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Applied Electrical Engineering and Computing Technologies (AEECT), 2011 IEEE Jordan Conference on

Date 6-8 Dec. 2011

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  • [Title page]

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  • [Copyright notice]

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  • Message from the General Chair

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  • Advisory Committee

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  • Reviewers list

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  • Organizers and sponsors

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  • Authors index

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  • Table of contents

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  • Keynote speech 1: Advanced solar energy conversion technologies to enable smart-grid deployment

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (153 KB)  

    In recent years, significant research progress has been made in advancing photovoltaic energy conversion technologies. This progress has resulted in more and more countries consider deploying smart-grid technologies. Unfortunately, Jordan and the MENA region in general have not kept pace with these developments. There is a need in Jordan to move forward with necessary practical and policy decisions to use and deploy such energy saving technologies. Today's PV installations focus mainly on solar energy conversion, control and grid connectivity technologies. This talk will focus on recent advancement in power electronics inverters for PV energy conversion and how the new solar energy conversion technologies may incorporate smart-grid capabilities in distributed PV systems. Also, why Jordan has great potential to embrace such new technologies. View full abstract»

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  • Computation of static and dynamic axial and radial forces on power transformer windings due to inrush and short circuit currents

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (975 KB) |  | HTML iconHTML  

    In this paper, the radial and axial forces due to inrush and short circuit currents on both inner and outer surfaces of low voltage (LV) and high voltage (HV) windings are calculated. Static and dynamic aspects of these forces which are related to the variation of forces versus winding height and time are analyzed. Power transformer in the start-up mode and under short circuit fault is modeled using two-dimensional (2D) time stepping finite element method (TSFEM). This approach leads to the precise determination of the required signals including current, magnetic flux density, radial and axial forces. Calculated forces are analyzed significantly to compare impacts of the mechanical forces due to inrush and short circuit currents on the windings of the transformer. Three-dimensional (3D) TSFEM is utilized to evaluate aforementioned forces and compare with 2D TSFEM results. In the 3D TSFEM, geometrical and physical characteristics of the all components of the transformer, nonlinearity of the core materials and distribution of the primary and secondary windings are taken into account. 2D TSFEM results are verified by 3D TSFEM results. View full abstract»

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  • Fast and precise method of contingency ranking in modern power system

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (693 KB) |  | HTML iconHTML  

    Contingency Analysis is one of the most important aspect of Power System Security Analysis. This paper presents a fast and precise method of contingency ranking for effective power system security analysis. The method proposed in this research work takes due consideration of both apparent power overloading and voltage violations at the same time. A comparative analysis of previous methods is also presented in this paper. The proposed method has been applied to a 10 bus benchmark power system and results are verified with actual number of violations in each contingency. The proposed technique is based on realistic approach taking practical situations into account. Besides taking real situations into consideration the proposed method is fast enough to be considered for on-line security analysis. View full abstract»

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  • Optimal allocation of DG regarding to power system security via DE technique

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (740 KB) |  | HTML iconHTML  

    This paper presents a novel strategy for optimizing Distributed Generation placement to improvement power system voltage stability margin and reducing losses. This method establishes a tradeoff between the security and power losses by using Differential Evolution (DE) method to reach the best performance and acceptable operation. In recent years, Differential Evolution has been successfully used for the solution of complex optimization problems. Hence, with respect to the behavior of this non-linear hierarchical optimization problem, the proposed method has been developed and examined on IEEE 14 bus test system by a developed Toolbox. View full abstract»

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  • Evaluation of current transformer performance in the presence of remnant flux and harmonics

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (758 KB) |  | HTML iconHTML  

    This paper studies and evaluates the effect of current transformer (CT) distortion parameters on its performance using various secondary current calculation methods according to IEC 44-1 & 44-6 like: magnitude (ratio) error, peak instantaneous error, phase error and composite error. These parameters include: multiple short circuit level (Isc/IR), secondary burden value & type, DC component (X/R ratio & fault inception angle), remanent factor (Kr) and both external & internal harmonics. View full abstract»

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  • A solar-wind hybrid power system for irrigation in Toshka area

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (896 KB) |  | HTML iconHTML  

    This paper is aimed at calculating the power demand of a combined irrigation and domestic load in Toshka area, Toshka, Egypt. The pipe line system for irrigation is designed. An economic feasibility study has been made for hybrid PV-wind system to power this combined load. Sizing of the hybrid system components was investigated using MATLAB Code and HOMER Package. The energy cost values of the hybrid system agrees reasonably with published those before. View full abstract»

