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Nasim Ullah
Department of Electrical Engineering, College of Engineering, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia

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Journal article
Published: 13 August 2021 in Sustainability
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A novel direct reactive power control strategy based on the three-level inverter topology (DRPC-3N) is proposed for a doubly fed induction generator (DFIG)-based wind power plant system. The robustness against parametric variations and control performances of the presented methodology are analyzed under random wind speeds, taking into account the effect of the heating of the windings as well as the saturation of the magnetic circuit. The performance indices include obtaining a sinusoidal AC-generated current with low THD and less ripples in the output. Moreover, the generator can be considered as a reactive power compensator, which allows for the controlling of the active and reactive power of the stator side connected directly to the grid side using only the rotor converter. In this study, unpredictable conduct of the wind velocity that forces the DFIG to operate through all modes of operation in a continual and successive way is considered. The received wind power is utilized to extract the optimum power by using an appropriate MPPT algorithm, and the pitch angle control is activated during the overspeed to restrict the produced active power. The simulation tests are performed under Matlab/Simulink and the presented results show the robustness and effectiveness of the new DRPC strategy with the proposed topology, which means that the performances are more sophisticated.

ACS Style

Salah Tamalouzt; Youcef Belkhier; Younes Sahri; Mohit Bajaj; Nasim Ullah; Shahariar Chowdhury; Teerawet Titseesang; Kuaanan Techato. Enhanced Direct Reactive Power Control-Based Multi-Level Inverter for DFIG Wind System under Variable Speeds. Sustainability 2021, 13, 9060 .

AMA Style

Salah Tamalouzt, Youcef Belkhier, Younes Sahri, Mohit Bajaj, Nasim Ullah, Shahariar Chowdhury, Teerawet Titseesang, Kuaanan Techato. Enhanced Direct Reactive Power Control-Based Multi-Level Inverter for DFIG Wind System under Variable Speeds. Sustainability. 2021; 13 (16):9060.

Chicago/Turabian Style

Salah Tamalouzt; Youcef Belkhier; Younes Sahri; Mohit Bajaj; Nasim Ullah; Shahariar Chowdhury; Teerawet Titseesang; Kuaanan Techato. 2021. "Enhanced Direct Reactive Power Control-Based Multi-Level Inverter for DFIG Wind System under Variable Speeds." Sustainability 13, no. 16: 9060.

Journal article
Published: 25 June 2021 in Materials
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Silicone rubber is a promising insulating material that has been performing well for different insulating and dielectric applications. However, in outdoor applications, environmental stresses cause structural and surface degradations that diminish its insulating properties. This effect of degradation can be reduced with the addition of a suitable filler to the polymer chains. For the investigation of structural changes and hydrophobicity four different systems were fabricated, including neat silicone rubber, a micro composite (with 15% micro-silica filler), and nanocomposites (with 2.5% and 5% nanosilica filler) by subjecting them to various hydrothermal conditions. In general, remarkable results were obtained by the addition of fillers. However, nanocomposites showed the best resistance against the applied stresses. In comparison to neat silicone rubber, the stability of the structure and hydrophobic behavior was better for micro-silica, which was further enhanced in the case of nanocomposites. The inclusion of 5% nanosilica showed the best results before and after applying aging conditions.

ACS Style

Faiza Faiza; Abraiz Khattak; Safi Butt; Kashif Imran; Abasin Ulasyar; Asghar Ali; Zuhair Khan; Azhar Mahmood; Nasim Ullah; Ahmad Alahmadi; Adam Khan. Investigation of Hydrothermally Stressed Silicone Rubber/Silica Micro and Nanocomposite for the Coating High Voltage Insulation Applications. Materials 2021, 14, 3567 .

AMA Style

Faiza Faiza, Abraiz Khattak, Safi Butt, Kashif Imran, Abasin Ulasyar, Asghar Ali, Zuhair Khan, Azhar Mahmood, Nasim Ullah, Ahmad Alahmadi, Adam Khan. Investigation of Hydrothermally Stressed Silicone Rubber/Silica Micro and Nanocomposite for the Coating High Voltage Insulation Applications. Materials. 2021; 14 (13):3567.

Chicago/Turabian Style

Faiza Faiza; Abraiz Khattak; Safi Butt; Kashif Imran; Abasin Ulasyar; Asghar Ali; Zuhair Khan; Azhar Mahmood; Nasim Ullah; Ahmad Alahmadi; Adam Khan. 2021. "Investigation of Hydrothermally Stressed Silicone Rubber/Silica Micro and Nanocomposite for the Coating High Voltage Insulation Applications." Materials 14, no. 13: 3567.

Research article
Published: 25 May 2021 in Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering
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This article proposes a computationally efficient adaptive robust control scheme for a quad-rotor with cable-suspended payloads. Motion of payload introduces unknown disturbances that affect the performance of the quad-rotor controlled with conventional schemes, thus novel adaptive robust controllers with both integer- and fractional-order dynamics are proposed for the trajectory tracking of quad-rotor with cable-suspended payload. The disturbances acting on quad-rotor due to the payload motion are estimated by utilizing adaptive laws derived from integer- and fractional-order Lyapunov functions. The stability of the proposed control systems is guaranteed using integer- and fractional-order Lyapunov theorems. Overall, three variants of the control schemes, namely adaptive fractional-order sliding mode (AFSMC), adaptive sliding mode (ASMC), and classical Sliding mode controllers (SMC)s) are tested using processor in the loop experiments, and based on the two performance indicators, namely robustness and computational resource utilization, the best control scheme is evaluated. From the results presented, it is verified that ASMC scheme exhibits comparable robustness as of SMC and AFSMC, while it utilizes less sources as compared to AFSMC.

