oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
State of the Art of Switched Reluctance Generator  [PDF]
Amissa Arifin, Ibrahim Al-Bahadly, Subhas Chandra Mukhopadhyay
Energy and Power Engineering (EPE) , 2012, DOI: 10.4236/epe.2012.46059
Abstract: This paper provides a comprehensive review of the recent development on the switched reluctance machine operating in generating mode in both the low and high speed operations. The machine consists of a salient rotor and stator poles and controlled via switching of the power electronic devices. There is a steady development of the machine operating in the motoring mode; however, its generating operation is still under study. This paper gives an overview of the machine, followed by the principle of operation in generating mode and briefly discusses the structure and types of control methods which involve the switched reluctance generator (SRG). Due to its geometry simplicity and advantages such as robust, ability to operate over a wide speed range and absence of permanent magnet and windings on the rotor, the SRG promises to be a good candidate for variable speed application.
Load Effect on Switched Reluctance Starter/Generator System in Aircraft
Shoujun Song,Weiguo Liu
International Journal of Electrical and Power Engineering , 2012, DOI: 10.3923/ijepe.2010.19.26
Abstract: Switched Reluctance Machine (SRM) is considered as a prime candidate for Combined Starter/Generator (CS/G) in More/All Electric Aircraft (M/A EA). In this study, the effect of the load on the power quality of the Switched Reluctance Starter/Generator (SR S/G) system is studied. The loads are mainly divided into three groups, namely conventional, special and constant power loads. Many simulation results, such as curves of output voltage and phase current under loading and unloading conditions are given. Furthermore, the effect of the Constant Power Loads (CPLs) on the system stability is analyzed briefly.
Switched Reluctance Generator for Variable Speed Wind Energy Applications  [PDF]
Amissa Arifin, Ibrahim Al-Bahadly
Smart Grid and Renewable Energy (SGRE) , 2011, DOI: 10.4236/sgre.2011.21004
Abstract: The aim of this paper is to analyze the potential of switched reluctance generator (SRG) in wind energy application. The machine comprises of switched reluctance generator, power converter and controller. In this paper the main ele-ments that form the generator system is discussed. It also highlights the common type of converter and structure used for SRG in wind energy application and types of control strategy available. Using power converter for switching the generator can operate over a wide speed range. Its applications in high speed area such as starter/generator for air-craft and gas turbine has been established, however the low/medium speed operation is still at an early stage of re-search. In order to subject the machine to various parameters, offline modeling is being investigated to produce the best optimum design.
An Integrated Wind and Hydro Power System Using Switched Reluctance Generator  [PDF]
Ibrahim Al-Bahadly
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.62001
Abstract: This research work seeks to make renewable energy more reliable, cost effective, and accessible by exploring a different energy combination system to that currently applied to wind and hydro power. Instead of the usual electrical combination of wind and hydro generators, this work involved combining a water and wind turbine mechanically, before driving an electrical generator. This new combination system was modeled and optimized in MATLAB, using a direct combination system commonly found in multi-engine helicopters. The system was found to operate satisfactorily, however it is mechanically more complex than current electrical combining systems. Research was undertaken regarding wind and water resource availability, and the turbines were chosen with these taken into consideration. Various combination systems were explored, including torque and speed split mechanical combinations, conventional electrical combination, and using a modified switched reluctance generator as a method of electro-mechanical combination. The generator selected for this work is a three phase 12/8 Switched Reluctance (SR) machine. A detailed winding polarity having four poles per phase and their effect on the performance of the machine is observed
Voltage Control of a 12/8 Pole Switched Reluctance Generator Using Fuzzy Logic  [PDF]
Najmeh Faridnia, Masume Seyedyazdi, Faridoon Shabaninia
International Journal of Modern Nonlinear Theory and Application (IJMNTA) , 2012, DOI: 10.4236/ijmnta.2012.13016
Abstract: This paper presents a voltage controller for a 12/8 switched reluctance generator (SRG). SR machines have a robust with simple structure because they have no windings or permanent magnets on the rotor, so they are capable of working at high speed application and at rough condition. However, due to nonlinear nature, doubly salient poles, time variant parameters, and non-ideal current waveform, The SRG output voltage inherently contains ripples. The proposed voltage controller is based on fuzzy logic that is very efficient over uncertainty and parameter variations. The effectiveness of the proposed control method is verified by comparing the obtained result with that of a PI-controller.
