Abdelkarim Daud

Abdelkarim Daud

Palestine Polytechnic University

H-index: 7

Asia-Palestinian Territory

Abdelkarim Daud Information

University

Palestine Polytechnic University

Position

Prof. of Electrical Engineering

Citations(all)

461

Citations(since 2020)

206

Cited By

333

hIndex(all)

7

hIndex(since 2020)

5

i10Index(all)

4

i10Index(since 2020)

4

Email

University Profile Page

Palestine Polytechnic University

Abdelkarim Daud Skills & Research Interests

Electrical Machines

Electrical Drives

Renewable Energy

Top articles of Abdelkarim Daud

The Behaviours of Various DC Choppers during Shading Occurrence in PV Systems

This paper investigates how the DC choppers behave during the shading occurrence at different time intervals of the year. Three types of DC choppers are implemented during the same shading conditions and intervals of time. The studied parameters are the duty cycle, output power, current, and switch losses. The mathematical model is built and implemented using the MATLAB/Simulink platform. The obtained results show that the SEPIC converter has the highest rate of duty cycle, which means more switching losses are generated. Concerning the average output power, the Modified Single Ended Primary Converter (MSEPIC) has the highest rate, while the Boost Converter has the lowest rate. The MPP power, duty cycle, and switching losses are studied under various shading rates. The duty cycle has the highest rate on the SEPIC converter, while MSEPIC has the lowest rate. Despite that, the switching losses are tremendously high at MSEPIC compared to SEPIC converters. Furthermore, simulation studies show that Boost and SEPIC converters have better performance in frequent cloudy weather conditions.

Authors

Sameer Khader,Abdel-Karim Daud

Journal

WSEAS Transactions on Circuits and Systems

Published Date

2024

A Novel Approach to Fast Determining the Maximum Power Point Based on Photovoltaic Panel’s Datasheet

This study proposes a novel approach to fast and direct determination of the Maximum Power Point (MPP) at any value of solar irradiation and cell temperature, without applying further mathematical processing to operate at that point. The current approach aims to reduce algorithm complexity, time consumption during the iteration, and oscillation to reach the point at which the panel generates maximum possible power. For avoiding or eliminating these drawbacks, the chopper duty cycle (D) at which the panel-generated power should be the maximum is determined using the panel datasheet with respect to voltage and power at different irradiation rates (G). Mathematical equations are derived for MPP voltage and power at any value of solar irradiation using the manufacturer Photovoltaic (PV) specification. The simulation results obtained by MATLAB/SIMULINK platform showed that the power had a linear change, while the voltage had a nonlinear one with narrow variations.  The yield duty cycle controls the Modified Single Ended Primary Converter (MSEPIC) that regulates the load voltage through a wide range below and above the rated panel voltage. The simulation results showed the fast response of chopper operation with a negligible starting time required by the MPPT algorithm, no duty cycle oscillation, and shorter iteration time. Furthermore, the conducted approach is validated based on the data published in a reputed journal, and the obtained results gave rise to new aspects that helped reduce dependency on conventional MPPT algorithms and, consequently, enhance the system response, efficiency and cost reduction.

Authors

Sameer Hanna Khader,Abdel-Karim Khalid Daud

Journal

Journal of Renewable Energy and Environment

Published Date

2023/12/1

Irradiation and Temperature effects on Modified SEPIC Converter Performance for PV Systems

The changing position and nature of the sun due to changes in ambient temperature and irradiance level throughout the day is the main difficulty with photovoltaic (PV) systems. This leads to fluctuations in power levels. Therefore, maximum power point tracking (MPPT) under these conditions is the main challenge. This paper proposes a new approach for directly operating at the maximum power point (MPP) at any value of solar irradiation and cell temperature without applying further mathematical processing to operate at that point. This technique is applied to a PV system containing a high-static-gain modified single-ended primary coil MSEPIC converter, which is characterized by high efficiency and high gain voltage. The performance of this converter is obtained with respect to load and output voltage variation under different climatic conditions in Hebron, Palestine. Solar panel type LG450N2W-E6 is selected as the PV generator in this system with 450 W at 41.1 V at MPP. The proposed model is analyzed and simulated in Matlab/Simulink, and m-file code.

Authors

Abdel-Karim Daud,Sameer Khader

Journal

WSEAS Transactions on Power Systems

Published Date

2023

Comparison Analysis between Various Boost Chopper Configurations

This paper investigates the behaviors of various configuration of Boost DC chopper used in Photovoltaic energy systems or in various voltage regulators. The targeted boost converters are conventional Buck-Boost (BB), traditional single ended primary coil (TSEPIC) and modified single ended primary coil (MSEPIC). The comparison analysis in based on studying the chopper behaviors with respect to the modulation frequency, then studying the chopper behaviors with respect to duty operation cycle at optimized frequency. The subjected parameters are output voltage ripple, current ripples, overall efficiency, source current and voltage gain. A mathematical model for up mentioned performances is derived and a simulation model using Matlab/Simulink platforms is conducted to follow these behaviors. Simulation results indicate that each of those choppers has certain switching frequency at which they have optimized performances with respect to voltage gain and efficiency. Then there are optimized operation at certain frequency and duty cycle. MSEPIC converter indicates that with respect to efficiency, voltage gain and ripples that displayed better performances comparing with other converters, where the efficiency approaches 98% and the voltage gain exceeds 19 times the input voltage at duty cycle of 90% while the other converters have 3 times the source voltage. With respect to voltage and current ripples MSEPIC displayed minimum values where∆ Vo is less than 0.7%. The conducted simulations confirm the better utilization and importance for using MSEPIC rather that either BB or TSEPIC with respect to voltage gain, efficiency, current stress …

