Mohamed EL-Shimy

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• PhD
• Professor (Full) at Ain Shams University

The transient stability of power systems is highly affected by the changes in the power generation and load levels. Due to the variability of the generating resources, the system stability can be provoked and the system stability limits can be reached as a result of certain sudden drop in the power generation. In these cases, the load shedding can...

There is an urgent need for constructing adequately accurate standard reduced order models of various renewable sources for fast assessment of the stability and security of power grids. This paper focuses on this theme considering solar photovoltaic generators (SPVGs). The main objectives of the paper include the construction of a valid reduced ord...

The integration of renewable energy technologies in power systems causes a significant change in the electromechanical, and electromagnetic properties of the hosting systems. Consequently, the overall steady state, and dynamic performances of power systems are altered due to the presence of these technologies. Therefore, the conclusions derived fro...

Preface This book presents updated scientific issues, and future plans related to energy production technologies, and energy systems. The book focuses on the electrical energy. It includes selected topics that cover the following sections: 1. Energy technologies and production studies, 2. Energy security and optimization, 3. Stability of electric...

Recently, solar power generation is significantly contributed to growing renewable sources of electricity all over the world. The reliability and availability improvement of solar photovoltaic (PV) systems has become a critical area of interest for researchers. Reliability, availability, and maintainability (RAM) is an engineering tool used to addr...

https://link.springer.com/book/9789819746194#overview

https://link.springer.com/book/9789819788903

Distribution Automation Systems (DAS) are comprehensive control systems that automate the monitoring and management of power distribution networks. By integrating field devices, advanced communication technologies, and intelligent software platforms, DAS enables real-time decision-making, enhances grid reliability, and supports the efficient integr...

This study introduces an optimized hybrid deep learning approach that leverages meteorological data to improve short-term wind energy forecasting in desert regions. Over a year, various machine learning and deep learning models have been tested across different wind speed categories, with multiple performance metrics used for evaluation. Hyperparam...

Global warming is a vital problem that many researchers tried to solve with so many solutions such as: reducing electricity production with conventional generators by using renewable energy resources and using hydrogen as an alternative to fossil fuels. The universal Economic crisis came across to cut off certain quantities at scheduled times. This...

The transition to sustainable power infrastructure necessitates integrating various renewable energy sources efficiently. Our study introduces the deterministic balanced method (DBM) for optimizing hybrid energy systems, with a particular focus on using hydrogen for energy balance. The DBM translates the sizing optimization problem into a determini...

The growing load demand globally necessitates increasing the penetration of renewable energy sources into electrical grids as well as interconnecting grids from different countries and even continents through HVDC transmission systems. Since these applications rely on power electronics devices, several power quality issues arise, namely voltage...

High voltage direct current (HVDC) systems provide important advantages; among them the ability to transmit enormous amounts of electrical power over great distances at low cost. As a result, planners of power systems consider it as a viable choice for power transmission and interconnection of asynchronous networks. Depending on HVDC grids, contine...

The urgent need to reduce greenhouse gas emissions has prompted the exploration of cleaner energy options such as renewable energy resources (RES) and electric vehicles (EVs). With the increasing use of RES and EVs, there are new opportunities and challenges for the stakeholders involved, and traditional centralized power system management methods...

Incorporating diverse renewable energy sources is imperative for establishing a resilient and sustainable power infrastructure. This research explores the optimal techno-economical hybrid energy system configuration, emphasizing hydrogen energy for system balance. We introduce a novel DBM (Deterministic Balanced Method) to ascertain the annual ener...

As technology continues to advance, it increases the energy demand. As a result, alternative technologies based on renewable energy are conceivable. Another significant contributor to worldwide energy usage has been cooking. Consequently, switching to solar energy for cooking can solve the current energy issue. The box-style solar cooker is the mos...

