Papers by Naser Abdel-Rahim
Journal of Electrical Systems and Information Technology, 2016
In this paper, the selective harmonics elimination (SHE) technique is used to eliminate low-order... more In this paper, the selective harmonics elimination (SHE) technique is used to eliminate low-order harmonics with relatively low inverter switching frequency. The major challenge which faces this technique is solving large numbers of nonlinear transcendental equations at each modulation index to generate the power inverter switching patterns. Genetic algorithm (GA) technique is used to obtain the optimal switching angles. Simulation and experimental results are obtained to be guarantee that GA is eliminated the desired harmonics.
This paper deals with the application of the selective harmonic elimination technique of a closed... more This paper deals with the application of the selective harmonic elimination technique of a closed-loop control scheme of single-phase PWM inverter employing proportional resonant controller. Selective harmonics elimination (SHE) technique is used to eliminate low order harmonics with relatively low inverter switching frequency. The major challenge which faces this technique is solving large numbers of nonlinear transcendental equations at each modulation index to generate the power inverter switching patterns. Proportional resonant controller is employed to reduce both magnitude and phase errors of the load voltage.
2015 IEEE International Conference on Smart Energy Grid Engineering (SEGE), 2015
This paper deals with the application of the selective harmonic elimination technique of a closed... more This paper deals with the application of the selective harmonic elimination technique of a closed-loop control scheme of single-phase PWM inverter employing proportional resonant controller. Selective harmonics elimination (SHE) technique is used to eliminate low order harmonics with relatively low inverter switching frequency. The major challenge which faces this technique is solving large numbers of nonlinear transcendental equations at each modulation index to generate the power inverter switching patterns. Proportional resonant controller is employed to reduce both magnitude and phase errors of the load voltage. Simulation of the proposed system is reported. The simulation results show that this system is capable of producing load voltage with low total harmonic distortion (THD).
IET Conference on Renewable Power Generation (RPG 2011), 2011
ABSTRACT The conceptual possibility of using battery storage in order to reduce the wind power fl... more ABSTRACT The conceptual possibility of using battery storage in order to reduce the wind power fluctuations caused by a grid connected wind energy converter systems (WECS) represent an important issue for the continuous increase in renewable energy penetration. However, degradation of the battery during the operation and thus elevated costs constitute major issues if such system configurations were to be investigated. In this paper, wind energy is levelled to forecasted values with the means of a lead-acid battery as well as sale/purchase transactions with the electricity market. This work offers a novel approach by considering the ageing of the utilized battery and by developing and analysing a number of Battery Management Strategies in order to optimize the technical and economic performance of the whole system. The real cost benefit and added generation cost analysis based on actual market electricity prices are used to evaluate the suggested BMS's. The carried out investigation shows that intelligent strategies can enhance the system's technical and economic performance by smoothing the wind power fluctuations, prolonging the battery's lifetime and reducing the generation added cost due to storage integration. (6 pages)
D. Kachmarik T. Kato V. Kaura A. Kawamura M. Kazimierczuk A. Kelley B. Kenney R. Kerkman R. Kerma... more D. Kachmarik T. Kato V. Kaura A. Kawamura M. Kazimierczuk A. Kelley B. Kenney R. Kerkman R. Kerman A. Keyhani A. Khambadkone S. Khanniche Y. Kim R. King G. Kliman T. Koga T. Kohama J. Kokernak J. Kolar R. Kraus R. Krishnan P. Kumar T. Kume Y. Kuroe F. ...
