Ahmed G. Abo-Khalil

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• PhD
• Professor (Associate) at University of Sharjah

Advanced and hybrid energy storage technologies offer a revolutionary way to address the problems with contemporary energy applications. Flexible, scalable, and effective energy storage is provided via thermal-electric systems, battery-supercapacitor hybrids, and high-performance supercapacitors. These technologies provide a sustainable route to th...

Photovoltaic (PV) panels are vital for renewable energy generation, yet their efficiency is critically hindered by environmental challenges such as dust accumulation, especially in arid regions like the UAE. Dust buildup can reduce efficiency by up to 30% within a month, threatening the sustainability of solar power, which is projected to supply 10...

This chapter presents a sensorless control technique of wind speed for controlling wind-driven doubly fed induction generators (DFIGs) energy systems. A concept behind this technique is to use opposition-based learning (OBL) to optimize the parameters of support vector regression (SVR) system. The parameters of SVR are adjusted using a particle swa...

The growing global demand for electricity necessitates efficient renewable energy solutions, with photovoltaic (PV) systems emerging as a prominent candidate. This study presents a novel hybrid Maximum Power Point Tracking (MPPT) algorithm that integrates the Artificial Bee Colony (ABC) optimization method with the Incremental Conductance (IC) tech...

An accurate estimation of photovoltaic (PV) power production is crucial for organizing and regulating solar PV power plants. The suitable prediction is often affected by the variable nature of solar resources, system location and some internal/external disturbances, such as system effectiveness, climatic factors, etc. This paper develops a novel st...

The rising interest in hybrid alternating current (AC)/ direct current (DC) microgrids among the global research community can be attributed to the widespread adoption of distributed generation systems (DGs). Therefore, this study applies the modular multilevel converter (MMC) in interconnected microgrids to serve as an interlinking converter invol...

Nowadays, atmospheric water harvesting (AWH) attracts great attention due to its potential to address water scarcity, especially in arid regions. A key component of adsorption-based atmospheric water harvesting is the adsorbent materials, which are porous materials characterized by high surface area and the ability to adsorb water vapor from the at...

In Egypt, the production of power and the associated environmental problems are starting to take the stage. One environmentally responsible way to lessen the power crisis is to employ renewable energy sources effectively and efficiently. This paper proposes to develop a hydrogen energy storage-based green (or environmentally friendly) power plant o...

This paper undertakes a comprehensive investigation into incorporating sustainability within higher education, aligning with the United Nations' Sustainable Development Goals (SDGs). Utilizing quantitative and qualitative research methods, our study delves into the status quo, methodologies, and impacts of sustainability education across a spectrum...

Photovoltaic (PV) systems have been at the forefront of renewable energy resources, being a primary alternate source of energy within the electricity supply. However, PV systems are vulnerable to abrupt changes in weather conditions, which affects the stability of DC output generation. Therefore, forecasting the DC power with respect to variable we...

The increasing peak electricity demand and the growth of renewable energy sources with high variability underscore the need for effective electrical energy storage (EES). While conventional systems like hydropower storage remain crucial, innovative technologies such as lithium batteries are gaining traction due to falling costs. This paper examines...

Wind turbines have the fundamental characteristic of directly converting wind energy into electricity; however, the conversion efficiency largely depends on atmospheric conditions such as wind speed. Therefore, it is essential to consider the wind power operation to control at the maximum power point to extract the optimum power. Several techniques...

Against a backdrop of massive population growth, the supply of essential urban services, such as water and power, in developing countries is not growing at nearly the same pace. The critical aspects of this urban development are poorly understood. The main objective of this study was to identify and analyze the different forms of governance in the...

Recently, the Modular Multilevel Converter (MMC) has drawn significant attention due to its diverse merits and its applicability to a wide range of medium to high-power applications. The growing interest in the MMC can be attributed to its attractive features such as modularity, reliability, and high voltage capability. Significant research has bee...

Wind energy is one of the fastest growing energies due to its feasible cost and environment friendly nature, where there is no emission of waste or greenhouse gases emission. Wind energy systems should be connected to the electric utility to avoid the effects of the intermittent nature of these sources. One of the main problems of the utility integ...

Islanding is a critical issue in the safe and reliable operation of photovoltaic (PV) systems. Different methods have been developed for detecting and disconnecting the system from the grid to prevent islanding. This paper comprehensively compares and discusses the different islanding detection methods for PV systems. The methods include frequency...

