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23,598 Article Results

A High Efficient High Input Power Factor Interleaved Boost Converter

https://ijece.iaescore.com/index.php/IJECE/article/view/5329
Jayakumar M S , Ajeesh G
In this paper an improved ZVT interleaved boost PFC topology is introduced. The proposed ZVT interleaved boost converter is composed of two cell boost conversion units and an active auxiliary circuit. The proposed converter has two important advantages over the similar soft switching converters. The first one is that parallel to the main switches of the converter the auxiliary switch also operates under soft switching condition. Providing soft switching conditions for interleaved boost converters with more than one cells using only one auxiliary switch is another advantage of this topology. The prototype for the proposed converter was developed with an input of 110V-220V ac power supply feeding a resistive output load of 600 watts. In addition, the proposed converter has the advantages of fewer structure complications, lower cost and ease of control.DOI:http://dx.doi.org/10.11591/ijece.v2i3.254
Volume: 2
Issue: 3
Page: 339-344
Publish at: 2012-03-15

A Comparative Performance Analysis of Torque Control Schemes for Induction Motor Drives

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4896
R Rajendran , Dr. N.Devarajan
This paper presents a comparative study of field-oriented control(FOC), conventional direct torque control(DTC) and proposed space vector modulated direct torque control with low pass filter(SVM-DTC). The main characteristics of FOC, DTC and proposed SVM-DTC schemes are studied by simulation, emphasizing their advantages and disadvantages. The performance of three control schemes is evaluated in terms of torque, current ripples and transient responses. It is shown that the proposed scheme improves the performance by combining a low torque, current ripple characteristics with fast torque dynamics.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.207
Volume: 2
Issue: 2
Page: 177-191
Publish at: 2012-03-14

Three Phase Two Leg Neutral Point Clamped Converter with output DC Voltage Regulation and Input Power Factor Correction

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4892
Bogimi Sirisha , P. Satish Kumar , N. Susheela
In this paper, a three-phase two leg neutral point clamped (NPC) converter is presented for power factor correction and dc-link voltage regulation. The adopted converter has simpler circuit configuration and less number of power switches compared to three-level PWM converter. In this circuit configuration, only eight power switches and four clamping diodes with voltage stress of half the dc bus voltage are used. A simplified space vector pulse width modulation scheme (SVPWM) is also adopted to track the line current commands. A reference voltage vector is generated on the ac terminal for drawing the sinusoidal line currents with unity power factor. This algorithm reduces the time required to calculate the switching time durations of voltage vectors. The simulation results have been presented to verify the validity and effectiveness of the proposed control strategy.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.226
Volume: 2
Issue: 2
Page: 138-150
Publish at: 2012-03-14

DSP Based Vector Control of Five-Phase Induction Using Fuzzy Logic Control

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4897
Zakaria Mohamed Salem
This paper proposes an indirect field oriented controller for five-phase induction motor drives. The controller is based on fuzzy logic control technique. Simulation is carried out by using the Matlab/Simulink package. A complete control system experimentally implemented using digital signal processing (DSP) board. The performance of the proposed system is investigated at different operating conditions. The proposed controller is robust and suitable to high performance five-phase induction motor drives. Simulation and experimental results validate the proposed approaches.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.217
Volume: 2
Issue: 2
Page: 192-202
Publish at: 2012-03-14

A Multilevel Quasi Matrix Converter Design for SRM Drives In EV Applications

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4895
Syeda Fatima Ghousia
This paper presents a novel idea of developing an absolute, general choice multilevel asymmetric power converter for switched reluctance motor (SRM) drive suitable specifically in electric vehicle applications. For SRM drives, the suitability of a particular inverter circuit changes with the motor geometry. It is in contrast to the drives operating with sinusoidal voltages and currents where the inverter topology is independent of the motor design. Specifically, in the case of SRM, the number of the stator/rotor poles and the related issues of the dwell angle and current overlap parameters affect the inverter choice. The multilevel power converters open up a great deal of possibilities in control and can be used to achieve flexible current profiling but with the added benefit of lower switching frequencies and hence less converter losses. The idea is to use a matrix converter topology for finer control on flexible current profiling with three terminals of dc voltage source at the input. To illustrate the potential benefits of this converter, with SRM for EV applications, a Simulink model of proposed multilevel matrix converter was tested in interface with finite element model of the SRM.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.224
Volume: 2
Issue: 2
Page: 170-176
Publish at: 2012-03-14

