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Bulletin of Electrical Engineering and Informatics

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Published by Universitas Ahmad Dahlan

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Core Subject : Engineering,

Electrical & Electronics Engineering

Bulletin of Electrical Engineering and Informatics (Buletin Teknik Elektro dan Informatika) ISSN: 2089-3191, e-ISSN: 2302-9285 is open to submission from scholars and experts in the wide areas of electrical, electronics, instrumentation, control, telecommunication and computer engineering from the global world. The journal publishes original papers in the field of electrical, computer and informatics engineering.

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Articles 12 Documents

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Search results for , issue "Vol 5, No 2: June 2016" : 12 Documents clear

A Novel Grid Connected Photovoltaic System Ali Rahnamaei; Mahdi Salimi
Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016
Publisher : Institute of Advanced Engineering and Science

Inthispaper, a novel grid connected photovoltaic system is proposed which can function as an Active Power Filter (APF) with Maximum Power Point Tracking (MPPT). Filter reference current is derived using Fourier Transform. Considering 33% reduction in inverter switches, cost of the grid-connect photovoltaic power plant can be reduced considerably. Using this approach, it is also possible to compensate for reactive and harmonic components of the local loads; moreover it can inject generated active power into grid at maximum power point of the photovoltaic cells. According to this, during daytime, the proposed system injects active power to the grid and at the same time compensates for the reactive power of the load. When there is no sunlight, the inverter only compensates local loads. Considering cost reduction, such capabilities may result in more application of the grid connected photovoltaic systems. Main novelty of the proposed system is simultaneous APF and MPPT functioning using single DC/AC converter. In fact, extra DC-DC converter is not required in the proposed system for MPPT. In order to verify the performance of the proposed method, some simulation is done using MATLAB/Simulink software. Also, some experimental results are presented for practical verification of the proposed grid connected inverter.

Mitigation of Lightning Hazards at the More Sensitive Points in Wind Farms Using Ant-Colony Optimization Technique MA Abd-Allah; A Said; Mahmoud N Ali
Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016
Publisher : Institute of Advanced Engineering and Science

The lightning energy can be very harmfull to the wind turbine farm components. This paper attempts to evaluate the overvoltages at the sensitive points in wind farm, using ATP-EMTP package program. Four cases were performed; a) the transient voltage distribution in the insulating layer of the control line, b) the transient voltage on the control equipment, c) the coupling voltage between the tower and the control, and, d) the transient voltage distribution in the wind turbine WT generator, boast transformers and grid. These cases were performed under different lightning current conditions and at conventional design and proper design of grounding system. The results show that the ground potential rise (GPR) is reduced with using the proper design of wind turbine ground system, but the induced voltage at the control system will not affected. This work determines the optimum location of wind turbine at the areas of maximum lightning incidence. Ant colony optimization (ACO) technique is implemented to find the optimum wind farm location. This work enhances the protection strategy of the wind farms against lightning stroke.

Reliability Evaluation of Wind Turbine Systems’ Components Seyed Mohsen Miryousefi Aval; Amir Ahadi
Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016
Publisher : Institute of Advanced Engineering and Science

The increasing use of wind generation requests modifications in the electric power systems planning conception, because it includes one more uncertainty component, which needs to be studied properly and modeled. Understanding the failures rates and downtimes of wind turbines is difficult not only because of the considerable range of designs and sizes that are now in service worldwide but also since studies are conducted independently under various operating conditions in different countries. The fault tree method (FTA) has been used to study the reliability of many different power generation systems. This paper now applies that method to a wind turbine system to estimate the reliability of wind turbines. In the implementations, several types of wind turbines were considered in order to analyze the system’s reliability. The effectiveness of the proposed method is revealed through several case studies.

A Survey of Fault-Injection Methodologies for Soft Error Rate Modeling in Systems-on-Chips Yeong Seob Jeong; Seong Mo Lee; Seung Eun Lee
Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016
Publisher : Institute of Advanced Engineering and Science

The development of process technology has increased system performance, but the system failure probability has also significantly increased. It is important to consider the system reliability in addition to the cost, performance, and power consumption. In this paper, we describe the types of faults that occur in a system and where these faults originate. Then, fault-injection techniques, which are used to characterize the fault rate of a system-on-chip (SoC), are investigated to provide a guideline to SoC designers for the realization of resilient SoCs.

