@inproceedings{MTMT:34370130, title = {Optimized LFC Design for Future Low-Inertia Power Electronics Based Modern Power Grids}, url = {https://m2.mtmt.hu/api/publication/34370130}, author = {Aly, Mokhtar and Mohamed, Emad A. and Ramadan, Husam A. and Elmelegi, Ahmed and Mohamed, Sayed Mohamed Said and Ahmed, Emad M. and Shawky, Ahmed and Rodriguez, Jose}, booktitle = {2023 IEEE Conference on Power Electronics and Renewable Energy (CPERE)}, doi = {10.1109/CPERE56564.2023.10119568}, unique-id = {34370130}, abstract = {Numerous renewable energy source (RES) plants have lately been added to modern power grids. Power electronics converter systems (PECS) have become key components in the structures of these RESs for grid integration. However, PECS-based RESs result in decreased power system inertia, which reduces as penetration increases. Load frequency controllers (LFCs) have enhanced the performance of current power grids based on PECS. As a result, this study provides an optimal LFC structure based on merging characteristics from standard Tilt-Integral-Derivative (TID) and fractional order-based proportional-integral-derivative (FOPID) controllers in a novel combined FOTID LFC technique. The recently announced slime mould algorithm (SMA) was used to optimize the parameters of the proposed LFC. The results of a two-area RES-based power grid simulation are utilized to validate the proposed TFOID controller and the SMA-based design optimization.}, keywords = {Renewable energy sources; Fractional order control; power electronics converters; load frequency controller; Slime mould algorithm (SMA)}, year = {2023}, orcid-numbers = {Mohamed, Sayed Mohamed Said/0000-0002-3874-3171} } @article{MTMT:33426734, title = {Enhancement the Frequency Stability and Protection of Interconnected Microgrid Systems Using Advanced Hybrid Fractional Order Controller}, url = {https://m2.mtmt.hu/api/publication/33426734}, author = {Mohamed, Emad A. and Aly, Mokhtar and Elmelegi, Ahmed and Ahmed, Emad M. and Watanabe, Masayuki and Mohamed, Sayed Mohamed Said}, doi = {10.1109/ACCESS.2022.3216212}, journal-iso = {IEEE ACCESS}, journal = {IEEE ACCESS}, volume = {10}, unique-id = {33426734}, issn = {2169-3536}, abstract = {Substituting conventional energy sources with new renewable sources is crucial issue nowadays in energy generation systems to face climate changes and increased load demands. Due to the increased penetration levels of renewable sources in power systems, the benefits of the high-inertia of conventional sources are being insufficient. The resulting low-inertia power systems introduce several stability, reliability, and coordination problems for power system operation and control. Therefore, this paper tackles the coordination assessment and enhancement between digital frequency relays using a new fractional order load frequency controller equipped with superconducting magnetic energy storage (SMES) virtual inertia system. The improved coordination method is established using optimized fractional order controller based on slime mould optimization algorithm (SMA). The proposed SMA-based design method benefits the adaptive weights of SMA algorithm. The proposed design is generalized to be applied on single area and multi-area interconnected power systems as well. Compared to existing literature, this paper presents an advanced fractional order controller with coordinated operation with existing protection relays. The obtained results show the coordination shortcomings of renewable energy based microgrids with traditional control systems. However, improved design and coordination are obtained using the proposed SMA-optimized fractional order controllers. The superiority and feasibility of the proposed analysis and methods are verified on different case studies using single and multiple interconnected areas.