Adaptive Recurrent Network Network Uncertainty Observer Based Integral Backstepping Control for a PMSM Drive System

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4891
Chih-Hong Lin , Ren-Cheng Wu
The permanent magnet synchronous motor (PMSM) is suitable for high-performance servo applications and has been used widely for the industrial robots, computer-numerically-controlled (CNC) machine tools and elevators. The control performance of the actual PMSM drive system depends on many parameters, such as parameter variations, external load disturbance, and friction force. Their relationships are complex and the actual PMSM drive system has the properties of nonlinear uncertainty and time-varying characteristics. It is difficult to establish an accurate model for the nonlinear uncertainty and time-varying characteristics of the actual PMSM drive system Therefore, an adaptive recurrent neural network uncertainty observer (ARNNUO) based integral backstepping control system is developed to overcome this problem in this paper. The proposed control strategy is based on integral backstepping control combined with RNN uncertainty observer to estimate the required lumped uncertainty. An adaptive rule of the RNN uncertainty observer is employed to on-line adjust the weights of sigmoidal functions by using the gradient descent method and the backpropagation algorithm in according to Lyapunov function. This ARNNUO has the on-line learning ability to respond to the system’s nonlinear and time-varying behaviors. Experimental results are executed to show the control performance of the proposed control scheme.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.260
Volume: 2
Issue: 2
Page: 127-137
Publish at: 2012-03-14

Impact Analysis of Dwell Angles on Current Shape and Torque in Switched Reluctance Motors

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4894
Syeda Fatima Ghousia
The reduction of torque ripple is the main target in research for designing a variable drive system with switched reluctance motors (SRM) for higher torque density and better efficiency. This ripple is due to the transition of excitation current between the adjacent phases. Precise control of turn-on and turn off angle is required to smooth the torque. In this paper, the effects of selecting the turn-on and turn-off angles are simulated in detail. It is observed that with the extended turn-on and turn off angles, the precise selection of turn-on and turn off angle can alter the shape of the excitation current in the stator coil and its point of overlapping with the adjacent coil. Therefore the transition between different phases can be smoothed out. The impact of this alteration on the excitation current and torque ripple as a function of different parameters of dwell angle is studied in detail in this paper. It is found that a sinusoidal current shape can also be obtained with the proper selection of these parameters.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.236
Volume: 2
Issue: 2
Page: 160-169
Publish at: 2012-03-14

Influence of Harmonics in Laboratory due to Nonlinear Loads

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4899
Risnidar Chan , Ismail Daut , Syafruddin Hasan , Norhaidar Hasim
This research was focused on the customer’s side of the meter which is the effect of harmonics on a laboratory in Electrical System Engineering School at K.Wai Perlis. Harmonic currents in equipments can cause them to experience overheating and increased losses, while harmonic voltage produces magnetic fields rotating at a speed corresponding to the harmonic frequency. This also results in equipments heating, mechanical vibrations and noise, reduced efficiency, reduced life, and voltage stress on insulation of equipment windings. The loads in this research are computers, Compact Fluorescent Lamps CFLs), Air Conditions and printers,which all of the loads are harmonic significant The instrument to measure and monitoring is Fluke 435 Power Quality Analyzer. With the operation of varying nonlinear loads, the injected harmonic current magnitudes and phase angles vary in a random way. This research offers the advantage of providing the utility a wealth of information on the effects of harmonics in their equipments. This will subsequently make them aware of the causes of increased cost and reduced efficiency that may be experienced by using these equipments. This paper describes the investigation cost of harmonic effect as THD, and harmonic energy losses cost.Keywords: harmonics, nonlinear loads, Energy losses cost, THD.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.142
Volume: 2
Issue: 2
Page: 219-224
Publish at: 2012-03-14

