Habib-Ur Rehman

• Professor at American University of Sharjah

The widespread adoption of electric vehicle (EV) ecosystem is tantamount to providing a reliable means of charging of vehicle battery through a critical component i.e., an EV charger. This paper presents a bidirectional EV charger system comprising of AC to DC converter, dual active bridge (DAB) and equivalent battery model has been proposed. Furth...

Switched reluctance motors (SRMs) face challenges in achieving high performances in terms of the power factor, torque per ampere, and torque ripples. Although several parameters impact their performance, magnetic saliency has a significant impact. This paper presents a study on the influence of the saliency ratio on the performance of switched relu...

This paper analyzes the battery thermal behaviorand energy consumption of an electric vehicle (EV) tractionsystem using a baseline PI controller and a fuzzy logic controller(FLC). The primary objective of this work is to compare speedregulation performance, battery energy consumption, andbattery temperature effects. The simulation for an indirect f...

Load scheduling and peak demand shaving are two critical aspects of the utility grid operation that help both the grid operators as well as end-users. This paper proposes a two-stage community home energy management system for microgrids. The first stage deals with the dynamic clustered community load scheduling scheme. Comparatively flatter power...

Because of their enhanced performance, the fractional order proportional-integral (FOPI) controllers are becoming an appealing choice for controlling induction motor speed. To implement FOPI controllers, several fractional order integral approximations are available in the literature. The approximation used, and the order of approximation affects t...

This paper proposes an accurate and efficient Universal Adaptive Stabilizer (UAS) based online parameters estimation technique for a 400 V Li-ion battery bank. The battery open circuit voltage, parameters modeling the transient response, and series resistance are all estimated in a single real-time test. In contrast to earlier UAS based work on ind...

This paper presents two battery energy management (BEM) techniques for an electric vehicle (EV) traction system which incorporates an indirect field-oriented (IFO) induction motor (IM) drive system. The main objective of the proposed BEM techniques is to regulate the IM’s speed while minimizing the lithium-ion (Li-ion) battery bank state of charge...

This paper proposes an accurate and efficient Universal Adaptive Stabilizer (UAS) based online parameters estimation technique for a 400 V Li-ion battery bank. The battery open circuit voltage, parameters modeling the transient response, and series resistance are all estimated in a single real-time test. In contrast to earlier UAS based work on ind...

This paper proposes the design of a standalone light emitting diode (LED) photovoltaic street light system for a main road of Dubai, United Arab Emirates. The light poles spacing, height, and the boom angle are kept similar to the existing high-pressure sodium vapor (HPS) lighting system. Furthermore, two type of batteries, Lithium ion and the Lead...

This paper proposes an LC (Inductor and Capacitor) impedance source bi-directional DC–DC converter by redesigning after rearranging the reduced number of components of a switched boost bi-directional DC–DC converter. This new converter with a conventional modulation scheme offers several unique features, such as a) a lower number of components and...

This work improves the performance of electric vehicle traction system by using nonlinear fractional-order proportional integral (FO-PI) controller. The functionality of FO-PI controller is benchmarked against integer-order proportional-integral (IO-PI) controller. A 400 V, 6.6 Ah Li-ion battery bank is designed to power an indirect field oriented...

This paper presents a quick and effective adaptive estimation methodology for parameters estimation of a permanent magnet (PM) DC motor. The proposed technique uses a universal adaptive stabilizer (UAS). This technique estimates PMDC motor parameters in a single experimental run using input voltage, current and speed. Over time, due to aging and we...

This paper aims to improve the performance of DC motor drive system by utilizing a fractional-order proportional-integral (FOPI) speed regulator. Available tuning guidelines to design the FOPI speed regulator for a DC motor drive system are also presented. Two closed loop speed control strategies, namely DC motor armature voltage control and armatu...

Large currents are injected into the earth from grounding poles of HVDC systems under monopole ground return mode. The currents change the earth surface potential and result in DC currents in AC systems. This paper proposes a computationally efficient decoupled circuital calculation method for assessing the unwanted DC currents in AC grids. Firstly...

