@article{MTMT:33733423,
	title = {Integration of Wind Systems with SVC and STATCOM during Various Events to Achieve FRT Capability and Voltage Stability: Towards the Reliability of Modern Power Systems},
	url = {https://m2.mtmt.hu/api/publication/33733423},
	author = {Mahmoud, Mohamed Metwally and Salama, Hossam Salah Hussein and Bajaj, Mohit and Aly, Mohamed M. and Vokony, István and Bukhari, Syed Sabir Hussain and Wapet, Daniel Eutyche Mbadjoun and Abdel-Rahim, Abdel-Moamen M.},
	doi = {10.1155/2023/8738460},
	journal-iso = {INT J ENERG RES},
	journal = {INTERNATIONAL JOURNAL OF ENERGY RESEARCH},
	volume = {2023},
	unique-id = {33733423},
	issn = {0363-907X},
	abstract = {FACTS tools in modern power systems provide a vital solution to the problems of voltage deviation and fault ride-through (FRT) capability in electrical power systems especially during the integration of wind power. Many distinct journals highlight that the wind-driven squirrel cage generator (SCIG) still accounts for around 15% of operating wind generators so far. To enhance voltage stability and FRT capacity, this paper recommends a cost-effective static VAR compensator (SVC) which has a size rating of six MVAR, and this improves the efficiency of the electrical power system. Different events are considered in this study such as high turbulent wind speed, low turbulent wind speed, unsymmetrical faults, and symmetrical faults to validate the suggested option. Moreover, the suggested solution is compared with the static synchronous compensator (STATCOM) and a fixed capacitor to ensure that during the studied wind speed profiles and faults, voltage stability, reactive power consumption, and FRT capability are realized. An overall comparison among them is performed under all studied scenarios to summarize their benefits and impacts. The simulated results show the effectiveness and superiority of SVC in improving the operation of an integrated wind system based on a grid-linked SCIG and the performance of the power system. The modeling of SCIG, SVC, and STATCOM is designed by MATLAB/Simulink toolbox.},
	keywords = {BEHAVIOR; QUALITY; IMPROVEMENT; STRATEGIES; Turbines; FARMS; CHALLENGES; Energy & Fuels; LVRT; FIXED-SPEED},
	year = {2023},
	eissn = {1099-114X},
	orcid-numbers = {Bajaj, Mohit/0000-0002-1086-457X}
}

@article{MTMT:33284209,
	title = {The Role of Hybrid Battery–SMES Energy Storage in Enriching the Permanence of PV–Wind DC Microgrids: A Case Study},
	url = {https://m2.mtmt.hu/api/publication/33284209},
	author = {Salama, Hossam Salah Hussein and Kotb Baldam, Kotb Mohamed and Vokony, István and Dán, András},
	doi = {10.3390/eng3020016},
	journal-iso = {ENG},
	journal = {ENG},
	volume = {3},
	unique-id = {33284209},
	abstract = {The superior access to renewable sources in modern power systems increases the fluctuations in system voltage and power. Additionally, the central dilemmas in using renewable energy sources (RESs) are the intermittent nature of and dependence on wind speed and solar irradiance for wind and photovoltaic (PV) systems, respectively. Therefore, utilizing a vigorous and effective energy storage system (ESS) with RESs is crucial to overcoming such challenges and dilemmas. This paper describes the impacts of using a battery storage system (BSS) and superconducting magnetic energy storage (SMES) system on a DC bus microgrid-integrated hybrid solar–wind system. The proposed method employs a combination of BSS and SMES to improve the microgrid stability during different events, such as wind variation, shadow, wind turbine (WT) connection, and sudden PV outage events. Distinct control approaches are proposed to control the system’s different components in order to increase overall system stability and power exchange. Both the PV and wind systems are further equipped with unique maximum power point tracking (MPPT) controllers. Additionally, each of the ESSs is controlled using a proposed control method to supervise the interchange of the active power within the system and to keep the DC bus voltage constant during the different examined instabilities. Furthermore, to maintain the load voltage /frequency constant, the prime inverter is controlled using the proposed inverter control unit. The simulation results performed with Matlab/Simulink show that the hybrid BSS + SMES system successfully achieves the main targets, i.e., DC voltage, interchange power, and load voltage/frequency are improved and smoothed out. Moreover, a comparison among three case studies is presented, namely without using ESSs, using the BSS only, and once more using both BSS and SMES systems. The findings prove the efficacy of the proposed control method based on the hybrid BSS + SMES approach over BSS only in preserving the modern power system’s stability and reliability during the variable events.},
	year = {2022},
	eissn = {2673-4117},
	pages = {207-223}
}

