基于PWM 控制的轨道牵引系统变频器设计
来源:网络 作者:网络转载 2019-09-23 阅读:580
摘要:牵引电机车变频器广泛采用PWM控{6I技术,由于它可同时实现变频、变压、反抑制谐波的特点,在将稳定的直流电变成一定频率的交流电时,可根据电机车的实际需要,变化牵引电机的电压频率值,通过双PWM变频调速系统简化硬件,实现电机车的调速控制,提高控制精度和系统的可靠性,且系统简单,具有广阔的应用前景。关键词:PWM控{6I;牵引变频器;设计[b][align=center]Design of the frequency converter in track drivingsystem based oi1 the PWM controlLiu Xin—hui.Cai Wei(Lanzhoupolytechnic college,Lartzhou C.ansu 730050,China)[/align][/b]Abstract:PWM control technology which was widely used in locomotive frequency converter can realize frequency conversion and voltage conversion to counter—restrain hgrmonious simultaneity.When it changes stable DC into the certain frequency AC.accordingtothe electriclocomotive actual need,to changethe driving voltagefrequency value ofthe electrical machinero Y,andtIIl the doublePWM frequency conversion velocity modulation system to simplify hardware,inthiswaywill realize the electric locomo tive velocity modulation controlI increase the control precision and the system reliability。The system will be simpleI and also has a extremely broad application prospect.Key words:PWM control;driving frequency converter design1 引 言 为适应煤炭、冶金、矿山等场所运输牵引需要,我国自行设计了7T及7T以上多种类型牵引电机车,它们能在窄轨机车运行巷道中安全工作,其长度、宽度和转弯半径都满足冶金矿山、煤矿等特殊工况的使用要求,其核心技术是基于PWM控制的变频调速技术,与直流调速和其它交流调速相比,其变频调速器的调速范围、过载能力、调速精度、动态响应、功率因数、运行效率、维护要求等方面均有明显优势,同时该装置无触点,可调频率,调电压,简化维护,甚至实现免维护。2 牵引变频器的分析与设计 利用牵引变频器拖动电动机,起动电流小,能实现软起动和无级调速,方便地进行加减速控制,使电动机获得高性能,大幅度节约电能。[b][align=center]详细内容请点击:基于PWM 控制的轨道牵引系统变频器设计[/align][/b]