Wyniki wyszukiwania - BazTech

1

Gravitational search optimization approach to improve fuzzy logic speed controller for induction motor drive

Ali J. A., Hannan M. A., Mohamed A.

Przegląd Elektrotechniczny

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2016

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R. 92, nr 8

200--205

EN

Fuzzy logic controller (FLC) is very useful for controlling speed and torque variables in the three-phase induction motor (TIM) operation. However, the conventional FLC has the exhaustive traditional trial and error procedure in obtaining membership functions (MFs). This paper presents an adaptive FLC design technique for TIM using a gravitational search algorithm (GSA) optimization technique. This technique provides the numerical values to limit the error and change in error of the MFs based on the evaluation results of the objective function formulated by the GSA. The root mean square error (RMSE) of the speed response is used as a fitness function. An optimal GSA- based FLC (GSAF) fitness function is also employed to tune and minimize the RMSE for improving the performance of the TIM in terms of changes speed and torque. Space vector pulse width modulation (SVPWM) technique is utilized to generate signals via voltage/frequency control strategy for variable frequency inverter. Results obtained from the GSAF are compared with those obtained through particle swarm optimization (PSO) to validate the developed controller. The robustness of the GSAF is better than that of the PSO controller in all tested cases in terms of damping capability and transient response under different load and speed.

PL

W artykule zaprezentowano adaptacyjny sterownik typu fuzzy logic przeznaczony do trójfazowego silnika indukcyjnego wykorzystujący algorytm optymalizacyjny badania grawitacyjnego. Jako funkcję fitness użyto błąd rms odpowiedzi prędkości. Do zasilania silnika wykorzystano metodę modulacji szerokości impulsu.

2

Rule-based Fuzzy and V/f Control for Induction Motor Speed Responses Using SVPWM Switching Technique

Ali J. A, Hannan M. A., Mohamed A.

Przegląd Elektrotechniczny

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2015

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R. 91, nr 3

133-136

EN

This paper describes the development of a three-phase induction motor (TIM) drive speed controller. A rule-based fuzzy logic controller (FLC) is developed for TIM speed control in non-linear systems. Speed control applications are tested by conducting simulations under different operating conditions. To achieve reliable TIM operation, the space vector pulse width modulation (SVPWM) scheme is used to generate gate signals for the three-phase, two-level inverter. The SVPWM technique demonstrates excellent performance in TIM speed control. The scalar control (V/f control), which is inexpensive, simple to implement in hardware, and applicable to medium- and high-speed rated TIM applications, is used to control the developed TIM. Results show that the implementation of rule-based fuzzy with V/f control and the SVPWM technique for TIM speed control provides superior performance, which is sufficiently robust and intelligent for real-time applications.

PL

Opisano nową metodę sterowania prędkością trójfazowego silnika indukcyjnego. Wykorzystano sterownik bazujący na logice rozmytej umożliwiający sterowanie w systemach nieliniowych. Do bramkowania sygnału dwupoziomowego przekształtnika wykorzystano wektorowa modulację szerokości impulsu SVPWM. Zastosowano też skalarny przetwornik V/f.

3

Real Time Prototype to Measure Structural Acceleration and Tilt of High-Rise Building

Haque M. E, Zain M. F. M, Hannan M. A., Jamil M., Asikuzzaman M

Przegląd Elektrotechniczny

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2015

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R. 91, nr 2

177-182

EN

Smart sensor is the new invention applying to detect the damage of the high-rise civil building structural health. Sensor technology offers new opportunities to advance monitoring for civil large building infrastructure health and maintenance by providing relevant information regarding the condition of high-rise building structural strength at a light price and greater bulk than traditional monitoring tactics. The aim of this article is to validate the MEMS accelerometer sensor to measure vibration and tilt of the high-rise civil building infrastructures. The experimental result shows that the propose prototype has been successfully measured high-rise building vibration and tilt sensing information.

PL

W artykule opisano możliwości zastosowania czujników przyśpieszenia typu MEMS do pomiaru wibracji i odchylenia konstrukcji budynków. Przedstawione wyniki badań eksperymentalnych potwierdzają przydatność tych czujników szczególnie w sytuacjach dużych zagrożeń.

4

Power Amplifier Frequency Controller Using feedback control techniques for Bio-implanted Devices

Hussein H. A., Hannan M. A., Mutashar S., Samad S. A., Mikdad A.