@article{MTMT:33095020,
	title = {Adaptive coordination control strategy of renewable energy sources, hydrogen production unit, and fuel cell for frequency regulation of a hybrid distributed power system},
	url = {https://m2.mtmt.hu/api/publication/33095020},
	author = {Salama, Hossam Salah Hussein and Magdy, Gaber and Bakeer, Abualkasim and Vokony, István},
	doi = {10.1186/s41601-022-00258-7},
	journal-iso = {PROT CONTROL MODERN POWER SYST},
	journal = {PROTECTION AND CONTROL OF MODERN POWER SYSTEMS},
	volume = {7},
	unique-id = {33095020},
	issn = {2367-2617},
	abstract = {Owing to the significant number of hybrid generation systems (HGSs) containing various energy sources, coordination between these sources plays a vital role in preserving frequency stability. In this paper, an adaptive coordination control strategy for renewable energy sources (RESs), an aqua electrolyzer (AE) for hydrogen production, and a fuel cell (FC)-based energy storage system (ESS) is proposed to enhance the frequency stability of an HGS. In the proposed system, the excess energy from RESs is used to power electrolysis via an AE for hydrogen energy storage in FCs. The proposed method is based on a proportional-integral (PI) controller, which is optimally designed using a grey wolf optimization (GWO) algorithm to estimate the surplus energy from RESs (i.e., a proportion of total power generation of RESs: Kn). The studied HGS contains various types of generation systems including a diesel generator, wind turbines, photovoltaic (PV) systems, AE with FCs, and ESSs (e.g., battery and flywheel). The proposed method varies Kn with varying frequency deviation values to obtain the best benefits from RESs, while damping the frequency fluctuations. The proposed method is validated by considering different loading conditions and comparing with other existing studies that consider Kn as a constant value. The simulation results demonstrate that the proposed method, which changes Kn value and subsequently stores the power extracted from the RESs in hydrogen energy storage according to frequency deviation changes, performs better than those that use constant Kn. The statistical analysis for frequency deviation of HGS with the proposed method has the best values and achieves large improvements for minimum, maximum, difference between maximum and minimum, mean, and standard deviation compared to the existing method.},
	keywords = {fuel cell; Renewable energy sources; BATTERY; RESOURCES; Energy & Fuels; Adaptive coordination control method; Grey wolf optimization (GWO) algorithm; Fraction factor (Kn)},
	year = {2022},
	eissn = {2367-0983}
}

@article{MTMT:33091411,
	title = {Comparative Analysis of a DC-microgrid Incorporating Hybrid Battery/Supercapacitor Storage System Addressing Pulse Load},
	url = {https://m2.mtmt.hu/api/publication/33091411},
	author = {Salama, Hossam Salah Hussein and Kotb Baldam, Kotb Mohamed and Vokony, István and Dán, András},
	doi = {10.24084/repqj20.310},
	journal-iso = {RENEWABLE ENERGY & POWER QUALITY J},
	journal = {RENEWABLE ENERGY & POWER QUALITY JOURNAL},
	volume = {20},
	unique-id = {33091411},
	year = {2022},
	eissn = {2172-038X},
	pages = {359-363}
}

@article{MTMT:33087497,
	title = {Spatial Aggregation of Local Flexibility – Horizon2020 project experiences},
	url = {https://m2.mtmt.hu/api/publication/33087497},
	author = {Vokony, István and Salama, Hossam Salah Hussein and Barancsuk, Lilla and Sőrés, Péter Márk},
	doi = {10.24084/repqj20.377},
	journal-iso = {RENEWABLE ENERGY & POWER QUALITY J},
	journal = {RENEWABLE ENERGY & POWER QUALITY JOURNAL},
	volume = {20},
	unique-id = {33087497},
	abstract = {With the growth of renewables, the increased interconnection of European grids, the development of local energy initiatives, and the specific requirements on TSO–DSO cooperation as set forth in the different Network Codes and Guidelines, TSOs and DSOs face new challenges that will require greater coordination. The aforementioned measures encourage procurement of services at both the transmission and the distribution level, recognizing that this will enable more efficient and effective network management and will increase the level of demand response and the capacity of renewable generation. Digitalization is a key driver for coordination and active system management in the electricity grid, enabling TSOs and DSOs to optimize the use of distributed resources and ensure a costeffective and secure supply of electricity. It also empowers endusers to become active market participants, supporting selfgeneration and providing demand flexibility. To support the transformation, the INTERRFACE project, started in 2019, will design, develop and exploit an Interoperable pan-European Grid Services Architecture (IEGSA) to act as the interface between the power system (TSO and DSO – transmission system operator, distribution system operator) and the customers, and allow the seamless and coordinated operation of all stakeholders to use and procure common services. This paper describes the approach of one INTERRFACE demonstration, the spatial aggregation of local flexibility and its realization that contributes providing a clear market approach to include local constraints into the already well-established and working wholesale energy market solutions},
	year = {2022},
	eissn = {2172-038X},
	pages = {596-601}
}