UAE has good weather conditions for the integration of renewable energies in utility grid, especially photovoltaic solar energy, as it is one of the countries with the highest rate of solar radiation in the world, thus being able to contribute to policies to reduce greenhouse gas emissions. This article presents a study on how to control the variab...

Today, with the progress of technology, the world is facing an increasing growth in power consumption. Since the fuel of most power plants is supplied from fossil fuels, it has caused an increase in global fossil fuel consumption and environmental degradation. ّFurthermore, the volatility of fossil fuel prices and unstable energy security have prom...

Today, with the progress of technology, the world is facing an increasing growth in power consumption. Since the fuel of most power plants is supplied from fossil fuels, it has caused an increase in global fossil fuel consumption and environmental degradation. ّFurthermore, the volatility of fossil fuel prices and unstable energy security have prom...

The electricity sector has been undergoing profound transformations. In particular, the Portuguese self-consumer regime has allowed customers of the medium and low voltage electricity grid to be producers/consumers of electricity, actively contributing to greater energy efficiency. In this context, the energy that comes from the sun is not used to...

In this paper, a novel approach for extracting the maximum power from a wind energy conversion system (WECS) eqquiped with a permanent magnet synchronous generator (PMSG) is presented. Wind power generation systems have gained prominence as an alternative to conventional power plants worldwide, being the renewable energy source with the best growth...

This work discusses the novel application of proton exchange membrane fuel cells (PEMFC) in the transport sector as well as portable applications. This kind of fuel cell produces a considerable quantity of heat while in operation. This quantity of heat is about 45–60% of entire energy composition of the hydrogen that is introduced into the cell. A...

Internal combustion engines is gradually decreased with the recent evolution of electric vehicles (EVs) in the automotive industry. Electric motors are replacing the energy systems mainly to improve the powertrain's efficiency and ensure they are environmentally friendly. These novel powertrains are designed to operate solely on batteries or superc...

Forward converters have been broadly used in the power supply industry due to their simplicity, worthy efficiency, and low cost. A novel prototype soft-switched zero-voltage and zero-current ZVZC PWM DC-DC power converter with low voltage/current stresses is introduced for telecommunication power feeding in this paper. A new two-switch interleaved...

A thermal management system (TMS) is necessary for lithium-ion batteries (LiBs) used in electric vehicles/hybrid electric vehicles (EVs/HEVs), which generate excessive heat during fast discharging and charging. In order to provide low power consumption and efficient heat transfer, finding the most efficient, cheapest, and lightest solution like pha...

Using renewable energy sources instead of fossil fuels is one of the best solutions to overcome greenhouse gas (GHG) emissions. However, in designing clean power generation microgrids, the economic aspects of using renewable energy technologies should be considered. Furthermore, due to the unpredictable nature of renewable energy sources, the relia...

A smooth coupling is implemented between the grid and doubly fed induction generator-based wind turbines (DFIG-WTs) during grid voltage imbalance. The nonlinear characteristics of a grid-connected DFIG-WT system may increase stresses on the mechanical and electrical components of wind turbines. Such difficulties are greatly increased during periods...

This study deals with the performance improvement of the output active power of a grid-connected double fed induction generator-based wind turbine (DFIG-WT). This can be achieved by reducing both the overall system losses and the system disturbances. Therefore, a novel control strategy based on a nonlinear auto disturbance rejection controller (NAD...

The continuous rapid growth of the world population over the coming decade remains a crucial issue that requires ambitious innovations such as electric vehicles (EVs) to decarbonize the transportation sector. Temperature sensitivity is a critical issue in lithium-ion batteries (LIBs) for EVs. The control of the working temperature lithium-ion batte...

Phase change materials (PCMs) are one of the promising materials in thermal energy storage (TES) systems, while commonly utilized PCMs have weak thermal conductivity. Therefore, elevating high relatively thermally conductivity for the PCM composites using various nanoparticles with different named the nano-enhanced phase change material (NePCM) is...

Sustainable energy storage medium has increased significantly in recent times. Air contamination, which is widely considered to be harmful to an ecological niche, has fuelled the growth of sustainable energy sources. On the other hand, adopting sustainable energy technology can create significant issues for keeping the grid stable. With variations...

