罗宾康高压变频器培训班培训资料(完全版)-PART2

ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON变频器基础ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON电机调速的方法电机调速基本公式：N=60f(1-s)/pf=电机供电频率S=(n0-n)/n0转差率P=电机极对数ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON电机调速分类•改变电机的极对数。•改变电机的转差率。1.转子串电阻调速2.定子调压调速3.电磁转差离合器调速4.转子串级调速•改变电机的频率。ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON变频器的基本原理•VVVF-变压变频同时进行是电机正常运行的需要•E=4.44fKNØ•F,电机频率。•N-每相绕组匝数•Ø-电机气隙磁通ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON保持磁通恒定的必要性•电机在任何速度下都应保持磁通恒定。•磁通太强-电机励磁电流过大•磁通太弱-电机铁芯利用不充分，输出力矩下降。ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICONPWM技术•PWM-Pulsewidthmodulatedtechnology•脉冲宽度调制-通过控制电力电子器件的通、断时间及通断次序将直流电压转换为系列宽度不一的矩形脉冲电压。•PWM的类型-•SPWM-正弦波PWM•准优化PWM-SVPWM，SAPWM•优化PWM-指定谐波消除PWM，转矩脉动最小PWMROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICONSPWM•调制信号为正弦波•载波信号为三角波•单极性调制，双极性调制。ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON单相变频器结构图312T1T2++Q4Q1Q2PowerOutputofCellIGBTsQ1-Q4Q3ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICONPWM波形图ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON电力电子器件ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON电力电子器件电阻在电路中起限制电流或产生压降的作用.电阻电感在电路中储存无功能量的作用，限制电流的突然变化。电感ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON电力电子器件二极管广泛应用与各种整流电路中。晶闸管是一种半可控器件，只允许电流在其中单方向流动。三极管（BJT）是一种电流型控制型全控器件，可工作在截止，放大，完全导通三种状态。二极管三极管SCRROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON电力电子器件IGBT-绝缘栅型双极晶体管。是一种广泛应用于变频器中的电压控制型全控器件，开关速度高，电压，电流等级已超过BJTGECIGBTIGCTIGCT（SGCT）门极换流晶闸管，是一种新型的电力电子器件，其突出优点是反向耐压高，通态电流大，开关速度高，在中点钳位式三电平高压变频器中得到应用。ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON通用变频器的分类•按主回路结构形式：1.电流源型2.电压源型•按控制方式分：1.U/F控制2.转差频率控制3.矢量控制4.直接转矩控制ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON高压变频技术简介ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON常见高压变频器的分类•按输出形式分：1.高-高型2.高-底-高型•按电路结构分：1.三电平（中点钳位式）2.电流源型•按缓冲电路分：1.电压源型2.电流源型ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON三电平结构ypicalSnubberROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON三电平输出电压波形ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICONPWM电流源结构MOTORINDUCTIONOutputCapacitorsSERIESGTO's/SGCT’s3个6500V器件串联直接使用TypicalGTO/SGCTSnubber缓冲电路FromSCRConverterFromSCRConverterROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICONPWM-电流源型输出波形ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON单元串联型POWERCELLB1POWERCELLA1POWERCELLC1POWERCELLA2POWERCELLB2POWERCELLC2POWERCELLC3POWERCELLB3POWERCELLA3高压电机控制柜功率单元单元控制板三相高压输入三相变压变频高压输出光纤集成一体式变压器ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON罗宾康高压变频器原理及结构ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON罗宾康高压变频器原理该变频器为单元串联，移相式PWM，电压源型高压变频器，36脉波整流，13电平输出（相电压，对6KV变频器而言）ROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICONTHESESOURCESAREINPHASEATZERODEGREESLAGANGLETHESESOURCESAREINPHASEAT240DEGREESLAGANGLETHESESOURCESAREINPHASEAT120DEGREESLAGANGLE2400VOLTSLINE-TO-NEUTRAL相电压4160VOLTSLINE-TO-LINE线电压完美无谐波变频器设计原理4160V的输出可以通过480V单元的叠加形成,6000V的输出则由630V单元的叠加形成ABCNROBICON罗宾康高压变频技术的领导者2003ROBICONNoportionofthisdocumentmaybereproducedeithermechanicallyorelectronicallywithoutthepriorconsentofROBICON功率单元B1功率单元A1功率单元C