Przegląd Elektrotechniczny

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2015

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R. 91, nr 12

34-37

EN

Switch mode power amplifier is used in biomedical devices widely. The power amplifier supplies the required operating power to the implanted devices. Zero voltage switching (ZVS) operation of class-E power amplifier leads to convert DC voltage to AC with high efficiency and workings frequency. Frequency has a great function in powering most of the biomedical implanted devices. Frequency shift caused by inductors and capacitors used in the circuit can cause load variation or changing in mutual displacement or they may lead to instability and data loss of the implanted devices. So switching-mode frequency control is the key problem in the biomedical device powering system. This paper focused on the design of a frequency controlled power amplifier to improve the controller’s efficiency in terms of speed and better results. The objective of this work is to control the operating frequency. Feedback control method is used by using proportional integral derivative controller (PID), proportional integral (PI) and voltage controlled oscillator (VCO) to reduce the phase shift and settling time. The Bode plot and Nyquist stability criterion analyses show that the developed power amplifier frequency controller is stable and perform well to improve the controller efficiency.

PL

W artykule opisano wzmacniacz mocy używany w technice bio-implantów. Wzmacniacz klasy E z operacją ZVS przekształca stałe napięcie na napięcia AC. Kontrola częstotliwości tego napięcia ma ważne znaczenie ponieważ częstotliwość może się zmieniać przy obecności elementów L, C w układzie. W pracy opisano metode kontroli częstotliwości tego napięcia.

5

Managing the Distributed Generation Units in a Microgrid using a Fuzzy-PI Controller

Salam A. A., Mohamed A., Hannan M. A., Shareef H.

Przegląd Elektrotechniczny

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2015

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R. 91, nr 10

148-153

EN

A power distribution system with distributed generations can operate as a microgrid under specific conditions. A microgrid can be operated under grid-connected and islanded modes seamlessly without disrupting the loads within the microgrid. This study analyzes the intelligent control of a microgrid with a pulse-width modulation-controlled voltage source inverter. Switching patterns are generated through a fuzzy proportional-integral (PI) controller. This study aims to develop a fuzzy-PI controller and compare its performance with that of a PI controller in controlling the voltage and frequency of a microgrid under disturbances in a Matlab/Simulink environment. Results show that the fuzzy-PI controller has higher capability, precision, and robustness than the PI controller in quickly restoring and stabilizing the microgrid. A simulation experiment is also performed to verify the greater validity and effectiveness of the microgrid equipped with the fuzzy-PI controller than with the PI controller. The developed fuzzy-PI controller can reduce the total harmonic distortion by 0.46%.

PL

W artykule analizowano inteligentne sterowanie mikrosiecią z wykorzystaniem przekształtnika sterowanego metodą modulacji szerokości impulsu. Jako sterownik wykorzystano proporcjonalno całkujący układ z logika rozmytą. Zbadano pracę układu w sieci z zakłóceniami. Stwierdzono znaczące przewagi kontrolera pracującego z logika rozmytą w porównaniu do układów konwencjonalnvch.

6

Comparative Survey on Traffic Sign Detection and Recognition: a Review

Wali S. B., Hannan M. A., Hussain A., Samad S. A.

Przegląd Elektrotechniczny

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2015

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R. 91, nr 12

38-42

EN

Developing real-time Advanced Driver Assistance Systems (ADAS) based on video aiming to extract reliable vehicle state information has attracted a lot of attention during the past decades. This ADAS system includes inter-vehicle communication, driver behavioral monitoring, and human-machine interactions. In these systems, robust and reliable traffic sign detection and recognition (TSDR) technique is a critical step for ensuring vehicle safety. This paper provides a comprehensive survey on traffic sign detection and recognition system based on image and video data. Our main focus is to present the current trends and challenges in the field of developing an efficient TSDR system followed by a detail comparative study between different renowned methods used by various researchers. Finally, conclusion followed by some future suggestion is provided to develop an efficient TSDR system is provided. This survey will hopefully lead to develop an effective traffic sign detection and recognition system which will ensure driver safety in future.

PL

System ADAS (Advanced Driver Assistance System) obejmuje także metody rozpoznawania znaków drogowych. W artykule przedstawiono przegląd metod detekcji i rozpoznawania znaków drogowych bazujących na obrazie video. W artykule dokonano oceny istniejących metod oraz zaproponowano środki poprawy ich efektywności.