As HVDC system is capable of transmitting bulk power over great distances at low cost, it is widely used for electrical power transmission and interconnection of asynchronous systems in super grids. The paper focuses on the response of a voltage sourced converter (VSC) based HVDC system connecting two asynchronous AC sources to variable power and v...

this paper presents an overview of power-to-hydrogen-to-power (P2H2P) systems as insignificant producers of greenhouse gases (GHG). In addition, the dynamic performance of SOFC is presented along with its simulated mathematical model, and control strategies. Two control strategies of grid-connected SOFC are considered. These are the constant power...

This paper presents a new scheme for power swing detection and stability assessment for multi-machine power systems that adopts Smart Grid perception. It is an asynchronous scheme that uses the rate of change of the generator angle for stability assessment instead of synchronously estimating its absolute value, therefore, no Phasor Measurement Unit...

The urgent need to reduce greenhouse gas emissions has prompted the exploration of cleaner energy options such as renewable energy resources (RES) and electric vehicles (EVs). With the increasing use of RES and EVs, there are new opportunities and challenges for the stakeholders involved, and traditional centralized power system management methods...

This paper presents a scheme for power swing detection and stability assessment for multi-machine power systems in addition to a brief survey on that topic. The scheme adopts smart grid perception. It is an asynchronous scheme that uses the rate of change of the angle of the generator bus voltage instead of synchronously estimating the absolute rot...

Integrating numerous renewable resources has been extensively researched and studied to create a dependable energy system. This study investigated the best techno-economical hybrid energy system configuration while using hydrogen energy to keep the system's energy balanced. Additionally, this study aims to determine the best hybrid system configura...

Improving wind turbine performance, operation, and efficiency requires evolving Operation and Maintenance (O&M) methods. Different models are required for O&M choices. These models offer a broad variety of scenarios and variables to reduce energy costs and enhance wind farm profitability. In this regard, this paper proposes a detailed approach for...

This work presents a power swing detection scheme for multi-machine power systems that uses Wide Area Network (WAN) communications. Unlike the known Wide Area Measurement Systems (WAMS) detection schemes, it is an asynchronous scheme that is not based on synchrophasor principle. Therefore, it does not need Phasor Measurement Unit (PMU) for synchron...

This paper illustrates the impact of wind turbine (WT) subassemblies’ availability on WTs’ performance. Complete and detailed reliability, availability, and maintainability (RAM) analysis of various subassemblies of WTs utilizing the Weibull probability density function (PDF) is also introduced. A modified dynamic important measures-based reliabili...

In this webinar, an overview of the main characteristics of energy sources and requirements of proper operation of power systems are presented. The core of the webinar is a detailed overview of the hydrogen-based variable renewable energy systems for the large-scale standalone operation. Details of the Power-to-Hydrogen-to-Power (P2H2P) and Power-t...

In this paper, an extensive reliability analysis of wind energy conversion systems (WECS) is presented. Elaborate the analysis is presented starting from the component level to the subsystem level, then the overall WECS. The fault tree method with a Weibull probability distribution function is introduced as a complete model for estimating the wind...

https://electrical-engineering-portal.com/load-shedding-online-applications-power-system-emergency-state

A Udemy Course. Please visit https://www.udemy.com/course/power-system-reliability-concepts/?referralCode=667967CD376931A4ED67 For more details

Purpose This study aims to estimate the electric power production of the 20 MWp solar photovoltaic (PV) plant installed in the Adrar region, South of Algeria using minimal knowledge about weather conditions. Design/methodology/approach In this study, simulation models based on linear and nonlinear approaches were used to estimate accurate energy p...

Global solar radiation data is essential in the design of solar energy conversion devices. The most widely used model in the estimation of the global solar radiation coming to the earth’s surface is the Angtröm-Prescott model. In this model, relative sunshine duration plays an important role. In the current study, it was attempted to review differe...

This paper demonstrates the impact of subsystem availability on a large scale grid-connected photovoltaic (PV) systems’ performance. Subsystem denotes to the installation of some subassemblies, which can be very small or gigantic in size, that serve this subsystem and the overall system. The analysis is largely based on a huge worldwide dataset of...

Global solar radiation data is essential in the design of solar energy conversion devices. The most widely used model in the estimation of the global solar radiation coming to the earth's surface is the Angtröm-Prescott model. In this model, relative sunshine duration plays an important role. In the current study, it was attempted to review differe...

