44光伏并网逆变器控制策略与仿真研究

-编号：毕业设计(论文)说明书题目：光伏并网逆变器控制策略与仿真研究院（系）：机电工程学院专业：电气工程及其自动化学生姓名：学号：0700120214指导教师单位：机电工程学院姓名：职称：副教授题目类型：理论研究实验研究工程设计工程技术研究软件开发2011年05月30日摘要光伏并网发电能有效的利用清洁的太阳能资源，并将其高效馈网。到2007年年底，全国光伏系统的累计装机容量达到100MW，并已初步建立起从原材料生产到光伏系统建设等多个环节组成的完整产业链，呈现出一片繁荣景象。本设计针对光伏并网过程中的直流升压、SPWM波形产生、同步锁相、逆变并网动态过程、研究了基于电网特点的FIR数字滤波、交流采样和稳定直流母线电压的数字PID控制器等技术提出了相应的控制策略并进行Simulink动态仿真，研究工作对光伏并网逆变系统实验与设计理论上具有一定指导作用。同时采用基于模型嵌入式的设计理念，通过使用Matlab提供的EmbeddedTargetforTIC2000以及DSPTexasInstrumentsExpressTMDSP工具建立Simulink模型。进一步利用CCSLink调用第三方编译软件CCS，通过实时工作站（real-timeworkshop）和TI开发工具将Simulink模型转换为实时C代码，EmbeddedTargetforTIC2000DSP提供了Matlab和Simulink与TexasInstrumentsExpressTMDSP工具、TIC2000DSP集成在一起进行系统开发的手段。通过实时工作站（real-timeworkshop）和TI的开发工具将Simulink模型转换变成为实时C代码。这种基于模型的嵌入式设计技术，能够自动产生高效的程序代码。相比传统的设计方法：不需要设计者熟练掌握DSP内部复杂的寄存器的位设置，免除手写程序代码及验证的繁琐；有助于工程师进行系统级设计，并解决设计中存在的问题，可显著地简化并缩短基于C2000处理器的系统设计过程，使工程师可以更专注于优化控制算法的开发。本文最终给出了低压的模拟样机，具有结构简单、价格低廉等优点。能方便的对所研究和制定的控制策略进行验证。实验表明采用代码自动生成技术极大地加快了单相桥式逆变器系统的开发进程。运行测试证实：自动生成代码的可靠性和效率完全可以得到保证。这充分地展现了一体化系统设计方法在电力电子装置中应用的光明前景。关键词：光伏逆变；Simulink代码生成；FIR数字滤波；PID控制器；SPWMAbstractPhotovoltaicpowergenerationcaneffectivelyusingcleansolarenergyresourcesanditsfeednetwork.Bytheendof2007,thetotalinstalledcapacityofPVsystemshadreach100MW,andestablishedacompleteindustrialchainthatincludeProductionofrawmaterialstoconstructionofPVsystems,whichpresentsflourishing.ThedynamicsprocessofDCboost,SPWMgenerator,SPLL,inverterandgrid,baseonthecharacteristicsofgridtodesignFIRdigitalfilter,ACsamplingandDCbusvoltagestabilityofdigitalPIDcontrolEtchasbeendesignedinthisresearch.AndcorrespondingcontrolstrategyandtheSimulinkdynamicsimulationarepresentedalso,researchonphotovoltaicinvertersystem,havebeenusedtoguideforexperimentandtheorydesign.AtthesametimeaSimulinkmodelcanbecreatedusingmodel-basedembeddedtechnology,withtheMatlabEmbeddedTargetforTIC2000andDSPTexasInstrumentsExpressTMDSPtool.FurtherCCScouldbecalledbyCCS-Link,usingreal-timeworkshopandtheTIdevelopmenttools,real-timeCcodewillbeturnedintoSimulinkmodel,EmbeddedTargetforTIC2000DSPprovideawayforMatlabandSimulinkwithTexasInstrumentsExpressTMDSPTools,TIC2000DSPintegratedsystemsdevelopment.realtimeworkshopandtheTIdevelopmenttoolswillbeconvertedSimulinkmodelintoreal-timeCcode.Efficientcodecanbegeneratedautomaticallybyusingmodel-basedembeddeddesigntechnology.Comparedtotraditionaldesignmethods:DesignersdonotneedtoproficiencyincomplexityoftheregisterwithintheDSPbitsettings,theprocessofhand-writtencodeandverifyingisreduced;whichhelpengineersforsystem-leveldesignandsolvingdesignproblems,significantlysimplifyandshortentheC2000processor-basedsystemdesignprocess,whichallowsengineerstoconcentrateonthedevelopmentofoptimalcontrolalgorithms.Thelow-voltageprototypewithsimplestructure,lowcostcharacteristichadbeengiveninthepaperfinally.Itcanbedevelopedtostudyandverifycontrolstrategyeasily.Automaticcodegenerationtechnologyhasgreatlyacceleratedthesingle-phasebridgeinvertersystemdevelopmentprocesswasprovidedinthispaper.Andauto-generatedcode,reliabilityandefficiencycanbeguaranteedbyconfirmingwiththetests.Itfullydemonstratedtheintegratedsystemmethodbrightfutureintheapplicationofpowerelectronic.KeyWords:PVinverter;Simulinkcodegeneration;FIRdigitalfilter;PIDcontroller;SPWM目录引言........................................................................................................................................................................11绪论................................................................................................................................................................21.1逆变并网器分类与发展.................................................................................................................................21.2逆变并网器作用............................................................................................................................................31.3逆变并网器结构特点.....................................................................................................................................31.4本设计结构特点............................................................................................................................................41.5本课题主要任务............................................................................................................................................42逆变并网器各部分设计................................................................................................................................52.1DC-DC变换器..............................................................................................................................................52.1.1隔离型DC-DC变换器.................................................................................................................................52.1.2不隔离型DC-DC变换器.............................................................................................................................52.2直流母线电压PID控制器设计................................................................................................................