Browsing by Author "Deriszadeh, Adel"

Now showing 1 - 2 of 2

Citation - WoS: 2
Citation - Scopus: 3
A dynamic functional model of diode bridge rectifier for unbalanced input voltage conditions
(John Wiley and Sons Inc, 2021) Adel Deriszadeh; Orkun Karabasoglu; Martin P. Ćalasan; Farnaz Mehdipour; Deriszadeh, Adel; Karabasoglu, Orkun; Calasan, Martin P.; Mehdipour, Farnaz
Diode bridge rectifiers are employed in many industrial applications wherein under practical operating conditions input voltages can be occasionally or inherently unbalanced. Using the switching function method this paper proposes a new accurate functional model of the diode bridge rectifier capable of dealing with unbalanced input voltage conditions. To take all degrees of unbalanced conditions into account this paper introduces uneven commutation intervals phenomenon between diodes occurring under unbalanced voltage conditions and proposes dynamically updating switching functions. © 2021 Elsevier B.V. All rights reserved.
Citation - WoS: 10
Citation - Scopus: 13
Excitation procedure for brushless woundrotor synchronous starter generator with seamless transitions
(Institution of Engineering and Technology JBristow@theiet.org, 2019) Adel Deriszadeh; Orkun Karabasoglu; Salih Baris Ozturk; Deriszadeh, Adel; Ozturk, Salih Baris; Karabasoglu, Orkun
An analytical model of excitation system of brushless wound-rotor synchronous starter generator for aircraft applications is developed and presented in this study. During engine start-up process the starter generator operates as a motor to start the aircraft turbine and to assist it up to the self-sustaining speed. On the basis of rotation speed of the starter generator in the engine start-up process there are three excitation modes for the exciter and two transient modes for the field current of the main generator (MG). In this study for each excitation mode the relationship between the excitation current (field current of the exciter) and the field current of MG is investigated by taking into account the influence of power electronic parts. This study also proposes a control method for the generator field current in all excitation modes which can detect optimum operating points for transition between excitation modes. Furthermore a seamless transient control strategy is proposed for the transient modes of the generator field current. Simulation and experimental results are provided to demonstrate the feasibility of the proposed solution. © 2019 Elsevier B.V. All rights reserved.