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Mohamed Sharaf, H., H. H. Zeineldin, D. K. Ibrahim, and E. E. L. - D. A. EL-Zahab, "Directional Inverse Time Overcurrent Relay for Meshed Distribution Systems with Distributed Generation with Additional Continuous Relay Settings", 12th International Conference on Developments in Power System Protection, IET, Copenhagen, IET, 2014. Abstract

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Mostafa, S. A. E. A., D. K. Ibrahim, and E. E. - D. A. El-Zahab, "Directional Overcurrent Relays Coordination Restoration By Reducing Minimum Fault Current Limiter Impedance", Proceedings of the 15th International Middle East Power Systems Conference, MEPCON , Alexandria, Egypt, 2012. Abstract

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Mostafa, S. A. E. A., D. K. Ibrahim, and E. E. - D. A. El-Zahab, "Directional Overcurrent Relays Coordination Restoration By Reducing Minimum Fault Current Limiter Impedance", Journal of Energy and Power Engineering, vol. 8, pp. 1132 - 1141, 2014. Abstract

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Yousef, W. H., D. K. Ibrahim, and E. Abo El-Zahab, "Discrimination of Internal Faults and Inrush Currents For Large Modern Power Transformer", Proceedings of 14th International Middle East Power Systems Conference (MEPCON 2010), Cairo, Egypt, 2010. Abstract

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Alham, M. H., M. Elshahed, D. K. Ibrahim, and E. E. D. A. El Zahab, "A dynamic economic emission dispatch considering wind power uncertainty incorporating energy storage system and demand side management", Renewable Energy, vol. 96: Pergamon, pp. 800 - 811, 2016. Abstract

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Abo-Hamad, G. M., D. K. Ibrahim, E. A. M. Zahab, and A. F. Zobaa, "Dynamic Quadrilateral Characteristic-Based Distance Relays for Transmission Lines Equipped with TCSC", Energies , vol. 14, issue 21, pp. Article 7074, 2021. Abstract

A two-fold adaptive dynamic quadrilateral relay is developed in this research for protecting Thyristor-Controlled Series Compensator (TCSC)-compensated transmission lines (TLs). By investigating a new tilt angle and modifying the Takagi method to recognize the fault zone identifier, the proposed relay adapts its reactive reach and resistive reach separately and independently. The investigated tilt angle and identified fault zone use the TCSC reactance to compensate its effect on the TL parameters and system homogeneity. Excessive tests are simulated by MATLAB on the non-homogenous network, IEEE-9 bus system and further tests are carried out on IEEE-39 bus system in order to generalize and validate the efficiency of the proposed approach. The designed trip boundaries are able to detect wide range of resistive faults under all TCSC modes of operations. The proposed approach is easy to implement as there no need for data synchronization or a high level of computation and filtration. Moreover, the proposed adaptive dynamic relay can be applied for non-homogeneity systems and short as well as long TLs which are either TCSC-compensated or -uncompensated TLs.

Omar, A. I., Z. M. Ali, S. A. H. E. Aleem, E. E. M. Abou-El-Zahab, and A. M. Sharaf, "A Dynamic Switched Compensation Scheme for Grid-Connected Wind Energy Systems Using Cuckoo Search Algorithm", International Journal on Energy Conversion (IRECON), vol. 7, issue 2, pp. 64-74, 2019. Abstract

This paper presents a novel stabilization FACTS-based scheme that acts as a switched compensator for grid-connected wind energy systems. It is a member of a family of devices and switched dynamic voltage stabilization converters that were developed to ensure minimal loss of excitation, voltage stabilization, energy efficient utilization, power quality enhancement and harmonic distortion reduction in AC distribution grid networks. A novel-dual action distributed FACTS based–switched power filter compensator (SPFC) scheme is developed for efficient utilization of wind energy under varying wind conditions and major load excursions. A dynamic multi-level error-driven decoupled time de-scaled multi regulation control strategy is used to guarantee better power quality performance in terms of voltage enhancement and stabilization of the AC buses, improvement of power factor, and harmonic distortion reduction. The proposed SPFC was controlled using an inter-coupled weighted modified proportional-integral-derivative (WM-PID) controller. Cuckoo search (CS) optimization algorithm is employed to get the PID controller gains in terms of variations and excursions in wind speed and dynamic load excursions to reflect the performance of the compensator scheme. The effectiveness of the proposed SPFC with the multi-level control strategy has been assessed by time-domain simulations in Matlab/Simulink environment. The results obtained show the robustness of the proposed topology.

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