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Stable power supply for Rotary Steerable Systems (RSS) is essential for downhole closed-loop control, but traditional contact-based power transmission faces mechanical wear and reliability issues. Wireless Power Transfer (WPT) technology offers a solution, but drilling vibrations, axial misalignment, and load fluctuations reduce transmission efficiency in conventional compensation topologies (e.g., SS, SP). This paper proposes an LCC-S compensated WPT system to improve energy transmission stability under varying coupling coefficients. The LCC-S compensation topology is analyzed, and the inductance ratio between the series compensation inductor and the coil self-inductance is determined. Using MATLAB scripts and a Simulink platform, the optimal efficiency point is identified based on the inductance ratio and system efficiency. Results show that with optimized inductance parameters, the system achieves 85.85% efficiency, delivering 327.7W at a constant 57V output, fully meeting RSS WPT power supply requirements. This study provides theoretical support and technical references for WPT application in rotary steerable systems.

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Energy Efficiency for Wireless Power Transfer in Rotary Steering Systems with LCC-S Compensation

  • 会议论文

  • 发表日期：

    2026年

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  • Yuanyuan Liu,
  • Jun Qiu,
  • Huaping Wang,
  • Zhidan Yan,
  • Zhensheng Lv,
  • Shiying Liu,
  • Wenhao Liu

摘要

Stable power supply for Rotary Steerable Systems (RSS) is essential for downhole closed-loop control, but traditional contact-based power transmission faces mechanical wear and reliability issues. Wireless Power Transfer (WPT) technology offers a solution, but drilling vibrations, axial misalignment, and load fluctuations reduce transmission efficiency in conventional compensation topologies (e.g., SS, SP). This paper proposes an LCC-S compensated WPT system to improve energy transmission stability under varying coupling coefficients. The LCC-S compensation topology is analyzed, and the inductance ratio between the series compensation inductor and the coil self-inductance is determined. Using MATLAB scripts and a Simulink platform, the optimal efficiency point is identified based on the inductance ratio and system efficiency. Results show that with optimized inductance parameters, the system achieves 85.85% efficiency, delivering 327.7W at a constant 57V output, fully meeting RSS WPT power supply requirements. This study provides theoretical support and technical references for WPT application in rotary steerable systems.