ACS Style

Nasim Ullah; Irfan Sami; Wang Shaoping; Hamid Mukhtar; Xingjian Wang; Shahariar Chowdhury; Kuaanan Techato. A computationally efficient adaptive robust control scheme for a quad-rotor transporting cable-suspended payloads. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 2021, 1 .

AMA Style

Nasim Ullah, Irfan Sami, Wang Shaoping, Hamid Mukhtar, Xingjian Wang, Shahariar Chowdhury, Kuaanan Techato. A computationally efficient adaptive robust control scheme for a quad-rotor transporting cable-suspended payloads. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering. 2021; ():1.

Chicago/Turabian Style

Nasim Ullah; Irfan Sami; Wang Shaoping; Hamid Mukhtar; Xingjian Wang; Shahariar Chowdhury; Kuaanan Techato. 2021. "A computationally efficient adaptive robust control scheme for a quad-rotor transporting cable-suspended payloads." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering , no. : 1.

Journal article
Published: 27 April 2021 in Actuators
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Higher efficiency, predictability, and high-power density are the main advantages of a permanent magnet synchronous generator (PMSG)-based hydro turbine. However, the control of a PMSG is a nontrivial issue, because of its time-varying parameters and nonlinear dynamics. This paper suggests a novel optimal fuzzy supervisor passivity-based high order sliding-mode controller to address problems faced by conventional techniques such as PI controls in the machine side. An inherent advantage of the proposed method is that the nonlinear terms are not canceled but compensated in a damped way. The proposed controller consists of two main parts: the fuzzy gain supervisor-PI controller to design the desired dynamic of the system by controlling the rotor speed, and the fuzzy gain-high order sliding-mode control to compute the controller law. The main objectives are feeding the electrical grid with active power, extracting the maximum tidal power, and regulating the reactive power and DC voltage toward their references, whatever the disturbances caused by the PMSG. The main contribution and novelty of the present work consists in the new robust fuzzy supervisory passivity-based high order sliding-mode controller, which treats the mechanical characteristics of the PMSG as a passive disturbance when designing the controller and compensates it. By doing so, the PMSG tracks the optimal speed, contrary to other controls which only take into account the electrical part. The combined high order sliding-mode controller (HSMC) and passivity-based control (PBC) resulted in a hybrid controller law which attempts to greatly enhance the robustness of the proposed approach regardless of various uncertainties. Moreover, the proposed controller was also validated using a processor in the loop (PIL) experiment using Texas Instruments (TI) Launchpad. The control strategy was tested under parameter variations and its performances were compared to the nonlinear control methods. High robustness and high efficiency were clearly illustrated by the proposed new strategy over compared methods under parameter uncertainties using MATLAB/Simulink and a PIL testing platform.

ACS Style

Youcef Belkhier; Abdelyazid Achour; Rabindra Shaw; Nasim Ullah; Shahariar Chowdhury; Kuaanan Techato. Fuzzy Supervisory Passivity-Based High Order-Sliding Mode Control Approach for Tidal Turbine-Based Permanent Magnet Synchronous Generator Conversion System. Actuators 2021, 10, 92 .

AMA Style

Youcef Belkhier, Abdelyazid Achour, Rabindra Shaw, Nasim Ullah, Shahariar Chowdhury, Kuaanan Techato. Fuzzy Supervisory Passivity-Based High Order-Sliding Mode Control Approach for Tidal Turbine-Based Permanent Magnet Synchronous Generator Conversion System. Actuators. 2021; 10 (5):92.

Chicago/Turabian Style

Youcef Belkhier; Abdelyazid Achour; Rabindra Shaw; Nasim Ullah; Shahariar Chowdhury; Kuaanan Techato. 2021. "Fuzzy Supervisory Passivity-Based High Order-Sliding Mode Control Approach for Tidal Turbine-Based Permanent Magnet Synchronous Generator Conversion System." Actuators 10, no. 5: 92.

Journal article
Published: 26 April 2021 in Polymers
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The scope of silicone rubber (SiR) is confined due to the deprivation of its dielectric propertiesupon exposure to various ambient stresses. The aim of this research is to develop silicone rubber-based composites by employing inorganic oxide fillers for improved dielectric and high voltage insulation properties for widening its scope in the field of electrical appliances. This study reports the preparation of different composites of silicone rubber with varying concentrations of micro and nano-silica fillers. The dielectric propertytrends of these as-prepared neat and impregnated samples were examined via an indigenously developed weathering chamber capable of applying multiple stresses of acid rain, heat, humidity, UVA radiation, and salt fog. Dielectric constant values were measured before and after applying stresses. Upon applying stresses, a periodic decline in dielectric constant was observed. Improved dielectric properties were obtained by adding micro and nano-silica as fillers. A nano silica-incorporated silicone rubber product exhibited good potential for dual applications as dielectric and high voltage insulation.

