Current Issue : July - September Volume : 2020 Issue Number : 3 Articles : 5 Articles
The modeling and control of a wind energy conversion system based on the Doubly Fed Induction Generator DFIG is the discussed\ntheme in this paper. The purpose of this system was to control active and reactive power converted; this control is ensured thanks\nto the control of the two converters. The proposed control strategies are controlled by PI regulators and the sliding mode technique.\nIn the present work a comparison of the robustness of the 2 controls of the grid side converter (GSC) during a voltage dip is shown.\nThe simulation is carried out using the Matlab/Simulink software with a 300 kW generator....
Integrated-starter-generator (ISG) motors are a key part of new-energy vehicle dynamic systems. To more efficiently design\nhigher-performance permanent magnet ISG motors, we proposed a multiphysical-domain integrated design method by designing\nthe electromagnetism and thermal performance of motors and the mechanical structure strength of rotors together. A 48-slot and\n8-pole oil-cooled permanent magnet ISG motor was designed by using this method and simulated via the finite element method.\nAlso, a motor-testing platform was built to experimentally validate this method. The simulation results were consistent with the\ntest results, which confirmed that the new method was accurate and effective and can be referred to during the practical design and\ndevelopment of high-density permanent magnet motors....
Independent microgrids are widely used in islands and remote townships. However, power imbalance often leads to fluctuations\nin voltage and frequency, which inhibit the development of AC microgrids. To overcome such problems, this paper proposes an\noptimized full-bridge converter energy storage structure to realize power balance and optimization of the microgrid.Theproposed\nstructure has the characteristics of simple design, easy modularization, and flexible power regulation. First, the working structure\nand mathematical model are analyzed, and the power model is then established. From the viewpoint of capacitor charging and\ndischarging and inverter, the active and reactive power control technology of the full-bridge structure is analyzed, and a\nmultimode power coordinated control strategy is adopted to adjust and optimize the target power. Finally, the feasibility of the\nstructure and control strategy is verified through a simulation and an experiment. In summary, this study is of great significance to\nthe future promotion and application of AC microgrids....
The stabilization of cross-linked polyethylene (XLPE) cables is crucial to the safe working of power systems. In order to investigate\nthe aging characteristics of cable insulation in the process of operation,.........................
Transient analysis of 33 KV power transmission line stability of Egi community\nis considered in this research work with the aim of reducing the frequency\nof fault occurrence and voltage collapse in the network. The supply is\ntaken from Egi generating station located at Total Nigeria Limited Gas Plant\nObite at voltage level of 33 KV to Egi communities. This work focuses on the\ntransient nature of network stability since transient fault is the most dangerous\nin electrical systems. The swinging of the generator rotor in the event of\ntransient three-phase short circuit fault can be monitored by the circuit\nbreakers and the protective relays which causes mal-functioning of the circuit\nbreakers and protective relays leading to abnormal behavior of the network.\nTherefore, data obtained from the power station were used as a case study of\nIndependent Power Producer (IPP) in Nigeria. For investigation of the power\nangle, angular velocity, rotor angle differential changes, and angular velocity\ndifferential changes, an electrical transient analyzer tool was employed (ETap\nversion 16.00) for circuit breaker and protective relay time setting of (0.00,\n0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60). The work\nused the Trapezoidal numerical technique for data analysis. The graphs were\nplotted using Matlab R2015a and the results obtained showed that when a\nsymmetrical three-phase short circuit fault occur at one or any of the feeders,\nthe fault must be cleared as quick as possible through the coordination of the\ncircuit breakers and protective relays....................................
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