№1(9) 2018

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https://eir.nuos.edu.ua/handle/123456789/3328

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Перегляд №1(9) 2018 за Ключові слова "direct and transverse axis excitation"

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    Implementation of the compensated operation mode of a synchronous generator with direct and transverse axis excitation
    (2018) Podymaka, V. I.; Novogretskyi, S. N.; Подимака, В. І.; Новогрецький, С. М.
    The article considers the possibility of putting a synchronous generator into a compensated mode by controlling excitation in the transverse axis. In this mode, the transverse armature reaction is completely compensated by the magnetizing force of the transverse excitation winding, the rotor torque angle is maintained at zero level, and the transverse component of the load current vector is its active component. It is shown that introduction of a positive feedback in the transverse excitation axis on the active component of the load current is sufficient in order to provide for this mode. At the same time, only proportional control of the generator’s armature voltage needs to be implemented for the direct excitation axis. Abandoning feedback on the reactive component of the armature current enables a more efficient damping of electromechanical oscillations in the system. As revealed by the study of the equation of dynamic equilibrium of the generator, oscillations of the rotor torque angle are damped at the use of the specified control method and at a loading angle below the critical value. The ratio of the magnetizing excitation forces and the transverse axis armature reaction has been analyzed, which allowed obtaining an analytical dependence of the feedback coefficient for the active component of the load current on the inductive resistance of the armature phase and geometric data of the generator.