Parameter identification method and system of submersible electric pump permanent magnet motor based on oil production conditions

Abstract

The application discloses an oil extraction condition-based parameter identification method and system for a submersible electric pump permanent magnet motor, which comprises the following steps: obtaining the direct-axis current and the cross-axis current of the motor at the current moment, the displacement and the lift of the submersible electric pump and the motor parameters identified at the previous moment; determining the first power of the motor according to the displacement and the lift of the submersible electric pump; determining the motor speed and the second power of the motor at the current moment according to the direct-axis current and the cross-axis current of the motor at the current moment and the motor parameters identified at the previous moment; calculating the error value between the first power of the motor and the second power of the motor; correcting the motor power and the motor speed according to the error value to obtain the motor power at the current moment and the corrected motor speed; and determining the motor parameters identified at the current moment according to the motor power at the current moment, the corrected motor speed and the motor parameters identified at the previous moment. The application realizes accurate identification of the motor parameters.

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