文档名：适用于大型海上风电的谐振型飞跨电容式模块化升压变换器
摘要：随着海上风电发电容量的增大与离岸距离的增加,全直流型海上风电系统的优势越发明显.高压DC-DC变换器是该系统的核心部件,承担直流升压与输电的关键功能.对此,该文提出一种适用于大型海上风电的谐振型飞跨电容式模块化升压变换器,不受大功率中频高压变压器制造工艺的限制,无变压器结构使其能工作在更高频率,减少内部无源器件,实现轻量化.在高升压比应用场景中,变换器内部大部分功率器件为二极管,可节省控制单元,并降低成本.与电流连续模式相比,当内部二极管半桥工作在电流断续模式时,该变换器能在仅增加少量通态损耗的前提下实现内部功率器件的软开关.此外,该变换器采用准方波调制时,电流断续模式能避免内部串联二极管承受高dv/dt.最后,通过样机实验验证了该变换器拓扑的可行性与参数设计方法的正确性.
Abstract：Withtheincreasingsaturationofoffshorewindfarmsites,thetrendinoffshorewindpowerisshiftingtowardsdeep-waterdevelopment.Theabsenceofreactivepowerlossandsub-synchronousoscillationproblemsmakesitmoresuitableforlarge-capacity,long-distance,deep-wateroffshorewindfarms.Thehigh-voltageDC/DCconverteristhecorecomponentofall-DCoffshorewindpower,connectingthecollectorgridandthetransmissionline.Aresonantflyingcapacitormodularboostconverterisproposedforlarge-scaleoffshorewindpowerapplications.Firstly,thetransformertopologyisintroduced,andtheoperatingmodeanalysisiscarriedout.ThisconvertertypicallyusesamultiphasestructuretoincreasethetransmissionpowerandcancelouttheACcomponentofthecurrentattheDCinputandoutputduringsymmetricaloperation.Eachphaseconsistsoftwosub-modulehalf-bridges,diodehalf-bridges,andflyingcapacitors.Thesub-modulehalf-bridgeconnectedtotheDCinputisnamedthemaster-bridge,andtheotherisnamedtheslave-bridge.Themaster-bridgeandslave-bridgeadoptquasi-square-wavemodulationtoreducethesub-modulecapacitanceandfacilitatesoft-switching.Themodulationphasedifferencebetweenmaster-bridgeandslave-bridgeisadjustedtochangetheoutputpower.Accordingtotherelationshipbetweenmaster-bridgearminductanceLmandslave-bridgearminductanceLs,theconverteroperatesintwoconditions.Thediodehalf-bridgecanoperateincontinuousordiscontinuouscurrentmodebasedonparameterdesigns.Then,accordingtothephaserelationshipofsteady-statevoltageandcurrentintheconverter'sinternalACequivalentcircuitdiagramandtheoperatingmodeanalysis,thetwodesignmethodsarepresented,onewhereLsismuchlargerthanLm,andtheotherwhereLmismuchlargerthanLs.WhenLsismuchlargerthanLm,thecontinuouscurrentmodemakestheDCsidevoltagesoftheslave-bridgeanddiodehalf-bridgesclosetothatofthemaster-bridge,moreconvenientfordeviceselection.WhenLmismuchlargerthanLs,thediscontinuouscurrentmodemakestheDCsidevoltagesoftheslave-bridgeanddiodehalf-bridgesclosetothatofthemaster-bridge.Theidealvoltageandcurrentwaveformsforbothoperatingconditionsarequantitativelyanalyzed,andthearmcurrentRMSandmaximumvaluesofeachhalf-bridgeareobtained.Inthecontinuouscurrentmode,LsismuchlargerthanLm.Inthediscontinuouscurrentmode,LmismuchlargerthanLs,andthearmcurrentRMSandmaximumvaluesoftheslave-bridgeincreasegreatly.Sincethearmcurrentofthemaster-bridgeandthenumberofdiodehalf-bridgesarethelargest,theon-statelossincreaseintheslave-bridgehasasmalleffectontheoverallon-statelossoftheconverter.Inthisdiscontinuousmode,thepowerdevicesofthemaster-bridgeandslave-bridgearemoreconducivetosoft-switching,andtheseriesdiodesinsidethediodehalf-bridgedonottoleratehighdv/dt.Consideringthathigh-frequencyoperationcanmaketheconverterlightweightandreduceswitchingloss,inthediscontinuouscurrentmode,thedesignmethodthatLmismuchlargerthanLsisadopted.Theparameterdesignmethodsofthemaster-bridge,slave-bridge,diodehalf-bridge,andflyingcapacitoraregiven.Finally,theconvertertopologyandtheparameterdesignmethodareverifiedbylow-powerprototypeexperiments.AresonantflyingcapacitormodularBoostconverteroperatesatahigherfrequencywithoutatransformerstructure,reducinginternalpassivecomponentsandachievinglightweight.Inhighstep-upratioapplications,mostpowerdevicesinsidetheconverterarediodes,reducingcontrolunitsandcosts.Comparedtothecontinuouscurrentmode,thediscontinuouscurrentmodeallowsforsoft-switchingwithminimalincreaseinon-statelosses,andthequasi-squarewavemodulationmitigateshighdv/dtissuesoftheinternalseriesdiodes.
作者：潘俊良 王明渝Author：PanJunliang WangMingyu
作者单位：重庆大学电气工程学院重庆400044
刊名：电工技术学报 ISTICEIPKU
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(12)
分类号：TM46
关键词：海上风电 高压直流输电 DC-DC变换器 模块化 飞跨电容
Keywords：Offshorewindpower HVDCtransmission DC-DCconverter modular flyingcapacitor
机标分类号：TM46TM311TN386
在线出版日期：2024年7月19日
基金项目：适用于大型海上风电的谐振型飞跨电容式模块化升压变换器[
期刊论文] 电工技术学报--2024, 39(12)潘俊良 王明渝随着海上风电发电容量的增大与离岸距离的增加,全直流型海上风电系统的优势越发明显.高压DC-DC变换器是该系统的核心部件,承担直流升压与输电的关键功能.对此,该文提出一种适用于大型海上风电的谐振型飞跨电容式模块化升...参考文献和引证文献
参考文献
引证文献
本文读者也读过
相似文献
相关博文
适用于大型海上风电的谐振型飞跨电容式模块化升压变换器 Resonant Flying Capacitor Modular Boost Converter for Large Scale Offshore Wind Power
适用于大型海上风电的谐振型飞跨电容式模块化升压变换器.pdf
- 文件大小:
- 4.01 MB
- 下载次数:
- 60
-
高速下载
|
|
