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<![CDATA[A Novel Grid Connected Photovoltaic System ]]>
<![CDATA[Rahnemaei, Ali]]>;
<![CDATA[Salimi, Mahdi]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v5i2.587
<![CDATA[In this paper, 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.]]>
<![CDATA[A Survey of Fault-Injection Methodologies for Soft Error Rate Modeling in Systems-on-Chips ]]>
<![CDATA[Jeong, Yeong Seob]]>;
<![CDATA[Lee, Seong Mo]]>;
<![CDATA[Lee, Seung Eun]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v5i2.617
<![CDATA[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.]]>
<![CDATA[Mitigation of Lightning Hazards at the More Sensitive Points in Wind Farms Using Ant-Colony Optimization Technique ]]>
<![CDATA[Abd-Allah, M. A.]]>;
<![CDATA[Said, A.]]>;
<![CDATA[N. Ali, Mahmoud]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v5i2.618
<![CDATA[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.]]>
<![CDATA[Design of a Low-cost and Compact Radiometer for Spectral Acquisition of Vegetation and Bare Soil ]]>
<![CDATA[Nawel Zemaili, Mokhtaria]]>;
<![CDATA[Benabadji, Noureddine]]>;
<![CDATA[Hassini, Abdelatif]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v5i2.620
<![CDATA[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.]]>
<![CDATA[Zinc Oxide Thin Film Transistors: Advances, Challenges and Future Trends ]]>
<![CDATA[Kandpal, Kavindra]]>;
<![CDATA[Gupta, Navneet]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v5i2.634
<![CDATA[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 â 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 âk dielectrics, grain boundaries, trap densities, and threshold voltage shift on the performance of ZnO TFT is also explained.]]>
<![CDATA[Selection Of Gate Dielectrics for ZnO Based Thin-Film Transistors ]]>
<![CDATA[Garg, Vaibhav]]>;
<![CDATA[Gupta, Navneet]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v5i2.635
<![CDATA[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 Ashbyâs 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.]]>
<![CDATA[Performance Evaluation of SIP Server under Virtualization Environment Along with the Most Common Security Threats ]]>
<![CDATA[Kolhar, Manjur]]>;
<![CDATA[M Abualhaj, Mosleh]]>;
<![CDATA[Alameen, Abdullah]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v5i2.616
<![CDATA[Virtualization is the central point which empowers cloud infrastructure. Many services such as Web-based applications, databases and instant messaging servers have been running on virtual systems to reduce total cost ownership and to get immediate returns on investments. However, applications which are concerned with the latency, such as Voice over IP (VoIP) applications, are rarely found in virtual systems. Hence, our aim is to study VoIPâs behavior in the virtualization environment. Apart from this, VoIP infrastructure should also be equipped with a security shield to protect itself from various forms of security threats; this security setup also brings an extra overhead response time. Hence, in this article, we have implemented VoIP on virtual machine (VM-VoIP) and measured the signaling process of VoIP systems. Performance of the proposed system is studied with and without a security shield. It is observed that the virtualization environment never induces delay during the registration request delay (RRD) part of the signaling. However, the analysis shows that the delay increases with the number of calls during the session request delay (SRD) part of signaling. In addition, the VM-VoIP system consumes more CPU for VoIP call sessions under the security shield.]]>
<![CDATA[Reliability evaluation of wind turbine systemsâ components ]]>
<![CDATA[Ahadi, Amir]]>;
<![CDATA[Miryousefi Avval, Seyed Mohsen]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v5i2.630
<![CDATA[The increasing use of wind generation requests modifications in the electric power systemsplanning conception, because it includes one more uncertainty component, which needs to bestudied properly and modeled. Understanding the failures rates and downtimes of wind turbinesis dicult not only because of the considerable range of designs and sizes that are now in serviceworldwide but also since studies are conducted independently under various operating conditionsin dierent countries. The fault tree method (FTA) has been used to study the reliability of manydierent power generation systems. This paper now applies that method to a wind turbine systemto estimate the reliability of wind turbines. In the implementations, several types of wind turbineswere considered in order to analyze the systemâs reliability. The eectiveness of the proposedmethod is revealed through several case studies.]]>
<![CDATA[A Novel Grid Connected Photovoltaic System ]]>
<![CDATA[Ali Rahnamaei]]>;
<![CDATA[Mahdi Salimi]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v5i2.523
<![CDATA[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.]]>
<![CDATA[Mitigation of Lightning Hazards at the More Sensitive Points in Wind Farms Using Ant-Colony Optimization Technique ]]>
<![CDATA[MA Abd-Allah]]>;
<![CDATA[A Said]]>;
<![CDATA[Mahmoud N Ali]]>
<![CDATA[ Bulletin of Electrical Engineering and Informatics Vol 5, No 2: June 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/eei.v5i2.524
<![CDATA[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.]]>
