International Journal of Industrial Electronics and Drives
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International Journal of Industrial Electronics and Drives (3 papers in press)
Water Pumping for Elevated Storage Using PV Doubly-Fed Induction Motor Drive by Osama Arafa, Mahmoud Salem, Ahmed Mansour, Yousry Atia Abstract: In remote locations with rich solar insolation, simple and effective Nano-gird schemes for day-hours feeding of the important pumping loads and auxiliary AC loads are highly desired. In this paper, a pump drive based on a PV doubly fed induction motor is introduced. The desired operational features of such Nano-grid such as unity power factor of the pump drive, stable supply of auxiliary ac load, and flexible distribution of power between pumping and ac auxiliary load as well as maximum power point tracking could be all realized using a partially rated rotor side PWM inverter along with an off-the-shelf full-rating standard inverter. The paper explains the design of the different necessary control loops such as the MPPT loop, the dc-link loops, and the rotor current loops. The dynamic performance of the system is tested under varying insolation and auxiliary ac load conditions Keywords: Doubly-Fed Induction Motor (DFIM); Variable Speed Centrifugal Pump Drives; Total Harmonic Distortion (THD); Unity Power Factor; Maximum Power Point Tracking (MPPT); Hill Climb Search (HCS); Fuzzy Logic Controller (FLC).
Modelling and Simulation of a Multi-Machine Power System incorporating Power system Stabilizers and Static Var Compensators for transient stability enhancement by Insha Muzaffer Mattu, Sabah Un Nisa, Mairaj Ud Din Mufti Abstract: This paper presents a model of a multi-machine system and examines the efficacy of power system stabilizers and static VAR compensator in transient stability enhancement. The main contribution of this work is a compact, user-friendly and comprehensive model to analyse and reinforce the system stability through a coordinated focus on damping of electromechanical oscillations and suppression of voltage deviations. The model is developed by integration of various mathematical equations pertaining to synchronous machines and some network equations . To test the effectiveness of the proposed model, MATLAB based simulations are carried out by subjecting the system to challenging transients. The performance evaluation of the model incorporating both power system stabilizers and static VAR compensator is tested against the individual performance of each. It is found that the model is effective in maintaining transient stability as well as improving transient stability limits. Keywords: MATLAB/Simulink; Power system stabilizer; Static VAR Compensator; Multi machine power system; Transient stability.
Optimization of the Dynamic Performance of the Photo-Voltaic and Wind-Turbine Hybrid-Energy System using the Particle-Swarm Optimization Technique by Mostafa S. Fathy, Hilmy Awad, Hosam Hegazy, E.E. Elkholy Abstract: In order to overcome the intermittent nature of renewable energy sources, two or more renewable sources are connected together forming hybrid systems. The main aim of this paper is to investigate and improve the dynamic performance of a hybrid photovoltaic and wind turbine (PV-WT) system under various operational conditions. The hybrid energy system consists of PV and doubly-fed induction generator wind turbine, which are connected together through a DC link. In order to improve the dynamic performance, a particle swarm optimization (PSO) algorithm is proposed for tuning the controllers of system converters. The obtained optimum gains are then implemented in a simulation model using the MATLAB/SIMULINK environment. The simulation results in the case of optimized gains are compared to the results with an initial-design results in the relevant literature. The results show that the dynamic performance of the system is improved in terms of speed and steady-state error. Keywords: Photovoltaic (PV); Maximum Power Point tracking (MPPT); Doubly-Fed Induction Generator (DFIG); PSO algorithm.