7

Traffic Sign Classification based on Neural Network for Advance Driver Assistance System

Hannan M. A., Wali S. B., Pin T. J., Hussain A., Samad S. A.

Przegląd Elektrotechniczny

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2014

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R. 90, nr 11

169--172

EN

Traffic sign is utmost important information or rule in transportation. In order to ensure the transportation safety the automotive industry has developed Advance Driver Assistance System (ADAS). Among the ADAS system, development of TSDR is the most challenging to the researchers and developers due to unsatisfying performance. This paper deals with, automatic traffic sign classification and reduces the effect of illumination and variable lighting over the classification scheme by using neural network according to the traffic sign shape. There are three main phase of the classification scheme such as; pre-processing using image normalization, feature extraction using color information of 16-point pixel values and multilayer feed forward neural network for classification. An accuracy rate of 84.4% has been achieved by the proposed system. Overall processing time of 0.134s shows the system is a fast system and real-time application.

PL

W artykule opisano metodę automatycznego rozpoznawania I klasyfikacji znaków drogowych z przenaczeniem do inteligentnych systemów wspomagania kierowcy ADAS. Do tego celu wykorzystano sieci neuronowe przeprowadzając normalizację obrazu, ekstrakcję cech i klasyfikację. Osiągnieto dokładność rozpoznawania rzędu 84% przy przeciętnym czasie rozpoznawania około 0.13 s.

8

Renewable Energy Technologies and Hybrid Electric Vehicle Challenges

Azidin F. A., Hannan M. A., Mohamed A.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 8

150--156

EN

This paper introduces the utilization of selected renewable energy technologies such as solar cell, battery, proton exchange membrane (PEM) fuel cell (FC) and super-capacitors (SCs) in the electrical vehicle industry. Combination of multiple energy resources is imperative to balance the different characteristic of each resource. Concomitantly, the need of an efficient energy management system arises within the industry. Thus, existing system from past and present undergoing research papers are summarized to give a compact overview on the technology and know-how technique to readers.

PL

W artykule zaprezentowano wykorzystanie różnych źródeł energii odnawialnej – baterii słonecznych, baterii z protonową membraną i superkondensatorów w przemyśle motoryzacyjnym. Rozważano możliwość stosowania równocześnie różnych źródeł w celu zrównoważenia ich charakterystyk.

9

Lane Departure Detection and Transmisson using Hough Transform Method

Habib S., Hannan M.A.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 5

141-146

EN

Vehicles need to be re-advancing by video transmission among vehicles for safety and cooperative deriving. The video images captured from camera could help the driver to monitor the surroundings as well as transmit the compressed images over vehicular communication network. Video over wireless communication has a lot of potential applications in intelligent transportation systems (ITS).Video streaming utilizes high bandwidth data links to transmit information. The high-bandwidth systems required larger equipment, better line-of-sight, and more complex mechanism for reliable transmit ion over the network. The intended platform for the system described in this study, is to develop a software defined algorithm for automatic video compression and transmission. The proposed algorithm is able to robustly find the left and right boundary of the lane using Hough Transform method and transmit over the network. Therefore the limitations of high-bandwidth equipment become more significant in a tactical scenario. The results show that the proposed method works well on marked roads and transmission in various lighting conditions.

PL

W artykule przedstawiono algorytm kompresji i transmisji obrazów do zastosowania w komunikacji bezprzewodowej w sieci samochodowej. Przy pomocy transformacji Hough algorytm określa lewą i prawą granicę pasa i przesyła dane do sieci. Przeprowadzono badania weryfikujące działanie algorytmu, które wykazały jego skuteczność na oznaczonych drogach przy różnych warunkach oświetlenia.

