Ahmed Al-Durra

Khalifa University | KU · Department of Electrical and Computer Engineering

This paper presents a proactive operation scheme for improving distribution system resiliency against natural hazards, specifically windstorms. In this context, important attributes associated with the windstorm consisting the distance from the windstorm route, the wind speed, the distance from tall trees and buildings, and cable type are used in a...

This paper presents a novel control scheme for combined frequency and voltage stabilization of an islanded multi-generator hybrid microgrid (IHμG). The control concept incorporates an improved virtual inertia support scheme (IVIS) and the recently developed yellow saddle goatfish technique (YSGA) to obtain optimal control parameters. IHμG model con...

The inverter-based distributed generator (IBDG) does not inherently provide inertia and damping capability since the inverter is a static part. Lack of system inertia and damping properties leads to frequency instability issues. To overcome these issues, virtual inertia and damping are control concepts that effectively improve system inertia and da...

Voltage variations such as sags and swells associated with voltage phase jump must be compensated using high active power requirements. The high active power requirements increase the cost and the size of an energy storage system (ESS) associated with the DVR. Some existing control schemes rely on decreasing the cost of phase jump mitigation by red...

This study proposes an incorporated strategy based on energy storage technologies like aggregated electric vehicles (AEVs) with frequency regulation (FR) to enhance the frequency stabilization during high renewable sources (RSs) penetration. Furthermore, an innovative cascaded controller is used in the FR loop, and the considered AEVs in isolated m...

One of the main drawbacks of the Inverter Interfaced Distributed Generator (IIDG) is that the protection of the inverter switch limits the fault current through the inverter control system to be almost equal to the rated current. As a result, traditional overcurrent relays cannot operate to protect the distribution lines in islanded microgrid conne...

The different fault characteristics of the inverter-based distributed generation (IBDG) units make the protection of the inverter-based islanded microgrids (IBIMGs) a formidable task. According to IEEE Std 1547.4, the limited fault current levels associated with the IBIMGs may result in misleading decisions of the traditional protective relays duri...

In this paper, an improved fixed-frequency-based integral sliding mode controller is designed and applied to a stand-alone photovoltaic (PV) system to obtain the desired reference signal for the maximum power point tracking. The proposed technique is designed with the modified sliding surface and sigmoidal function-based control law which improves...

This research paper proposes the new multi-criteria search based enhanced firefly algorithm for solving selective harmonic elimination in a multilevel inverter. This new enhanced firefly utilizes adaptive nature of social and cognitive components to find the global optima. To see the effectiveness of the proposed algorithm and for the evaluation of...

Power electronics-based converters are the major and most vulnerable components in wind power generation systems. Converter faults will affect power quality,damage expensive equipment such asgenerators, or even pose a massive threat to the entire power grid. Fault diagnosis is considered as a powerful means to improve system reliability and reduce...

In this article, a distributed control scheme to compensate for voltage harmonics in islanded microgrids is presented, where each distributed generation (DG) source has a primary control level and a secondary control level. In addition to the voltage and current control loops, the primary control level of DGs includes virtual impedance control loop...

The mismatch power loss due to non-uniform distribution of temperature gradient across the modules is a major challenge faced by Thermoelectric Modules (TEMs) in practical applications where there is a drop in temperature of exhaust gas from inlet to outlet. This work presents a new method for arranging TEMs in thermoelectric generator (TEG) arrays...

The rapid expansion of installed wind energy capacity and the continuous development of wind turbine technology has drawn attention to operation and maintenance issues. In order to keep wind power a competitive energy source, the development of high-reliability and low-maintenance wind turbine systems is imminent, the rise of fault diagnosis provid...

Solar Photovoltaic (PV) modules provide a reliable and clean electricity source that can suit various applications. Based on the quality and type of crystals, the PV modules are classified as monocrystalline, polycrystalline, and thin film. The improvements on different solar PV modules can be made efficiently with accurate mathematical models, whi...

This paper presents an improved feedback controller and optimal management system to operate a battery storage system in a microgrid. The aim is to optimize the storage usage by reducing the battery degradation. The feedback controller regulates the battery current to track a reference despite uncertainties. It includes a disturbance observer to co...

Increased attention is given to microgrids for their numerous advantages over conventional power networks. However, there are still a limited number of real microgrid networks that are currently in service, and this raises shortages in expertise on microgrids testing and evaluation before actual deployment. Low-cost, rapid, realistic, and flexible...