Hybrid off-grid system based on hydrogen systems is investigated in this paper to schedule the operations of fuel cell and electrolyzer. The frequent switching operations of the studied components results in diverse impacts on the lifetime of components and thus affects the economic study of the project due to frequent maintenance and replacements....

A technical analysis based on modeling, simulation, optimization and verification was conducted for the design of an off-grid hybrid solar PV/hydrogen system. The main objective is to make sizing optimization of the off-grid system to meet the desired electric load of a residential community in a studied region. Additionally, the goal of this study...

https://www.udemy.com/course/fundamentals-of-photovoltaic-technologies-and-systems/?referralCode=995C114695B53B56A22D

https://www.udemy.com/course/uninterruptible-power-supply-ups-systems/?referralCode=2FE684A6431522945CC8

From reliability, maintainability, and availability (RAM) points of view, the performance of power transformers has significant impacts on the performance of the entire power network. Their performance has also significant impacts on the power interruptions at various voltage levels and the consequent customer interruption costs. This paper l discu...

This paper demonstrates the impact of subsystem availability on a large scale grid-connected photovoltaic (PV) systems' performance. Subsystem denotes to the installation of some subassemblies, which can be very small or gigantic in size, that serve this subsystem and the overall system. The analysis is largely based on a huge worldwide dataset of...

The objective of the present research is to analyze the role of the institutions in the biodiesel industry, in order to know if there is a Mohamed EL-Shimy (ed.). Sustainable Energy Technologies and Systems. LAP-Lambert Academic Publishing, ISBN 978-620-2-05640-3, Aug. 2019. 492 relationship with the quality and maturity of the same with the ventur...

This study aimed to analysis the high spatial resolution solar resource for the southwestern region of Algeria, this type of information can be the basis for an efficient planning and monitoring of solar energy application systems. The main objective is establishing high resolution global irradiation maps for Adrar region, provides average annual a...

The main objective of this research is to identify the main aspects presented in three companies of energy generation from biogas produced by landfills in three cities of Mexico: "BENLESA" in Salinas Victoria, Nuevo León; "YLEM ENERGY LIMITED" in Aguascalientes, Aguascalientes; And "Biogas Juárez" in Ciudad Juárez, Chihuahua. Analyzing these compan...

This chapter illustrates a preliminary-level approach for estimating the net energy yield of solar-PV generators. The presented approach is based on approximate modeling of the energy production using the Panel Generation Factor (PGF), and derating factors of solar-PV systems. In summary, this chapter answers the following questions: How much energ...

From reliability, maintainability, and availability (RAM) points of view, the performance of power transformers has a significant impacts on the performance of the entire power network. Their performance has also a significant impacts on the power interruptions at various voltage levels and the consequent customer interruption costs. This paper wil...

There is an urgent need for constructing adequately accurate standard reduced order models of various renewable sources for fast assessment of the stability and security of power grids. This chapter focuses on this theme considering solar photovoltaic generators (SPVGs) 248. The main objectives of the paper include the construction of a valid reduc...

Photovoltaic (PV) and wind energy conversion systems have significantly contributed to the growing electricity demand because the conditions for large-scale utilization of solar and wind energy are excellent. This chapter proposes an analytical approach to evaluate the availability of solar-PV and wind energy conversion systems. The reliability blo...

The optimal site matching of wind turbines became a systematic optimization problem, and properly designed wind turbines are based on this site-dependent optimization problem. The objectives of the optimal site matching of wind turbines are the maximization of the annual energy production and better utilization of the installed capacity on a monthl...

This chapter presents an overview of the mathematical simulation of the DFIG-based wind turbines in comparison with two alternative sources of energy production. The first source is the SCIG-based wind turbine, while the second one is the conventional synchronous generator (SG). In addition, the chapter describes the details of using a laboratory r...

This chapter presents a description of the generalized approach for sizing and sizing evaluation of single source Variable Renewable Energy (VRE) systems operated in either off-grid, or grid-connected modes for educational purposes. The approach can be applied considering various types of energy storage, such as electrochemical batteries, and hydro...