Effect of Rotor Current Control for Wound Rotor Induction Generator on the Wind Turbine Performance

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4890
Mahmoud Rabie Barakat
This paper presents the effect of rotor current control of wound rotor induction generator driven by wind turbine during different operation modes when varying the rotor resistance. The studied modes are wind speed variation, starting especially at high wind speed. Moreover, the effect of the proposed control on short circuit and critical fault clearing time is investigated.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.213
Volume: 2
Issue: 2
Page: 117-126
Publish at: 2012-03-14

Novel Optimization Technique for PI Controller Parameters of ac/dc PWM Converter using Genetic Algorithms

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4893
Vishnu Mohan Mishra , Amar Nath Tiwari , Nikhlesh Kumar Sharma
The aim of this paper is to present a novel control scheme and designing of reactance parameter of PWM convereterand,  find the optimized value of parameters for voltage PI controller for three phase ac/dc PWM converter. Using new trends Genetic algorithms- are discussed, as well.Paper describes the application of Genetic Algorithms for optimization of controller parameters of PWM converter. The behavior of the stability region is plotted with different sampling periods.Genetic Algorithms used for off-line searching Using the MATLAB, the simulation model of the dc- link PWM ac/dc converter is built up. According to the simulation results, it is known that, the presented control strategy is feasible and valid, and the converter can work well under dc motor load condition, and thus the total harmonics distortion (THD) can be reduced quickly and effectively. The PWM rectifier operates as a rectifier to supply dc power to its load a dc motor and at the same time, to improve the power factor and to compensate harmonics drawn from non-linear loads connected on the ac line.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.156 
Volume: 2
Issue: 2
Page: 151-159
Publish at: 2012-03-14

Analysis of Discontinuous Space Vector PWM Techniques for a Seven-Phase Voltage Source Inverter

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/4898
Mohd. Arif Khan , Atif iqbal , Sk Moin Ahmad , zakir husain
This paper presents discontinuous space vector PWM (DPWM) techniques for a seven-phase voltage source inverter (VSI). Space vector model of a seven-phase VSI shows that there exist 128 space vectors with different lengths and maps into fourteen sided polygons. A number of possibilities could arise to implement modulation of inverter legs due to large number of available space voltage vectors. Two strategies are adopted here; one utilising large and two middle sets of space vectors to implement discontinuous space vector PWM. Clamping of legs of inverter to either positive or negative dc bus leads to discontinuity in the switching and consequently offers reduced switching loss modulation strategy. A significant reduction in switching losses can be achieved while employing DPWM in a seven-phase VSI. A generalised method is also proposed to realize the DPWM in a seven-phase VSI. Comparison of continuous and discontinuous PWM is presented in terms of switching current ripple. The experimental set-up is illustrated and the experimental results are presented.DOI: http://dx.doi.org/10.11591/ijpeds.v2i2.244
Volume: 2
Issue: 2
Page: 203-218
Publish at: 2012-03-14

Implimentation of Evolutionary Particle Swarm Optimization in Distributed Generation Sizing

https://ijece.iaescore.com/index.php/IJECE/article/view/5380
J.J. Jamian , M.W. Mustafa , H. Mokhlis , M.A. Baharudin
The size of Distributed Generation (DG) is very important in order to reduce the impact of installing a DG in the distribution Network. Without proper connection and sizing of DG, it will cause the power loss to increase and also might cause the voltage in the network to operate beyond the acceptable limit. Therefore, most researchers have concentrated on the optimization technique to regulate the DG’s output to compute its optimal size. In this paper, the concept of Evolutionary Particle Swarm Optimization (EPSO) method is implemented in sizing the DG units. By substituting the concept of Evolutionary Programming (EP) in some part of Particle Swarm Optimization (PSO) algorithm process, it will make the process of convergence become faster. The algorithm has been tested in 33bus distribution system with 3 units of DG that operate in PV mode. Its performance was compared with the performance when using the traditional PSO and without using any optimization method. In terms of power loss reduction and voltage profile, the EPSO can give similar performance as PSO. Moreover, the EPSO requires less number of iteration and computing time to converge. Thus, it can be said that the EPSO is superior in term of speed, while maintaining the same performance.DOI:http://dx.doi.org/10.11591/ijece.v2i1.227
Volume: 2
Issue: 1
Page: 137-146
Publish at: 2012-03-01

