IEEE Access (Jan 2022)

Sequential Error Disentanglement of Three-Phase Current Sensor for AC Machine in Standstill Conditions

  • Darian Verdy Retianza,
  • Juris Arrozy,
  • Jeroen Van Duivenbode,
  • Henk Huisman,
  • Bas Vermulst

DOI
https://doi.org/10.1109/ACCESS.2022.3218311
Journal volume & issue
Vol. 10
pp. 113902 – 113914

Abstract

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This article proposes a compensation method for gain and offset errors in the current sensing of three-phase AC machine drives with three current sensor measurements during exact or close to standstill conditions. Errors are treated sequentially based on the elliptical trajectory method, a mathematical manipulation by demodulating faulted time-varying $d,q$ currents using the machine position. As three current sensors are used, a correction factor through measured neutral current is proposed such that the impact of machine resistance deviation and inverter non-idealities are minimized. The method does not incorporate any additional hardware, making it low-cost and straightforward in its implementation. It is proposed as a tool for initial commissioning before the machine runs. It is robust to rotor position perturbations and does not need a mechanical lock for compensation in standstill conditions. The effectiveness of the suggested approach is shown by analysis, modelling, and experimental findings acquired from a hardware prototype by mimicking the actual use of high-precision mechatronics.

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