This paper proposes a two-stage universal adaptive stabilizer (UAS)-based optimization technique for an accurate and efficient estimation of Li-ion battery model parameters. The first stage utilizes an UAS-based adaptive parameters estimation (APE) technique to acquire an initial estimate of battery model parameters. The second stage utilizes one o...

Linear proportional–integral (PI) controllers are an attractive choice for controlling the speed of induction machines because of their simplicity and ease of implementation. Fractional-order PI (FO–PI) controllers, however, perform better than PI controllers because of their nonlinear nature and the underlying iso-damping property of fractional-or...

Estimation of Lithium-ion (Li-ion) battery model parameters is key for accurately determining battery state of charge (SOC). Estimating these parameters requires substantial experimental effort. This work reduces the experimentation required, by using universal adaptive stabilization (UAS) for estimating parameters appearing in battery model state...

This paper presents a detailed investigation of audible noise characterization of filter capacitors by investigating the noise radiation characteristics and analyzing the effect of voltage frequency, phase angle, and magnitude on a single capacitor unit. Firstly, the noise radiation for capacitor surfaces was characterized theoretically using finit...

This work presents a novel technique for Li-ion battery model parameters estimation using a high-gain adaptive observer. The resultant battery model is then used to estimate the state of charge of the battery. A periodic update of the estimated battery model parameters also helps in identifying battery's state of health and predict the battery life...

This paper proposes the Primary Differential Pulse Method (PDPM) for the live partial discharge detection of oilimmersed inverted current transformers (OIICTs). The PDPM is based on the differential current measurements that are taken at the high voltage side of the current transformer under test. The proposed technique overcomes the problem of int...

This paper evaluates different types of AC machines and various control techniques for their suitability for the drive system of Alternative Energy Vehicles (AEV). An Indirect Field Oriented (IFO) drive system for the AEV application is chosen and its major problem of detuning is addressed by designing an offline and an online rotor resistance adap...

This paper focuses on high speed control of traction drive system for the Alternative Energy Vehicle (AEV). A hybrid approach is suggested in which a Sine Triangle Pulse Width Modulated (SPWM) inverter is used below the base speed and a square wave inverter is opted above the base speed. The transition between the SPWM and square wave is realized i...

This paper designs a hybrid speed controller in which a Sine Triangle Pulse Width Modulated (SPWM) inverter is used below the base speed and a square wave inverter is employed above the base speed. The two inversion techniques complement each other for their advantages and disadvantages below and above the base speed. This paper proposes a unique s...

Square wave inverters are the most feasible choice for high speed and high power applications. However, for a square wave inverter, the harmonics problem becomes more severe specifically, at the lower frequencies below the base speed, where the harmonics current is increased which significantly decreases the machine efficiency. Another problem with...

This paper presents a field oriented induction motor drive system with two distinct features: a Fuzzy Model Reference Learning Controller (FMRLC) to improve the robustness of the speed regulator against the external disturbance and a closed loop Sliding Mode Flux and Speed Estimator (SMFSE) to estimate the flux and speed of machine. The FMRLC based...

An Indirect Field Oriented (IFO) induction motor is one of the most commonly used drive system for the alternative energy vehicles. The variation in the rotor time constant due to change in the motor temperature so called the detuning is one of the major problem for such a drive system. This paper proposes an offline and an online technique and com...

The design skills in engineering students can be best achieved using an integrated learning approach which consists of structured, guided, and open-ended design experiences. This paper presents a description of the guided design experience in terms of main objectives, implementation mechanisms, and assessed outcomes as applied to courses in the are...

Indirect field-oriented control, direct field- oriented control, and direct torque control are the most widely used instantaneous torque control techniques for the drive system of alternative energy vehicles (AEVs). This paper evaluates three candidate alternating-current machines and investigates the suitability of different control techniques for...

This paper presents a single input fuzzy controller (SFLC) for adjusting the duty cycle of a photovoltaic (PV) charger to extract the maximum power out of a PV panel. The algorithm is based on maximum power point tracking (MPPT) and is compared with two conventional MPPT techniques, namely the Hill climbing method and the two input fuzzy controller...