ACS Style

Faiza Faiza; Abraiz Khattak; Aqeel Rehman; Asghar Ali; Azhar Mahmood; Kashif Imran; Abasin Ulasyar; Haris Sheh Zad; Nasim Ullah; Adam Khan. Multi-Stressed Nano and Micro-Silica/Silicone Rubber Composites with Improved Dielectric and High-Voltage Insulation Properties. Polymers 2021, 13, 1400 .

AMA Style

Faiza Faiza, Abraiz Khattak, Aqeel Rehman, Asghar Ali, Azhar Mahmood, Kashif Imran, Abasin Ulasyar, Haris Sheh Zad, Nasim Ullah, Adam Khan. Multi-Stressed Nano and Micro-Silica/Silicone Rubber Composites with Improved Dielectric and High-Voltage Insulation Properties. Polymers. 2021; 13 (9):1400.

Chicago/Turabian Style

Faiza Faiza; Abraiz Khattak; Aqeel Rehman; Asghar Ali; Azhar Mahmood; Kashif Imran; Abasin Ulasyar; Haris Sheh Zad; Nasim Ullah; Adam Khan. 2021. "Multi-Stressed Nano and Micro-Silica/Silicone Rubber Composites with Improved Dielectric and High-Voltage Insulation Properties." Polymers 13, no. 9: 1400.

Journal article
Published: 19 April 2021 in Mathematics
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This research work is focused on the nonlinear modeling and control of a hydrostatic thrust bearing. In the proposed work, a mathematical model is formulated for a hydrostatic thrust bearing system that includes the effects of uncertainties, unmodelled dynamics, and nonlinearities. Depending on the type of inputs, the mathematical model is divided into three subsystems. Each subsystem has the same output, i.e., fluid film thickness with different types of input, i.e., viscosity, supply pressure, and recess pressure. An extended state observer is proposed to estimate the unavailable states. A backstepping control technique is presented to achieve the desired tracking performance and stabilize the closed-loop dynamics. The proposed control technique is based on the Lyapunov stability theorem. Moreover, particle swarm optimization is used to search for the best tuning parameters for the backstepping controller and extended state observer. The effectiveness of the proposed method is verified using numerical simulations.

ACS Style

Waheed Rehman; Wakeel Khan; Nasim Ullah; M. Chowdhury; Kuaanan Techato; Muhammad Haneef. Nonlinear Control of Hydrostatic Thrust Bearing Using Multivariable Optimization. Mathematics 2021, 9, 903 .

AMA Style

Waheed Rehman, Wakeel Khan, Nasim Ullah, M. Chowdhury, Kuaanan Techato, Muhammad Haneef. Nonlinear Control of Hydrostatic Thrust Bearing Using Multivariable Optimization. Mathematics. 2021; 9 (8):903.

Chicago/Turabian Style

Waheed Rehman; Wakeel Khan; Nasim Ullah; M. Chowdhury; Kuaanan Techato; Muhammad Haneef. 2021. "Nonlinear Control of Hydrostatic Thrust Bearing Using Multivariable Optimization." Mathematics 9, no. 8: 903.

Journal article
Published: 16 April 2021 in Actuators
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A dual mover yokeless multi-tooth (DMYMT) permanent magnet flux switching motor (PM-FSM) design is presented in this article for ropeless elevator applications. The excitation sources, including a field winding and permanent magnet, are on the short mover in the proposed design structure, whereas the stator is a simple slotted iron core, thus reducing the vertical transportation system cost. The operational principle of the proposed DMYMT in PM-FSM is introduced. The proposed dual mover yokeless multi-tooth Permanent Magnet Flux Switching Motor is analyzed and compared for various performance parameters in a Finite Element Analysis package. The proposed machine has high thrust force and cost-effectiveness compared to conventional dual permanent magnet motor. Finally, this paper also develops an analytical model for the proposed structure, validated by comparing it with Finite Element Analysis simulation results. Results show good agreement between analytical prediction and Finite Element Analysis results.

ACS Style

Atif Zahid; Faisal Khan; Naseer Ahmad; Irfan Sami; Wasiq Ullah; Nasim Ullah; Noman Ullah; Hend Alkhammash. Design and Analysis of Dual Mover Multi-Tooth Permanent Magnet Flux Switching Machine for Ropeless Elevator Applications. Actuators 2021, 10, 81 .

AMA Style

Atif Zahid, Faisal Khan, Naseer Ahmad, Irfan Sami, Wasiq Ullah, Nasim Ullah, Noman Ullah, Hend Alkhammash. Design and Analysis of Dual Mover Multi-Tooth Permanent Magnet Flux Switching Machine for Ropeless Elevator Applications. Actuators. 2021; 10 (4):81.

Chicago/Turabian Style

Atif Zahid; Faisal Khan; Naseer Ahmad; Irfan Sami; Wasiq Ullah; Nasim Ullah; Noman Ullah; Hend Alkhammash. 2021. "Design and Analysis of Dual Mover Multi-Tooth Permanent Magnet Flux Switching Machine for Ropeless Elevator Applications." Actuators 10, no. 4: 81.