Inclusion of intermittent natured renewable energy resources in microgrid to reduce global warming, especially in shipboard power system and due to highly fluctuating propulsion load, frequency control strategy of isolated shipboard hybrid microgrid (ISHMG) is major point of attraction. Hence, a power system of marine vessel with dish-stirling sola...

Parameter estimation for solar photovoltaic (PV) models is a challenging issue due to the complex nonlinear multivariable of the current‐voltage and power‐voltage characteristics. In this article, an improved heap‐based algorithm (IHBA) is proposed to improve the performance of a recently published algorithm called heap‐based algorithm (HBA). The H...

A nine-level inverter with quadratic boost ability is proposed in this paper. The presented topology produces quadruple boosted output voltage by utilizing 10 switches, one diode, two capacitors, and a single dc source. In the proposed topology a back-end H-bridge is not required to produce negative voltage levels, which in turn reduces the voltage...

Line impedance varies between distributed generation and load feeders due to the existence of different distances and the micro-grids complexity. Therefore, conventional droop control methods do not have the desired efficiency in the power distribution between DG units. Generally, due to simplification, the impedance of the lines is considered non-...

Frequency control is considered as one of the vital factor in electrical networks. The idea of micro-grids based on renewable resources and energy storage units is one of the attractive solutions to the current network challenges. In this research, a novel method based on the uncertainties of power generation and using the energy storage characteri...

The main objective of this work is to develop an efficient reactive power compensated control technique for a fast-charging scheme for electric vehicle(s) (i.e., level-3 charging). The developed charging technique has the four-quadrant power flow operation with the simultaneous assurance of the compensated reactive power control. The developed char...

In hybrid power system (HPS), there are many inverter‐based generators (IBGs) that inject renewable energy into the system as electrical power. Transient stability analysis of HPS in which synchronous generators (SGs) are operated in parallel with IBGs is necessary to operate the network safely under large disturbances. This paper examines the tran...

In recent times, multilevel inverters (MLIs) have become very popular for commercial and industrial applications. Here, an eleven-level inverter and its power flow control are presented. The presented topology has a lesser component count than other existing topologies, thus reducing the devices and overall cost of the inverter. This inverter compr...

Abstract In this paper, a novel control strategy for grid‐integrated solar energy transfer system (SETS) is proposed which enhances the grid power quality along with active power injection. Some of the conventional grid synchronization controls face problems due to imperfect estimation of fundamental active load current during both grid‐side and lo...

This paper proposes a fault location (FL) scheme for a two-terminal double-circuit transmission line using one-terminal current and voltage measurements. As the proposed scheme is formulated in the phase-coordinates, the parallel transmission lines are not required to be decoupled, and the proposed scheme can be applied for transposed or untranspos...

This paper presents a day-ahead demand-side management (DSM)-integrated hybrid power management algorithm (PMA) with an objective of combined economic and emission load dispatch (CEED) considering losses. The algorithm was tested on an IEEE 30-bus six-generator system consisting of solar thermal/wind/wave/battery energy storage systems (BESSs) cons...

This paper proposes an improved energy management system to reduce the energy cost and the storage utilization of a hybrid solar and wind energy microgrid with battery storage and grid-connected option. The performance improvement relies on a parameter, called the contribution factor, that provides an adequate amount of the required power from the...

Cost-based droop schemes for microgrids have been developed to achieve cost reduction; meanwhile, the stability of microgrids (MG) is highly dependent on the droop control design and its parameters. This paper proposes a hybrid cost-based droop control that achieves both optimal economical operation and stability preserving for autonomous microgrid...

The technological development of wind energy conversion systems (WECS) is emphasized on the injection of wind power into the utility grid more smoothly and robustly. Sliding mode control (SMC) has proven to be a popular solution for the grid-connected WECS due to its robust nature. The super twisting sliding mode control (STSMC), a variant of SMC,...

Changing power system configuration may result in load shed recovery (LSR) because topology change can provide power flow control in meshed network. Some topologies may favor generation redispatch as compared to others and can eliminate line congestion which leads to LSR. One of the known methods for topology change is called transmission switching...

This article proposes a multilevel inverter (MLI) based grid-connected solar power transfer unit (PTU). This work is a technological enhancement for the interconnection of photovoltaic (PV) array and distribution grid for mitigating the present energy crisis and power quality issues. The proposed MLI generates nine-level output voltage with a minim...

Similar to emerging regional grid codes, the recently approved IEEE 2800 Standard mandates that inverter-based resources (IBRs) generate negative-sequence current during low-voltage ride-through (LVRT) conditions. The 2800 Standard requires that the IBRs' negative-sequence current lead the negative-sequence voltage by 90 $^\circ$ –100 $^\circ$ to...

