太阳能光伏发电单相并网逆变器研究

学位论文太阳能光伏发电单相并网逆变器研究李本元申请学位级别:指导教师姓名:硕士学位张开如专业名称:职称:电力电子与电力传动山东科技大学二零一零年五月论文题目:太阳能光伏发电单相并网逆变器研究作者性名:专业名称:指导教师:李本元入学时间:之塑主生旦动研究方向张开如玺业边虹遨鱼塑遇:草.一奎壑论文提交日期:论文答辩日期:授予学位日期:_._.乌越旦笙立且一2010.年石且1互旦STUDYOFSINGLE一PHASEGRIDINVERTEROFSOLARPHOTOVOLTAICPO丫VERGENERATIONADissertationsubmittedinfulfillmentoftherequirementsofthedegreeofMASTEROFPHILOSOPHYfromShandongUniversityofScieneeandTeehnologyLiBenyuanSuPervisor:ProfessorZhangKairuCollegeofInformation&ElectriealEngineeringMay2010弋8,rt卜尸明本人呈交给山东科技大学的这篇硕士学位论文,认的文献外,全部是本人在导师指导下的研究成果它任何学术机关作鉴定除了所列参考文献和世所公该论文资料尚没有呈交于其硕士终/杏衣屯期-叼许明朔AFFIRMATION1declarcthatthistheawardofMaslTeehnology,15Whodoeumenthasnotinstitute.disser招tion,sub而ttedinfulfillmentoftherequirementsfor,rofPhilosoPhyinShandongUniversityofSeieneeandlynlyownWorkunlessrefe代ncedofae玩owledge.Thebeensub而ttedforqualiflcationatanyotheracade而e/gn一-物卿Date:山东科技大学硕士学位论文摘要摘要在太阳能开发和利用过程中,光伏发电并网系统以其运行成本低和供电稳定性,越来越受到人们的重视本文以太阳能光伏发电单相并网逆变器为对象,研究太阳能光伏发电与电网连接的相关技术问题首先,在建立光伏电池仿真模型的基础上,本文分析了最大功率点跟踪原理,详细介绍了两种最常用的扰动观察法和电导增量法,在两种方法的基础上提出了本文所采用的改进型扰动观察法,利用Matlab仿真验证了光伏阵列最大功率点跟踪其次,分析逆变电路的原理和结构,利用推挽式DC/DC变换电路和全桥式DC/AC逆变电路构建系统主电路,改进电流跟踪方式,利用PI调节和电压前馈控制,使并网电流同步跟踪电网电压,并建立系统Matlab仿真模型,仿真结果验证了控制策略的正确再者,孤岛效应涉及到电网和光伏发电系统的安全运行根据本文系统的特点,在分析各种常用的主动式和被动式孤岛检测方法的基础上,提出了过/欠电压检测和电压相位突变检测相结合的方法来检测孤岛效应,详细分析了工作原理,并进行了仿真验证最后,基于TMs320LF24o7A设计出单相并网逆变系统的主控制电路,包括最小系统!时钟电路!驱动电路!采样电路等;并详细介绍了DC/DC和DC/AC电路的控制过程,给出系统软件主程序!同步中断子程序等流程图根据并网逆变器的锁相原理构建基于TMS320LF2407A并网逆变器的数字锁相,使并网电流能实时跟踪电网电压,实现了系统硬件电路设计和控制策略关键词:最大功率点跟踪,并网,Matlab仿真,孤岛效应,锁相匆山东科技大学硕士学位论文摘要ABSTRACTWiththedeveloPmentandutilizationofsolarPower,PhotovoltaiePowergeneration幼d一connectedsystem15PaidmoreattentionwithitslowrunningcostsandPowersuPPlystability.hiviewofsingle一PhasegridinverterofsolarPhotovoltaicPowergeneration,thetechnicalissuesofsolarPhotovoltaiePowergenerationeonnectingwiththegrid15studiedinthepaper.Firstly,aeeordingtosimulationmodelofsolareells,thePrineiPleofthemaximumPowerPointtracking15analysised.Twomosteommonlyusedmethodinerementalconductaneeanddisturbanceobservation15describedandtheimProveddisturbaneeobservationbasedonthetwomethods15Putforward.TheMatlabsimulationresultsverifythemaximumPowerPointtraeking.Seeondly,thePrinciPlesandstrUctureoftheinvertercircuit15analysisedandthemaineircuit15builtonthebasisofPush一PullDC/DCeonverterandfullbridgeDC/ACinverterinthePaPer.Thegrid一connectedeurrentcantraekthegridvoltagesynchronouslyuPontheeurrenttrackingmethodsandthestrategyofPlregulationandvoltagefeedforwardeontrol.TheMatlabsimuationmodel15setuPandthesimulationresultsverifytheeontr01strategyThiully,islandinginfluencesthesecuntyofPowergridandthePVgrid一eonneetedsystem.Thev硕ouseommonlyusedactiveandPassiveislandingdetectionmethod15analysisedinthePaper.Accordingtothecharacteristiesofthissystem15ProPosed,theover/undervoltagedeteetionandvoltagePhasemutationdeteetionmethod15usedtodeteetislanding.Thismothod15analysisedandsimulation15verified.Finally,themaineontroleircuitofsingle一Phasegrideormectedinvertersystem15designeduPonTMS320LF2407A.Theeontroleircuitineludestheminimumsystem,clockeircuit,drivereircuitandSamPlingeircult.TheDC/DCandDC/ACeircuiteontr01Proeess15introducedandthesoftineludesthemainsoftwareProgramands邓而onousinteri刀Ptsubroutineflowchartand50on.AccordingtothePrinciPleofPhase一lockedofgrid一cormeetedsystem,thedigitalPLL15bulltuPonTMS320LF2407Aandthegrid一connectedcunentcanreal一timetrackthegridvoltage.Thesystemhardwareeircuitandcontrolstrategy15realized.Keywords:MPP工grid一eon-neeted,Matlabsimulation,islanding,PLL了一山东科技大学硕士学位论文目录目录1绪论............................................................................................................,,11.1太阳能光伏发电的背景与意义............................................................................,,11.2太阳能光伏发电的优点........................................................................................,,11.3国内外光伏发电现状...................................................................................#########,,21.4光伏发电系统组成...........................,,,..................############################################,,31.5光伏发电系统分类.................................................,,,..######################################,,41.6本文主要研究内容..................................................#####..#######################################,,5光伏发电和最大功率点跟踪....................................................................,,72.1光伏发电原理........................................................................................................,,72.2光伏电池等效电路................................................................................................,,82.3光伏电池基本特性................................................................................................,,92.4光伏电池仿真......................................................................................................,,112.5最大功率点跟踪(MPPT)...............................................................................,,巧2.6最大功率点跟踪(MPPT)仿真.......................................................................,,20并网逆变器设计.......................................