Authors

Abdel-Karim Daud,Sameer Khader

Journal

International Journal of Circuits and Electronics

Published Date

2022/8/2

Closed Loop Modified SEPIC Converter for Photovoltaic System

The high static gain modified single ended primary coil (MSEPIC) converter is presented in this paper. The proposed converter presents low switch voltage and high efficiency for low input voltage and high output voltage applications. The configuration of MSEPIC converter is presented and analyzed. Closed loop feedback control with PID controller based on triggering system is developed for MSEPIC converter to maintain constant output voltage. Furthermore, the model is integrated with Photovoltaic generator where the input voltage and current depend on the solar irradiation rates. The proposed model is analyzed and simulated in Matlab/Simulink and m-file code. Simulation model is developed with a maximum power at full sun equal to 315 W, which presents efficiency equal to 99.03%. The PID controller works as intended, as the output voltage can approach the expected value. Furthermore, performance and robustness are tested by load variations and set point variations.

Authors

Abdel-Karim Daud,SH Khader

Journal

WSEAS Transaction on Circuits and Systems

Published Date

2022

Distributed Solar PV System for Industrial Applications in Palestine

The paper presents the simulated and field tests of several distributed solar PV systems for industrial applications in Palestine. These systems generate solar power for self-consumption in lighting and air conditioning in a production line of a factory when solar energy is available. They do not feed the excess PV power to the grid. They will be switched to grid power supply when solar energy is not available. These systems started to operate after 2015, and implemented over rooftops in high potential regions in Palestine such as Jerusalem and Ramallah.PVsyst software with meteorological database Metronome 7 was used to make suitable forecast. Field results were compared with the simulated values of production. These results are verified each other and gave satisfied results with respect to >>>>>>>>>>>>>>>>.

Authors

Abdel-Karim Daud,Sameer Khader

Published Date

2021/4/14

Boost chopper behaviors in Solar photovoltaic system

This paper investigates the behaviors of Boost DC Chopper used in Photovoltaic energy systems where the solar irradiation changes during the day time causing current and voltage changes. Varying the solar irradiation causes output chopper voltage changes in order to keep working at maximum extracted solar power. The chopper voltage changes leading to variable duty cycle operation of chopper switch and causes a significant change in switch losses in terms of the dissipated power. In addition to that the chopper behaviors are studied when the chopper voltage is boosting up to a predetermined reference value leading to a significant change in chopper current, voltage, duty cycle and occurred losses. A mathematical model for chopper performances and switch losses is derived, and a simulation model using Matlab/ Simulink platforms is conducted to follow the chopper behaviors. Simulation results for concreteSUNPOWER panel type SPR-315E-WHT-D with 315 Watts peak indicates that during the daylight time transistors are exposed to complicated changes in their current, voltage and dissipated power. Furthermore changing the output voltage according to load requirements causes heavy stress on the transistor in terms of current, oscillations and losses as well. Simulation results show that there are optimized values of irradiation, chopper voltage and duty cycle where the transistor losses are minimized. In addition to that, projecting the transistor losses over the daylight time at a given irradiation rate shows how these losses vary among the year, and the amount of energy dissipated across the main chopper switch which is around 2970 …

Authors

Sameer Khader,Abdel-Karim Daud

Published Date

2021/3/31

A Comparative Analysis between Various Filters for Three Phase Current Source Inverter

This paper investigates three-phase Current Source Inverter (CSI) behaviors energized by battery storage sources replacing Photovoltaic solar system. This source provides energy to a three-phase balanced load throughout passive filters. Various types of filters’ configurations are utilized in order to reduce the current and voltage ripples at the inverter output and to reduce the loading stress over the battery bank. Three configurations of filters are investigated C, CLC, and LCL filters with respect to the drawn load current, battery current, and battery loading rate. A mathematical model for various filters is derived and simulation model using LabVIEW and Multisim platforms were conducted to follow the inverter behaviors when the filters’ parameters changed. A comparative analysis between these filters is conducted by changing the filters’ capacitance and inductance and following the inverter behaviors. The obtained simulation results stated that LCL filter with Wye connected capacitors presents better performances with respect to output voltage level, loading current, load to battery current utilization ratio at moderate capacitor values comparing with other filters but this advantage disappears at high values of used capacitors due to drawn large battery current.

Authors

Sameer Khader

Published Date

2020

Abdelkarim Daud FAQs

What is Abdelkarim Daud's h-index at Palestine Polytechnic University?

The h-index of Abdelkarim Daud has been 5 since 2020 and 7 in total.

What are Abdelkarim Daud's top articles?

The articles with the titles of

The Behaviours of Various DC Choppers during Shading Occurrence in PV Systems

A Novel Approach to Fast Determining the Maximum Power Point Based on Photovoltaic Panel’s Datasheet

Irradiation and Temperature effects on Modified SEPIC Converter Performance for PV Systems

Comparison Analysis between Various Boost Chopper Configurations

Closed Loop Modified SEPIC Converter for Photovoltaic System

Distributed Solar PV System for Industrial Applications in Palestine

Boost chopper behaviors in Solar photovoltaic system

A Comparative Analysis between Various Filters for Three Phase Current Source Inverter

are the top articles of Abdelkarim Daud at Palestine Polytechnic University.

What are Abdelkarim Daud's research interests?

The research interests of Abdelkarim Daud are: Electrical Machines, Electrical Drives, Renewable Energy

What is Abdelkarim Daud's total number of citations?

Abdelkarim Daud has 461 citations in total.

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