Globally, wind power plants (WPPs) installations are dramatically increasing, leading to a large-scale integration into the power grids. Huge endeavors are devoted to achieving an efficient operation of WPPs. This paper offers a novel chaotic-billiards optimizer (C-BO) algorithm to properly design the fuzzy logic control (FLC) strategy for stabilit...

While high volume of power electronic converters with renewable energy are being integrated into the grid, low system strength of grid causes reduction in system inertia and loss of synchronization with power converters. This paper proposes a novel interactive control scheme of voltage source converter (VSC) connected to weak grid. Firstly, a grid...

The wide integration of all battery electric buses (BEB) in the operation of public transit services is identified as one of the most promising means toward decarbonizing public transport systems. In response, public bus transit (PBT) and utility grid operators are currently in need of developing analytical techniques that enable them to conduct tr...

This paper proposes an application of the recent metaheuristic rider optimization algorithm (ROA) for determining the optimal size and location of renewable energy sources (RES) including wind turbine (WT), photovoltaic (PV), and biomass-based Distributed Generation (DG) units in distribution systems (DS). The main objective function is to minimize...

The frequent and sudden increase of load in electric vehicles depletes oxygen from the fuel cell cathode, leading possibly to oxygen starvation. This paper presents the design of a controller for the air supply in fuel cell systems (FCS) that aims to replenish the depleted oxygen. A dynamic inversion is used as the feed-forward compensation for the...

In this paper, the Improved Chaotic Electromagnetic Field optimization (ICEFO) algorithm is adopted to generate the optimal values of unknown parameters of fuel cells (FCs). The mathematical model of polymer electrolyte membrane FC (PEMFC) is considered nonlinear and complex optimization problem with different control variables. The sum of squared...

This paper presents a sparse quaternion-valued minimization (SQVM) based control technique of two-stage grid supportive Photovoltaic (PV) power system with power conditioning capabilities. The grid side converter (GSC) is controlled by utilizing a SQVM control technique. The proposed algorithm enables the GSC to mitigate the load harmonics current...

This paper presents a robust adaptive optimal tracking control (RAOTC) scheme for permanent-magnet synchronous motor (PMSM) servo drive with uncertain dynamics via adaptive dynamic programming (ADP) method. First, an adaptive identifier is developed to estimate the nonlinear dynamic functions of the PMSM using a functional-link neural-network. Then...

Droop control is the most common approach for controlling inverter-based micro-grids. The active power droop gain has always been considered as the main parameter for identifying the micro-grid stability margin. Increasing this margin improves the transient performance and provides robustness to the micro-grid for a wide range of operations. Previo...

This paper presents an autonomous 3-phase 4-wire solar PV (Photovoltaic)-battery energy storage (BES) based microgrid controlled through p-norm proportionate-normalized least mean square (LP-PNLMS) current control and mode transition approach. The reliability of the supply across household nonlinear load is enhanced through smooth transfer from gri...

In this paper, an analytical method is presented to achieve maximum power point tracking (MPPT) for a solar photovoltaic (PV) array-based water pumping system comprising of an induction motor drive (IMD). The gating signals are generated using the space vector pulse-width modulation (SVPWM) method for three-phase inverter. This analytical MPPT cont...

Microgrids take a large part in power networks thanks to their operational and economic benefits. This research introduces a novel implementation of an adaptive proportional plus integral (PI) controller to boost the autonomous microgrid operation efficiency. The least mean and square roots of the exponential algorithm are utilized in the adaptive...

This paper presents the development and testing of a model-predictive control (MPC) for three phase ( $3\phi$ ) transformerless grid-connected 5-level power electronic converters (PECs). The proposed MPC employs a discrete-time model of 5-level PECs to predict the future values of the grid-injected currents and ground potential. Predicted values o...

Abstract This study presents a norm combination constrained set‐membership function (CCSMF)‐based approach for two‐stage photovoltaic (PV) array to be used in the three‐phase three‐wire system. Here, the norm is introduced in the control technique to improve the response of existing approaches. The norm is the addition of the magnitudes of the load...

This paper presents a novel robust current droop controller (RCDC) using a single droop loop. This scheme is unified supporting dual mode of operation for micro-grids (MGs), including grid connected mode (GCM) and islanded mode (ISM) while ensuring seamless transition between the two modes with proportional power sharing maintained. The proposed co...

