Computer Aided Analysis ofAC Drive System with Soft Switching Inverter

The design of a general simulation package for AC drive system with soft switching inverter is discussed in this paper. This package is based on the secondary developing of the nonlinear control system simulation language SIMNON. Being constructed with modularization programming, the package can be used for general purposes conveuieutly and has strong graphic functions. The design principle for this simulation package is discussed in datail in this peper; and an application example (DSC controlled AC drive system with RDCLI) as well as its simulation results are given.

Design,Implementation and Performance of Synchronous Current Regulators for AC Drives

Accurate,high bandwidth current control is a requirement for high performance vector controlled AC drives.Synchronous PI current regulators are the preferred solution for this purpose.Design and operation principles of synchronous PI current regulators are well established.However,there are a number of issues that must be considered,especially when the drive must operate at high synchronous frequencies,including regulator design,effects due to discretization and the associated delays,voltage constraints and current sampling issues among other.Inadmissible degradation of the current regulator performance and consequently of the drive can occur otherwise.

A Review of Nonlinear Kalman Filter Appling to Sensorless Control for AC Motor Drives

Sensorless control of AC motor drives,which takes the advantages of cost saving,higher reliability,and less hardware,has been developed for several decades.Among the existing speed sensorless control methods,nonlinear Kalman filter-based one has attached widespread attention due to its superb estimation accuracy and inherent resistibility to noise.However,the determination of noise covariance matrix and robustness of model uncertainties are still open issues in practice.A great number of studies try to solve these problems in resent years.This paper reviews the application of extended Kalman filter(EKF),unscented Kalman filter(UKF),and cubature Kalman filter(CKF)in speed sensorless control for AC motor drives.As an iterative algorithm,EKF has advantages in processor implementation.However,EKF suffers from the linearization error and model uncertainties when applying to sensorless control system.This paper presents the predominant improvements of EKF which is also applicative in UKF and CKF mostly.

A Review of Sensorless Control Methods for AC Motor Drives

In recent years,the application of sensorless AC motor drives is expanding in areas ranging from industrial applications to household electrical appliances.As is well known,the advantages of sensorless motor drives include lower cost,increased reliability,reduced hardware complexity,better noise immunity,and less maintenance requirements.With the development of modern industrial automation,more advanced sensorless control strategies are needed to meet the requirements of applications.For sensorless motor drives at low-and zero-speed operation,inverter nonlinearities and motor parameter variation have significant impact on the stability of control system.Meanwhile,high observer’s bandwidth is required in high-speed region.This paper introduces the state of art of recent progress in sensorless AC motor drives.In addition,this paper presents the sensorless control strategies we investigated for practical industrial and household applications.Both advanced sensorless drives of induction motor(IM)and permanent magnet synchronous motor(PMSM)are presented in this paper.

Electric Drive for an In-wheel Fractional-slot Axial Flux Machine

This paper describes the electric drive for an in-wheel fractional-slot axial flux machine,designed for achieving a wide flux-weakening operating region.By using a slotted stator with fractional-slot windings and additional cores enclosing end windings,the axial flux machine reaches a wide constant power speed range.The machine is designed for increasing flux-weakening capability while obtaining low harmonic back-electromotive force and low cogging torque.A 10 N.m axial flux machine exhibiting 3 to 1 flux-weakening speed range has been built.A flux-weakening controller,able to maximize the output torque in the flux-weakening region,is designed and implemented.The goodness of both design and control algorithm is proved by experimental tests.However,such a fractional-slot machine has not only advantages.Rotor losses are very high,and they have to be properly considered during the design process.

AC4000交流传动电力机车的研制

从基本特点、总参数、设备布置、电气原理和机车特性等方面简要介绍了ＡＣ４０００交流传动电力机车。

AC PDP高阻维持驱动方法

针对AC PDP传统维持驱动方法存在零电压状态,造成两次维持放电之间壁电荷损失的问题。本文提出了一种AC PDP高阻维持驱动方法,在该方法中,采用高阻状态替换了传统维持驱动方法中的零电压状态。从而去掉了两次维持放电中间的放电通路,使得壁电荷在两次维持放电之间不会损失。实验结果表明,采用该方法,可以增大AC PDP维持电压余裕度,降低维持电压,提高维持放电的稳定性。

我国首台AC4000交流传动电力机车系统设计与总参数选择

论述了我国首台ＡＣ４０００交流传动电力机车方案选择与系统设计的基本原则，说明了选择电压型交直交变流器供电的异步机系统作为电力传动装置的优越性。介绍了机车总参数。

ACS800变频器在造船门式起重机起升调速系统中的应用

为了提高造船门式起重机起升调速系统的性能,以一台造船门式起重机为研究对象,采用ACS800变频器构建了直接转矩控制的起升机构交流调速系统。实践结果证明,该系统运行良好,实现了GB/T 27997-2011《造船门式起重机》标准的相关要求。

Application of Full-Order and Simplified EKFs to Sensorless PM Brushless AC Machines

This paper employs an extended Kalman filter (EKF) to estimate the rotor position and speed of a vector controlled surface-mounted permanent magnet (PM) brushless AC (BLAC) motor from measured terminal voltages and currents only. Both full-order and simplified EKFs are employed and their simulated performance capabilities are compared. Excellent agreement is achieved between estimated and commanded results. The EKF is also employed to identify the stator flux-linkage due to the PMs, which is influenced by temperature variation and magnetic saturation.

