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Fifteen Years Of The Dynamic Voltage Restorer: A Literature Review, Tarek Ibrahim Elshennawy Dr., Amr Yehia Abou-Ghazala A. Prof., Mahmoud El-Gammal Prof.
Fifteen Years Of The Dynamic Voltage Restorer: A Literature Review, Tarek Ibrahim Elshennawy Dr., Amr Yehia Abou-Ghazala A. Prof., Mahmoud El-Gammal Prof.
Tarek Ibrahim ElShennawy
The dynamic voltage restorer (DVR) is a power electronic based device that is used to boost the voltage supplied to the sensitive loads during voltage sags. A DVR consists of an energy storage unit, a voltage source converter, a filter, a coupling transformer and fi nally the controller system. From its fi rst unit installed in 1996, several confi gurations, compensation strategies and controllers have been presented in literature, aiming at fast response, accurate compensation and low costs. In this paper, a literature review is presented scanning the most important contributions in this topic.
Dynamic Voltage Restorer (Dvr) For Voltage Sag Mitigation, Tarek Ibrahim Elshennawy, Amr Yehia Abou-Ghazala A. Prof., Mahmoud El-Gammal Prof.
Dynamic Voltage Restorer (Dvr) For Voltage Sag Mitigation, Tarek Ibrahim Elshennawy, Amr Yehia Abou-Ghazala A. Prof., Mahmoud El-Gammal Prof.
Tarek Ibrahim ElShennawy
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, …
Custom Power Devices For Voltage Sags Mitigation: A Techno-Economic Analysis, Tarek Ibrahim Elshennawy Dr., Amr Yehia Abou-Ghazala A. Prof., Mahmoud El-Gammal Prof.
Custom Power Devices For Voltage Sags Mitigation: A Techno-Economic Analysis, Tarek Ibrahim Elshennawy Dr., Amr Yehia Abou-Ghazala A. Prof., Mahmoud El-Gammal Prof.
Tarek Ibrahim ElShennawy
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.
Voltage Sag Effects On A Refinery With Induction Motors Loads, Tarek Ibrahim Elshennawy Dr., Amr Yehia Abou-Ghazala A. Prof., Mahmoud El-Gammal Prof.
Voltage Sag Effects On A Refinery With Induction Motors Loads, Tarek Ibrahim Elshennawy Dr., Amr Yehia Abou-Ghazala A. Prof., Mahmoud El-Gammal Prof.
Tarek Ibrahim ElShennawy
Process continuity of industrial plants (like a refinery) is subjected to several shutdowns due to voltage sags causing large induction motors (IM) to trip. In this paper, the response of induction motors to voltage sags is investigated through computer simulations using the MATLAB/SIMULINK toolbox. The simulations are verified by actual performance. The basic observed effects of voltage sags on IM are speed loss and current and torque transients associated with both voltage reduction and recovery. Results have also showed that three-phase voltage sags and sags occurring at zero crossing are the most severe events. Transient currents occurring at the instants …
Detection, Localization, And Classification Of Power Quality Disturbances Using Discrete Wavelet Transform Technique, Tarek Ibrahim Elshennawy Dr., Amr Yehia Abou-Ghazala A. Prof., Mahmoud El-Gammal Prof.
Detection, Localization, And Classification Of Power Quality Disturbances Using Discrete Wavelet Transform Technique, Tarek Ibrahim Elshennawy Dr., Amr Yehia Abou-Ghazala A. Prof., Mahmoud El-Gammal Prof.
Tarek Ibrahim ElShennawy
Modern spectral and harmonic analysis is based on Fourier based transforms. However, these techniques are less efficient in tracking the signal dynamics for transient disturbances. Consequently, The wavelet transform has been introduced as an adaptable technique for non-stationary signal analysis. Although the application of wavelets in the area of power engineering is still relatively new, it is evolving very rapidly. The application of the wavelet transform in detection, time localization, and classification of power quality disturbances is investigated and a new identification procedure is presented. Different power quality disturbances will be classified by a unique energy distribution pattern based on …