International Journal of Engineering Research

Hala S. Khalil ¹, Khaled N. Faris ¹

Affiliations
1 Power Electronics and Energy Conversion Department, Electronics Research Institute, Dokki, Giza, EG

Abstract

Ultracapacitors (UCs) are characterized by its high power storage capacity, Low Equivalent Series Resistance (ESR) which leads to an efficient high charging / discharging currentat a wide range of operating temperatures. UCs are successfully utilized as a supplementary energy sources for electric vehicles (EVs). According to their high power densities they are adopted to operate in quick acceleration, hill-climbing and regenerative braking. So they have been considered for transient power supply and recovery in EVs. An UC-battery combination system can effectively smooth the power fluctuation caused by periodic acceleration and deceleration for different driving cycles. In this paper, the performance characterization of an UC is recorded including measuring the capacitance, equivalent series resistance and the output terminal voltage. The characterization is verified experimentally at different loading conditions in order to model the performance of the UC under different loading and operating conditions. A simplified Fuzzy modelling technique is adopted for capacitance estimation based on the charging/discharging currents and the surrounding temperature. The estimated capacitance from the fuzzy model is very close to the actual value that proofs the high efficiency of the proposed model. The ESR, terminal voltage, and SOC are estimated from the introduced model. The available charge after charging or discharging is estimated based on the estimated terminal voltage and capacitance.

Keywords

Ultra-Capacitor, Characterization, Modelling, Electric Vehicle.

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Khaled N. Faris ¹, Hala S. Khalil ¹, Mohsen M. T. EL-Hagry ¹

Affiliations
1 Power Electronics and Energy Conversion Dept., Electronics Research Institute, Tahrir Street, Dokki, Giza, EG

Abstract

The Continuous Advances in Power electronics technologies and regulation systems have provided an opportunity for designing of efficient Converters for charging process of storage elements, especially in photovoltaic (PV) systems, these converters must have a minimum ripples contents, this can be achieved by using advanced multiphase interleaved DC/DC converters. These converters are used to regulate the output voltage and current of the PV - charging system to obtain an efficient charging /discharging process for direct Energy Storage Systems (ESS), also control the power flow and track the maximum power of the PV modules. In this paper, a design and implementation of a multi-phase interleaved Buck DC/DC converter is introduced for obtaining an efficient PV Battery charging system. Also a comparison between the conventional single phase and the proposed multi-phase interleaved topology is recorded.

Keywords

Buck Converter, Interleave Topology, Ripples Reduction, PV Systems.

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Khaled N. Faris ¹, Hala S. Khalil ¹, Khaled S. Sakkoury ¹

Affiliations
1 Power Electronics and Energy Conversion Department, Electronics Research Institute, Dokki, Giza, EG

Abstract

According to various advantages of linear induction motor (LIM), such as high starting thrust force, high speed operation and reduction of mechanical losses, more applications have utilized this type of motors. Direct Thrust Control (DTC) technique is considered as one of the most efficient techniques that can be used for LIM. DTC is preferable to give a fast and good dynamic thrust response. So, to improve the accuracy and robustness of contouring control for CNC machine tools, linear induction motors with a direct thrust control technique are introduced for driving these machines. An industry standard motion control system is applied for reducing the tracking error and improving the desired accuracy. Different loading conditions are simulated to validate the reliability and robustness of the introduced system to match the application field. The proposed system is simulated using the MATLAB/SIMULINK Package; simulation results validated both tracking accuracy and robustness of the proposed motion control system for contouring control for a CNC (Computer Numerical Control) milling machine.

Keywords

Linear Induction Motor (LIM), Direct Thrust Control (DTC), Modified-Industry Standard Digital Motion Control System (MISDMCS), Contouring Control, CNC-Milling Machine.

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