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Control Range and Power Efficiency of Multiphase Cage Induction Generators Operating Alone at a Varying Speed on a Direct Current Load

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  • Piotr Drozdowski

    (Faculty of Electrical and Computer Engineering, Cracow University of Technology, Warszawska 24 Str., 31-155 Cracow, Poland)

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 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.

Suggested Citation

  • Piotr Drozdowski, 2025. "Control Range and Power Efficiency of Multiphase Cage Induction Generators Operating Alone at a Varying Speed on a Direct Current Load," Energies, MDPI, vol. 18(15), pages 1-29, August.
  • Handle: RePEc:gam:jeners:v:18:y:2025:i:15:p:4108-:d:1716281
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    References listed on IDEAS

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    1. Omar Bouyahia & Amine Yazidi & Franck Betin, 2023. "Experimental Comparison of Robust Control Algorithms for Torque Ripple Reduction in Multiphase Induction Generators," Energies, MDPI, vol. 16(18), pages 1-18, September.
    2. Piotr Drozdowski & Dariusz Cholewa, 2021. "Voltage Control of Multiphase Cage Induction Generators at a Speed Varying over a Wide Range," Energies, MDPI, vol. 14(21), pages 1-24, October.
    3. Dariusz Cholewa & Piotr Drozdowski, 2024. "Field-Oriented Control of a Nine-Phase Cage Induction Generator with Large Speed Changes and Variable Load," Energies, MDPI, vol. 17(4), pages 1-25, February.
    4. Thales Ramos & Manoel F. Medeiros Júnior & Ricardo Pinheiro & Arthur Medeiros, 2019. "Slip Control of a Squirrel Cage Induction Generator Driven by an Electromagnetic Frequency Regulator to Achieve the Maximum Power Point Tracking," Energies, MDPI, vol. 12(11), pages 1-19, June.
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