错位移相SPWM控制技术在高压变频器设计中的应用

我国产值能耗在全球范围内居于前列,在对相关技术进行改进的基础之上引入变频调速技术可以有效缓解产品高能耗现状。变频调速技术的应用为大容量高压变频调速技术的推广奠定了坚实基础。文章首先对多电平变频器SPWM调制方法进行介绍,并对其在高压变频器设计中的应用情况进行阐述。     

IGBT直接串联高压变频器在煤矿皮带运输机上的应用

本文分析比较了高压变频调速与其它调速方式如定子调压调速，变极调速，液力耦合器调速的优缺点，介绍了IGBT直接串联高压变频器在煤矿皮带运输机上的应用，实现了宽范围调速，运行稳定可靠，对于煤矿行业变频器的设计与应用有很大的参考价值。     

中国变频器产业的未来发展趋势

本文阐述了目前变频器应用发展状况，对高压变频器的发展做了深入的探讨，分析了交流调速技术的发展现状以及存在的问题，对变频调速技术的发展趋势及今后几年变频器产品的国内外市场状况做了预测。     

单元串联中压变频试验系统控制软件设计

为发展完善中压电机变频调速系统,分析了中压大功率变频器试验系统DSP控制软件的结构,设计了主程序、PWM调制模块、顺序控制模块、WF曲线控制模块,给出了各功能块的实现方法,并对试验结果进行了分析.试验表明所设计的中压变频器系统输出稳定、可靠性高且性能优良.     

ZNR系列智能高压变频器在循环水泵节能改造中的应用

本文介绍了ZNR系列智能高压变频器在化工行业D#空分循环水泵节能改造中的应用,对ZNR系列智能高压变频调速系统的配置与工作原理、循环水泵变频调速节能效果、经济分析等方面的内容进行了分析。指出高压变频调速技术在泵类中的应用具有明显的社会效益和经济效益。     

华北网高压厂用电动机变频调速技术的应用情况

本文描述了高压变频调速应用于厂用电动机的意义，介绍了华北网应用的情况及遇到的主要问题，总结了发电厂对高压变频器的特殊要求，提出发电厂合理应用变频调速技术的最应该关注的一些技术管理问题。     

2012年IGBT继续抢占市场份额

随着现代电力电子技术及计算机控制技术的迅速发展,促进了电气传动的技术革命。交流调速取代直流调速,计算机数字控制取代模拟控制已成为发展趋势。交流电机变频调速是当今节约电能,改善生产工艺流程,提高产品质量,以及改善运行环境的一种主要手段。变频调速以其高效率,高功率因数,以及优异的调速和启制动性能等诸多优点而被国内外公认为最有发展前途的调速方式。以前的高压变频器,由可控硅整流,可控硅逆变等器件构成,缺点很多,谐波大,对电网和电机都有影响。近年来,发展起来的一些新型器件将改变这一现状,如IGBT、IGCT、SGCT等等。由它们构成的高压变频器,性能优异,可以实现PWM逆变,甚至是PWM整流。不仅具有谐波小,     

利德华福高压变频器在天地王坡煤矿皮带机上的应用

采用高压变频器拖动带式输送机,是矿井提高皮带寿命、安全可靠性的重要手段。本文通过对液力耦合器与变频器在皮带机应用的比较、变频调速系统结构的分析,结合山西天地王坡煤业有限公司的皮带改造现场,介绍皮带机系统变频改造相关技术,以及高压变频器在皮带机系统上的应用情况。     

国产高压变频器在水渣系统上的应用

文中介绍嘉兴发电厂为了节能降耗，对水力排渣系统的高压水泵进行变频改造。阐述高压变频器的具体方案、选型和变频原理，并分析应用高压变频调速产生的经济效益。     

合康亿盛大功率高压变频器

HIVERT系列大功率高压变频器是合康电气集团自主研发和生产的高压交流电机调速驱动装置。变频器采用先进的功率单元串联叠波技术、空间矢量控制的正弦波PWM调制方法、新颖的全中文操作界面和高性能IGBT功率器件,可靠性高、性能优越、操作简便。可应用于高压交流电动机驱动的风机、水泵类负载的调速、节能、软启动和智能控制等多种场合。     

基于脉宽调制的D类放大器信号分析与仿真

D类放大器一般采用脉宽调制的方式实现,其实质是一个PWM波的调制解调问题。文章通过对PWM信号的频谱分析,揭示出D类放大器的实现原理。文章还采用MATLAB软件平台,对PWM波的频谱进行了仿真,给出了仿真结果,直观地验证了理论分析的结论。     

A buck quadratic PWM soft-switching converter using a single activeswitch

High-switching frequency associated with soft commutation techniques is a trend in switching converters. Following this trend, a buck pulsewidth modulation (PWM) converter is presented. The DC voltage conversion ratio of this converter has a quadratic dependence on duty cycle, providing a large stepdown. This new buck quadratic PWM soft-single-switched converter, having only a single active switch, provides a high efficient operating condition for a wide load range at high-switching frequency. In order to illustrate the operating principle of this new converter, a detailed study including theoretical analysis, relevant equations and simulation, and experimental results is carried out     

高压变频器在矿井提升机上的应用

高压交流电机变频调速系统以其卓越的调速性能、显著的节电效果以及广泛的适用性,已在电力、冶金、钢铁、石化、煤矿、市政等行业的大、中型企业中应用于风机、水泵、压缩机等通用型负载设备上。而近几年来随着数字信号处理系统（DsP）和脉宽调制技术（PWM）的发展,高压变频调速系统已成功实现高性能矢量控制,并应用于能量回馈型的特殊负...     