}, keywords = {coordination; climate change; Control systems; Renewable energy sources; Microgrids; frequency control; superconducting magnetic energy storage; power system stability; power system stability; Slime mould algorithm (SMA); digital frequency relay; fraction order control; load frequency controllers; renewable energy microgrids}, year = {2022}, eissn = {2169-3536}, pages = {111936-111961}, orcid-numbers = {Aly, Mokhtar/0000-0002-9236-7840; Mohamed, Sayed Mohamed Said/0000-0002-3874-3171} } @mastersthesis{MTMT:32517150, title = {Improving power system reliability and stability by cooperation of distributed generation and energy storage system}, url = {https://m2.mtmt.hu/api/publication/32517150}, author = {Mohamed, Sayed Mohamed Said}, publisher = {Budapest University of Technology and Economics}, unique-id = {32517150}, year = {2021}, orcid-numbers = {Mohamed, Sayed Mohamed Said/0000-0002-3874-3171} } @article{MTMT:31903344, title = {Coordinated fuzzy logic-based virtual inertia controller and frequency relay scheme for reliable operation of low-inertia power system}, url = {https://m2.mtmt.hu/api/publication/31903344}, author = {Mohamed, Sayed Mohamed Said and Aly, Mokhtar and Hartmann, Bálint and Mohamed, Emad A}, doi = {10.1049/rpg2.12106}, journal-iso = {IET RENEW POWER GEN}, journal = {IET RENEWABLE POWER GENERATION}, volume = {15}, unique-id = {31903344}, issn = {1752-1416}, abstract = {Coordination between protection and control devices is crucial for maintaining continuous operation of power systems. Existing strategies suffer from improper coordination of control and protection devices. Moreover, high penetration levels of renewable energy sources result in lowering the overall power system inertia. Therefore, this paper presents a robust fuzzy-logic control (FLC) method for superconducting magnetic energy storage (SMES) in low inertia power systems. The new proposed FLC enables robust and wide operating range for SMES compared to the widely employed controllers. The proposed FLC method and load frequency control are coordinated to emulate virtual inertia. In addition, a cooperate coordination between frequency relay and proposed controller is preserved to maintain reliable operation of low inertia power systems. To prove the effectiveness of proposed coordination strategy, it has been tested with considering different load and renewable energy sources (RESs) disturbances with varying inertia level of the selected case study. The results demonstrate that the proposed FLC method can achieve robust SMES operation as virtual inertia controller (VIC) at wide operating range. Moreover, cooperative operation of VIC and frequency protection is preserved using the proposed coordination strategy. The power system availability, frequency regulation, and dynamic stability are improved using the proposed method.}, year = {2021}, eissn = {1752-1424}, pages = {1286-1300}, orcid-numbers = {Mohamed, Sayed Mohamed Said/0000-0002-3874-3171} } @article{MTMT:31638861, title = {An Efficient Reactive Power Dispatch Method for Hybrid Photovoltaic and Superconducting Magnetic Energy Storage Inverters in Utility Grids}, url = {https://m2.mtmt.hu/api/publication/31638861}, author = {Mohamed, Sayed Mohamed Said and Aly, Mokhtar and Hartmann, Bálint}, doi = {10.1109/ACCESS.2020.3029326}, journal-iso = {IEEE ACCESS}, journal = {IEEE ACCESS}, volume = {8}, unique-id = {31638861}, issn = {2169-3536}, year = {2020}, eissn = {2169-3536}, pages = {183708-183721}, orcid-numbers = {Mohamed, Sayed Mohamed Said/0000-0002-3874-3171} } @article{MTMT:31611328, title = {Tie-line Power Flow Control Method for Grid-connected Microgrids with SMES Based on Optimization and Fuzzy Logic}, url = {https://m2.mtmt.hu/api/publication/31611328}, author = {Mohamed, Sayed Mohamed Said and Ali, Abdelfatah and Hartmann, Bálint}, doi = {10.35833/MPCE.2019.000282}, journal-iso = {J MODERN POWER SYSTEMS CLEAN ENERGY}, journal = {JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY}, volume = {8}, unique-id = {31611328}, issn = {2196-5625}, year = {2020}, eissn = {2196-5420}, pages = {941-950}, orcid-numbers = {Mohamed, Sayed Mohamed