A Practical Position Sensorless Control of Long-Cable-Fed PMSM Drives with a Sine-wave Filter for Electrical Submersible Pumps

This paper proposes a practical position sensorless control for electrical submersible pump (ESP) application with a sine-wave filter. In long-cable-fed PMSM drives, it is hard to install sensors at motor-side due to digital signal latency with the long signal cable and inconsistent source for sensors. Therefore, voltage and current correction method is proposed using the output of the sine-wave filter. Then, since the motor in the ESP system can be easily overheated by oil thermal field, an adaptive cable-PMSM coupled d-q axis equivalent model derived considering the temperature rise. The speed control performance and load torque-speed transient performance are improved using the proposed sensorless control method. The experimental results show the validity of the effectiveness of the proposed method both both dynamic response and steady-state.