基于SVPWM的三相电压型PWM整流器的仿真设

本科毕业设计题目：基于SVPWM的三相电压型PWM整器的仿真设计学院:信息科学与工程学院专业:自动化学号:201104134174学生姓名:蔡鹏飞指导教师:王斌日期:二〇一五年六月武汉科技大学本科毕业设计I摘要电力电子器件目前已广泛应用于人们日常生活和工业生产中，而常规整流环节通常广泛采用二极管整流电路和晶闸管相控整流电路，这些不可控和相控整流会对电网注入了大量谐波，污染电网，消耗无功功率，降低功率因数。而三相电压型PWM整流器因其在保持输出电压恒定、提高系统功率因数、大幅降低谐波污染、能量绿色利用等方面具有明显优势，在有源滤波、无功功率补偿以及交直流传动系统等领域得到了越来越广阔的应用。本文详细阐述了PWM整流器的工作原理，结合理论分析了主电路功率器件的选取，并建立了基于三相和两相静止坐标系以及两相旋转坐标系的低频数学模型。选定本文主要研究对象为电压型三相桥式PWM整流器(三相VSR)。电压空间矢量脉宽调制(SVPWM)方式具有电压利用率高，电流谐波少等优点，因此对其基本原理和实现方法进行了详尽的讲解，并选择了其中谐波含量相对小的对称矢量排序策略。为实现对网侧电流的独立控制，需对电流进行解耦控制。通过综合分析与对比，选择dq坐标系下的双环反馈直接电流控制策略，极大的改善了系统的动态性能和稳定性，最后基于Simulink建立了的控制系统的仿真模型，验证了控制方案的可行性。在三相电压型PWM整流器系统的Simulink仿真研究中，整个系统主要包括以下模块：主电路模块、SVPWM控制模块以及PI模块，通过对PI参数的不断调整校正，使整流器实现了较好的整流效果。关键字：PWM整流；SVPWM调制；双环反馈；直接电流控制；仿真研究武汉科技大学本科毕业设计IIAbstractPowerelectronicdevicesarenowwidelyusedinPeople'sDailylifeandindustrialproduction,whiletheconventionalrectifiersectionusuallywidelyconsistsofdiode-rectifiercircuitandphase-controlthyristorrectifier,whichinjectslargeamountsofharmonicsintothepowernetworksandproducesmuchcontamination.Itwouldreactivepowerconsumptionandlowerpowerfactor.Thethree-phasevoltage-sourcePWMrectifier(VSR)havethecharacteristicsofconstantdirectvoltage,greenpower,powerflowhighpowerfactor,smallharmonicpollution,sotheyhavemoreandmoreapplicationperspectiveinactivefiltering,reactive-loadcompensationandmotorcontrolsystems.TheprincipleofPWMrectifierwasintroducedindetails,analyzingtheselectionofpowerdevicesofmaincircuitcombinedwiththeoreticalandconstructingthelow-frequencymathematicalmodelbasedonthethree-phasestaticcoordinatesystemandthetwo-phasesynchronousrotatingcoordinatesystemfromthepointofthetopologyofthemaincircuit.Weselectthethree-phasebridgevoltagetypePWMrectifierasthismajorstudy.Withthevoltagespacevectorspulsewidthmodulation,wecangethigherusageofthevoltage,atthesametimeitcaneffectivelyreducethecurrentharmonics.Inthispaper,theprincipleofthree-phasevoltagespacevectorandthespecificimplementationwereanalyzedindetails,choosingthesymmetricvectorsequencingstrategywithrelativelysmallharmoniccontent.Inordertorealizetheindependentcontrolofthenetsidecurrent,Wehavetogetthecurrentdecoupled.Thebicyclicdirectlycurrentcontrolschemeindqrotationisselected,itmakesthesystemmorestableandfasterresponse，andthroughtheclosedloopsystemsimulationbasedonsimulinktoverifythefeasibilityofthiscurrentcontrolscheme.Intheresearchofthesystemofthethree-phasevoltage-sourcePWMrectifierbasedonsimulink,establishthemaincircuitmodel,SVPWMsimulatemoduleandsimulatemodelofPIcontrolconditioner.Therectifierwillachievegoodrectifying武汉科技大学本科毕业设计IIIeffectbyadjustingPIparameterscalibrationconstantly.Keywords：PWMrectifier；SVPWMmodulation；Doubleloopfeedback；Directcurrentcontrol；Simulateresearch武汉科技大学本科毕业设计IV目录1绪论........................................................................................................................................11.1课题的研究背景与意义...................................................................................................11.1.1谐波的危害和抑制...............................................................................................21.1.2PWM整流器国内外研究现状................................................................................21.2电压型PWM整流器的控制技术.......................................................................................31.3本文的主要研究内容和重点...........................................................................................42三相PWM整流器原理、控制策略与调制技术....................................................................62.1PWM整流器的基本原理....................................................................................................62.2PWM整流器的拓扑结构....................................................................................................82.2.1单相全桥PWM整流器拓扑结构...........................................................................82.2.2三相半桥PWM整流器拓扑结构...........................................................................92.3三相电压型PWM整流器的低频数学模型.....................................................................112.3.1ABC静止坐标系下的低频数学模型..................................................................112.3.2两相旋转坐标系下的低频数学模型.................................................................132.4三相电压型PWM整流器的电流控制策略.....................................................................152.4.1间接电流控制.....................................................................................................152.4.2直接电流控制.....................................................................................................162.5SVPWM调制技术基本原理..............................................................................................172.6本章小结.........................................................................................................................193三相电压型PWM整流器的建模和仿真..............................................................................213.1SVPWM算法实现..............................................................................................................213.2主电路参数设计...................................................