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Keywords = steady state characteristics of multiphase induction generators

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29 pages, 3882 KB  
Article
Control Range and Power Efficiency of Multiphase Cage Induction Generators Operating Alone at a Varying Speed on a Direct Current Load
by Piotr Drozdowski
Energies 2025, 18(15), 4108; https://doi.org/10.3390/en18154108 - 2 Aug 2025
Viewed by 858
Abstract
The aim of the article is to determine the control range of a multiphase squirrel cage induction generator with more than three stator phases, operating in a wide range of driving speeds. The generator produces an output DC voltage using a multiphase converter [...] Read more.
The aim of the article is to determine the control range of a multiphase squirrel cage induction generator with more than three stator phases, operating in a wide range of driving speeds. The generator produces an output DC voltage using a multiphase converter operating as a PWM rectifier. The entire speed range is divided into intervals in which the sequence of stator phase voltages and, in effect, the number of pole pairs, is changed. In each interval, the output voltage is regulated by the frequency and amplitude of the stator voltages causing the highest possible power efficiency of the generator. The system can be scalar controlled or regulated using field orientation. Generator characteristics are calculated based on the set of steady-state equations derived from differential equations describing the multiphase induction machine. The calculation results are compared with simulations and with the steady-state measurement of the vector-controlled nine-phase generator. Recognizing the reliability of the obtained results, calculations are performed for a twelve-phase generator, obtaining satisfactory efficiency from 70% to 85% in the generator speed range from 0.2 to 1.0 of the assumed reference speed of 314 rad/s. The generator producing DC voltage can charge an electrical energy storage system or can be used directly to provide electrical power. This solution is not patented. Full article
(This article belongs to the Special Issue Advanced Technologies for Electrified Transportation and Robotics)
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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 2807
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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