10

Efficient Low-Power Recovery Circuits for Bio-implanted Micro-Sensors

Mutashar S., Hannan M. A.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 5

15-18

EN

This paper presents a modified sub-electronic circuit with low-power recovery circuits to be implemented in implanted micro-sensor used to stimulate the human and animals’ nerves and muscles. The system based on ASK modulation techniques operated with 13.56 MHz according to industrial, scientific, medical (ISM). The modulation index is 12.6% to achieve minimum power consumption to avoid the tissue heating. The system consists of external part with modified class-E power amplifier efficiency 87.2%, and internal part consists of a voltage doubling rectifier with selfthreshold cancellation and efficient low-dropout voltage regulator based on series NMOST transistor using 0.35 μm technology to offer very stable 1.8 DC V. The produced voltage used to power the sub-electronic implanted device with steady voltage even in any changing with the implanted load resistance. The mathematical model is given. The design is simulated using OrCAD PSpice 16.2 software tools and for real-time simulation, the electronic workbench MULISIM 11 has been used to simulate the class-E power amplifier.

PL

W artykule przedstawiono zmodyfikowany układ pół-elektroniczny do zastosowania w implantowych mikro-czujnikach stymulujących pracę ludzkich i zwierzęcych nerwów i mięśni. Urządzenie posiada obwód odzyskiwania mocy w przypadku obniżonego zasilania w układzie. W proponowanym rozwiązaniu zastosowano modulację ASK o częstotliwości 13.56MHz i indeksie 12.6% w celu minimalizacji zużycia energii. Przedstawiono także model matematyczny urządzenia. Badania symulacyjne przeprowadzono w środowisku OrCAD PSpice 16.2 oraz MULISIM 11 do symulacji w czasie rzeczywistym wzmacniacza mocy klasy E.

11

Light Vehicle Energy Management System using Multi-Power Sources

Hannan M. A., Azidin F. A., Mohamed A.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 3b

197-204

EN

This paper describes the modelling of the energy management system (EMS) of light vehicles using hybrid multi-power source systems. The hybrid system included a fuel cell (FC), a battery, supercapacitors (SC) and a photovoltaic cell. The battery was used as the primary power source for driving the vehicle. Other sources were used as supplemental power sources for medium range vehicle usage. The control algorithm was developed as a switching mechanism used to trigger between the energy sources based on the drive of the vehicle power system as a means of examining the electrical power flow. The control algorithm was used to manage the switching operation of power supplies for the EMS during light vehicle operation. The results showed that the models were operating efficiently based on the switching control algorithm and management of the energies from various sources.

PL

Opisano modelowaniem system zarządzania energią lekkich pojazdów. W skład systemu wchodzą: bateria, superkondensator i bateria fotowoltaiczna. Szczególną uwagę zwrócono na mechanizm przełączania między źródłami energii.

12

Investigation of Three-Phase Grid-Connected Inverter for Photovoltaic Application

Ghani Z. A., Hannan M. A., Mohamed A.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 7a

8-13

EN

This paper describes the investigation of the grid-connected three-phase inverter for photovoltaic (PV) application. The inverter control system modeling is carried out in MATLAB/SIMULINK environment. With the aids of the proportional-integral controllers, sinusoidal pulse-width modulation (SPWM) control technique and Park transformation, the inverter control system managed to convert PV power to ac power, stabilize the output voltage and current, and feeds the excess power to the utility grid. The control system generates the PWM signals for power devices, the insulated gate bipolar transistors in order to regulate the output voltage and current. In addition, the system is simulated with the PV simulator in order to facilitate the real PV power that to be fed to the input of the inverter. The control system produced 2.48% and 4.64% of output voltage and current total harmonic distortion, respectively. The simulation results such as the ac output voltages and currents, inverter system power flow, and grid disturbances detection signals, proved the effectiveness of the developed control algorithm. For the validation, this model is to be linked to the inverter prototype by utilizing the dSPACE controller.

PL

W artykule badano trójfazowy przekształtnik w zastosowaniu do urządzeń fotowoltaicznych podłączonych do sieci. Układ składa się ze sterownika PI, układu modulacji SPWM i transformacji Parka i umożliwia konwersję napięcia z systemu fotowoltaicznego do sieci ac, stabilizację napięcia i prądu.

13

Harmonics and thermal characteristics of low wattage LED lamps

Uddin S., Shareef H., Mohamed A., Hannan M.A.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 11a

266-271

EN

This paper presents harmonics and thermal characteristic of Light Emitting Diode (LEDs) Lamps which are used in residential and commercial applications as energy efficient lighting bulbs. It is done by performing experimental tests on various LED lamps available in the market. The current drawn by several LED lamps are first measured to investigate the electrical characteristics. These measurements provide current harmonic characteristic of individual lamps. Then various configurations of LEDs were connected to a laboratory scale feeder to analyze the diversity factors. Furthermore, heat generation levels of the tested LED lamps are investigated to measure the thermal characteristics of LED lamps. The results show that individual LED bulbs produce considerable amount of harmonics but it could be reduced by combining various types of LED bulbs. Furthermore, the diversity factor could be improved if LED lamps are mixture with Compact Fluorescent Lamps (CFLs). Results also shows that the thermal characteristic of LED lamps is much better compare to the performance of CFLs.

