搜索
I摘要：本文首先建立了永磁同步电动机的数学模型，深入研究了永磁同步电动机的矢量控制理论，并在此基础上讨论了永磁同步电动机的控制方案。为了获得更好的控制效果，本文采用了空间电压矢量脉宽调制方式，确定了基于id=0的矢量控制方案及其电流反馈控制系统结构，并分析了电流解耦的主要影响因素。最后从滑模变结构理论出发，设计了滑模变结构与PI的组合速度环控制器，克服了常规滑模控制器(VSC)在滑模面附近的高频颤动，提高了稳态精度。随后利用Matlab软件建立了基于滑模变结构的永磁同步电动机矢量控制系统的仿真模型，并在此基础上进行了大量的仿真研究，仿真及实验结果均表明本系统具有良好的动静态特性以及较高的精度,可以满足伺服控制的需要。关键词：永磁同步电动机；矢量控制；空间电压矢量脉宽调制；系统仿真IITheslidingmodevariablestructurecontrolofpermanentmagnetsynchronousmotorMajor:automationStudentNumber:201010311326Name:MengXianlingTutor:GouYilanAbstract：Thispaperestablishedthemathematicalmodelofpermanentmagnetsynchronousmotor,furtherstudythetheoryofvectorcontrolofpermanentmagnetsynchronousmotor.Inordertoobtainbettercontroleffect,thispaperadoptsthespacevoltagevectorpulsewidthmodulationmethod,decidestousethevectorcontrolschemebasedonid=0andadoptscurrentfeedbackcontrolsystemstructure,andanalyzesthemainfactorsthatthecurrentdecoupled.Finally,onthebasisoftheslidingmodevariablestructuretheory,thecontrollerofslidingmodevariablestructurecombinedwithPIwasdesigned,andovercomehighfrequencyvibrationoftheconventionalslidingmodecontroller(VSC)neartheslidingsurface,improvethesteady-stateaccuracy.ThensimulationmodelofpermanentmagnetsynchronousmotorvectorcontrolsystembasedontheslidingmodevariablestructureisestablishedbyusingtheMatlabsoftware,andthencarriesonExtensivesimulationstudiesonthebasisofthetheory,thesimulationandexperimentalresultsshowthatthissystemhasgooddynamicandstaticcharacteristicsandhighaccuracy,thesystemcanmeettheneedsoftheservocontrol.Keywords:permanentmagnetsynchronousmotor;vectorcontrol;thespacevoltagevectorpulsewidth;systemsimulationIII目录1绪论..............................................................................................................................................11.1伺服系统是概况...............................................................................................................11.2国内外研究现状和运用前景...........................................................................................11.3滑模变结构控制...............................................................................................................31.3.1变结构控制理论....................................................................................................31.3.2滑模变结构控制在电机中的应用........................................................................31.4课题的背景和意义...........................................................................................................41.5本论文的主要研究内容...................................................................................................42.永磁同步电机的控制策略...........................................................................................................52.1全数字模糊数学模型.......................................................................................................52.1.1静止坐标系下,永磁同步电动机的数学模型.......................................................52.1.2坐标变换................................................................................................................72.1.3旋转坐标系下PMSM的数学模型......................................................................82.2PMSM矢量控制的基本原理.........................................................................................112.3本章小结.........................................................................................................................133基于滑模变结构的永磁同步电动机矢量控制系统.................................................................143.1滑模变结构控制基本原理.............................................................................................143.1.1滑动模态的定义及数学表达..............................................................................143.1.2滑模变结构控制的基本问题..............................................................................153.1.3滑模变结构控制的设计方法..............................................................................163.1.4滑模变结构控制系统的抖振问题分析..............................................................173.2滑模变结构速度控制器.................................................................................................173.2.1永磁同步常规滑模速度控制器的设计..............................................................173.2.2滑模控制与PI结合控制器的设计....................................................................193.3本章小结.........................................................................................................................204PMSM滑模变结构矢量控制系统的仿真研究.........................................................................204.1控制系统的仿真.............................................................................................................21IV4.2坐标变换的仿真模块.....................................................................................................214.3SVPWM的仿真模块......................................................................................................224.3.1合成矢量所处扇区N的判断.............................................................................234.3.2基本矢量作用时间计算仿真模型......................................................................234.3.3三相SVPWM波的形的合成..............................................