Alexandria National Refining and Petrochemicals Co. ANRPC

Alexandria, Egypt

Alexandria National Refining and Petrochemicals Co. ANRPC

Alexandria, Egypt

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El-Gammal M.A.,Pharos University in Alexandria | Abou-Ghazala A.Y.,Alexandria University | El-Shennawy T.I.,Alexandria National Refining and Petrochemicals Co. ANRPC
International Journal on Electrical Engineering and Informatics | Year: 2011

The Dynamic Voltage Restorer (DVR) is fast, flexible and efficient solution to voltage sag problem. The DVR is a power electronic based device that provides three-phase controllable voltage source, whose voltage vector (magnitude and angle) adds to the source voltage during sag event, to restore the load voltage to pre-sag conditions. The DVR is designed for protecting the whole plant with loads in the range of some MVA. The DVR can restore the load voltage within few milliseconds. Several configurations and control methods are proposed for the DVR. In this paper, an overview of the DVR, its functions, configurations, components, compensating strategies and control methods are reviewed along with the device capabilities and limitations.


El-Gammal M.,Alexandria University | Abou-Ghazala A.,Alexandria University | El-Shennawy T.,Alexandria National Refining and Petrochemicals Co. ANRPC
Przeglad Elektrotechniczny | Year: 2010

The increased concern about the financial losses due to voltage sags and interruptions plus the advancements in power electronics technology have led to the innovation of very fast acting intervening equipment that can mitigate such disturbances. However, the high cost of these custom power devices can offset their technical benefits. In this paper, a procedure is proposed to find a compromised solution that makes technical and financial sense. A case study of an oil refinery in Alexandria, Egypt is considered to illustrate the proposed procedure.


El-Gammal M.,Alexandria University | Abou-Ghazala A.,Alexandria University | El-Shennawy T.,Alexandria National Refining and Petrochemicals Co. ANRPC
Journal of Electrical and Electronics Engineering | Year: 2010

The increased concern about the financial losses due to voltage sags and interruptions in addition to the advancements in power electronics technology have led to the innovation of very fast acting custom power devices that can mitigate such disturbances at the facility entrance. Although significant improvements in the overall power quality can be achieved, however, the high costs of these custom power devices can offset the benefits resulting from their application. The problem therefore, is one of finding a compromised solution that makes technical and financial sense. In this paper, the technical merits of the custom power devices are highlighted, along with their effectiveness in mitigating sags and/or interruptions. The costs of each application are financially analyzed together with a procedure for the decision maker to compare the payback or the revenue of investment in such devices. A case study of an oil refinery in Alexandria, Egypt is considered to illustrate the proposed procedure.


El-Gammal M.A.,Alexandria University | Abou-Ghazala A.Y.,Alexandria University | El-Shennawy T.I.,Alexandria National Refining and Petrochemicals Co. ANRPC
Iranian Journal of Electrical and Computer Engineering | Year: 2010

Voltage sags are voltage reduction events, followed by restoration of the normal supply conditions after a short duration. Induction Motors (IMs) constitute a large portion of the loads in industrial power systems. The loss of their service in a continuous process plant (like a refinery) may result in a costly shutdown. The basic observed effects of voltage sags on induction motors are speed loss and current and torque transients associated with both voltage reduction and recovery. This paper will focus on the response of the IMs to various parameters of voltage sags; including magnitude, duration, effect of pre-sag voltage, loading percentage, point on the wave of sag occurrence, source harmonics, and three-phase unbalance. Other objectives of this study are to investigate the motors ride through capability during different types of voltage sags, and to establish guidelines for adjusting the protection relays of the IMs. The industrial electrical distribution system of Alexandria National Refining and Petrochemicals Co. (ANRPC) is taken as a case study to investigate such effects through computer simulations using the MATLAB/SIMULINK® toolbox. Validity of the simulations is verified by actual performance. © 2010 ACECR.

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