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  • Stochastic simulation of a power generation air joint

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1019 KB) |  | HTML iconHTML  

    A novel stochastic simulation approach is employed to predict the reliability of an air-supply expansion joint. This component is part of a large electric power generating system. In order to perform this task, multiple modeling tools are integrated, including Computational Fluid Dynamics, Finite Element Analysis, Stress-life method, and Latin Hypercube Sampling. As a result of the stochastic nature of the input parameters, the resulted life is in the form of a Probability Density Function, which enables the calculation of the reliability of the component at a given life. The application of this method to the air joint can be used to enhance the design and operation of the component by uncovering under-design or over-design. Furthermore, various alternative designs and operational scenarios can be studies using this stochastic model. View full abstract»

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  • Design and implementation of stand-alone residential PV system

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1138 KB) |  | HTML iconHTML  

    This paper is focused on construction of a stand-alone residential 2-kW centralized PV system to feed different domestic loads at a home including lighting loads, washing machine, TV, refrigerator and computer. The stand-alone residential 2-kW PV system consists of PV generator, storage batteries, charge regulator, inverter, filter and maximum power point tracking control system. The paper in steps includes PV modeling, software development for monitoring storage batteries, development of maximum power point tracking controller, design and implementation of an inverter and use of a filter to improve the inverter output waveform. View full abstract»

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  • Economics-based transmission expansion planning in restructured power systems using decimal codification genetic algorithm

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1038 KB) |  | HTML iconHTML  

    Transmission expansion planning is an important component of power system planning that affects all aspects of the power system including both generation and demand side in different ways. An inherent problem to today's restructured power markets is the congestion management problem. Since the transmission system is limited by operational and reliability constraints, the participants face significant congestion costs that can be alleviated by investing in transmission capacity. In this paper, an economics-based transmission expansion planning model is proposed. The model minimizes the costs of investment and congestion over a planning horizon that includes multiple load profiles. Decimal Codification Genetic Algorithm (DCGA) is then used to solve the resulting nonlinear mixed-integer problem. The model proposed here will be particularly useful for independent transmission planners who are responsible for making decisions regarding power network operations. The Garver's 6-bus network is examined to show the adequacy of the proposed model. Testing proposed expansion approach on an actual transmission network of northwest of Iran, the Azerbaijan regional electric company, the results reveals effectiveness of the model to handle realistic power networks. View full abstract»

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  • Optimal tuning of OLTC and RPCE to improve power system voltage stability based on ant colony

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (736 KB) |  | HTML iconHTML  

    This paper proposed a novel strategy based on developed Ant Colony Optimization (ACO) algorithm which attempts to improve the voltage stability of the power systems with respect to minimum real power loss and proper voltages profile. This algorithm uses optimum settings of On-Line Tap Changer transformer (OLTC) and minimum number of Reactive Power Compensation Equipment (RPCE). The proposed algorithm is programmed on MATLAB and examine on IEEE 30-bus Test System to demonstrate the validity and the convenience of ACO approach with promising results. View full abstract»

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  • Voltage flicker estimation using ESPRIT-based method

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (765 KB) |  | HTML iconHTML  

    This paper presents a technique for the estimation of the instantaneous magnitude and frequency of voltage flicker. The technique is based on extracting the magnitudes, frequencies, and phase angles of all frequency components of the measured voltage signal using ESPRIT-based method. By reconstructing the signal as linear combination of sinusoids, Hilbert transform can be applied to the estimated signal to develop the envelope of the signal. The technique has been applied to estimate the voltage flicker of various simulated voltage flicker generated signals. View full abstract»

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  • Electricity sector reform in Africa: Convergence and diversity of approaches

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (801 KB) |  | HTML iconHTML  

    For many years most large utilities and undertakings such as those in electricity production, mining, agriculture, transportation have been controlled by state organs, often called "parastatals" or state enterprises. In the '70's and 80's, African economies did not have severe economic challenges; some countries were even booming (e.g. Nigeria of the '70's). With the passing of time, populations grew and so did unemployment and many African countries experienced financial woes. Service delivery too suffered through inefficiency, over-manning and bad management. Economists and management consultants were brought in from institutions like the World Bank and the IMF. The word "restructuring" soon became a buzz word. The basic philosophy was that these state controlled organizations should operate along business lines. In this paper we examine how four representative countries, Nigeria, Namibia, and South Africa have approached the restructuring issue and the progress they have made. View full abstract»