Avoiding power interruption is among the main requirements of sustainable energy sources. The chapter presents a brief summary of the security requirements, and operational states of power systems. In addition, a detailed comparison between the optimization formulations of the classical OED, OPF, and SSCOED is presented. Linear programming is used...

Recently, the installations of environment-dependent renewable energy systems are increased into the electrical grid in order to meet the national strategic plans of most countries. As a consequence, the electrical grid became highly decentralized and vulnerable due to the injection of intermittent power. This will increase the necessity to limit s...

From reliability, maintainability, and availability (RAM) points of view, the performance of power transformers has significant impacts on the performance of the entire power network. Their performance has also significant impacts on the power interruptions at various voltage levels and the consequent customer interruption costs. This paper will di...

PREFACE This book presents updated scientific issues, and future plans related to energy production technologies, and energy systems. The book focuses on the electrical energy. It includes selected topics that cover the following themes: 1. Energy technologies and production studies, 2. Energy security and optimization, 3. Stability of energy sys...

This study aimed to analysis the high spatial resolution solar resource for the south western region of Algeria, this type of information can be the basis for an efficient planning and monitoring of solar energy application systems. The main objective is establishing high resolution global irradiation maps for Adrar region, provides average annual a...

The main objective of this research is to identify the main aspects presented in three companies of energy generation from biogas produced by landfills in three cities of Mexico: "BENLESA" in Salinas Victoria, Nuevo León; "YLEM ENERGY LIMITED" in Aguascalientes, Aguascalientes; And "Biogas Juárez" in Ciudad Juárez, Chihuahua. Analyzing these compan...

The objective of the present research is to analyze the role of the institutions in the biodiesel industry, in order to know if there is a relationship with the quality and maturity of the same with the ventures. Starting with a literature review, the framework of the current situation is identified, covering aspects related to formal institutions,...

This book presents an integrated lumped course targeting the control systems for industrial applications with focus on electric power components. The main objective is to provide the readers the capability of dealing with the general control problem focusing on practical applications. Consequently, the basics of control systems and elements as well...

From reliability, maintainability, and availability (RAM) points of view, the performance of power transformers has a significant impacts on the performance of the entire power network. Their performance has also a significant impacts on the power interruptions at various voltage levels and the consequent customer interruption costs. This paper wil...

The main purpose of this chapter is to provide the information about the basic concept of the solar photovoltaic (PV) technology with the description of the main conceptual characteristic under different conditions. Some essential tests of the performance of solar-PV systems under on-shore, and off-shore conditions are performed. The results show t...

This chapter presents a description of the generalized approach for sizing and sizing evaluation of Variable Renewable Energy (VRE) systems operated in either off-grid, or grid-connected modes for educational purposes. Various constraints are considered. Two sets of constraints are included in the presented approach. The first set is the equality c...

From reliability, maintainability, and availability (RAM) points of view, the performance of power transformers has significant impacts on the performance of the entire power network. Their performance has also significant impacts on the power interruptions at various voltage levels and the consequent customer interruption costs. This chapter prese...

This chapter presents an overview of the mathematical simulation of the DFIG-based wind turbines in comparison with two alternative sources of energy production. The first source is the SCIG-based wind turbine, while the second one is the conventional synchronous generator (SG). In addition, the chapter describes the details of using a laboratory r...

The optimal site matching of wind turbines became a systematic optimization problem, and properly designed wind turbines are based on this site-dependent optimization problem. The objectives of the optimal site matching of wind turbines are the maximization of the annual energy production and better utilization of the installed capacity on a monthl...

Recently, the installations of environment-dependent renewable energy systems are increased into the electrical grid in order to meet the national strategic plans of most countries. As a consequence, the electrical grid became highly decentralized and vulnerable due to the injection of intermittent power. This will increase the necessity to limit s...

Photovoltaic (PV) and wind energy conversion systems have significantly contributed to the growing electricity demand because the conditions for large-scale utilization of solar and wind energy are excellent. This chapter proposes an analytical approach to evaluate the availability of solar-PV and wind energy conversion systems. The reliability bl...

