AVy变频器在实际调试及应用中的故障分析

通用变频器的控制方式一般有磁通矢量控制旺（FOC）、DTC控制、转矩矢量控制等方式,矢量控制的基本原理是通过测量和控制异步电动机定子电流矢量,根据磁场定向原理分别对异步电动机的励磁电流和转矩电流进行控制,从而达到控翻异步电动机转矩的目的。具体是将异步电动机的定子电流矢量分解为产生磁场的电流分量（励磁电流）和产生转矩的电流分量（转矩电流）分别加以控制,并同时控制两分量间的幅值和相位,即控制定子电流矢量。     

异步电机参数自适应矢量控制系统

本文研究交流异步电动机矢量控制系统．分别建立电动机转子参数和定子参数的辨识模型，实时校正矢量控制系统中电机参数的变化．保证了交流调速系统的稳定性和准确性．     

基于SVPWM的异步电动机变频调速系统

在分析了电压空间矢量调制原理的基础上,建立了三相异步电动机在旋转坐标系下的数学模型.并利用M8tlab软件对电机的SVP删交流调速系统进行了仿真,并分析了仿真结果.     

基于模糊逻辑的异步电动机转速控制

本文设计了基于模糊逻辑控制的速度控制器,以提高异步电动机矢量控制系统对参数变化和负载扰动的鲁棒性,并通过MABLAB/SIMULIINK仿真将其与PI控制的系统速度响应进行比较,仿真结果表明模糊控制能使系统取得较好的控制性能并具有较强的鲁棒性.     

基于交互式MRAS的矿山电机车无速度传感器技术研究

因矿山环境恶劣,矿山电机车速度传感器经常损坏,可靠性低。本文提出基于交互式模型参考自适应系统(交互式MRAS)矿山电机车速度辨识方法,利用系统参考模型与可调模型偏差计算转速和定子电阻。结合异步电动机矢量控制系统分析,证明该方案具有速度快、精度高等特点。     

浅析异步电动机直接转矩控制系统

直接转矩控制是一种新型异步电动机变频调速技术。根据定子磁链和输出转矩直接选择相对合适的电压矢量,通过电压空间矢量来控制定子磁链的旋转速度,从而改变定子、转子磁链矢量之间的夹角,进而实现对电动机转矩的控制。其优点是不需要对电机数学模型进行简化处理和复杂的矢量变换,控制系统结构简单,控制手段直接,转矩动态响应快。     

矢量控制变频调速系统的建模与仿真

本文详细阐述了异步电机矢量控制原理,分析了异步电机的动态电磁关系和坐标变换原理,建立了异步电动机在不同坐标系上的数学模型说明了三相异步电机数学模型的解耦作用和原理,给出了矢量变换实现的方法和步骤。     

关于电动机的机械特性分析

异步电动机具有结构简单、运行可靠、价格低、维护方便等一系列的优点,因此,异步电动机被广泛应用在电力拖动系统中。尤其是随着电力电子技术的发展和交流调速技术的日益成熟,使得异步电动机在调速性能方面大大提高。文章阐述了异步电动机结构,运行可靠、价格低、维护方便等一系列的优点,目前,异步电动机的电力拖动已被广泛地应用在各个工业电气自动化领域中。就三相异步电动机的机械特性出发,主要筒述电动机的启动、制动、调速等技术问题。     

基于S函数的异步电动机起动特性的仿真研究

异步电动机是一个复杂的多变量非线性系统。本文利用Matlab软件中的S函数及仿真程序,结合电机的动态模型,实现了对异步电动机的仿真,并对其起动性能进行研究分析。本文通过实例对异步电动机空载和带载两种情况的起动过程进行仿真研究,仿真结果验证了仿真模型的正确性和有效性。     

异步电动机的自抗扰控制器及其参数整定

异步电动机的控制问题是十分重要的,这是通过一种自抗扰控制器进行控制的,还要对异步电动机的参数进行整定,通过实验进行参数研究,这种仿真实验要将异步电动机进行基本地研究,通过具体的方案进行仿真实验,这样可以有效地进行自抗扰控制器和参数的整定,在闭环系统的使用上就可以保证系统的稳定。本文就是对异步电动机的自抗扰控制器和参数整定进行分析,为相关的亚牛做出贡献。     

Vector control design and experimental evaluation for the brushless doubly fed machine

A new vector control algorithm for the brushless doubly fed machine (BDFM) has been developed. The goal of BDFM control is to achieve a similar dynamic performance to the doubly fed induction machine (DFIM), exploiting the well-known induction motor vector control philosophy. For this purpose, a recently developed unified reference-frame model has been used to develop the vector control strategy. The theoretical considerations for the vector control design, control loops tuning and limits are shown. In addition, practical considerations for the experimental implementation of vector control for the BDFM are shown. Experimental results in a machine prototype confirm the good dynamic performances of this type of control.     