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  • Evaluation of electrically stressed composite insulators contaminated by dry and wet sand

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (811 KB) |  | HTML iconHTML  

    The present paper investigates the performance of composite insulators working in desert areas. The role of humidity, in characterizing electric field distribution over the dusty shed of such insulator, is illustrated via Finite Element approach. A 2D model for a real long-rod composite insulator is constructed. The model is built to simulate composite insulator in clean and polluted conditions. The maximum field is computed for several dielectric constants according to the humidity of the surrounding air. The change in the restricted angle, between the incident and refracted field lines at the shed/dust boundary, is used as an indicator for the field stress variation in this interfacing area. The impact of applied voltage on the stress distribution is also investigated. Finally, the difference in field between clean and dusty composite insulators is illustrated for a number of permittivities. View full abstract»

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  • Accurate 3D position control of articulated manipulators

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (686 KB) |  | HTML iconHTML  

    Robot manipulators are complex nonlinear dynamic systems. Therefore, various control schemes were adopted to achieve accurate and repeatable motion control. To maintain an accurate position of the forearm when the articulated manipulator moves from a point to point in its workspace, a robust torque control law is required. In this paper, a modified robust single parameter control law is developed to obtain an accurate 3D Cartesian coordinate motion control. The position errors and the maximum torques are related to the controller parameter such that the optimum value of this parameter can be determined. Two cases have been considered, the exact case of certainty and the case of parameter uncertainty. A Matlab program is executed to simulate the manipulator dynamics, as well as to compute and analyze the position accuracy. View full abstract»

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  • Smooth Variable Structure Filter for pneumatic system identification

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (921 KB) |  | HTML iconHTML  

    The Smooth Variable Structure Filter (SVSF) is a newly-developed predictor-corrector filter for state and parameter estimation [1]. The SVSF is based on the Sliding Mode Control concept. It defines a hyperplane in terms of the state trajectory and then applies a discontinuous corrective action that forces the estimate to go back and forth across that hyperplane. The SVSF is suitable for fault detection and identification applications because of its stability and robustness in modeling uncertainties. The SVSF has two indicators of performance; the a posteriori output error and the chattering. The latter - as a signal-contains the system's information which is proven and explored in this paper. The SVSF is applied for the identification of pneumatic systems in order to verify the proposed method. Furthermore, the proposed method is compared with neural network and the results reveal that SVSF is better in identifying nonlinear systems. View full abstract»

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  • Human guidance and supervision of a manufacturing system for semi-automated production

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1847 KB) |  | HTML iconHTML  

    Handcrafting is common in manufacturing processes, where human workers fulfill a central role regarding process knowledge and control, task complexity, fabrication techniques, and quality management. From an economic point of view, the handcrafting without any technical assistance allows manufacturing of products in an admissible quality range; however, the quality itself is strongly influenced by the skills of the human workers. Additionally, the repeatability of the product quality or the uniformity of the manually performed working steps throughout the manufacturing process is hard to keep in a reliable range. The dependency of human workers and the quality may cause defective products or increased manufacturing costs through corrective rebuilding, especially when skilled human employees are not available due to demographical reasons. The complexity of such kind of expertise-based manufacturing requires a detailed analysis of the manufacturing process in order to detect automatable sub-processes. Regarding human factor aspects on the one hand and economic goals on the other hand, the need of innovative production systems becomes clear. A separation of human workers and the process task by transferring the human worker to an operator role and by automatizing the quality related production sub-processes seems to be useful. As an illustrative example, the process analysis of a handcrafted molding process is performed. Thereby, the cast part quality is mainly influenced by the quality of the mold, which underlies individual fabrication variations due to an expertise-based handcrafted production process in a noxious environment common in this casting technology field. View full abstract»

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  • Scattering by PEMC elliptic cylinder loaded by metamaterial coating

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (814 KB) |  | HTML iconHTML  

    Exact analytic solution is presented to the problem of scattering by perfect electromagnetic conducting (PEMC) elliptic cylinder coated by metamaterial due to a plane wave illumination. The problem is formulated by expanding the various fields in terms of appropriate angular and radial Mathieu functions and a set of expansion coefficients. The expansion coefficients associated with the incident fields are known, where those associated with the fields inside and outside the coating are unknown. Imposing the boundary conditions at the surface of the elliptic cylinder and the surface of the coating leads to determination of the unknown expansion coefficients. Results are presented for the normalized scattering widths of elliptic cylinders with various sizes, PEMC admittances and different coatings, to show the effects of these on scattering. View full abstract»

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