Journal article
Published: 09 April 2021 in Electronics
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Hybrid architectures integrating a processor with an SRAM-based FPGA fabric—for example, Xilinx ZynQ SoC—are increasingly being used as a single-chip solution in several market segments to replace multi-chip designs. These devices not only provide advantages in terms of logic density, cost and integration, but also provide run-time in-field reconfiguration capabilities. However, the current reconfiguration capabilities provided by vendor tools are limited to the module level. Therefore, incremental run-time configuration memory changes require a lengthy compilation time for off-line bitstream generation along with storage and reconfiguration time overheads with traditional vendor methodologies. In this paper, an internal configuration access port (ICAP) controller that provides a versatile fine-grain resource-level incremental reconfiguration of the programmable logic (PL) resources in ZynQ SoC is presented. The proposed controller implemented in PL, called VR-ZyCAP, can reconfigure look-up tables (LUTs) and Flip-Flops (FF). The run-time reconfiguration of FF is achieved through a reset after reconfiguration (RAR)-featured partial bitstream to avoid the unintended state corruption of other memory elements. Along with versatility, our proposed controller improves the reconfiguration time by 30 times for FFs compared to state-of-the-art works while achieving a nearly 400-fold increase in speed for LUTs when compared to vendor-supported software approaches. In addition, it achieves competitive resource utilization when compared to existing approaches.

ACS Style

Bushra Sultana; Anees Ullah; Arsalan Malik; Ali Zahir; Pedro Reviriego; Fahad Muslim; Nasim Ullah; Waleed Ahmad. VR-ZYCAP: A Versatile Resourse-Level ICAP Controller for ZYNQ SOC. Electronics 2021, 10, 899 .

AMA Style

Bushra Sultana, Anees Ullah, Arsalan Malik, Ali Zahir, Pedro Reviriego, Fahad Muslim, Nasim Ullah, Waleed Ahmad. VR-ZYCAP: A Versatile Resourse-Level ICAP Controller for ZYNQ SOC. Electronics. 2021; 10 (8):899.

Chicago/Turabian Style

Bushra Sultana; Anees Ullah; Arsalan Malik; Ali Zahir; Pedro Reviriego; Fahad Muslim; Nasim Ullah; Waleed Ahmad. 2021. "VR-ZYCAP: A Versatile Resourse-Level ICAP Controller for ZYNQ SOC." Electronics 10, no. 8: 899.

Journal article
Published: 31 March 2021 in Sensors
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Recently, formation flying of multiple unmanned aerial vehicles (UAVs) found numerous applications in various areas such as surveillance, industrial automation and disaster management. The accuracy and reliability for performing group tasks by multiple UAVs is highly dependent on the applied control strategy. The formation and trajectories of multiple UAVs are governed by two separate controllers, namely formation and trajectory tracking controllers respectively. In presence of environmental effects, disturbances due to wind and parametric uncertainties, the controller design process is a challenging task. This article proposes a robust adaptive formation and trajectory tacking control of multiple quad-rotor UAVs using super twisting sliding mode control method. In the proposed design, Lyapunov function-based adaptive disturbance estimators are used to compensate for the effects of external disturbances and parametric uncertainties. The stability of the proposed controllers is guaranteed using Lyapunov theorems. Two variants of the control schemes, namely fixed gain super twisting SMC (STSMC) and adaptive super twisting SMC (ASTSMC) are tested using numerical simulations performed in MATLAB/Simulink. From the results presented, it is verified that in presence of disturbances, the proposed ASTSMC controller exhibits enhanced robustness as compared to the fixed gain STSMC.

ACS Style

Yasir Mehmood; Jawad Aslam; Nasim Ullah; Shahariar Chowdhury; Kuaanan Techato; Ali Alzaed. Adaptive Robust Trajectory Tracking Control of Multiple Quad-Rotor UAVs with Parametric Uncertainties and Disturbances. Sensors 2021, 21, 2401 .

AMA Style

Yasir Mehmood, Jawad Aslam, Nasim Ullah, Shahariar Chowdhury, Kuaanan Techato, Ali Alzaed. Adaptive Robust Trajectory Tracking Control of Multiple Quad-Rotor UAVs with Parametric Uncertainties and Disturbances. Sensors. 2021; 21 (7):2401.

Chicago/Turabian Style

Yasir Mehmood; Jawad Aslam; Nasim Ullah; Shahariar Chowdhury; Kuaanan Techato; Ali Alzaed. 2021. "Adaptive Robust Trajectory Tracking Control of Multiple Quad-Rotor UAVs with Parametric Uncertainties and Disturbances." Sensors 21, no. 7: 2401.

Journal article
Published: 30 March 2021 in Applied Sciences
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The attractive features of the direct AC-AC converters increase their use in many applications such as voltage control for a heavy-duty load that has a high time constant, AC machine drives, and heating systems based on the induction process. These converters process power in single-stage having simple circuit topologies with reduced switching devices and circuit components. These characteristics lead to the efficient power conversion process. The use of a low-frequency input transformer with multiple output tapping for the regulation of output voltage and frequency is one of the major sources of cost, size, and conversion losses. The complication in the switching algorithms is also the main concern in these converters. The preceding deficiencies lower their potency to be used in daily life. The costly controllers or processors are to be employed to realize the complex control techniques or algorithms. That increases the overall cost and circuit complication. This paper introduces the simple control techniques employed to a novel transformer less multi converter to have the various ac outputs for voltage and frequency regulation. The validation of power circuit and control schemes is tested through the simulation and practical results obtained in Simulink and practical setup respectively.

