国电四维高压变频器在唐山德龙钢铁公司同步电动机的应用

高压同步电动机以其功率因数高、运行转速稳定、低转速设计简单等优点在高压大功率电气驱动领域有着大量的应用。但同步电动机物理过程复杂、控制难度高的特点,一直制约着同步电动机的变频应用。国电四维公司技术人员经过大量的理论分析、仿真、实验,解决了诸多关键问题．已于2012年底成功地将SWdrive系列高压变频器应用于唐山德龙钢铁公司的4200kW／10kV同步电动机上,本文将简要介绍应用的相关情况。     

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。     

高压变频器在同步电动机上的应用

高压同步电动机以其功率因数高、运行转速稳定、低转速设计简单等优点在高压大功率电气驱动领域有着大量的应用。利德华福技术人员经过大量的理论分析、仿真、实验,解决了同步电机整步等关键问题,已于2006年4月底成功地将单元串联多电平型高压变频器应用于巨化股份公司合成氨厂的1000kW／6kV同步电动机上,本文将简要介绍应用的相关情况。     

高压变频器在增安型无刷励磁同步电动机上的应用

无刷励磁同步电动机由于没有滑环、碳刷等可能产生火花的环节,在化工、煤矿等具有爆炸性环境的场所有着较为广泛的应用本文基于本公司成功的改造无刷励磁同步电动机的经验,对无刷同步电动机在变频运行中所遇到的各种问题进行了详细的分析.并提出了解决方法,使变频器能够驱动无刷同步电动机可靠、经济地调速运行。     

对高压同步电动机中变频软启动技术应用的几点探讨

同步电动机因为其高效的功能以及优越的特性在工业生产中普及使用,然而同步电动机的启动物理原理复杂、操控难度大,特别是大容量同步电动机的开启技术性强;而且较早阶段的同步电动机晶闸管调速出现问题的概率大,稳定性差,这部分难题对同步电动机中变频软启动技术的运用形成了限制.笔者在下文中间探讨高压同步电动机中变频软启动技术的运用.     

变频技术在电厂中的应用

<正>交流变频调速技术以其自身的优势,目前在各个领域得到了广泛的应用。高压大功率变频器在冶金、化工、纺织等领域也得到了广泛应用,近几年在发电厂也得以应用。一、高压大功率变频器的发展概况交流电动机特别是异步电动机由于结构简单、价格便宜、维修方便等优点被广泛使用。但其调速性能在以前赶不上直流电动机,所以交流电动机的调速技术一直是世界     

无刷同步电动机的变频运行方式的研究

近年来随着节能观念的转变,大量的无刷同步电动机将面临变频改造。本文简要介绍了无刷同步电动机的结构、原理和运行方式,对无刷同步电动机在变频运行中所遇到的投励、整步、励磁调节等问题进行了详细的分析,提出了无刷同步电动机的变频运行方式,使得在该方式下,变频器能够驱动无刷同步电动机可靠、经济地调速运行。     

基于Matlab的正弦波永磁同步电动机变频调速仿真

该文首先论述了永磁同步电动机的应用情况以及促进其迅速发展的几个因素,接下来列出了永磁同步电动机调速的数学方程组的情况,随后又阐述了正弦波永磁同步电动机变频调速的原理以及仿真模型,最后通过观察Matlab的仿真波形结果,对正弦波永磁同步电动机变频调速系统进行进一步的分析。     

高频斩波串级调速技术异军突起

基于高压大中型异步电动机节能调速的需求和异步电动机调速领域的技术状况，保定华仿电控有限公司决定联合华北电力大学对高压大容量异步电动机节能调速技术进行科研攻关。     

电动汽车用永磁同步电动驱动系统控制策略比较研究

当前,在我国环境污染、能源匮乏的情况下,电动汽车作为新一代的交通工具,对大气的污染几乎为零,再加上电动汽车以电能为能源,电能与其他能源比相对低廉,所以,进入21世纪后,电动汽车很受人们的欢迎。电动汽车的核心部分是驱动系统,而电动汽车的主要原件就是驱动电机。在诸多电动机中,永磁同步电动机无疑是电动汽车的首选电动机,这是因为永磁同步电动机不仅具有较好的调速性能,而且还具有高效率、高功率等优点。所以,我们很有必要对永磁同步电动机做更深一步的研究。     

HINV系列同步电机高压变频调速系统在冶金行业上的应用——天丰钢铁烧结厂主抽、冷抽风机同步电机变频改造

本文介绍了动力源HINV高压大功率同步电机变频调速系统在天津天丰钢铁烧结厂同步电机上的应用。详述了动力源高压变频器在大功率同步电机改造的应用及整体解决方案。同时对烧结工艺以及对同步电机高压变频调速节能改造效果进行了分析和阐述。     

Speed and Load Torque Observer Application in High-Speed Train Electric Drive

This paper presents an application of induction motor mechanical speed and load torque observers in high-speed train drives. The observers are applied for a 1.2-MW electric drive with an induction motor. The goal of using such observers is to utilize computed variables for diagnostic purposes of speed sensors and torque transmission system. The concept of diagnostic system is presented in this paper, and proper criteria are proposed. The suggested system is designed to work without a speed sensor in the case of existing sensor faults. Monitored motor load torque is used to limit the maximum motor torque in the case of existing problems in the gearbox. The results of simulation and experimental investigations for a 1.2-MW induction motor drive are presented.      