ACS6000交流传动系统在铝冷轧机主传动中的应用

介绍ABB中压传动系统ACS6000在铝冷轧主传动中的应用,主要描述ACS6000中压变频器在铝冷轧机应用中的系统构成和控制原理。

一个基于ACE的微总线的设计与实现

针对分布式的应用系统,设计了一个基于ACE的微总线架构。该架构将互联的网络作为软总线的物理基础,挂接在总线上的构件按照协议具备了驱动能力,构件之间的互操作问题采用Peter Herzum互操作参考模型来解决。构件只有分工不同,不分优先级,彼此之间是平等的。

TMdrive-10e2系列逆变器电流过载能力指标剖析

利用笔者所首创的描述电流过载能力指标4要素原则和等效电流系数KC法系统地分析和研究了TMEIC公司TMdrive-10e2系列逆变器在各种不同工况下的电流过载能力指标,发现该系列逆变器的平均相对电流过载能力指标小于交流传动系统中的Siemens公司6SE70系列工程型变流器的相应值,给出了市场上几种重要交直流变流器的平均电流过载能力指标的序次。根据笔者所首创的基于变流器电流过载能力指标的缺陷理论,可判定TMdrive-10e2系列逆变器不存在第1~第3类缺陷。

一种精确控制初级反馈AC/DC转换器输出电压的方法

初级反馈AC/DC转换器是近几年出现的一种新结构,如何精确控制它的输出电压是此结构的设计难点之一.描述了初级反馈AC/DC转换器的结构,并对其反馈电压波形进行了详细的分析.推导出初级反馈AC/DC转换器驱动管导通时间和变压器次级线圈退磁时间之间的关系,提出了利用驱动管导通时间确定反馈电压采样时刻的方法,从而实现对初级反馈AC/DC转换器输出电压的精确控制.测试结果表明,利用此方法设计的初级反馈AC/DC转换器,其输出电压的负载调整率2.92%～3.38%.

基于CUK电路无电解电容的AC-DC LED驱动电源设计

为提高LED驱动电路的使用寿命并优化其整体性能,提出了一种新型的基于CUK电路的非隔离型AC-DC电路拓扑。该拓扑通过在基本的CUK电路上增加一个MOSFET来实现。可实现高功率因数并消除电解电容。对于该结构进行了详细分析,并且使用LTspiceIV软件对其进行了开环和闭环的仿真,最后通过带载实验来证实分析的正确性。

AC-PDP新型驱动电路的设计与实现

针对现有AC PDP驱动电路产生波形不够灵活的缺点,基于隔离变压器耦合的思想,采用模块化、层次式的设计方法,设计并实现了一种新型的驱动电路。经理论分析、计算机模拟和实际测试,此电路能够实现控制信号的传递,产生正确的输出,并能够产生宽脉冲、窄脉冲、斜坡脉冲、负脉冲等信号。

空调器AC电机驱动智能功率模块FSAM20SL60

FSAM20SL60是仙童公司为驱动1.4kW的空调器AC电机在最近研制和设计的一种先进的智能功率模块。介绍它的特点和应用。

Effect of Driving AC Voltage Frequency on Breakdown Voltage in Dielectric Barrier Discharge at Atmospheric Pressure in Helium

For dielectric barrier discharge(DBD)driven by AC voltage in helium at atmospheric,the relationship between the breakdown voltage and the driving frequency is experimentally investigated using a pair of parallel electrodes.The gap between the electrodes is 1 mm,4 mm,7 mm,and 10 mm,respectively.Meanwhile with an increment of 2 kHz,the applied AC voltage varies from 12 kHz to 30 kHz.In each experiment,the driving voltage increases slowly,till the helium-filled gap breaks down.Based on a number of experimental results and further analyses,conclusions are obtained as follows.(1)For a small gap(1 mm),the voltage that triggers the first breakdown(Uf)is close to the one that sustains steady breakdowns(Us).However,in the larger gaps(4,7,and 10 mm),Uf is obviously larger than Us.(2)For a fixed gap,Uf does not change significantly with the driving frequency,whereas in the gaps except the 1 mm one,Us drastically decreases with the increase of driving frequency.(3)The motion of residual space charges and the dissipation of positive column,two reasonable factors that explains asymmetrical discharges,are also main reasons for the effect of the driving frequency on the breakdown voltages.

ACS800交流变频传动装置在顶驱转盘复合双驱动石油钻机系统中的应用

简要介绍了ACS800交流变频传动装置工作原理和独特硬件设计,结合顶驱转盘复合双驱动石油钻机在石油钻采工艺中的作业特点和ACS800交流变频装置的软件功能,设计了一套可靠性高,可用性强,设备使用效率高的石油钻机电控系统,并给出了ACS800装置的关键参数设置和PLC程序设计的主要流程。

基于ACS800-01变频器的冷喂料挤出机直流驱动系统改造

目前冷喂料挤出机驱动系统一般采用直流驱动系统,但随着国家对节能减排越来越重视,直流驱动固有的缺点越发明显。然而,交流变频调速技术日益成熟,其调速性能可与直流调速系统相媲美,而且造价低廉,操作便利,已经成为当前电力驱动系统的主流。由于挤出机直流驱动系统在运行过程中会出现不可避免的磨损、冒火花等现象,导致系统的工作效率、可靠性和安全性降低,进而影响生产和工艺,因此,需要对现有直流驱动系统进行交流变频改造。针对冷喂料挤出机对驱动系统的要求,本文提出了基于ACS800-01变频器的交流驱动系统代替直流调速的方案,此方案提高了系统的稳定性和工作效率,同时也降低了后期的维护成本。