This paper presents the design, development and implementation of a cascaded boost converter for its application in 300 watts stand alone solar energy system. The converter will be used to boost the 24 volt DC battery voltage to 384 volts output level using a single switch in a geometric approach. The pros and cons of this topology are compared wit...

This paper proposes an integrated approach for developing the engineering curricula with a specific focus on engineering design. The proposed approach allows a continuous and coherent development of engineering students' design skills throughout the entire undergraduate curriculum. This ongoing design experience is delivered at an involvement and c...

The fact that the drive system of an electric vehicle (EV) and hybrid electric vehicle (HEV) is powered by the battery and cooled by car coolant increases the importance of machine operation at an optimal operating point both with respect to efficiency and thermal considerations. This paper investigates the temperature effect on the machine's perfo...

This paper presents a direct field-oriented induction motor drive system with two distinct features: a sliding mode voltage mode flux observer (SMVMFO) and a fuzzy model reference learning controller (FMRLC). The speed of the induction motor is regulated using an FMRLC, which does not require rigorous tuning of the controller's parameters. The roto...

This paper designs and implements an electromechanical propulsion system for a 42-V battery-sourced integrated starter-alternator (ISA) using an indirect-field-oriented (IFO) controller with a speed sensor on the shaft of the machine. The design aspects of the ISA energy conversion system are discussed, with emphasis on the motor selection and comp...

The decoupled control of torque and flux has made field oriented control an attractive choice for high performance induction motor drives. However, changes in the speed tracking trajectory and external disturbances make it difficult to achieve an acceptable closed-loop tracking performance, especially when traditional linear controllers are used. T...

The decoupled control of torque and flux has made field oriented control an attractive choice for high performance induction motor drives. However, changes in the speed tracking trajectory and external disturbances make it difficult to achieve an acceptable closed-loop tracking performance, especially when traditional linear controllers are used. T...

Development of design skills in engineering students at United Arab Emirates University is achieved using an integrated learning approach which consists of structured, guided, and open-ended design experiences. This paper presents a description of the structured design experience in terms of main objectives, implementation mechanisms, and assessed...

This paper addresses intelligent communication among device entities to solve two issues in a distributed industrial control environment: Network related bottlenecks; and intelligent control in the presence of real time requirements. This work attempts to address customized design, development and implementation aspects of the Distributed Control S...

In this paper, the customized design, development and implementation aspects of the Distributed Control System (DCS) have been focused in an environment of intelligent field devices and Programmable Logic Controllers (PLC’s). The proposed architecture consists of two layer approach: use of decentralized intelligent agents at the local process level...

This paper presents a direct field oriented (DFO) induction motor drive system with two distinct features. First, the speed regulation of the proposed drive system is achieved by using a fuzzy model reference learning controller (FMRLC), which is more robust and does not require rigorous tuning because of its adaptive nature as compared to the prop...

This paper focuses on a method for achieving robust direct field orientation control of an induction machine using a closed-loop voltage model flux observer that is insensitive to stator resistance variation and does not require voltage signal information, thereby eliminating the need for a voltage sensor. In contrast, the conventional voltage mode...

A closed-loop torque controlled induction motor drive system is presented which can function as a controllable source of torque with a fast dynamic response and thus it can achieve an adequate control performance. The proposed drive system includes an accurate and robust flux and torque estimator and a direct fuzzy controller to enhance the torque...

The voltage model flux observer can accurately estimate the stator flux when operating at high speed. However, at low speed this estimation is highly sensitive to the stator resistance variation. Also the observer needs voltage sensors for actual voltage measurements and becomes less accurate if command voltages are used, especially beyond the line...

A new closed loop current model flux observer is designed to estimate the rotor flux, position and velocity of an induction machine. The current observer includes carefully designed sliding mode functions which are derivative of the fluxes along the α and β axes. Therefore, when the estimated current converges to the measured one, the flux estimati...