Fuzzy based Power Flow control of Two Area Power System

https://ijece.iaescore.com/index.php/IJECE/article/view/5379
K Manickavasagan
This paper deals with the novel approach of fuzzy based power flow control of two area power system. Interconnected operation enables utilities to share the generation from one area to other areas. In each area, all the generators are synchronized at same frequency. The change in system load within the area causes frequency deviation in the generating buses and tie line error in the tie lines connecting neighboring areas. The control of interconnected power system is achieved by Automatic Generation Control (AGC), which maintains the balance between generation and load. In this paper, the components of AGC, frequency deviation (DF), tie line error (DPtie) and the output change in generations (DPgi) are calculated by steady state power flow analysis using decoupled Newton Raphson method. The control action is performed by conventional method using participation factor and Fuzzy Logic Controller (FLC). The DF and DPtie are the inputs to the conventional controller and Fuzzy Logic Controller (FLC). The proposed method is tested with modified IEEE 30 bus system and the results are compared. Analysis reveals that FLC is quite capable of suppressing the frequency deviation and tie line error effectively as compared to that obtained with conventional controller.DOI:http://dx.doi.org/10.11591/ijece.v2i1.219 
Volume: 2
Issue: 1
Page: 130-136
Publish at: 2012-03-01

Factors effect on the effective length in a double strap joint between steel plates and CFRP

10.11591/ijaas.v1.i1.pp11-18
Majid Mohammed Ali Kadhim
This paper presents the behavior of axially loaded flat steel plates strengthened using carbon fiber reinforced polymer sheets. Two steel plates were joined together with adhesive and followed by the application of carbon fiber sheet double strap joint with different bond lengths. The effective length of CFRP sheet has been study by using commercially available finite element analysis software ANSYS V12.1. A parametric study has been performed by numerical modeling with the variables of CFRP sheet thickness, adhesive layer thickness, steel plate thickness and number of CFRP sheet layer.
Volume: 1
Issue: 1
Page: 11-18
Publish at: 2012-03-01

Time and Cost Performance in Construction Projects in Southern and Central Regions of Peninsular Malaysia

10.11591/ijaas.v1.i1.pp45-52
Aftab Hameed Memon , Ismail Abdul Rahman , Ade Asmi Abdul Azis
Time and cost performance is the fundamental criteria for success of any project. Unfortunately construction industry in Malaysia has been regarded as industry facing poor performance leading to failure in achieving effective time and cost performance. As a consequence most of the project face huge amount of time and cost overrun. This study assessed the time and cost performance of construction projects in Malaysia using structured questionnaire survey. The findings of study revealed that 92% of construction projects were overrun and only 8% of project could achieve completion within contract duration. The amount of time overrun was in between 5-10% as agreed by respondents. In terms of cost performance only 11% of respondents mentioned that normally their projects are finished within the budgeted cost while 89% of respondents agreed that their projects were facing the problem of cost overrun with average overrun at 5-10% of contract price.  The major contributors of this poor performance include design and documentation issues, financial resource management and project management and contract administration issues. Further, qualitative study was carried out using semi-structured interviews with the experience personnel involving in managing construction project which resulted in developing 13 mitigation measure to improve time performance and 15 mitigation measure to improve cost performance in construction project. This study will help the practitioners to implement the mitigation measure at planning stage in order to achieve successful construction projects.
Volume: 1
Issue: 1
Page: 45-52
Publish at: 2012-03-01
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