基于随机脉宽调制技术的感应电机矢量控制系统研究

随机脉宽调制技术可以使逆变器输出电压的谐波成分均匀地分布在一个较宽的频率范围内，达到抑制噪声和机械振动的目的．把随机脉宽调制技术引入感应电机矢量控制系统中，保证了调速系统的高性能，同时也降低了电机的有色噪声和机械振动．     

基于DSP的混合动力汽车永磁同步电机的矢量控制系统

为了使混合动力汽车的永磁同步电机获得快速的转速响应和稳定的静态特性,介绍了一种基于数字信号处理器(DSP)的矢量控制方案,将矢量控制方法引入电动汽车的电机控制中,改善了系统的动态性能和静态性能。系统仿真和实验结果表明,这种矢量控制系统动态和静态性能好,可以满足混合动力电动汽车对控制系统的要求,达到了预期的设计目标,使永磁同步电机获得了快速的转速响应和稳定的静态特性。     

Controller design and FPGA implementation of a speed‐sensorless vector‐controlled induction motor drive based on stability consideration

Abstract

The purpose of this paper is to determine the controller parameter tuning range for a speed sensorless vector‐ controlled induction motor drive from the system stability point of view. The tuning rules for conventional PI controllers are mostly based on experience. Trial‐and‐error procedures are used to tune the values of the controller parameters. The relationship between the tuned controller parameters and the stable operating range of the control system is generally not known. This paper starts from establishing complete dynamic models for a sensorless vector‐controlled induction motor drive. The nonlinear dynamic models are linearized around a chosen operating point. The characteristic equation is then derived, which is used to determine the values of the controller parameters corresponding to the marginal system stability. Based on these critical values, the tuning ranges of the controller parameters are obtained, which assures stable operation of the drive in the entire operating region and provides a reference for controller parameter tuning. The proposed method is further extended to include the effect of parameter sensitivity due to motor parameter variation. An experimental setup based on a DSP‐FPGA system is implemented. The simulation and experiments confirm the validity of the proposed approach.     

Fault-tolerant operation of induction motor drives with automatic controller reconfiguration

Proper operation of vector-controlled induction motor drives over the entire speed range critically depends on reliable operation of the feedback sensors. In the event of sensor failures, it is desirable that the induction motor system continue to operate, even if under a diminished performance capacity. This paper describes the development of a fault-tolerant control system for an induction motor with automatic controller reconfiguration. The system adaptively reorganizes itself in the event of sensor loss or sensor recovery to sustain the best control performance given the complement of remaining sensors. Theoretical and experimental results are presented.     

Single-current-sensor-based active front-end-converter-fed four quadrants induction motor drive

Induction motor (IM) is a workhorse of the industry, whose dynamics can be modified close to that of a separately excited DC machine by field-oriented control technique, which is commonly known as vector control of induction machine. This paper presents a complete performance of the field-oriented control of IM drive in all four quadrants with a single-current-sensor-based active front end converter whose work is to regulate DC link voltage, draw pure sinusoidal currents at unity power factor and to facilitate bi-directional power flow between the grid and the drive. The entire system is completely modelled in MATLAB/SIMULINK and the results are discussed in detail. The vector control analogy of the back to back converters is highlighted along with the experimental results of field-oriented control of induction machine using a dsPIC30F6010A digital signal controller.     

Experimental determination of mechanical parameters in sensorless vector-controlled induction motor drive

High-performance industrial drives widely employ induction motors with position sensorless vector control (SLVC). The state-of-the-art SLVC is first reviewed in this paper. An improved design procedure for current and flux controllers is proposed for SLVC drives when the inverter delay is significant. The speed controller design in such a drive is highly sensitive to the mechanical parameters of the induction motor. These mechanical parameters change with the load coupled. This paper proposes a method to experimentally determine the moment of inertia and mechanical time constant of the induction motor drive along with the load driven. The proposed method is based on acceleration and deceleration of the motor under constant torque, which is achieved using a sensorless vector-controlled drive itself. Experimental results from a 5-hp induction motor drive are presented.     

THE DESIGN AND IMPLEMENTATION OF SELF-COMMISSIONING TECHNIQUES FOR A VECTOR-CONTROLLED INDUCTION MOTOR DRIVE

ABSTRACT

This paper presents the design and implementation of self-commissioning techniques for a vector-controlled induction motor drive. Two key techniques are involved in the self-commissioning of a vector-controlled induction motor drive. The identification of the electric and mechanical parameters of motor and load, and the tuning of controller parameters that are to meet performance specifications in the various vector control loops, are proposed. The proposed techniques are further verified by experiments. Close simulation and experimental results are obtained.     

Advances in vector control ofac motor drives — A review

This paper attempts to present a comprehensive review of the advances made in vector control or field orientation as applied to high performanceac motor drives. Brief application survey, machine models ind-q representation, implementation issues with inverters and cycloconverters, parameter effects etc for both induction and synchronous motor vector control are dealt with and sample results from studies on them are presented. The latest advance on this control like direct torque control (DTC) has been briefly discussed. A substantial updated bibliography, though by no means complete, is included for those who are interested in keeping track of the present state-of-the-art and working further in this area.