@article{MTMT:33067620,
	title = {P2P local market concept whith dynamic network usage tariff vi asset enablement – Horizon2020 project demo experiences},
	url = {https://m2.mtmt.hu/api/publication/33067620},
	author = {Vokony, István and Salama, Hossam Salah Hussein and Barancsuk, Lilla and Sinkovics, Bálint and Sőrés, Péter Márk and Hartmann, Bálint and Táczi, István},
	doi = {10.24084/repqj20.376},
	journal-iso = {RENEWABLE ENERGY & POWER QUALITY J},
	journal = {RENEWABLE ENERGY & POWER QUALITY JOURNAL},
	volume = {20},
	unique-id = {33067620},
	abstract = {With the growth of renewables, the increased interconnection of European grids, the development of local energy initiatives, and the specific requirements on transmission system operator (TSO) – distribution system operator (DSO) cooperation as set forth in the different Network Codes and Guidelines, TSOs and DSOs face new challenges that will require greater coordination. The European Commission adopted legislative proposals on the energy market that promote cooperation among network operators as they procure balancing and other ancillary services and provide congestion management. Therefore, this creates the need for a specific project such as the H2020 INTERRFACE project, having the greater coordination between TSOs and DSOs as its core objective. In this project, one of the demonstrations is a local asset-enabled energy market to provide data-driven, simulation-based results, with a realistic market setting. There the transactions beneficial for the distribution grid are facilitated via dynamic pricing (DNUT – dynamic network usage tariff). In the demonstration of a local market that runs based on data, provided from 3 sites (2 Hungarian, 1 Slovenian), local distribution system operators are involved to provide grid and consumption/production data. This paper discusses the first results from one demonstration site, which contribute to the development of local P2P markets. It also facilitates the introduction of grid calculation based dynamic tariffs by providing practical results from the cooperation of research entities and DSOs in the H2020 INTERRFACE project.},
	year = {2022},
	eissn = {2172-038X},
	pages = {590-595},
	orcid-numbers = {Táczi, István/0000-0002-0835-0481}
}

@mastersthesis{MTMT:32923853,
	title = {Applications of energy storage to improve performance of utility grids in presence of renewable energies and electric vehicles},
	url = {https://m2.mtmt.hu/api/publication/32923853},
	author = {Salama, Hossam Salah Hussein},
	publisher = {Budapest University of Technology and Economics},
	unique-id = {32923853},
	year = {2022}
}

@article{MTMT:32617879,
	title = {Voltage stability indices–A comparison and a review},
	url = {https://m2.mtmt.hu/api/publication/32617879},
	author = {Salama, Hossam Salah Hussein and Vokony, István},
	doi = {10.1016/j.compeleceng.2022.107743},
	journal-iso = {COMPUT ELECTR ENG},
	journal = {COMPUTERS & ELECTRICAL ENGINEERING},
	volume = {98},
	unique-id = {32617879},
	issn = {0045-7906},
	abstract = {The increasing integration of renewable energy sources (RESs) into the power system, rapid load changes, and increasing power demand create problems for the stability of power systems. Therefore, the voltage stability index (VSI) becomes an important indicator of power system stability. This paper provides a comprehensive overview of most VSIs and a wealth of resources for researchers, students, and employers. For each VSI, list data such as name, abbreviation, calculation method, assumptions, the basic concept, steady-state, threshold, instability, pros, and cons are discussed in detail. Also, the paper describes the relationship between RESs, load changes, and VSI, and it investigates the stability issues of the power system. The significant outcome of this comprehensive review is to provide a good foundation for future work in this field and helps professionals to choose the best VSI that meets their needs for various applications.},
	year = {2022},
	eissn = {1879-0755}
}

