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28,269 Article Results

Comparative Study of Three Phase Grid Connected Photovoltaic Inverter Using PI and Fuzzy Logic Controller with Switching Losses Calculation

10.11591/ijpeds.v7.i2.pp543-550
M. Venkatesan , R. Rajeshwari , N. Deverajan , M. Kaliyamoorthy
A comparative study of three phase grid connected photovoltaic (PV) inverter using Proprotional Controller (PI) and Fuzzy Logic Controller (FLC) is presented in this paper. Proposed three phase inverter with single DC source employing three phase transformer for grid connected PV system controlled by using Space Vector Pulse Width Modulation (SVPWM) technique.  PI and FLC are used as current controller for regulating the current. Perturb and observe Maximum Power Point Technique (MPPT) is used for tracking of maximum power from the PV panel. Finally Total Harmonic Distortion (THD) comparison made between two controllers for validation of results. Furthermore swithing losses of inverter are also presented. The simulation results are obtained using MATLAB simulink.
Volume: 7
Issue: 2
Page: 543-550
Publish at: 2016-06-01

An Overview on Current Researches on Underwater Sensor Networks: Applications, Challenges and Future Trends

10.11591/ijece.v6i3.pp955-962
Pedram Vahdani Amoli
Nowadays, Underwater Sensor Networks (UWSN), in which data is collected through underwater sensors, have drawn lots of concern. Generally, wireless sensor network (WSNs) have important applications such as remote environmental monitoring and target tracking. This possibility is enabled by the available smaller and cheaper sensors. These sensors are equipped with wireless interfaces which they form a network. However, there are various problems specified to underwater environments, including the communication medium. Designs of these types of networks significantly depend on their application, and factors such as environment, design objectives of the application, cost, hardware and system constraints. The goal of this work is to review the literature on various aspects of UWSNs, and present an overview of several new applications and their challenges on UWSN. Publications are reviewed to show the statistics of published works in several aspects.
Volume: 6
Issue: 3
Page: 955-962
Publish at: 2016-06-01

A Overlapping Carrier Based SPWM for a 5-Level Cascaded H-bridge Multilevel Inverter

10.11591/ijpeds.v7.i2.pp349-357
Kureve D. Teryima , Goshwe Y. Nentawe , Agbo O. David
This paper proposes a switching control for a cascaded H-bridge inverter structure with reduced switches which is used to improve the THD performance of a single phase five level CHB MLI. The multi level inverter is simulated for the conventional carrier overlapping APOD and the proposed carrier overlapping APOD Pulse Width Modulation (PWM) switching control technique. The total harmonic distortion (THD) of the output voltages are observed for both PWM control techniques. The performance of the symmetric CHB MLI is simulated using MATLAB-SIMULINK. It is observed that the proposed carrier overlapping APODPWM provides output with relatively low THD as compared to the conventional carrier overlapping APODPWM.
Volume: 7
Issue: 2
Page: 349-357
Publish at: 2016-06-01

A Novel Cpw Low Cost Lowpass Filter Integrating Periodic Structures

10.11591/ijece.v6i3.pp1106-1111
Fouad Aytouna , Jamal Zbitou , Mohamed Aghoutane , Naima Amar Touhami , Abdelwahed Tribak , Mohamed Latrach
In this work, we propose a novel design of a planar CPW lowpass “LPF” filter based on the use of periodic structures. The periodic cells are formed from a rectangular slot repeated periodically. The originality of this work is to develop a new LPF structure which is simple, low cost for fabrication and easy to associate with others microwave planar circuits. The proposed and validated LPF is a compact planar filter structure. The final circuit is simulated and optimized by using two electromagnetic solvers, ADS (Advanced Design System) and HFSS (High Frequency Structural Simulator). After many series of optimization we have validated the final circuit into simulation by using optimization methods integrated into the both solvers, taking into account a high density of meshing in order to cover the whole circuit. The fabricated LPF circuit shows good agreement between simulation and measurement results in term of matching input impedance and insertion loss with a cutoff frequency of 1.25GHz. The entire area of the proposed LPF is 35x31 mm2.
Volume: 6
Issue: 3
Page: 1106-1111
Publish at: 2016-06-01

Control of DFIG Stator Voltage on Autonomous Micro Hydro Power Plant

10.11591/ijpeds.v7.i2.pp498-508
Feri Yusivar , Nanda Avianto Wicaksono , Aries Subiantoro , Ridwan Gunawan
An autonomous micro hydro power plant was proposed to utilize the small hydro power potency as a run-of-river. It consisted of a PMSG, a DFIG, and a converter and should be operated in the off-grid configuration. In a previous research, the DFIG stator voltages couldn’t be controlled. In this paper, the novel control algorithm that is able to maintain the DFIG stator voltages of the autonomous micro hydro power plant in the off-grid configuration is proposed. The control algorithm was proposed to use the actual DFIG stator voltages and currents as feedback signals. The controller was tested by varying three input signals, i.e. the DC-link voltage, the DFIG stator voltage reference, and the external stator load which simulated the off-grid configuration. The result of the simulation showed that the DFIG stator voltages could be controlled and were always in accordance with the reference.
Volume: 7
Issue: 2
Page: 498-508
Publish at: 2016-06-01