SPWM单相逆变电路的谐波分析

在比较单相逆变电路几种PWM调制方法的基础上,对SPWM调制的谐波问题进行了分析,并在Matlab中进行了仿真,从仿真结果可以看出PWM逆变器的谐波特性与调制深度、载波频率有着密切关系,在实际中为得到较好的输出正弦波,既要考虑增加调制深度,又要增加载波频率。     

基于ACS550变频器的恒压供水控制系统设计

文章描述了由ABB公司ACS550变频器组成的恒压供水控制系统的组成，结构及工作原理。系统直接采用变频调速方式自动调节水泵电机的速度，节省了系统投资。文章在论述工作原理，系统配置基础上主要对ACS550变频器的PFC应用宏的参数设置进行了详细分析及描述，为初次应用此类变频器进行供水设计的场合和个人提供了详细的参考依据。     

Space Vector Sequence Investigation and Synchronization Methods for Active Front-End Rectifiers in High-Power Current-Source Drives

Space vector pulsewidth modulation (PWM) schemes for the active front end of a high-power drive normally produce low-order and suborder harmonics due to the low switching frequency and the drifting of synchronization between the PWM waveform and the rectifier input frequency. To provide a synchronized PWM and achieve the best harmonic performance, different space vector sequences suitable for a current-source converter are investigated in this paper. Details on how to achieve the waveform symmetries with a minimum switching frequency for each sequence are discussed. A thorough comparison of the harmonic performance of different space vector sequences is carried out. An optimum space vector modulation method by switching between two best sequences is proposed to achieve the best line-current total harmonic distortion with reduced switching losses. In addition, two synchronization methods, namely a PWM frame regulation method and a direct digital phase-locked loop synchronization method, are proposed. Both methods are equally effective in providing tight synchronization of the PWM waveform with the rectifier input frequency. The work has been verified in simulation and experiment.     

煤矿提升机的变频改造

本文介绍了变频器在煤矿提升机上的应用，指出了原工频控制的弊端，变频改造的难点，四象限运行的特点，回馈功能的实现，论述了该类设备变频改造的前景。     

Analysis of Output Current Ripple rms in Multiphase Drives Using Space Vector Approach

Multiphase variable-speed drives, supplied from two-level voltage source inverters (VSIs), are nowadays considered for various industrial applications. Although numerous pulsewidth modulation (PWM) schemes for multiphase VSIs, aimed at sinusoidal output voltage generation, have been developed, no detailed analysis of the impact of these modulation schemes on the output current ripple has ever been reported. This paper presents a comprehensive analytical analysis and comparison of the output current ripple caused by the application of three different continuous PWM schemes, using a five-phase VSI as an example. Main properties of sinusoidal PWM, fifth harmonic injection PWM, and space vector PWM are elaborated and analyzed using the harmonic flux concept. Space vector theory is applied in the analysis. As a result, harmonic distortion factors are obtained for each PWM scheme. Theoretical considerations are verified by simulations and experimental investigation using a custom-designed five-phase VSI-fed induction motor drive.      

A Multipulse-Structure-Based Bidirectional PWM Converter for High-Power Applications

Multipulse converters are suitable for high-power application with the merits of low switching frequency and perfect harmonic performance. But less controllability and poor regulation lead the restriction on its application. A bidirectional pulsewidth modulation (PWM) converter based on multipulse structure is proposed in this paper, which has the same perfect harmonic performance with very low switching frequency. A special sequential sampling space vector modulation technique, which has the sampling sequence from the lagging module to the leading module, is proposed to make the converter controllable like conventional PWM converters. The harmonic performance and linear regulation capability are analyzed theoretically. The converter is modeled in detail, and an instantaneous feedback control strategy with phase delay compensation and decoupling control is also proposed. The controller parameters are optimized to get high dynamic performance with adequate phase margin and gain margin. A 3-kVA prototype is built, and the simulation and experiment results validate that the proposed converter is quite suitable for high-power conversion.     

改进型PWM灰度调制技术在FED中的应用研究

根据FED显示器响应特性,设计了改进型PWM灰度调制方法.通过确定驱动脉冲顺序,结合人眼的视觉特性设计了最优PWM调制技术.通过调整驱动脉冲增量,实现了单位时间亮暗转换次数最大化和亮暗转换频率均匀化的优化目标.采用FPGA控制技术实现了改进型PWM灰度调制,减少了FED图像灰阶损失,提高了图像显示质量.