Said/0000-0002-3874-3171} } @inproceedings{MTMT:31274610, title = {Voltage Control of Large-Scale Distribution Systems during Wind Speed Transients Using SMES}, url = {https://m2.mtmt.hu/api/publication/31274610}, author = {Mohamed, Sayed Mohamed Said and Aly, Mohamed M. and Abdel-Akher, Mamdouh and Hartmann, Bálint}, booktitle = {2020 International Conference on Innovative Trends in Communication and Computer Engineering (ITCE)}, doi = {10.1109/ITCE48509.2020.9047794}, unique-id = {31274610}, abstract = {This paper discusses the application of superconducting magnetic energy storage (SMES) for voltage control of large-scale distribution systems during wind speed transients. The wind turbine adopted in this paper is the squirrel cage induction generator (SCIG) with a parallel connected capacitor bank for reactive power support and the adopted distribution system is the 90-bus radial distribution system. This type of wind turbine is the worst type from the point of view of voltage control and is selected to prove the effectiveness of the proposed control strategy of SMES active and reactive powers on the voltage profile of all buses of the distribution system. Moreover, one of the worst scenarios of wind transient is studied in this paper. Wind energy generation system (WEGS) and SMES are connected at the same bus for better improvement of voltage profile. SMES coil is immersed in a cooling liquid to keep it in the superconducting state, the voltage across the coil is stepped down by transformer and the flow of SMES power is controlled by fuzzy logic controller (FLC). FLC is designed so that SMES can charge/discharge real power depending on the wind speed. Moreover, value of reactive power delivered from the SMES to the distribution system is controlled according to the magnitude of bus voltage. FLC is designed with two inputs; deviation in wind speed and variations in SMES current. The obtained results validated the adopted control technique to improve the voltage profile of all buses of the studied system.}, keywords = {Fuzzy logic controller; Wind energy generation system; superconducting magnetic energy storage; Squirrel Cage Induction Generator; Wind speed transients}, year = {2020}, pages = {391-396}, orcid-numbers = {Mohamed, Sayed Mohamed Said/0000-0002-3874-3171} } @inproceedings{MTMT:31274597, title = {Enhancement of Microgrid Stability Using a Novel Scheme of Load Shedding Based-DFR Coordinated with SMES}, url = {https://m2.mtmt.hu/api/publication/31274597}, author = {Mohamed, Sayed Mohamed Said and Mohamed, Emad A. and Hartmann, Bálint}, booktitle = {2020 International Conference on Innovative Trends in Communication and Computer Engineering (ITCE)}, doi = {10.1109/ITCE48509.2020.9047759}, unique-id = {31274597}, year = {2020}, pages = {359-364}, orcid-numbers = {Mohamed, Sayed Mohamed Said/0000-0002-3874-3171} } @article{MTMT:31189630, title = {Power System Improvement of Different Coordinated Electric Vehicles Integration Approaches with Superconducting Magnetic Energy Storage}, url = {https://m2.mtmt.hu/api/publication/31189630}, author = {Salama, Hossam Salah Hussein and Mohamed, Sayed Mohamed Said and Vokony, István and Hartmann, Bálint}, doi = {10.15866/iree.v14i6.17315}, journal-iso = {INT REV ELECTR ENG}, journal = {INTERNATIONAL REVIEW OF ELECTRICAL ENGINEERING}, volume = {14}, unique-id = {31189630}, issn = {1827-6660}, year = {2019}, pages = {407}, orcid-numbers = {Mohamed, Sayed Mohamed Said/0000-0002-3874-3171} } @inproceedings{MTMT:31178139, title = {Analysis and Comparison of SMES Device Power Losses Considering Various Load Conditions}, url = {https://m2.mtmt.hu/api/publication/31178139}, author = {Mohamed, Sayed Mohamed Said and Aly, Mokhtar and Mohamed, Emad A. and Hartmann, Bálint}, booktitle = {2019 IEEE Conference on Power Electronics and Renewable Energy (CPERE)}, doi = {10.1109/CPERE45374.2019.8980205}, unique-id = {31178139}, year = {2019}, pages = {1-5}, orcid-numbers = {Mohamed, Sayed Mohamed Said/0000-0002-3874-3171} }