Atif Iqbal

High Performance Control of AC Drives with MATLAB/Simulink Models: Abu-Rub/High Performance Control of AC Drives with MATLAB/Simulink Models

Description: A comprehensive guide to understanding AC machines with exhaustive simulation models to practice design and control Nearly seventy percent of the electricity generated worldwide is used by electrical motors. Worldwide, huge research efforts are being made to develop commercially viable threeand multi-phase motor drive systems that are economically and technically feasible. Focusing on the most popular AC machines used in industry – induction machine and permanent magnet synchronous machine – this book illustrates advanced control techniques and topologies in practice and recently deployed. Examples are drawn from important techniques including Vector Control, Direct Torque Control, Nonlinear Control, Predictive Control, multi-phase drives and multilevel inverters. Key features include: systematic coverage of the advanced concepts of AC motor drives with and without output filter; discussion on the modelling, analysis and control of threeand multi-phase AC machine drives, including the recently developed multi-phase-phase drive system and double fed induction machine; description of model predictive control applied to power converters and AC drives, illustrated together with their simulation models; end-of-chapter questions, with answers and PowerPoint slides available on the companion website company website This book integrates a diverse range of topics into one useful volume, including most the latest developments. It provides an effective guideline for students and professionals on many vital electric drives aspects. It is an advanced textbook for final year undergraduate and graduate students, and researchers in power electronics, electric drives and motor control. It is also a handy tool for specialists and practicing engineers wanting to develop and verify their own algorithms and techniques.

A novel technique for the design of controller of a vector-controlled permanent magnet synchronous motor drive

The design of the speed controller is important from the point of view of imparting desired transient and steady-state characteristic to the speed-controlled permanent magnet synchronous motor (PMSM) drive system. The design and analysis of a vector-controlled closed-loop permanent magnet synchronous motor (PMSM) drive is presented in this paper work. The effect of different factors like the time constant of proportional speed controller and the motor time constant on drive performance is analyzed. The D-partition technique is used to investigate the interaction of proportional speed time constant, amplifier gain and armature time constant on the system stability. In this paper work, a procedure has been suggested to find the optimum value of the amplifier gain to give minimum settling time, which is the most important requirement of high performance drives or high fidelity drives. Using the D-partition technique, a comprehensive performance analysis of system design is carried out in this paper work in MATLAB environment.

Stability Analysis of a Three-Phase Converter Controlled DC Motor Drive

The design of the speed controller is important from the point of view of imparting desired transient and steady-state characteristic to the two quadrant converter controlled separately excited dc motor drive system. The poor design of the controller causes in losses and inefficient operation of the drive. Although many improved PI/PID design methods are proposed, such as root locus, Ziegler-Nichols (Z-N) methods etc., but they have shortcomings such as long testing time and limited control performance. To overcome this difficulty, we make use the theory of D-partition technique. Based on analytically characterizing the D-partition boundaries of the controller parameter space, necessary conditions of the maximum degree of stability are derived. The design of the controller and analysis of a converter controlled closed-loop dc motor drive is presented in this paper work. The effect of different factors like the time constant of proportional speed controller and the motor time constant on drive performance is analyzed. The D-partition technique is used to investigate the interaction of proportional speed time constant, amplifier gain and armature time constant on the stability of two quadrant converter-controlled closed loop separately excited dc motor drive. In this paper work, a procedure has been suggested to find the optimum value of the amplifier gain to give minimum settling time, which is the most important requirement of high performance drives or high fidelity drives. Using the D-partition technique, a comprehensive performance analysis of system design is carried out in this paper, using MATLAB environment.

Simplified stability analysis of a three-phase induction motor drive system

Stability analysis is one of the most important aspects to determine the performance of electric drive system during dynamic and steady state operating conditions. This is especially important since the motor operates in wide range of frequencies with the complex types of control strategies such as field oriented control and direct torque control. A new dynamic model is developed to study the instantaneous effect of varying voltage/current. In addition small signal equations are developed to evaluate the control performance by using conventional techniques such as Bode plot, Nyquist plot etc. In practice voltage-current relationships are used to perform such study. In this paper, the dynamic model based on voltage-flux-linkage relationship is utilized to evaluate the control performance of the three phase induction motor drive system. The presented model offers advantage of simplified analysis and provides more meaningful information. A study of voltage-current model and voltage-flux-linkage model has been carried out in this paper and important inferences are drawn from it. Analytical and simulation approach is used in the paper.

Simple Voltage Modulation Technique for Quasi Six-Phase Series Connected Two-Motor Drive System

Several proposals on multi-phase multi-motor drive systems are given in the literature. This paper focuses on one such configuration with stator windings of two quasi six-phase machines (two set of stator windings with 30 phase displacement) connected in series and supplied from a single sixphase voltage source inverter, forming two-motor drive structure. A simple voltage modulation technique is described for six-phase voltage source inverter feeding such motor drive configuration. The proposed modulation is based on the sampled reference voltages and effective time concept. In the proposed technique the actual switching times for each inverter legs are obtained directly in simple form. The execution time in real time application can be reduced significantly compared to the conventional space vector pulse width modulation (SVPWM). Simulation and experimental results are provided to validate the