Stand-alone systems using renewable energy sources, such as wind energy and photovoltaic (PV) ene... more Stand-alone systems using renewable energy sources, such as wind energy and photovoltaic (PV) energy with storage battery banks are commonly used to supply remote houses. Stand-alone hybrid wind-PV system with battery storage is considered in this paper. It is proposed to employ squirrel-cage induction generator (SCIG) in wind subsystem. Pulse-width modulation (PWM) rectifier is used to control the SCIG. The proposed control scheme employs the direct torque control (DTC) strategy to modulate the ON / OFF durations of the switching devices of the PWM rectifier to ensure maximum power extraction through the SCIG operation. Furthermore, the control scheme rids the proposed system from the need of dedicated external capacitors for exciting the SCIG. Instead, the required reactive power of the SCIG is provided by the switching of the PWM rectifier. Simulation results are provided in the paper to demonstrate the capabilities of the system.
In this paper, the equations describing the performance of the electric vehicle are derived. Perf... more In this paper, the equations describing the performance of the electric vehicle are derived. Performance characteristics for each part in the vehicle system are obtained when the vehicle is accelerated under a variable terminal voltage while the turn on, turn off angles are constants.
Stand-alone photovoltaic systems supplying remote houses have storage battery banks. The battery ... more Stand-alone photovoltaic systems supplying remote houses have storage battery banks. The battery banks improve the reliability of these residential systems. There is a maximumvoltage limit of the battery bank to protect it against overcharging. Maintaining the battery-bank voltage at its maximum limit is accompanied with reduction of captured energy from the renewable energy source. In this paper, standalone residential PV system is studied. Control technique for a motor driving water pump is developed such that the problem of reduction of captured power is reduced. Experimental setup is constructed in the laboratory to verify the performance of the system.
IET Conference on Renewable Power Generation (RPG 2011), 2011
ABSTRACT Conventional PI controllers are usually used in single-phase grid-connected dc/ac invert... more ABSTRACT Conventional PI controllers are usually used in single-phase grid-connected dc/ac inverters for photovoltaic plants. These PI controllers suffer from two major drawbacks; steady-state errors in case of sinusoidal reference signals besides their limited disturbance rejection capability. To overcome these shortcomings proportional-resonant (PR) and fuzzy-logic controllers are investigated and then compared with the conventional PI controller. The ability of the PR controller through introducing an infinite gain at a resonance frequency is analysed. The design of the PR-controller is investigated and steps for tuning the controller are given in this work. Moreover, a fuzzy-logic PI-(FPI-) controller is also designed and its performance is evaluated with respect to the PI- and PR-controllers. A simulation-based analysis is used to investigate the novel comparison between the PR- and FPI-controllers where the controllers' performance is evaluated and compared regarding: transient and steady-state characteristics as well as total harmonic distortion (THD). The analysis showed excellent behaviour of the investigated controllers to overcome the PI-controller related shortcomings. The FPI-controller showed better transient and disturbance rejection capabilities, while the PR-controller exhibited excellent steady-state characteristics.
In this paper, the equations describing the performance of the electric vehicle are derived. Perf... more In this paper, the equations describing the performance of the electric vehicle are derived. Performance characteristics for each part in the vehicle system are obtained when the vehicle is accelerated under voltage, turn on, and turn off angle control. A comparison between the different methods of control is established. From these comparisons, it can be noticed that the acceleration time, for the case at which the turn on angle is controlled, will be smaller than that for the other cases; also the motor efficiency, at the voltage control method, has the highest value especially at the higher values of the vehicle speed.
IET Electric Power Applications, 2012
ABSTRACT Comprehensive analysis of the starting period of inverter-fed large induction motors rev... more ABSTRACT Comprehensive analysis of the starting period of inverter-fed large induction motors reveals that these motors are subjected to additional components of pulsating torsional torque. These torque pulsations may coincide with the natural torsional frequency of the large motor system and produce hazardous shaft torque oscillations. To alleviate the torsional toque problem and limit the motor starting current, a constant air-gap flux using slip frequency control scheme is proposed to operate the motor inverter. Simulation results show that the proposed scheme is capable of drastically reducing the torsional torque oscillations and limiting the motor line current to approximately 22% of its direct online starting value without prolonging its starting period.
IEEE Transactions on Energy Conversion, 2000
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Papers by Naser Abdel-Rahim