenXin
作者单位：西南交通大学电气工程学院磁浮技术与磁浮列车教育部重点实验室成都610031
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(8)
分类号：TM461
关键词：三相Buck整流器 直流链电流纹波 输入电流畸变 不对称调制策略
Keywords：ThreephaseBuckrectifier rippleoftheDC-linkcurrent inputcurrentdistortion asymmetricmodulationstrategy
机标分类号：TM464TM7TM301.2
在线出版日期：2024年4月29日
基金项目：国家自然科学基金一种低输入电流总谐波畸变率的三相Buck整流器不对称调制策略[
期刊论文] 电工技术学报--2024, 39(8)曹海彬 许建平 谢飞 周琛力 陈欣传统空间矢量脉宽调制(SVPWM)三相Buck整流器没有考虑直流链电流纹波对输入电流的影响,且在扇区切换点处输入电流存在严重畸变,导致输入电流总谐波畸变率(THD)升高.该文分析直流链电流纹波对三相Buck整流器输入电流的...参考文献和引证文献
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一种低输入电流总谐波畸变率的三相Buck整流器不对称调制策略 An Asymmetric Modulation Strategy for Three-Phase Buck Rectifier with Low Input Current Total Harmonic Distortion
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