ACS Style

Naveed Ashraf; Ghulam Abbas; Irfan Khan; Ali Raza; Nasim Ullah. A Transformer-Less Multiconverter Having Output Voltage and Frequency Regulation Characteristics, Employed with Simple Switching Algorithms. Applied Sciences 2021, 11, 3075 .

AMA Style

Naveed Ashraf, Ghulam Abbas, Irfan Khan, Ali Raza, Nasim Ullah. A Transformer-Less Multiconverter Having Output Voltage and Frequency Regulation Characteristics, Employed with Simple Switching Algorithms. Applied Sciences. 2021; 11 (7):3075.

Chicago/Turabian Style

Naveed Ashraf; Ghulam Abbas; Irfan Khan; Ali Raza; Nasim Ullah. 2021. "A Transformer-Less Multiconverter Having Output Voltage and Frequency Regulation Characteristics, Employed with Simple Switching Algorithms." Applied Sciences 11, no. 7: 3075.

Journal article
Published: 27 March 2021 in Sustainability
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A permanent magnet synchronous generator (PMSG) in s grid-connected tidal energy conversion system presents numerous advantages such as high-power density and ease of maintenance. However, the nonlinear properties of the generator and parametric uncertainties make the controller design more than a simple challenge. Within this paper we present a new combined passivity-based voltage control (PBVC) with a nonlinear observer. The PBVC is used to design the desired dynamics of the system, while the nonlinear observer serves to reconstruct the measured signals. A high order sliding-mode based fuzzy supervisory approach is selected to design the desired dynamics. This paper addresses the following two main parts: controlling the PMSG to guarantee the maximum tidal power extraction and integrate into to the grid-side converter (GSC), for this the new controller is proposed. The second task is to regulate the generated reactive power and the DC-link voltage to their references under any disturbances related to the machine-side converter (MSC). Furthermore, the robustness of the controller against parameter changes was taken into consideration. The developed controller is tested under parameter variations and compared to benchmark nonlinear control methods. Numerical simulations are performed in MATLAB/Simulink which clearly demonstrates the robustness of the proposed technique over the compared control methods. Moreover, the proposed controller is also validated using a processor in the loop (PIL) experiment using Texas Instruments (TI) Launchpad.

ACS Style

Youcef Belkhier; Abdelyazid Achour; Rabindra Shaw; Nasim Ullah; Shahariar Chowdhury; Kuaanan Techato. Energy-Based Combined Nonlinear Observer and Voltage Controller for a PMSG Using Fuzzy Supervisor High Order Sliding Mode in a Marine Current Power System. Sustainability 2021, 13, 3737 .

AMA Style

Youcef Belkhier, Abdelyazid Achour, Rabindra Shaw, Nasim Ullah, Shahariar Chowdhury, Kuaanan Techato. Energy-Based Combined Nonlinear Observer and Voltage Controller for a PMSG Using Fuzzy Supervisor High Order Sliding Mode in a Marine Current Power System. Sustainability. 2021; 13 (7):3737.

Chicago/Turabian Style

Youcef Belkhier; Abdelyazid Achour; Rabindra Shaw; Nasim Ullah; Shahariar Chowdhury; Kuaanan Techato. 2021. "Energy-Based Combined Nonlinear Observer and Voltage Controller for a PMSG Using Fuzzy Supervisor High Order Sliding Mode in a Marine Current Power System." Sustainability 13, no. 7: 3737.

Preprint
Published: 05 February 2021
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In this paper we designed system for smart university building based on artificial intelligence (AI) and internet of things (IOT). Our idea can be summarized in smart security system that has different sensors to detect the surrounding environment of the class room in campus which keep everyone and everything on campus safer. By using (IOT), (AI) technologies and applications and by using microcontroller programming we can make the university building safer, secure and more energy saves.

ACS Style

Yahya Salameh Hassan Khraisat; Ahmad A. Alahmadi; Nasim Ullah; H. Abeida; Yasser M. Alharbi; Mohamed S. Soliman. A Smart University Building Based on Artificial Intelligence and the Internet of Things. 2021, 1 .

AMA Style

Yahya Salameh Hassan Khraisat, Ahmad A. Alahmadi, Nasim Ullah, H. Abeida, Yasser M. Alharbi, Mohamed S. Soliman. A Smart University Building Based on Artificial Intelligence and the Internet of Things. . 2021; ():1.

Chicago/Turabian Style

Yahya Salameh Hassan Khraisat; Ahmad A. Alahmadi; Nasim Ullah; H. Abeida; Yasser M. Alharbi; Mohamed S. Soliman. 2021. "A Smart University Building Based on Artificial Intelligence and the Internet of Things." , no. : 1.

