Electrical Engineering Research Papers/Topics

Construction And Test Of A Delta Modulated Buck Type 3 Phase Converter

ABSTRACT A Delta Modulated, Buck Type, Three Phase PWM Converter was constructed and tested. The converter is of the current source type and can be used in conjunction with current source inverters. The d.c. current is regulated by proportional feedback control loop. By delta modulation of the voltages across the a.c. terminaIs of the converter, the a.c. source currents are "indirectly" controlled so that the fundamental components remain in a predefined phase with respect to the source volt...

Design Of Digital Filters Using Incremental Changes In Processing

ABSTRACT   Procedures are developed for designing high-speed, modular digital filters. The techniques presented  here are based on the use of differences in the data signal in processing. The use of one-bit word, and the use of mapping of differentials in processing to produce a multiplication free, fast, and modular structured digital filters is considered in details in this thesis. A new algorithm for the digital filter is also proposed in the thesis which leads to the possibility of usi...

Design Of Adaptive Control Schemes For An Industrial Robot Arm

ABSTRACT This study has investigated the techniques for motion control of industrial robots with an application in which the robotics end-effector is required to track prescribed paths under conditions of changing payload masses, friction and elasticity in the gear boxes. In particular, the minimal configuration (the first three degrees-of-freedom) necessary for positioning the end-effector of a revolute industrial robot arm, MIMO, has been studied in terms of kinematics, dynamics and control...

Correlation Of Load-Point Reliability Indices With Power System Fault Levels

ABSTRACT Extensive literature abounds on the evaluating techniques of load-point reliability indices of electrical power systems. On the whole, all the efforts of the published works have been the establishment of conventional methods to evaluate load-point reliability indices from raw component reliability data. Any system change that warrants new set of load-point reliability indices would require the whole process of reliability evaluation to be repeated. That is an inherent characteristic...

Dynamic Modelling And Implementation Of Split-Phase Induction Machine

ABSTRACT Multiphase induction machine offers numerous advantages compared to the conventional three phase induction machine. It is an upgrade from the conventional three phase induction machine. By splitting the phase belt of a three phase, a sixphase machine is realised. The areas of application of multiphase machines are enormous, mostly where reliability is paramount. This research presents the modelling and implementation of a split phase induction machine with Saturation and skin effects...

Synthesis Of A Hysteresis Motor

ABSTRACT This work presents the synthesis of a motor with hysteresis motor torque-speed characteristic. The machine is synthesized from a conventional squirrel cage induction motor (SCIM) with high rotor resistance to leakage reactance ratio and a polyphase transfer field (TF) reluctance effect machine with an inverted torque-speed characteristics about the speed axis. Both motors are mechanically coupled and are connected in parallel to the supply. It is shown that the resultant torque which...

The Role Of Technicians And Craftsmen In A Developing Country

ABSTRACT On the 27th June, 1995, the Engineering professionals, policy makers , representatives from various sectors and the Hon. Minister of Works and Housing - Major General Abdukarim Adisa gathered here to witness the launching of the NIGERIAN ASSOCIATION OF ENGINEERING CRAFTSMEN (NAEC). An Association that  into existence in 1993 after the amended Decree 55/70 by 27/92 which empowered COREN to regulate engineering profession in Nigeria.

Investigation And Simulation Of A Micro Hydro, Solar And Biomas Hybrid Energy System For Off-grid Locations In Nigeria

ABSTRACT  Isolated or Stand-alone power systems with the use of renewable energy sources have become cost-effective and a convenient option for areas where grid connection is neither available nor feasible. A hybrid combination of Renewable Energy Technologies (RETs) is considered to be the best suited alternative to an expensive grid extension for remote areas around the world. This research focuses on creating a model for electricity generation from a mix of renewable resources (hydro, sol...

Efficient Spectrum-Handoff Schemes For Cognitive Radio Networks

Abstract Radio spectrum access is important for terrestrial wireless networks, commercial earth observations and terrestrial radio astronomy observations. The services offered by terrestrial wireless networks, commercial earth observations and terrestrial radio astronomy observations have evolved due to technological advances. They are expected to meet increasing users’ demands which will require more spectrum. The increasing demand for high throughput by users necessitates allocating addit...

Evaluating The Performance of The Unified Power Flow Controller (UPFC) on Fault Current Limitation in The Nigerian 330kV Power Network

ABSTRACT This work focused on Evaluating the Performance of the Unified Power Flow Controller (UPFC) on Fault Current Limitation in the Nigerian 330kV Power Network. The SIMULINK model of the Nigerian 330kV system was developed. The model of the UPFC was developed and integrated into the power system model. The proportional integral (PI) control parameters of the UPFC was optimized using genetic algorithm. Results from simulation carried out showed the versatility of the UPFC in the protecti...

Sliding Mode Direct Torque Control of Three Phase Induction Machine Applicable in Electric Vehicles

Abstract The electric vehicle relies on electric motors for propulsion. In this report, the case was made for the induction motor as a suitable candidate for this tractive application. Being able to control the electric motor invariably implies efficient control of the vehicle. This work reports the six-step operation of the constant volts/hertz (V/f) control technique for voltage fed induction motor drives. Mathematical equations supporting the principle is discussed and the drive is modell...

Modeling Modelingand Parameter Extraction of a and Parameter Extraction of a 214 MVA Turbo- 214 MVA Turbo-generator driven by DC generator driven by DC Motors during Off- Motors during Off-li

Abstract This thesis aims to extract d-axis machine parameters of a 214 MVA high-speed turbogenerator using well-established offline techniques. MATLAB/SIMULINK tool has been utilized to model the generator and perform sudden short-circuit (SSC) tests. Because constant speed operation of the generator is vital consideration for the accuracy of SSC tests for parameter extraction, this thesis has employed an arrangement of 2 DC motors operating alongside a drive system, which is configured to ...

A Hybrid Modulation Scheme For Cascaded H-Bridge Inverter Cells

ABSTRACT This work proposes a switching technique for cascaded H-Bridge (CHB) cells. A single carrier Sinusoidal PWM (SCSPWM) scheme is employed in the generation of the gating signals. A sequential switching and base PWM circulation schemes are presented for this fundamental cascaded multilevel inverter topology. With these proposed concepts, it is now possible to generate equal average switching signal patterns in all the constituting power semiconductor switches. This results in equal swi...

Dynamic Analysis Of Induction Machine Connected To Infinite Bus-Bar

ABSTRACT    The dynamic simulation is one of the key steps in the validation of the design process of the motor drive systems and it is needed for eliminating inadvertent design mistakes and the resulting error in the prototype construction and testing. A quality mathematical model of induction machine based on the dynamic equations and D-Q transformation technique is presented in rotor reference frame and a computer simulation of a 7.5kW three phase induction motor  was carried out based�...


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