Design of a Low-cost and Compact Radiometer for Spectral Acquisition of Vegetation and Bare Soil Mokhtaria Nawel Zemaili; Noureddine Benabadji; Abdelatif Hassini
Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016
Publisher : Institute of Advanced Engineering and Science

We describe, in this article, the design of a low-cost and compact radiometer with five analog channels for spectral acquisition: four in the visible (blue, green, red and panchromatic) and one channel in the near-infrared. This small embedded system is based on an 8-bit microcontroller for automatic data acquisition, calibrating, storing and serial link processing with a compatible PC, through a C++ application software provided to handle and deal with the mass of data collected and stored in an EEPROM. The acquisition of spectral reflectance measurements of an object for different wavelengths allows the construction of a characteristic curve, named spectral signature of the object. The study of the spectral signatures of different types of surfaces such as water, bare ground or vegetation allows their identification in remote sensing image processing, and consequently, facilitates the interpretation of this kind of data, as, for instance, the AVHRR data of the HRPT images acquired and freely distributed by the satellite NOAA.

Electromagnetic Modeling of Active Circuit using Wave Concept Iterative Process Amri Houda; Zaabat Mourad
Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016
Publisher : Institute of Advanced Engineering and Science

The wave concept iterative process is a procedure used for analyses planar circuits, this method consists in generating a recursive relationship between a wave source and reflected waves from the discontinuity plane which is divided into cells. A high computational speed has been achieved by using Fast Modal Transform (FMT). In this paper we study a patch antenna and MESFET transistor, to determine the electromagnetic characteristics of these structures.

Unrestricted Charging Controllar Design Magnitude Amit Sachan; Ashish Ranjan
Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016
Publisher : Institute of Advanced Engineering and Science

This paper presents to be routine in DC/DC phase of Bi-directional battery charger. The neutral is to analyst the filter latitude that will additional shrink the system cost and capacity. Key area is to moderate current ripple of the charging current which produce will approximately ripple unrestricted charging for batteries. Ripple unrestricted charging will shrink the further warmth triggered by the current ripple and surge the battery life. The filter-centered controller is project to transaction with the latent variability problem carried by a high order filter. The filter-centered technique has the compensations of effortlessly operation and no essential of additional current or voltage sensors. This dc/dc phase communicate converter to ease the charging purpose. Together low pass filter centered controller and nick filter based controller are evaluated and nick filter based controller has improved routine.

Zinc Oxide Thin Film Transistors: Advances, Challenges and Future Trends Kavindra Kandpal; Navneet Gupta
Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016
Publisher : Institute of Advanced Engineering and Science

This paper presents a review on recent developments and future trends in zinc oxide thin film transistors (ZnO TFTs) together with challenges involved in this technology. It highlights ZnO TFT as next generation choice over other available thin film transistor technology namely a – Si: H (amorphous hydrogenated silicon), poly-Si (polycrystalline silicon) and OTFT (organic thin film transistor). This paper also provides a comparative analysis of various TFTs on the basis of performance parameters. Effect of high –k dielectrics, grain boundaries, trap densities, and threshold voltage shift on the performance of ZnO TFT is also explained.

Selection of Gate Dielectrics for ZnO Based Thin-Film Transistors Vaibhav Garg; Navneet Gupta
Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016
Publisher : Institute of Advanced Engineering and Science

The bulk of semiconductor technology has been based on silicon till today. But silicon has its own limitations. It is not transparent to visible light and hence it cannot be used in certain applications. ZnO is a material which is transparent to visible light. In this paper, we compare the electrical performance of ZnO Thin film Transistors using different gate insulators. Certain performance indices and material indices were considered as the selection criteria for electrical performance. A methodology known as Ashby’s approach was adopted to find out the best gate insulators and based on this methodology various charts were plotted to compare different properties of competing materials. This work concludes that Y2O3 is the best insulator followed by ZrO2 and HfO2.

Development of Emulation Network Analyzer Tool for Computer Network Planning Mohd Nazri Ismail; Abdullah Mohd Zin
Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016
Publisher : Institute of Advanced Engineering and Science

This paper describes the development of Emulation Network Analyzer (ENA) for heterogeneous services in campus environment. The purpose of this paper is to inform this ENA able to plan and predict network performance. For this purpose, our ENA development is differ from others system such as application and hardware network analyzer. This study focuses on the design of emulation network analyzer, user interface design, characteristics, model description, implementation and evaluation. This ENA can provide a useful network architectural solutions and optimization of network resources during preparation, proposal and planning phases. Finally, ENA tool is a good emulation analyzer that can be used in small to medium size networks for campus environment purposes with minimum cost.

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