A New Two Phase Bidirectional Hybrid Switched Reluctance Motor/Field-Assisted Generator  [PDF]
E. Afjei,A. Seyadatan,H. Torkaman
Journal of Applied Sciences , 2009,
Abstract: The switched reluctance motor is a simple and robust machine, which has found application over a wide power and speed ranges in different shapes and geometries. This study introduces a new two phase hybrid configuration for a switched reluctance motor/field assisted generator. The proposed novel motor/generator consists of two magnetically independent stator and rotor sets (layers), where each stator set includes four salient poles with windings wrapped around them, while the rotor comprises of two salient poles. There is a stationary reel, which has the field coils wrapped around it and is placed between the two-stator sets. The two sets are connected independently in the motor mode of operation. In this connection the poles in each layer can have both North and South Pole configurations. In the generator mode, the stator poles in one set can have either north or south pole configuration and the stator poles in the other set (layer) have the opposite pole arrangement. In this format, the developed magnetic field from the stator poles goes to the rotor poles after that to the rotor shaft and then completes its path via the motor/generator housing. To evaluate the motor performance, two types of analysis, namely, the numerical technique and the experimental study have been utilized. In the numerical analysis, the finite element analysis is employed, where as in the experimental study, a proto-type motor has been built and tested.
Simulation of Switched Reluctance Generator in Low and Medium Speed Operations for Wind Energy Application  [PDF]
A. Arifin,I. H. Al-Bahadly,S. C. Mukhopadhyay
ISRN Renewable Energy , 2012, DOI: 10.5402/2012/327296
Abstract: This paper provides a new approach to maximize the amount of power generated by the switched reluctance generator (SRG) in the low and medium speed operations. There are many control variables which affect the power generated such as: firing angles, reference current, speed and voltage. It will incur high costs and time consuming to modify the variables using experimental set up. Hence, to minimize time, cost and aid in the manufacturing industry, a simulation model of the overall SRG drive is developed. The objective of the work is to identify the optimal parameters and characterize them under closed loop control. The study indicates that there is an optimal voltage, firing angles and reference current at each speed range. Also, the percentage of the power generated can be categorized as a function of dwell angle and speed at optimal voltage level. The optimal dwell angle is determined using the least square method. Within the closed loop system, the high percentage of power generated can be maintained by adjusting the voltage level. It allows operation in single pulse mode as opposed to the conventional current chopping during the low and medium speed. 1. Introduction Development of switched reluctance machine (SRM) as a motor has been rapid especially in the areas of hybrid electrical vehicles [1–4], aerospace integral starter/generator [5–8], system and also in domestic appliances such as washing machine and vacuum cleaner. It has attracted many researches due to its robust and simple design as well as the ability to operate over a wide speed range. Little however has been done on the study of the machine in generating mode. This paper is focused on the development of the SRG for wind energy application which is categorized under the low and medium-speed range. Some studies relative to this issue have been reported. Several publications offered their contribution to the development and study of the SRG in wind energy applications [9–12]. The research, however, is limited to exploring the different types of control for operation of SRG in variable speed applications. There are also studies in the area of optimal control, machine structure and converter requirement [13]. In [14–18], investigations on the number of stator and rotor poles on machine performance have been made. They have come to an agreement that low number of poles are for high-speed application whereas a high number of poles relate to low-speed application. However, at this stage of research there is no right combination which gives optimum performance. A number of literatures
Analysis of Electromagnetic Behavior in Switched Reluctance Motor for the Application of Integrated Air Conditioner on-Board Charger System
Jianing Liang;Linni Jian;Guo Xu;Ziyun Shao
PIER , 2012, DOI: 10.2528/PIER11112501
Abstract: In order to achieve low cost and compact design, it becomes more and more popular to integrate the circuit of the on-board charger into other power electronic circuits existing in EVs. In this paper an integrated air conditioner on-board charger system based on switched reluctance motor (SRM) was proposed, and the electromagnetic behavior occurring in the SRM when working in the charging mode was investigated. Three charging patterns, viz. single-phase charging, double-phase charging and triple-phase charging were analyzed. The specific rotor positions for which the rotor can be kept still when injecting charging currents to the armature windings were identified. The optimal design for maximizing the keeping-still capability was conducted. The power losses occurring in the SRM when working in charging mode were estimated.
Sliding Controller of Switched Reluctance Motor
Ahmed TAHOUR,Abdelkader MEROUFEL,Hamza ABID,Abdel Ghani AISSAOUI
Leonardo Electronic Journal of Practices and Technologies , 2008,
Abstract: This paper presents an application of sliding mode control for switched reluctance motor (SRM) speed. The sliding mode technique finds its stronger justification in the utilization of a robust control law to model uncertainties. A sliding mode controller of the motor speed is then designed and simulated. Digital simulation results shows that the designed sliding speed controller realises a good dynamic behaviour of the motor, a perfect speed tracking with no overshoot and a good rejection of impact loads disturbance. The results of applying the sliding mode controller to a SRM give best performances and high robustness than those obtained by the application of a conventional controller (PI).
Design of Switched Reluctance Motor for Elevator Application  [cached]
T. Dinesh Kumar,A. Nagarajan
Journal of Asian Scientific Research , 2013,
Abstract: This paper describes methodology to calculate required motor power rating for elevator and lift application. Switched reluctance motor an excellent candidate for traction applications contributes more in low speed-high torque application. Quality of lift is analyzed by its smoothness, without any jurg. Torque production in motor during acceleration and deceleration decides Smoothness of lift. In this paper a switched reluctance motor is designed and analyzed which gives precise control over its speed-torque profile.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.