The requirement for passive cooling strategies in buildings has great attention in almost all countries, where hot temperatures are predominant throughout the year. The ventilation process is a crucial necessity for a healthy lifestyle and its significance is additionally highlighted through the contemporary universal outbreak of Covid-19. One of t...

This work presents the design and implementation of a wind turbine simulator to carry out laboratory tests on the generation,regulation, and control of a wind power conversion system (WECS) with a capacity of 2 MW. A three-phase squirrel-cageinduction motor emulates the static and dynamic wind turbine characteristics based on the torque-speed profi...

The operation of the wind energy conversion (WEC) system is affected by the weather conditions as its generated power is dependent on the wind speed. It is essential to monitor the maximum generated power from the WEC system, this requires installing a maximum power point tracker (MPPT). This paper proposes a recent metaheuristic optimization appro...

This paper comprehensively reviews the current status of multidisciplinary technologies in electric vehicles. Because the electric vehicle market will expand dramatically in the coming few years, research accomplishments in power electronics technology for electric vehicles will be highly attractive. Challenges in power electronics technology for d...

Heat pipes are becoming gradually more popular as a passive heat transfer technology due to their effective performance. The heat pipe heat exchanger (HPHE) is an effective tool in recovering waste heat. The present paper provides a comprehensive review of the state-of-the-art background of heat pipe for various waste heat recovery systems (WHRSs)....

The proliferation of eco-friendly electric vehicles is becoming an irresistible trend. As governments worldwide tighten regulations on fuel efficiency and exhaust gas, the position of electric vehicles is expected to become more and more solid. The essence of this study is to cover the main components of the EV and the needed infrastructure and inv...

Solar energy is pollution-free and causes no greenhouse gas emissions after installation and during power generation. Regarding the environmental concerns raised by power generation systems, in the present study a novel solar-based CCHP system is proposed. The system is a modified configuration of conventional Rankine cycle and ejector refrigeratio...

The integrated biomass gasification-Solid Oxide Fuel Cell (SOFC) technology combines the benefits of renewable and hydrogen energy-based systems. In this work, this system is incorporated with solar-powered hydrogen production and injection into the SOFC to provide higher hydrogen concentration in fuel mixture of the SOFC. Proton Exchange Membrane...

In the current work, thermodynamic examination for cogeneration of electricity and cooling based on a polymer exchange membrane (PEM) fuel cell was carried out. To the waste energy in the fuel cell, an absorption refrigeration unit is employed in two modes with ejector and without ejector. This system includes a PEM-FC, an absorption refrigeration...

Solar energy is pollution-free and causes no greenhouse gas emissions after installation and during power generation. Regarding the environmental concerns raised by power generation systems, in the present study a novel solar-based CCHP system is proposed. The system is a modified configuration of conventional Rankine cycle and ejector refrigeratio...

As interest in emergency power has increased, research on engine generators has been actively conducted. Permanent magnet synchronous generators (PMSGs) are suitable for small-capacity engine generators because they have higher efficiency and faster response than other motors. In this paper, the static and dynamic characteristics of the tidal turbi...

To carry out the study and simulations of anti-islanding systems, it is necessary to take into account the generic system proposed by the IEEE 929-2000 and IEEE 1547 standards, where the network, the RLC load, and PV inverter are connected in parallel to the PCC. The IEEE 929-2000 standard defines the quality factor to have a standard test conditio...

In this paper, a new multi-port DC-DC power converter used to deal with the intermittent nature and slow response in renewable energy applications is proposed. The proposed converter integrates a DC-DC converter and a DC-AC inverter, and the proposed circuit integrates various renewable energy sources in addition to the energy storage unit. By comb...

In this paper, a sensorless permanent magnet synchronous motor (PMSM) drive was presented based on calculating the back EMF using the reference stator voltages, which are the output of the d-axis current controller, which includes information about the rotor position. Sensorless control estimates the position information necessary for vector contro...

In this chapter the performance of various maximum power point tracking techniques for Photovoltaic (PV) systems has been presented, under uniform and non-uniform irradiance conditions. Under uniform irradiance conditions, the power-voltage curve of PV systems is nonlinear and contains one peak point whose location appertains to the irradiation and...