Tremendous penetration of photovoltaic (PV) systems into the electric grids develops many challenges in the modern power systems. In the simulation analyses of PV systems, accurate modelling of PV modules plays a crucial role in enhancing the characteristics of such systems. Modelling of such PVs is represented by a non-linear I-V behavior, involvi...

Abstract The increasing number of Plug‐in Electric Vehicles (PEV) connected to the grid will create challenges to be addressed and opportunities that can be ceased. One challenge is the load shape dynamics, which might result in increasing the loading level on the distribution lines. On the other hand, there is an opportunity to use the PEV stored...

This paper presents a novel endeavor to use the Heap optimization algorithm (HOA) to solve the problem of optimal power flow (OPF) in the electricity networks. The key objective is to optimize the cost of fuel of the conventional generators under the system limitations. Various scenarios are studied in a later stage considering the addition of the...

Nowadays, multilevel inverters (MLIs) are gaining huge popularity for high power transformerless PV applications. Among the traditional MLIs, the cascaded H-bridge (CHB) MLI accommodates lower voltage rated input DC sources, which reduce the voltage stress across the devices. However, the CHB MLI requires multiple PV sources as separate DC link vol...

The DC microgrid (DC MG) concept enables the hosting of DC-type renewable energy resources. However, their intermittent nature means that a high penetration of renewables can jeopardize supply adequacy and voltage provision during islanding. The work presented in this paper was therefore directed at developing a probabilistic graphical approach bas...

This paper proposes a novel stochastic solution method for the static nonconvex power economic dispatch problem. All practical features such as valve point effects, ramp rate limits, prohibited operating zones, multiple fuel options, spinning reserve constraints, and transmission losses are considered. To develop the proposed algorithm, two modific...

An effective control system for the air supply in fuel cell systems (FCS) is required to prevent oxygen starvation and to maximize the net power. For this purpose, conventional feedback and adaptive controllers are designed using genetic programming (GP). To minimize the time required for the GP convergence, FCS models of different complexity are s...

This paper proposes two control strategies for the islanding operation of hybrid microgrid with a high penetration of wind driven cage induction generators. The control strategies combine approaches traditionally applied to self–excited cage induction generators with recent approaches for microgrid’s islanding operation. The proposed control strate...

This paper introduces a new time-domain fault location algorithm for two-terminal parallel transmission lines connected to large scale wind farms. The proposed algorithm employs only a half-cycle data window of synchronized current samples at both line terminals to avoid inaccurate estimation of current phasors due to the generated sub- and inter-h...

A routine task faced by Microgrid (MG) operators is to optimally allocate incoming power demand requests while accounting for the underlying power distribution network and the associated constraints. Typically, this has been formulated as an offline optimization problem for day-ahead scheduling, assuming perfect forecasting of the demands. In pract...

In this paper, a variable learning rate least mean square control algorithm has been proposed to control Dynamic Voltage Restorer for compensating the disturbances present in the supply source side of a distribution network. The proposed control algorithm is equipped with an optimization algorithm based on Slime Mould for the tuning of PI controlle...

In this paper, an energy management system, based on different power balance modes and dynamic grid power flow, is proposed to operate a DC-link microgrid based on a solar photovoltaic generator and battery storage, with the option to request variable power from the grid to meet the load demand. The energy management provides the required reference...

This study proposes a new differential relay characteristic to detect internal faults on bipolar HVDC (high voltage direct current) transmission lines and discriminate accurately and in a timely manner both internal and external faults. In comparison with the conventional differential protection characteristic, the proposed relay characteristic avo...

This paper proposes an optimal adaptive super-twisting sliding-mode control (OASTSMC) via adaptive dynamic programming (ADP) to achieve high precision-positioning for linear stage considering the uncertain nonlinear dynamics of the permanent-magnet synchronous motor (PMSM) servo drive actuator. First, the position of the linear-stage is stabilized...

This paper describes the performance of a dynamic voltage restorer (DVR) using various adaptive controls. The implemented control algorithms are; the amplitude adaptive notch filter (AANF), the quasi newton (QN), and the sliding mode observer (SMO) based control algorithms equipped with optimized PI tuning for three leg voltage sources converter-ba...

In this paper, the Improved Chaotic Electromagnetic Field optimization (ICEFO) algorithm is adopted to generate the optimal values of unknown parameters of fuel cells (FCs). The mathematical model of polymer electrolyte membrane FC (PEMFC) is considered nonlinear and complex optimization problem with different control variables. The sum of squared...