@article{MTMT:32550297,
	title = {Enriching the stability of solar/wind DC microgrids using battery and superconducting magnetic energy storage based fuzzy logic control},
	url = {https://m2.mtmt.hu/api/publication/32550297},
	author = {Kotb Baldam, Kotb Mohamed and Elmorshedy, Mahmoud F. and Salama, Hossam Salah Hussein and Dán, András},
	doi = {10.1016/j.est.2021.103751},
	journal-iso = {J ENERGY STORAGE},
	journal = {JOURNAL OF ENERGY STORAGE},
	volume = {45},
	unique-id = {32550297},
	issn = {2352-152X},
	abstract = {Utilizing robustly-controlled energy storage technologies performs a substantial role in improving the stability of standalone microgrids in terms of voltages and powers. The majority of investigations focused less on integrating energy storage systems (especially superconducting magnetic energy storage 'SMES') within DC-bus microgrids. Besides, implementing fuzzy logic control (FLC) for both batteries and SMES within the DC-bus microgrids to enrich their stability and power quality under extreme climatic and loading variations has been seldomly addressed. Consequently, this paper introduces a comparative analysis of the performance of a hybrid renewable PV/wind DC-bus microgrid that separately implements fuzzy-controlled battery and SMES systems to enhance the microgrid stability and power quality. The proposed FLC approaches supervise energy interchange inside the system, mitigate the DC-bus voltage fluctuations, and smooth out the load power during the different instabilities. The system is examined under distinct normal and extreme climatic fluctuations such as wind gusts and rapid shadow and under sudden balanced and unbalanced loading events. The proposed FLC approaches are established based on quantifying the DC-bus voltage variation and measuring the actual battery and SMES currents which can be employed directly for the control action; hence, reducing both calculations/calibrations and complexity of the control system. Besides, they offer very quick charging/discharging actions for both battery and SMES systems to mitigate unexpected and rapid variations efficiently. For the load side, the study proposes a variable modulation index control based-sinusoidal pulse width modulation for controlling the prime inverter to preserve the load voltage and frequency constant during both balanced and unbalanced loading and extreme climatic disturbances. The obtained findings confirmed the efficacy of the proposed approaches in enriching the microgrid stability. Besides, they unveiled the magnificent performance of SMES over batteries regarding the response time, peak over- and undershoot, load voltage profile, and load power smoothness.},
	year = {2022},
	eissn = {2352-1538}
}

@article{MTMT:32541455,
	title = {An internal parallel capacitor control strategy for DC-link voltage stabilization of PMSG-based wind turbine under various fault conditions},
	url = {https://m2.mtmt.hu/api/publication/32541455},
	author = {Mahmoud, Mohamed Metwally and Aly, Mohamed M. and Salama, Hossam Salah Hussein and Abdel-Rahim, Abdel-Moamen M.},
	doi = {10.1177/0309524X211060684},
	journal-iso = {WIND ENG},
	journal = {WIND ENGINEERING},
	volume = {46},
	unique-id = {32541455},
	issn = {0309-524X},
	abstract = {In recent years, wind energy conversion systems (WECSs) have been growing rapidly. Due to various advantages, a permanent magnet synchronous generator (PMSG) is an appealing solution among different types of wind generators. As wind power penetration level in the grid increases, wind power impacts the grid and vice versa. The most essential concerns in the system are voltage sag and swell, and grid code compliance, particularly for low voltage ride-through (LVRT) and high voltage ride-through (HVRT) capability, is a pressing necessity. This paper presents a parallel capacitor (PC) control strategy to enhance the LVRT and HVRT capability of PMSG. Furthermore, this study presents a method for the sizing of a PC system for the reduction of the overvoltage of the DC-link during voltage sags and swell. Fast Fourier transform analysis is used to determine the total harmonic distortion (THD) for the injected current into the grid. The obtained results illustrate the effectiveness of the proposed system in keeping the DC-link voltage below the limit, power quality improvement, and increasing the LVRT and HVRT capability. Models of wind turbine, PMSG, and PC control system are built using MATLAB/SIMULINK software.},
	keywords = {Total harmonic distortion; voltage dip; DC-link voltage; permanent magnet synchronous generator; parallel capacitor sizing; voltage swell; SUPERCAPACITOR ENERGY-STORAGE},
	year = {2022},
	eissn = {2048-402X},
	pages = {983-992}
}