This chapter illustrates a preliminary-level approach for estimating the net energy yield of solar-PV generators. The presented approach is based on approximate modeling of the energy production using the Panel Generation Factor (PGF), and derating factors of solar-PV systems. In summary, this chapter answers the following questions: How much energ...

Avoiding power interruptions is among the main requirements of sustainable energy sources. The chapter presents a brief summary of the security requirements, and operational states of power systems. In addition, a detailed comparison between the optimization formulations of the classical OED, OPF, and SSCOED is presented. Linear programming is used...

A technico-economic analysis based on modeling, simulation, optimization and verification using software tools in the design of an off-grid hybrid solar-PV and fuel cell based electric energy production system. The system consists mainly of solar-PV array, electrolyzer, hydrogen tank, and fuel cell. The main objective of the sizing optimization of...

This course presents electromagnetic transformers for use in power and sensing applications. It is prepared for high-level technical, engineering, and non-engineering students working in various industrial facilities and power grids. The book also highlights some special types of transformers. By the end of this course, the students should be able...

This book presents an integrated lumped course targeting the control systems for industrial applications with focus on electric power components. The main objective is to provide the readers the capability of dealing with the general control problem focusing on practical applications. Consequently, the basics of control systems and elements as well...

This course presents electromagnetic transformers for use in power and sensing applications. It is prepared for high-level technical, engineering, and non-engineering students working in various industrial facilities and power grids. The book also highlights some special types of transformers. By the end of this course, the students should be able...

يمكن تحديد مؤشرات عول التغذية الكهربية لشبكات التوزيع عن طريق دراسة وتحليل انقطاعات التيار مباشرة لدى المشتركين أو من البيانات الإحصائية عن الانقطاعات بالمواقع المختلفة بنظم التغذية الكهربية. تعطى الطريقة الأولى، في حالة القيد الصحيح للانقطاعات، أعلى النتائج دقة عن عدد مرات وطول فترة انقطاعات التغذية الكهربية إلى المشتركين. كذلك تمكن البيانات الإحص...

لابد أن تختار المتغيرات الأساسية للشبكات الكهربية وكذلك خواص المعدات المستخدمة بها على أساس دراسات الجدوى الفنية/الاقتصادية. ويلزم لدراسة الجدوى الفنية/الاقتصادية تقدير مستوى عول التغذية الكهربية ومن ثم حساب حجم الخسارة لدى المشتركين نتيجة لانقطاع التيار. كما أن بيانات خسارة المشتركين لازمة أيضا لتحديد جدوى الإجراءات المختلفة لرفع عول الشبكات الحال...

أصبح رفع عول التغذية الكهربية للمشتركين مطلب الجميع حيث يوصى بمباشرة الطرق المختلفة لرفع عول التغذية الكهربية بما فيها استخدام وحدات التوليد الاحتياطي لا مركزيا( لدى المشتركين ). أن أبسط أنواع إنتاج الطاقة اللامركزية يتحقق بتركيب وحدات توليد احتياطي غير مكلفة بمحركات ديزل وربما في حالات متفرقة بمحركات تعمل بالبنزين (بسعات من أقل 5 ك.وات إلى عدة ميج...

اوضحت دراسة الانقطاعات فى شبكات التوزيع ومنشآت الإنتاج أن فصل المغذيات لاجراء اعمال الصيانة الوقائية والاصلاح وغيرها ينتج عنة عدم استخدام الطاقة الكهربية التى قد تزيد، فى بعض الحالات، عن حجم الطاقة الغير مستخدمة فى حالة الانقطاعات الاضطرارية. خلاف الفصل الاضطرارى الذى يمكن حدوثة فى اوقات مختلفة على مدار اليوم فان الفصل للصيانة والاصلاح، كقاعدة، يتم...

The report estimates and optimizes the costs of power supply systems in the power distribution networks. The considered supply system consists of transformer points ( TP), medium tension (6-25 kV) networks and low tension (0.38-0.4 kV) feeders.