Analysis of Performance of Adjustable-Speed Drives during Voltage Sags

The induction motors are the most common electric machines on industrial systems and with extended applications when adjustable speed drives (ASD) are used. The speed drives are based on power electronic devices and therefore they are highly sensitive to electric disturbances such as voltage sags, interruption, etc. Voltage sags has become one of most common power quality problems in the electrical systems, producing negative effects mainly in loads with power electronic technology. In this paper, the analysis of the effects produced by voltage sags in the ASD and the induction motor are presented. The electric system used for the analysis is conformed by an induction motor, an AC drive with V/Hz control scheme and a step down transformer connected in Yd. The voltage sags were produced by faults in the electric system with a time duration of 6 cycles (0.1 s). The whole electric system was modeled and simulated in Matlab/Simulink environment. The operating conditions of the induction motor was 80% of nominal speed and full load. The obtained results show high sensitivity of the drive, mainly to the dc-link voltage drop, resulting in a motor speed drop and overcurrents in the drive feeders at the ending sag. The adopted parameters used as a limit for the speed drive disruption were 5% of variation in the motor speed and 1.5 p.u. for the peak current. The most severe effects occur with sags type A and G due to three-phase and two-phase to ground faults respectively. The effect of these sags produced a dc-link voltage drop higher than 30% and therefore the drive disruption as a result of the operating limits exceeded. With voltage sags type C and D, caused by single-phase to ground and two-phase faults respectively, the effects produced in the drive and the motor are negligible.     

基于场效应管的直流电机驱动控制电路设计

以N沟道增强型场效应管为核心,基于H桥PWM控制原理,设计了一种直流电机正反转调速驱动控制电路,满足大功率直流电机驱动控制.实验表明该驱动控制电路具有结构简单、驱动能力强、功耗低的特点.     

Computer-aided design and analysis of direct-driven wheel motordrive

This paper presents the computer-aided design (CAD) and performance analysis of a novel direct-driven wheel brushless DC motor drive for electric vehicles (EVs). The proposed motor is a permanent magnet square-wave motor, whose rotor with rare earth magnets forms the exterior of the motor, which can be fitted with a wheel tire to realize the direct drive for each wheel of an EV. The interior stator with its windings is rigidly mounted onto the suspension and frame structure of the vehicle. In order to achieve the direct drive without any mechanical transmission for EVs, the wheel motor has been designed as a low-speed high-torque motor. The design and optimization of the motor geometry was achieved with the aid of finite-element electromagnetic field analysis. Simulation studies on the transient performance of the motor drive were also carried out. This involved the creation of the motor transient model and formulation of a motor control strategy to ensure the wheel motor drive runs efficiently in the entire permitted speed and load range. The application of CAD techniques in the design of this very unconventional drive is described in this paper     

Comparison of electrical drives for road vehicles

The low storage capacity of presently available galvanic batteries restricts the effective use of electrically driven vehicles to a limited range of transportation jobs. For this application any change from vehicles driven by internal combustion engines to vehicles driven by electric motors can only be justified if the use of electrical drives results in an overall cost reduction. This criterion means that a direct current, separately excited motor with its speed controlled by field weakening is the best solution. In a conventionally designed motor the attainable speed range is limited to approximately 1:3. In most cases additional means for the extension of the driving range are required. If, however, the motor is equipped with an additional compensation winding, a controllable speed range of close to 1:8 is obtainable by field weakening. Acceleration characteristics are applied to evaluate the various drive units which provide advantages in energy consumption and disadvantages in the acceleration time, and vice versa. On the basis of test vehicles with various drive systems, design of the required control is explained. Additional requirements for automatic control are partially offset by the additional protective devices required to restrict the effects of faulty handling of a manually controlled drive.     

A five-leg inverter for driving a traction motor and a compressor motor

This paper presents an integrated inverter for speed control of a traction motor and a compressor motor to reduce the compressor drive cost in electric vehicle/hybrid electric vehicle applications. The inverter comprises five phase-legs; three of which are for control of a three-phase traction motor and the remaining two for a two-phase compressor motor with three terminals. The common terminal of the two-phase motor is tied to the neutral point of the three-phase traction motor to eliminate the requirement of a third phase leg. Further component reduction is made possible by sharing the switching devices, dc bus filter capacitors, gate drive power supplies, and control circuit. Simulation and experimental results are included to verify that speed control of the two motors is independent from each other.     

Novel motors and controllers for high-performance electric vehiclewith four in-wheel motors

We have, in accordance with new concepts, undertaken the development of a high-performance electric motor vehicle, designated as the IZA. The main performance features of the IZA are a maximum speed of 176 km/h, a range of 548 km per charge at a constant speed of 30 km/h, and acceleration from 0 to 400 m in 18 s. We have developed a direct driving in-wheel motor and controller in order to achieve high performance characteristics. The in-wheel motor is composed of an outer rotor with a rare earth permanent magnet (Sm-Co) and an inner stator. The motor drive controller consists of a three-phase inverter and a microprocessor-based controller. The maximum output and maximum torque of each total drive system, including motor and inverter, are 25 kW and 42.5 kg·m, respectively, and the total efficiency of the drive system is over 90% at the rated speed. The performance of the motor, controller, and drive system have been confirmed by numerous simplex and vehicle transit tests. This paper describes the design concepts, configuration, and performance of the motor, controller, and drive system developed for this high-performance electric vehicle