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Keywords = stator supply sequence switching

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25 pages, 5681 KB  
Article
Field-Oriented Control of a Nine-Phase Cage Induction Generator with Large Speed Changes and Variable Load
by Dariusz Cholewa and Piotr Drozdowski
Energies 2024, 17(4), 790; https://doi.org/10.3390/en17040790 - 6 Feb 2024
Cited by 2 | Viewed by 1620
Abstract
This paper presents a voltage control system for multiphase squirrel-cage induction generators operating at a high variability of speed and variable load. Field-oriented vector control was used with a change in the sequence of the stator phase currents what changes the number of [...] Read more.
This paper presents a voltage control system for multiphase squirrel-cage induction generators operating at a high variability of speed and variable load. Field-oriented vector control was used with a change in the sequence of the stator phase currents what changes the number of poles of the magnetic field produced by nine-phase stator winding. At low speeds, the current sequence is changed so that the number of poles increases allowing for the desired voltage to be obtained with greater efficiency. The task of the automatic control system was to control the DC voltage to a desired value at the output of the multiphase PWM converter. This is an alternative control method to the scalar control of voltage and frequency presented in a previous work. The control method and parameters of the automatic control system result from the mathematical model of the multiphase induction machine. The results of the laboratory tests were compared with the effects of the operation of the same nine-phase scalar controlled generator. Full article
(This article belongs to the Special Issue Advances in Electrical Machines Design and Control)
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24 pages, 6068 KB  
Article
Voltage Control of Multiphase Cage Induction Generators at a Speed Varying over a Wide Range
by Piotr Drozdowski and Dariusz Cholewa
Energies 2021, 14(21), 7080; https://doi.org/10.3390/en14217080 - 29 Oct 2021
Cited by 5 | Viewed by 2643
Abstract
The subject of this publication is a method of controlling the DC voltage of a PWM rectifier supplied by a multiphase cage induction generator with the number of stator phases greater than three operating in a wide range of driving speeds. Voltage regulation [...] Read more.
The subject of this publication is a method of controlling the DC voltage of a PWM rectifier supplied by a multiphase cage induction generator with the number of stator phases greater than three operating in a wide range of driving speeds. Voltage regulation is performed by changing the frequency and amplitude of the stator voltages with simultaneous switching of the phase sequence of these voltages. The step change of the voltage sequence is made in the designated ranges of the generator speed, which enables the stabilization of the output voltage in a wide range from the minimum speed of about 25% of the rated speed. Such sequence switching changes the number of pole pairs produced by the winding for each supply sequence. The difference compared to multi-speed induction machines is that, in the presented solution, there is only one winding, not a few, which enables good use of the machine’s magnetic core in the same dimensions as for the three-phase machine of a similar power. Steady-state characteristics and dynamic operation were obtained using laboratory measurements of a standalone nine-phase induction generator. The automatic control system maintained the output voltage at the set level, regardless of the generator load and driving power. Full article
(This article belongs to the Special Issue Control, Operation and Protection of Multiphase Machines and Drives)
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