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This article explores the applicability of a mathematical modeling approach, initially developed for a frequency-controlled electric drive of an ultra-high-pressure press hydraulic distributor, to the electric drives of walking excavators. The proposed model involves an induction motor (IM) powered by a direct frequency converter (DFC) built on an asymmetrical scheme with a minimal number of thyristor converters. The study focuses on evaluating the energy performance of such a configuration, especially considering the potential increase in power consumption due to distortion power caused by a reduced number of power blocks. The research begins with a dynamic analysis of the electric drive during the excavation cycle of the excavator bucket. Although the dynamic indicators were positive, they were insufficient for immediate implementation in earthmoving machinery without a comprehensive evaluation of all power consumption components—active, reactive, unbalanced, and distortion. To achieve this, phase currents of the induction motor and currents through DFC power elements were calculated and compared to those of a symmetrical system under identical conditions. The mathematical model uses a three-phase symmetrical coordinate system fixed to the stator, with rotor equations transformed into a rotating frame to maintain constant mutual inductances. This approach results in a system of linear differential equations that accurately describe electromagnetic processes and energy characteristics of the electric drive. A functional diagram of the drive with an asymmetrical DFC was developed, enabling refinement of current and voltage calculation algorithms and adjustments to the drive control system, including rotation direction control. The study includes harmonic analysis of phase currents, allowing for a detailed assessment of energy consumption. The article concludes with a formulation of the advantages and limitations of the asymmetrical configuration and offers practical recommendations for selecting appropriate control structures in electric drive systems.

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Study of Power Quality and Control Strategies for Excavator Drives Using Asymmetrical Direct Frequency Converters

  • 会议论文

  • 发表日期：

    2026年

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  • Ishembek Kadyrov,
  • Baktybek Turusbekov,
  • Nurzat Karaeva,
  • Baktybek Uulu Azamat

摘要

This article explores the applicability of a mathematical modeling approach, initially developed for a frequency-controlled electric drive of an ultra-high-pressure press hydraulic distributor, to the electric drives of walking excavators. The proposed model involves an induction motor (IM) powered by a direct frequency converter (DFC) built on an asymmetrical scheme with a minimal number of thyristor converters. The study focuses on evaluating the energy performance of such a configuration, especially considering the potential increase in power consumption due to distortion power caused by a reduced number of power blocks. The research begins with a dynamic analysis of the electric drive during the excavation cycle of the excavator bucket. Although the dynamic indicators were positive, they were insufficient for immediate implementation in earthmoving machinery without a comprehensive evaluation of all power consumption components—active, reactive, unbalanced, and distortion. To achieve this, phase currents of the induction motor and currents through DFC power elements were calculated and compared to those of a symmetrical system under identical conditions. The mathematical model uses a three-phase symmetrical coordinate system fixed to the stator, with rotor equations transformed into a rotating frame to maintain constant mutual inductances. This approach results in a system of linear differential equations that accurately describe electromagnetic processes and energy characteristics of the electric drive. A functional diagram of the drive with an asymmetrical DFC was developed, enabling refinement of current and voltage calculation algorithms and adjustments to the drive control system, including rotation direction control. The study includes harmonic analysis of phase currents, allowing for a detailed assessment of energy consumption. The article concludes with a formulation of the advantages and limitations of the asymmetrical configuration and offers practical recommendations for selecting appropriate control structures in electric drive systems.