In this letter, a new sliding-mode-sensorless control algorithm is proposed for the field-oriented induction machine drive. In the proposed algorithm, the terms containing flux, speed, and rotor time constant, which are common in both current and flux equations, in the current model of the induction machine are estimated by a sliding function. The...

Stator flux estimation using the voltage model flux observer requires voltage sensors and is highly sensitive to the stator resistance variation, especially at low speed. This paper designs a new sliding mode voltage model flux observer (SMVMFO). This closed loop SMVMFO is based on the current estimation error and the sliding mode functions are der...

In this paper, a new sliding mode flux and speed observer is proposed. The flux observer accuracy is guaranteed through the current observer. The error between the actual current and observed current converges to zero which guarantees the accuracy of the flux observer. The rotor speed is estimated by the observer based on the measured and estimated...

This paper presents flux and speed estimation with on-line rotor time constant estimation for an indirect field oriented induction motor drive system using sliding mode technique. A closed loop flux observer based on the current estimation error is constructed. A unique feature of the proposed observer is that, the proposed current observer include...

An adaptive parallel distributed compensator (APDC) using Takagi-Sugeno fuzzy systems for indirect field oriented (IFO) induction machines is proposed. An on-line method is used to adjust the parameters of a Takagi-Sugeno identifier model to match the behavior of IFO induction machine drive system. Then, using the certainty equivalence principle, t...

This paper presents a current model rotor flux observer based model reference adaptive control system (MRAS) scheme. The proposed MRAS scheme provides an attractive mean for achieving the rotor resistance adaptation for an indirect field oriented (IFO) induction motor drive system. The desired value of the rotor flux along the q-axis should ideally...

Direct field orientation (DFO) control for an induction machine is designed and implemented using a new sliding mode technique based current model flux observer. A closed loop flux observer, based on the current estimate error is constructed. The flux and current observers include a sliding function, which is derivative of the flux. Therefore, when...

In this study, a new sliding mode current observer is proposed for the flux and speed estimation of an induction machine. The flux estimation accuracy is guaranteed through the current observer, i.e. the error between the actual current and observed current converges to zero which guarantees the accuracy of the flux estimation. The rotor speed is t...

This paper presents an advanced controller for electric machines (ACE) developed at the Ford Research Laboratory to meet the demanding needs of application and algorithm development. It is based on the TMS320C31 floating point DSP and Motorola 68F333 microcontroller. The focus has been in the electric machine research area, principally for hybrid,...

In this paper a new sliding mode flux and speed observer is proposed for induction machine drive systems. The error between the actual and observed currents converges to zero which guarantees the accuracy of the flux observer. The rotor speed and the rotor time constant are estimated based on the estimated stator currents and rotor flux. The estima...

This paper has attempted to improve the speed control performance of an indirect field oriented (IFO) induction motor drive system by using a continuous sliding mode controller. The proposed continuous sliding mode controller is robust to load changes and system disturbances which are unique features of discontinuous sliding mode control. Also it i...

A Fuzzy Logic Controller (FLC), with a Dynamically Focussed Learning (DFL) algorithm is proposed, developed and implemented to improve the performance of an induction motor drive system. In standard direct fuzzy controller, utilization of the rule-base is mostly poor, especially when error input gets smaller and the control action is produced by on...

Recently, Visteon has developed an Integrated Starter-Alternator (V-ISA) system. A prototype vehicle was built to gain the initial data on the starting power needed for a rapid and frequent engine start-stops, the feature that that does not deter driver's comfort yet enables substantial fuel saving and emission reduction. The test results are prese...

The drive system for the Visteon Integrated Starter-Alternator (VISA), which uses ultracapacitors as the main power source, is developed and demonstrated. VISA system controller integration with the engine and induction motor controllers is presented. The controller parameters are identified and tuned for both the motoring and generation mode of op...

This paper presents the design, development and implementation of the Visteon Integrated Starter-Alternator (VISA) system. The unique aspect of the vehicle's power system is that it utilizes the 300 volt ultracapacitors energy storage system, which is smaller and lighter than the 300 volt battery source. The under-hood engine package retains the si...