Modelling and Simulation of a Sensorless Control of a True Asymmetric Cascade H-Bridge Multilevel Inverter PMSM Drives

10.11591/ijpeds.v7.i2.pp397-415
Kamel Saleh , Mark Sumner
This paper introduces a new method to track the saliency of an AC motor fed by a multilevel converter through measuring the dynamic current response of the motor line currents due the IGBT switching actions. The method uses only the fundamental PWM waveform (i.e there is no modification to the operation of the multilevel converter) similar to the fundamental PWM method proposed for a 2-level converter. Simulation results are provided to demonstrate the performance of the complete sensorless speed control of a PM motor driven by such a converter over a wide speed range. Finally the paper introduces a comparison between the 2-level converter and the multilevel converter in terms of the reduction of the Total Harmonic Distortion (THD) using the fundamental PWM method in both cases.
Volume: 7
Issue: 2
Page: 397-415
Publish at: 2016-06-01

A Quantum Pointer Signal Processing Research

10.11591/ijeecs.v2.i3.pp675-683
Shuyue Wu , Jingfang Wang
In quantum gray-scale image processing, the storage in quantum states is the color information and the position information According to the advantage of small range of the gray scale in a gray-scale image, a novel storage expression of quantum gray-scale image is proposed and demonstrated in this study. Besides, a new concept of "quantum pointer" is put forward based on the expression. Quantum pointer is the vinculum between the information of gray-scale and position of each pixel in quantum gray-scale images. The feasibility is verified for the proposed quantum pointer, and the properties of bi-direction and sub-block are used, the storing and other operations of quantum gray-scale image are simpler and more convenient. 
Volume: 2
Issue: 3
Page: 675-683
Publish at: 2016-06-01

PID Controller Response to Set-Point Change in DC-DC Converter Control

10.11591/ijpeds.v7.i2.pp294-302
Oladimeji Ibrahim , Nor Zaihar B Yahaya , Nordin Saad
Power converter operations and efficiency is affected by variation in supply voltage, loads current, circuit elements, ageing and temperature.  To meet the objective of tight voltage regulation, power converters circuit module and the control unit must be robust to reject disturbances arising from supply, load variation and changes in circuit elements. PID controller has been the most widely used in power converter control. This paper presents studies of robustness of PID controller tuning methods to step changes in the set point and disturbance rejection in power converter control. A DC-DC boost converter was modelled using averaged state-space mothod and PID controllers were designed with five different tuning methods. The study reveals the transient response and disturbance rejection capability of each tuning methods for their suitability in power supply design applications.
Volume: 7
Issue: 2
Page: 294-302
Publish at: 2016-06-01

Making a Cloud Data Secure and Effective for Better Performance of Services

10.11591/ijeecs.v2.i3.pp695-702
Sangeet Mishra , Asis Kumar Tripathy , Pallavi Joshi
Cloud data security is one of the major and crucial concern in everyday life. Now a days cloud computing is emerging as vast and fastest growing technology depending on the usage. Cloud computing does not allow to keep data at user site and thus a data security is concerned to be a major challenging task regarding data storage. This paper overall describes the monitoring of the cloud data concerning data storage. In this paper we proposed a new methodology that can efficiently managed the security to the data and provide privacy to the consumer using the services of the cloud. Our proposed technique provides data security by using the third party monitoring system which acts as an interface between the cloud consumer and cloud owner. Basically third party monitors the each and every activity of the cloud consumer and based upon his performance he respond to the cloud owner for taking decision. Our proposed concept provides the security from consumer point of view and owner side of view making the flexibility to the cloud infrastructure. Existing work focus mainly on security from owner side of view that not well fitted into the lifecycle of data security.
Volume: 2
Issue: 3
Page: 695-702
Publish at: 2016-06-01

An Improved DTFC based Five Levels - NPC Inverter Fed Induction Motor for Torque Ripple Minimization

10.11591/ijpeds.v7.i2.pp531-542
P. Rajasekaran , V. Jawahar Senthilkumar
This paper presents a five level Neutral Point Clamped (NPC) inverter fed IM (Induction Motor) drive for variable speed application. In general the stator current is very highly affected by the harmonic components. It can be affecting the torque to produce high torque ripple in IM at maximum to low speed region. Since the drive performances are depends on mathematical model contains the parameters variations, noise, common mode voltage, flux variation and harmonic levels of the machine. Torque ripples and voltage saturations are the most significant problems in drive application. To overcome this problem the DTFC (direct torque and flux control) technique based five-level neutral-point-clamped (NPC-5L) approach is used. The proposed control scheme uses to stator current error as variable. Through the resistance estimated PI controller rules based the selection of voltage space vector modulation technique is optimized and motor performance level has been improved. The torque & speed are successfully controlled with less torque response. The results are compared and verified with conventional three phases VSI under different control technique by Matlab/Simulink.
Volume: 7
Issue: 2
Page: 531-542
Publish at: 2016-06-01