Recently, solar power generation is significantly contributed to growing renewable sources of electricity all over the world. Reliability/availability improvement of solar photovoltaic (PV) systems has become a critical area of interest for researchers. Reliability, availability, and maintainability (RAM) is an engineering tool for addressing opera...

For the considered project, this report provides detailed conceptual design and viability analysis. A set of alternative plans and options for hydropower generation plants are considered. These plans are based on the proposed canals, water demands, consequent irrigation systems, and hydrology characteristics of various options. In addition, the rep...

This paper presents a systematic approach to empirical model selection for the global solar radiation (GSR) estimation considering the Algerian town of Adrar. The approach is based on various meteorological variables. The accuracy of the selected model is validated using GSR measurements in the considered location (i.e. Adrar) through eight statist...

For the considered project, this report provides detailed conceptual design and cost estimation of proposed large-scale water pumping station alternatives. Based on the target water pumping load (i.e. discharge, and total head), a suitable water pump is selected. The proper selection of feasible water pumps for this project is considered as a chall...

The concept of hydrogen cities is an old dream of achieving super sustainable integrated energy systems. Practically, it starts with the Danish dream H2Pia which is a complete urban community based on variable renewable energy, and hydrogen technologies as the sources of energy for various types and classes of loads. These loads include electrical...

This course presents electromagnetic transformers for use in power and sensing applications. It is prepared for high-level technical, non-engineering students working in medical facilities, and industrial systems. The book also highlights some special types of transformers. By the end of this course, the students should be able to: (a) State the ba...

Accurate predictability of the solar resource can reduce the consequent impacts of the inherent variability, and intermittency of the resource. Enhancing the predictability of the solar resource provides an essential tool for the design, performance analysis, and economic evaluation of various solar energy projects. In addition, accurate predictabi...

In general, the optimal power transaction is expressed using a total operating cost for the joined generating units while the power delivery is dispatched using a power schedule commitment. These financial aspect and power participation are used to measure all technical processes during providing and selling energy to customers. Moreover, the power...

This book presents the fundamentals of electronic and electrical circuits. The document presented the main theories, as well as many experiments for verification of various theoretical and mathematical aspects. Therefore, this document can also be considered as a laboratory workbook. The presented experiments are carefully selected to well demonstr...

This book presents the first course in electrical engineering for high level technicians working in the fields of electrical systems in medical facilities, medical industries, and other critical facilities. The book focuses on the power supply systems at the medium voltage (MV), and low voltage (LV) levels. It presents the fundamentals and advanced...

This book presents an integrated lumped course targeting the electric circuits, and control systems. The main objective is to provide the students the capability of dealing with the general control problem with focus on practical electrical systems. Consequently, the modeling and analysis of basic DC and AC electric circuits are presented in this b...

This book provides the content sufficient for the first course in mechatronics. The main objective of the books is the habilitation of non-engineers for working in motion control, and mechatronics systems of industrial scale, and of high power applications. The first two chapters of the book present the core materials necessary for understanding th...

This paper presents an experimental determination of the main and advanced characteristics of photovoltaic (solar-PV) modules as affected by variations in the solar irradiance and temperature. In addition, the effects of connecting modules in series, and in parallel are inspected. The measured main characteristics are the current/voltage (IV), and...

Maximization of the incident energy at surfaces of the photovoltaic modules is among the key factors of energy extraction maximization. In this paper, fixed tilt solar-PV systems are considered. The incident solar energy maximization problem is formulated as the maximization of the solar energy incident on the flat surfaces of the traditional flat...

Maximization of the incident solar energy at the surfaces of the photovoltaic (solar-PV) modules is among the key factors of the energy extraction maximization problem. Although automatic sun tracking alternatives can enhance the energy extraction, their proper use is highly dependent on the considered geographical location. In addition, these trac...

The presentation provides an overview of various themes associated with the Electrical Power and Machines (EPM) discipline. The target audiences are the second year electrical engineering students. The objective is to help the target audiences understanding the main and advanced concerns of the EPM.