Journal article
Published: 18 December 2020 in Mathematical Modelling of Engineering Problems
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Standalone DC micro-grid requires highly efficient power converters with high performance robust controllers. This research work deals with the hardware implementation of a load side buck converter and its control system integrated in a DC micro-grid system. This paper presents a novel fractional order sliding mode control (FSMC) method for voltage regulation of a buck converter feeding a constant power load. FSMC controller is derived based on the average state space model of the buck converter and its stability is verified using Lyapunov theorem. Finally, the FSMC controller is implemented using Arduino mega 2560 processor and the obtained results are compared with classical sliding mode control (SMC), proportional, integral, derivative (PID) control and fractional order PID control system (FOPID under constant and variable resistive loading.

ACS Style

Nasim Ullah. Fractional Order Sliding Mode Control Design for a Buck Converter Feeding Resistive Power Loads. Mathematical Modelling of Engineering Problems 2020, 7, 649 -658.

AMA Style

Nasim Ullah. Fractional Order Sliding Mode Control Design for a Buck Converter Feeding Resistive Power Loads. Mathematical Modelling of Engineering Problems. 2020; 7 (4):649-658.

Chicago/Turabian Style

Nasim Ullah. 2020. "Fractional Order Sliding Mode Control Design for a Buck Converter Feeding Resistive Power Loads." Mathematical Modelling of Engineering Problems 7, no. 4: 649-658.

Journal article
Published: 07 November 2020 in Healthcare
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The multidisciplinary nature of the work required for research in the COVID-19 pandemic has created new challenges for health professionals in the battle against the virus. They need to be equipped with novel tools, applications, and resources—that have emerged during the pandemic—to gain access to breakthrough findings; know the latest developments; and to address their specific needs for rapid data acquisition, analysis, evaluation, and reporting. Because of the complex nature of the virus, healthcare systems worldwide are severely impacted as the treatment and the vaccine for COVID-19 disease are not yet discovered. This leads to frequent changes in regulations and policies by governments and international organizations. Our analysis suggests that given the abundance of information sources, finding the most suitable application for analysis, evaluation, or reporting, is one of such challenges. However, health professionals and policy-makers need access to the most relevant, reliable, trusted, and latest information and applications that can be used in their day-to-day tasks of COVID-19 research and analysis. In this article, we present our analysis of various novel and important web-based applications that have been specifically developed during the COVID-19 pandemic and that can be used by the health professionals community to help in advancing their analysis and research. These applications comprise search portals and their associated information repositories for literature and clinical trials, data sources, tracking dashboards, and forecasting models. We present a list of the minimally essential online, web-based applications to serve a multitude of purposes, from hundreds of those developed since the beginning of the pandemic. A critical analysis is provided for the selected applications based on 17 features that can be useful for researchers and analysts for their evaluations. These features make up our evaluation framework and have not been used previously for analysis and evaluation. Therefore, knowledge of these applications will not only increase productivity but will also allow us to explore new dimensions for using existing applications with more control, better management, and greater outcome of their research. In addition, the features used in our framework can be applied for future evaluations of similar applications and health professionals can adapt them for evaluation of other applications not covered in this analysis.

ACS Style

Hamid Mukhtar; Hafiz Ahmad; Muhammad Khan; Nasim Ullah. Analysis and Evaluation of COVID-19 Web Applications for Health Professionals: Challenges and Opportunities. Healthcare 2020, 8, 466 .

AMA Style

Hamid Mukhtar, Hafiz Ahmad, Muhammad Khan, Nasim Ullah. Analysis and Evaluation of COVID-19 Web Applications for Health Professionals: Challenges and Opportunities. Healthcare. 2020; 8 (4):466.

Chicago/Turabian Style

Hamid Mukhtar; Hafiz Ahmad; Muhammad Khan; Nasim Ullah. 2020. "Analysis and Evaluation of COVID-19 Web Applications for Health Professionals: Challenges and Opportunities." Healthcare 8, no. 4: 466.

Journal article
Published: 03 November 2020 in ISA Transactions
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A high-performance control system is essential to transfer maximum power from WECS to the utility grid. In this paper, a fuzzy fractional-order terminal sliding mode control (Fuzzy-FOSMC) is presented based on the boundary layer approach. This boundary layer approach leads to the trade-off between chattering elimination and control performances. The reaching control part of the FOTSMC is replaced by a fuzzy system that eliminates the chattering even in the presence of lumped parametric uncertainties. The fuzzy control part is designed such that:(a) it maintains the stability of the system by introducing a non-linear slope inside the thin boundary layer near the sliding surface, and (b) it eliminates the chattering by acting like a saturation function. A novel wind speed estimation technique is also proposed in this paper based on Gaussian process regression (GPR). The inputs to the GPR framework are selected as the wind turbine power and its rotational speed. The superior performance of the proposed wind speed estimation technique is verified using error comparison with pre-existing techniques. The stability of the proposed GPR-based Fuzzy-FOSMC control paradigm is ensured by using the Lyapunov stability theorem. The proposed paradigm is compared with benchmark sliding mode control (SMC) and FOTSMC strategies. The proposed Fuzzy-FOSMC performance in terms of chattering elimination and stability is validated under normal conditions and lumped parametric uncertainties using extensive simulations in Matlab/SIMULINK and processor in the loop based experimental workbench.