Intranet Design Strategies

10.11591/ijece.v6i3.pp936-944
Rohith Roshan Devu , Subba Rao Katta
The intranets have been deployed extensively in large and small-scale organizations. It has grown rapidly by offering features like collaborative communication channels, easing the business processes etc. Typically organizations faced difficulties but they are prevalent while implementation. But the organizations lack clear strategies in designing intranet. It leads to loss on investment, time and productivity, a complete intranet failure. Previous studies mainly focused on management, security and usage etc. This paper presents 9 design strategies for intranet addressing system oriented plan that can be applied in real-time to achieve improvement in organizational performance.
Volume: 6
Issue: 3
Page: 936-944
Publish at: 2016-06-01

Harmonics Reduction in a Current Source Fed Quasi-Resonant Inverter Based Induction Heater

10.11591/ijpeds.v7.i2.pp431-439
Avijit Chakraborty , Titas Kumar Nag , Pradip Kumar Sadhu , Nitai Pal
This paper investigates an approach to reduce the injection of unwanted harmonics from the input side power source. The proposed work finds an application of a suitably designed Low Pass Filter (LPF) for harmonics reduction. The Low Pass Filter is incorporated in between the input power source and high frequency current source fed single switch parallel quasi-resonant inverter of a domestic Induction Heater. The inverter has an Insulated Gate Bipolar Junction Transistor (IGBT) switch. Undesirable harmonics injection to the input power source makes voltage and current waveforms non-sinusoidal. Fast Fourier Transform (FFT) analysis has been applied to study the effect of harmonics in frequency domain. The entire system is realized in Power System Simulator (PSIM) environment. It is finally proved that the proposed filter reduces the Total Harmonic Distortion (THD) and the Distortion Factor (DF) of the input current. It is also proved that the proposed Low Pass Filter can make the input power factor closer to unity.
Volume: 7
Issue: 2
Page: 431-439
Publish at: 2016-06-01

Rotational Load Flow Method for Radial Distribution Systems

10.11591/ijece.v6i3.pp1344-1352
Diego Issicaba , Jorge Coelho
This paper introduces a modified edition of classical Cespedes' load flow method to radial distribution system analysis. In the developed approach, a distribution network is modeled in different complex reference systems and reduced to a set of connected equivalent subnetworks, each without resistance, while graph topology and node voltage solution are preserved. Active power losses are then not dissipated in the modeled subnetworks and active power flows can be obtained as a consequence of radiality. Thus, the proposed method preprocesses a series of variable transformations concomitant to an iterative algorithm using a forward-backward sweep to arrive at the load flow solution. The proposed approach has been tested using literature and actual distribution networks, and efficiency improvements are verified in comparison to Cespedes' load flow method.
Volume: 6
Issue: 3
Page: 1344-1352
Publish at: 2016-06-01

FPGA Based Design and Validation of Asymmetrical Reduced Switch Multilevel Inverter

10.11591/ijpeds.v7.i2.pp340-348
C Bharatiraja , Harshavardhan Reddy , Sunkavalli Satya Sai Suma , N SriRamsai
This paper proposes a new Asymmetrical multilevel inverter topology with reduced number of switches. This topology is superior to the existing multilevel inverter (MLI) configurations in terms of lower total harmonic distortion (THD) value and lower cost. The idea incorporates a new module setup comprising of four different voltage sources having voltage output levels in a specific ratio. The proposed topology uses a novel pulse width modulation (PWM) technique (as presented) to control the gating pulses. The operation is simulated using MATLAB/SIMULINK and its results are validated through FPGA Spartan 3 based hardware prototype inverter (using three voltage sources to produce a 7 level output, which may be extended to 15 level). The circuit complexity is drastically reduced and it is suitable for medium and high power applications. THD for the output is quite low when compared with the conventional inverter.
Volume: 7
Issue: 2
Page: 340-348
Publish at: 2016-06-01

Anthraquinones- A probe to enhance the photovoltaic properties of DSSCs

10.11591/ijece.v6i3.pp1274-1280
Jinchu I , Jyothi R , N Pandurangan , Sreelatha KS , Krishnashree Achuthan , Sreekala CO
Natural dye sensitized solar cells are a promising class of photovoltaic cells with the capacity of generating green energy at low production cost since no expensive equipment is required in their fabrication. Photovoltaics are a precious technology in the hasty world where energy prices are goes on increasing within seconds. Researchers are focusing to facilitate for producing eco-friendly, low cost and more efficient dye sensitized solar cells. In the present work we discuss the comparative photovoltaic studies of Lawsone, a natural dye from henna plant and Alizarin, a natural dye from the root of madder for fabricating the Dye sensitized solar cells (DSSCs). The absorption spectrum of Lawsone and Alizarin is found to be shifted to the longer wavelength region after the complex formation. As a result there is a significant increase in short circuit current density and conversion efficiency. This result compares with the standard dye i.e. N719 dye.
Volume: 6
Issue: 3
Page: 1274-1280
Publish at: 2016-06-01
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