Recently, several types of research have been conducted on solar stills due to the low cost of water productivity, the feasibility of their use in most climates, and their environmentally friendly properties. The performance of solar desalination systems depends on various geometric designs and methods. This includes thermoelectric heating and cool...

This paper presents a mathematical modeling and current control of DFIG wind turbine system in the presence of unbalanced and harmonic distortions in the grid voltage. A proportional resonant (PR) current controller is modeled and implemented to reduce the impacts caused by the presence of double‐frequency, fifth and seventh harmonic components in...

The overall efficiency of the DFIG is superior when it is working close to the rated operating point and rated flux level. However, in light loads, optimal efficiency requires operation at a reduced flux level. In this chapter, several algorithms for increasing the steady-state efficiency that integrated with the wind power generation system are pr...

The conventional control of the voltage source converter (VSC) assumes that the input voltage is balanced. However, unbalanced voltage is a phenomenon that occurs frequently in actual industrial sites. If the grid voltage is unbalanced, THD increases due to voltage negative component, and low harmonic components appear in DC-link voltage, which adv...

In order to achieve maximum power point tracking (MPPT) of wind energy systems, the rotating speed of wind turbines (WTs) ought to be adjusted in the constant as indicated by wind speeds. However, fast wind speed varieties and heavy inertia bargain the MPPT control of WTs. This chapter proposes a fuzzy logic controller (FLC)-based MPPT strategy for...

This chapter introduces a robust control scheme of load frequency control (LFC) of a micro-grid system integrated with a wind energy system. The control scheme is based on H ∞ and linear quadratic Gaussian techniques. The main idea of the control design is to be stable against the parameter's uncertainties and the load disturbance. A complete model...

Wind generation is considered as one of the optimum renewable energy sources due to its more saving running cost, zero-emission, and friendly environment at comparing with the traditional power plants. Using the wind farms with the utility grid can't reach the optimum compensation during any abnormal condition in the power system. Distributed Stati...

The objective of this chapter is to introduce the state of the art technology in wind power plant control and automation. This chapter starts with a historical background about supervisory control and automation evolution in the last decades. Several remarks are made regarding the use of SCADA Systems in wind turbine power plants. The Supervisory C...

This work presents an alternative to the conventional photovoltaic maximum power point tracking (MPPT) methods, by using an opposition-based learning firefly algorithm (OFA) that improves the performance of the Photovoltaic (PV) system both in the uniform irradiance changes and in partial shading conditions. The firefly algorithm is based on firefl...

In this paper, an improved Maximum Power Point Tracking (MPPT) algorithm for a tidal power generation system using a Support Vector Regression (SVR) is proposed. To perform this MPPT, a tidal current speed sensor is needed to track the maximum power. The use of these sensors has a lack of reliability, requires maintenance, and has a disadvantage in...

This paper presents a model reference adaptive system (MRAS) method to estimate the position and speed of permanent magnet synchronous motor (PMSM) by considering the error between real and estimated rotor position values. A state equation of PMSM in synchronous d-q reference frame is expressed based on the estimated speed and nominal parameter of...

This article focuses on the energy-saving of each driving distance for battery electric vehicle (BEV) applications, by developing a more effective energy management strategy (EMS), under different driving cycles. Fuzzy logic control (FLC) is suggested to control the power management unit (PMU) for the battery management system (BMS) for BEV applica...

The disadvantage of photovoltaic (PV) power generation is that output power decreases due to the presence of clouds or shade. Moreover, it can only be used when the sun is shining. Consequently, there is a need for further active research into the maximum power point tracking (MPPT) technique, which can maximize the power of solar cells. When the s...

The photovoltaic (PV) system is always operated at the maximum power point (MPP) condition irrespective of the fluctuations in PV voltage. The maximum power point tracking (MPPT) employed in PV system is not effective during the presence of current ripple as normal tracking becomes increasingly complex during fluctuation in solar irradiation or due...

This paper presents a soft-switching circuit of a three-phase inverter for servomotor driver. The soft switching is achieved using an auxiliary quasi-resonant circuit on the DC link. The principal of operation and design steps are described in details. Soft-switching operation condition is validated in this circuit by means of simulations and exper...

Currently, among the topologies of wind energy conversion systems, those based on full power converters are growing. The permanent magnet synchronous generator (PMSG) uses full power converter to allow wide speed ranges to extract the maximum power from the wind. In order to obtain efficient vector control in a synchronous generator with permanent...