ACS Style

Irfan Sami; Shafaat Ullah; Nasim Ullah; Jong-Suk Ro. Sensorless fractional order composite sliding mode control design for wind generation system. ISA Transactions 2020, 111, 275 -289.

AMA Style

Irfan Sami, Shafaat Ullah, Nasim Ullah, Jong-Suk Ro. Sensorless fractional order composite sliding mode control design for wind generation system. ISA Transactions. 2020; 111 ():275-289.

Chicago/Turabian Style

Irfan Sami; Shafaat Ullah; Nasim Ullah; Jong-Suk Ro. 2020. "Sensorless fractional order composite sliding mode control design for wind generation system." ISA Transactions 111, no. : 275-289.

Journal article
Published: 01 November 2020 in Energy Reports
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This paper proposes fractional and integer order sliding mode controllers (SMC) for the high voltage (HV) bridge control in a bidirectional dual active (DAB) converter. The proposed controllers are derived based on nonlinear model of DAB converter and the closed loop stability is ensured using integer and fractional order Lyapunov theorems. Fractional order controllers offer more degree of freedom to adjust the desired response of the system, however the implementation issues of such controllers are rarely explored. Both variants of control schemes are implemented on a DSP control card, and hardware-in-the-loop (HIL) and processor-in-the-loop (PIL) experiments are conducted using rapid control prototyping technique. In order to choose the most suitable robust controller, experimental data for the two performance indices namely robustness and computational resources utilization is compared for both integer and fractional order control schemes. The experimental results demonstrate that the integer order SMC utilizes reduced computational resources as compared to the fractional order SMC. Moreover it is further verified that integer order SMC exhibits comparable robustness as fractional order SMC under all test conditions.

ACS Style

Nasim Ullah; Zaheer Farooq; Taimur Zaman; Irfan Sami; Asier Ibeas; Kuaanan Techato; Shahariar Chowdhury; S.M. Muyeen. A computationally efficient robust voltage control for a single phase dual active bridge. Energy Reports 2020, 6, 3346 -3356.

AMA Style

Nasim Ullah, Zaheer Farooq, Taimur Zaman, Irfan Sami, Asier Ibeas, Kuaanan Techato, Shahariar Chowdhury, S.M. Muyeen. A computationally efficient robust voltage control for a single phase dual active bridge. Energy Reports. 2020; 6 ():3346-3356.

Chicago/Turabian Style

Nasim Ullah; Zaheer Farooq; Taimur Zaman; Irfan Sami; Asier Ibeas; Kuaanan Techato; Shahariar Chowdhury; S.M. Muyeen. 2020. "A computationally efficient robust voltage control for a single phase dual active bridge." Energy Reports 6, no. : 3346-3356.

Preprint
Published: 23 October 2020
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The multidisciplinary nature of the work required for research in the Covid-19 pandemic has created new challenges for health professionals in the battle against the virus. They need to be equipped with novel tools and resources ---that have emerged during the pandemic--- to gain access to breakthrough findings, know the latest developments, and to address their specific needs for rapid data acquisition, analysis, evaluation, and reporting. Because of the complex nature of the virus, the healthcare systems worldwide are severely impacted as the treatment and the vaccine for Covid-19 disease are not yet discovered. This leads to frequent changes in regulations and policies by governments and international organizations. Our analysis suggests that given the abundance of information sources, finding the most suitable tool for a given task is one of such challenges. But health professionals and policymakers need access to the most relevant, reliable, trusted, and latest information and tools that can be used in their day-to-day tasks of Covid-19 research and analysis. In this article, we present our analysis of various novel and important tools that have been specifically developed during the Covid-19 pandemic and that can be used by the health professionals community to help in advancing their analysis and research. These tools comprise of search engines, information repositories for literature and clinical trials, data sources, dashboards, and forecasting models. We present list of the minimally essential tools to serve a multitude of purposes, from hundreds of those developed since the beginning of the pandemic. A critical analysis is provided for the selected tools based on 17 parameters that can be useful for researchers and analysts for their evaluations. These parameters make up our evaluation framework and have not been used previously for analysis and evaluation. Hence, knowledge of the tools will not only increase the productivity but will also allow to explore new dimensions for using existing tools with more control, better management, and greater outcome of their research. In addition, the parameters used in our framework can be applied for future evaluations of similar tools and health professionals can adapt them for evaluation of other tools not covered in this analysis.

ACS Style

Hamid Mukhtar; Hafiz Ahmad; Muhammad Khan; Nasim Ullah. Analysis and Evaluation of Covid-19 Tools for Health Professionals: Challenges and Opportunities. 2020, 1 .

AMA Style

Hamid Mukhtar, Hafiz Ahmad, Muhammad Khan, Nasim Ullah. Analysis and Evaluation of Covid-19 Tools for Health Professionals: Challenges and Opportunities. . 2020; ():1.

Chicago/Turabian Style

Hamid Mukhtar; Hafiz Ahmad; Muhammad Khan; Nasim Ullah. 2020. "Analysis and Evaluation of Covid-19 Tools for Health Professionals: Challenges and Opportunities." , no. : 1.

