Squirrel cage induction generator load control
DOI:
https://doi.org/10.31548/energiya2020.02.086Abstract
Abstract. The use of asynchronous generators as load devices for testing and running-in of power drives of new and refurbished equipment is the most efficient. Frequency converters with a direct current link are most often assumed to control the load. There are other methods of controlled loading of an asynchronous generator using a capacitor bank as a source of reactive power.
Thyristor voltage regulators could become an alternative to the frequency converter with a link of a direct current.
The purpose of the study is to study the possibility of increasing the reliability and efficiency of drive load systems and (or) generating systems when working on the network using asynchronous generators through the use of a three-phase choke in parallel with a thyristor voltage control module.
A new way of the load control of an induction generator is being explored. The results of testing the physical model of the load stand of the asynchronous generator during its operation together with the thyristor voltage regulator and three-phase coil are given. The results of the study of the forms and magnitude of the stator current of an asynchronous generator at different modes and levels of its load are presented in the paper. A comparative analysis of the magnitude and phase of the sine wave offset with respect to the phase voltage of the network. The results show the increase of the active component of the stator current as the conduction angle of the thyristor modules of the voltage converter increases.
The studies confirm the presence of recovery of part of the energy consumed from the network by the drive motor, when the opening angle of the thyristors exceeds about 1 rad.
The oscillogram can be concluded that there is a significant distortion of the sinusoidal shape of the current, which can have a significant impact on the processes in the electric machine.
Key words: induction generator, three-phase coil, voltage regulator, load controlReferences
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