This study proposes a novel signal detection and modulation optimization scheme using the unscented Kalman filter (UKF) for the Bluetooth voice communication system for the indoor noise environment at Oakland University. It is designed for filtering received signals at the front-end of the receiver stage and established to be robust due to the usag...

Photovoltaic (PV) energy systems are very important electric generation sources in modern power systems. The generated power from the PV array is a function in its terminal voltage. Tracking the maximum power needs a DC/DC converter to control the PV array terminal voltage. The boost converter is used in this paper for this purpose. Due to the mult...

Since the lifespan of an electrolytic capacitor is relatively short compared to other power semiconductor devices, the failure rate accounts for 60% and, thus, it is the most vulnerable component of the power conversion device. Therefore, the accurate measurement of the lifetime of an electrolytic capacitor is very important in ensuring the reliabi...

Bat Algorithm (BA) is used to track the global peak (GP) of photovoltaic (PV) energy systems due to its fast convergence. Meanwhile, BA has many limitations when it is used as maximum power point tracker (MPPT) of PV systems like the need for re-initialization, and the problem of premature convergence. These problems are solved in this paper by inj...

In this paper, a wind speed sensorless control method for doubly-fed induction generator (DFIG) control in wind energy systems is proposed. This method is based on using opposition-based learning (OBL) in optimizing the parameters of the support vector regression (SVR) algorithm. These parameters are tuned by applying particle swarm optimization (P...

Generally, the mathematical formulation of the dynamics governing multi‐area power systems with Unified Power Flow Controller (UPFC) is a challenging task owing to the presence of both differential and algebraic sub‐systems. The proposed research work attempts to integrate the two subsystems by replacing the algebraic subsystem with a differential...

Induction heating (IH) is an environmentally friendly solution for heating and melting processes. The required high-frequency magnetic field is accomplished through frequency controllers. Direct frequency controllers (DFC) are preferred to dual converters as they have low conversion losses, compact size, and simple circuit arrangement due to low co...

Adaptive particle swarm optimization Global peak Maximum power point tracker Partial shading conditions A B S T R A C T The P-V characteristics of PV array has one peak under uniformly distributed irradiances. Whereas, there are many peaks in the P-V curve when the irradiance is not uniformly distributed over the PV array which is called "partial s...

This paper presents an improved control strategy for a doubly fed induction generator (DFIG) during unbalanced grid voltage conditions. The proposed strategy was applied in both synchronization and grid connected conditions. The synchronization process is carried by controlling the extracted positive and negative sequence components of the stator q...

The paper presents a modified Active Frequency Drift (AFD) algorithm to detect the islanding of grid-connected photovoltaic (PV) systems with low harmonics level without degrading its power-factor. Severe issues such as deterioration in power quality and electric shock can occur when a PV inverter operates in islanding mode. Various islanding detec...

Wind energy became one of the fast growing technologies in the field of electric energy generation. Generating electric power from wind energy system became mature technology and its cost combats the cost of generating electric energy from conventional energy sources. The cost of generated power from wind energy systems can be reduced by improving...

Partial shading of PV systems generates many peaks in the P–V curve. These peaks have one global peak (GP), the remaining being local peaks (LPs). Metaheuristic techniques such as PSO have proven superiority in capturing the GP and avoiding entrapment in an LP in comparison to conventional techniques. In case of partial shading conditions (PSC), th...

Installation of solar PV arrays at utility scale is gaining popularity nowadays because of the significant reduction in the cost of components as well as the global push towards clean energy. Solar PV plants along with Parabolic Trough Collector Solar thermal plants has the highest potential among the available Renewable Energy (RE) technologies ex...

Power versus voltage curves of partial shading photovoltaic (PV) systems contain several local peaks (LPs) and one global peak (GP). Most conventional maximum power point tracker (MPPT) techniques may not follow the GP under partial shading conditions (PSC). The use of metaheuristic techniques such as the bat algorithm (BA) and particle swarm optim...

Power versus voltage curves of partial shading photovoltaic (PV) systems contain several local peaks (LPs) and one global peak (GP). Most conventional maximum power point tracker (MPPT) techniques may not follow the GP under partial shading conditions (PSC). The use of metaheuristic techniques such as the bat algorithm (BA) and particle swarm optim...