PL

W artykule przedstawiono analizę harmonicznych oraz charakterystyki termiczne żarówek z diodami LED, stosowanymi komercyjnie w lampach. Badania przeprowadzono na losowo wybranych lampach dostępnych na rynku. Wskazano rozwiązania mogące zredukować ilość generowanych harmonicznych.

14

Effect of DC Capacitor Size on D-STATCOM Voltage Regulation Performance Evaluation

Hannan M. A.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 12a

243-246

EN

This paper describes the modelling and simulation of distribution static compensator (D-STATCOM) focused with effect of DC capacitor size and voltage regulation. Different capacitor values have been investigated to reduce the load ripple voltage during the charging and discharging of the capacitor. The optimum capacitor valuse has been determined to obtained the lowest ripple voltage within the rage of 8%. Capacitive and inductive mode of D-STATCOM operation have been also investigated and obtained results proved that the capability of the D-STATCOM in regulating the system voltage is near to the rated value of 1.0 p.u.

PL

W artykule przedstawiono sposób budowy modelu i symulacje kompensatora pasywnego D-STATCOM, ze naciskiem na analizę wpływu pojemności kondensatorów oraz regulacji napięcia na jego działanie. Badania wykonano dla różnych pojemności i wyznaczono optymalną, zapewniającą najmniejsze wahania napięcia (w zakresie 8%). Analizie poddano działanie kompensatora przy charakterze pojemnościowym i indukcyjnym.

15

D-STATCOM Pulse Selection and Transformer Configuration for Harmonic Elimination

Hannan M.A.

Przegląd Elektrotechniczny

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2012

|

R. 88, nr 11a

210-213

EN

The sensitive industrial loads and critical commercial operations suffer from harmonics problems which can cost significant loss per incident based on process down-time, loss production, idle work forces and other factors. To overcome such problems, utility companies have made efforts to improve the quality and reliability of their electric power by introducing distribution static compensator (D-STATCOM). However, up to now, many research are going on D-STATCOM control scheme, suitable pulse and transformer design, dc capacitance effect and involvement with many power quality problems. This paper deals with the modelling and simulations of D-STATCOM model focus with the pulse selection, transformer design configuration and test distribution system. The issue of harmonics in the D-STATCOM is addressed by considering a 24-pulse so as to eliminate the generated harmonics. The harmonics eliminating performance of the D-STATCOM in 12-pulse, 24-pulse and 48-pulse are also investigated.

PL

W artykule opisano budowę modelu i symulacje kompensatora statycznego D-STATCOM. Przedstawiono zagadnienie liczby pulsów, konfiguracji transformatora oraz przeprowadzono testy systemu energetycznego. Analizie poddano zagadnienie eliminacji wyższych harmonicznych w układach 12-, 24- oraz 48-pulsowym.

16

A review of the integration of Energy Storage Systems (ESS) for utility grid support

Daud M. Z., Mohamed A., Hannan M. A.

Przegląd Elektrotechniczny

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2012

|

R. 88, nr 10a

185-191

EN

Energy storage systems (ESS) have recently become an indispensable solution to many operational issues related to the integration of distributed generation (DG) technologies in electricity grids. Most of the applications are in the form of power quality mitigation and management of the energies between DG and electricity grids. This paper presents a review of the present status of worldwide applications and recent research on ESS. Of particular interest is the deployment of battery energy storage system (BESS) technologies for utility grid support and the approaches used in power system simulation studies. BESS steady state and dynamic modelling methods are also discussed.

PL

W artykule zaprezentowano przegląd stanu wiedzy na temat zastosowań i badań układów magazynowania energii ESS. Szczególną uwagę zwrócono na układy z ogniwami w zastosowaniu jako element zintegrowanej sieci. (Zintegrowane systemy magazynowania energii – przegląd stanu wiedzy)