Research article
Published: 01 August 2020 in IET Systems Biology
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This study designs a robust closed-loop control algorithm for elevated blood glucose level stabilisation in type 1 diabetic patients. The control algorithm is based on a novel control action resulting from integrating algebraic meal disturbance estimator with back-stepping integral sliding mode control (BISMC) technique. The estimator shows finite time convergence leading to accurate and fast estimation of meal disturbance. Moreover, compensation of the estimated disturbance in controller provides significant reduction in chattering phenomenon, which is inherent drawback of sliding mode control (SMC). The controller is applied to one of the most reliable models of type 1 diabetic patients, named Bergman's minimal model. The effectiveness and superiority of the designed controller is shown by comparing it to classical SMC and super-twisting sliding mode control. The designed controller is subject to three different cases for detailed analysis of the controller's robustness against meal disturbance. The three cases considered are hyperglycaemia, hyperglycaemia combined with meal disturbance and three meal disturbance. The simulation results confirm superior performance of algebraic disturbance estimator based BISMC controller for all the cases mentioned above.

ACS Style

Nasim Ullah; Al‐Sharef Muhammad. Novel algebraic meal disturbance estimation based adaptive robust control design for blood glucose regulation in type 1 diabetes patients. IET Systems Biology 2020, 14, 200 -210.

AMA Style

Nasim Ullah, Al‐Sharef Muhammad. Novel algebraic meal disturbance estimation based adaptive robust control design for blood glucose regulation in type 1 diabetes patients. IET Systems Biology. 2020; 14 (4):200-210.

Chicago/Turabian Style

Nasim Ullah; Al‐Sharef Muhammad. 2020. "Novel algebraic meal disturbance estimation based adaptive robust control design for blood glucose regulation in type 1 diabetes patients." IET Systems Biology 14, no. 4: 200-210.

Journal article
Published: 13 July 2020 in IEEE Access
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This paper designs an intelligent energy management control for a stand alone smart DC- micro-grid using super twisting fractional order method. Based on mathematical model of the micro-grid, controllers are derived for the source side converters such as photovoltaic (PV),wind, AC grid and battery management system, and load side converters. Based on the available measured input and consumed output power, an intelligent energy management algorithm decides the appropriate mode of operation for the source and load side converters controller. All DC loads connected to the micro-grid are treated as essential loads and no load shedding can be allowed by the energy management unit. The energy management unit prioritizes the renewable energy sources (PV and wind) in order to make the micro-grid as cost effective. The performance of the proposed control scheme is compared with the integer order controller and the system is simulated in MATLAB/SIMULINK environment for different test cases.

ACS Style

Yasser Mohammed Alharbi; Ahmad Aziz Al Alahmadi; Nasim Ullah; Habti Abeida; Mohamed S. Soliman; Yahya Salameh Hassan Khraisat. Super Twisting Fractional Order Energy Management Control for a Smart University System Integrated DC Micro-Grid. IEEE Access 2020, 8, 128692 -128704.

AMA Style

Yasser Mohammed Alharbi, Ahmad Aziz Al Alahmadi, Nasim Ullah, Habti Abeida, Mohamed S. Soliman, Yahya Salameh Hassan Khraisat. Super Twisting Fractional Order Energy Management Control for a Smart University System Integrated DC Micro-Grid. IEEE Access. 2020; 8 ():128692-128704.

Chicago/Turabian Style

Yasser Mohammed Alharbi; Ahmad Aziz Al Alahmadi; Nasim Ullah; Habti Abeida; Mohamed S. Soliman; Yahya Salameh Hassan Khraisat. 2020. "Super Twisting Fractional Order Energy Management Control for a Smart University System Integrated DC Micro-Grid." IEEE Access 8, no. : 128692-128704.

Original article
Published: 03 June 2020 in Research on Biomedical Engineering
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Commercially available electrosurgical generator (ESG) depends on circuit topologies that are responsive to changes in resistance of the tissue. This change in resistance varies the amount of power delivered, especially amid arcing. Changes in resistance along the body make it even harder to keep the power delivery and voltage in limits. An important property of ESG is to be able to keep the output power constant in the constant power region. In this work, a closed-loop control system is designed and tested for ESG to improve its performance in the nonlinear constant power region. A quantitative study of a buck converter and boost inverter is presented along with the closed-loop response for the ESG unit. A comparative analysis of two control methods, i.e., proportional integral derivative (PID) and proportional integral derivative sliding mode control (PIDSMC), is presented for the ESG unit. Results confirm that the presented closed-loop system can highly improve the performance of the ESG system and PIDSMC is found to be a more suitable choice.

ACS Style

Shah Fahad; Naseer Ullah; Ali Jafer Mahdi; Nasim Ullah. A new robust closed-loop control system for electrosurgical generators. Research on Biomedical Engineering 2020, 36, 213 -224.

AMA Style

Shah Fahad, Naseer Ullah, Ali Jafer Mahdi, Nasim Ullah. A new robust closed-loop control system for electrosurgical generators. Research on Biomedical Engineering. 2020; 36 (3):213-224.

Chicago/Turabian Style

Shah Fahad; Naseer Ullah; Ali Jafer Mahdi; Nasim Ullah. 2020. "A new robust closed-loop control system for electrosurgical generators." Research on Biomedical Engineering 36, no. 3: 213-224.