Toshiba International Corporation

Goutham Selvaraj

Yu Liu

Yao Duan

Mark Douglas Rayner

Mark Rayner

A method for controlling a permanent magnet (PM) synchronous motor in an ESP application is provided. A load angle of the PM motor is estimated. A voltage adjustment value is determined for the PM motor based at least on the estimated load angle of the PM motor. A voltage to be applied to the PM motor is determined based on the voltage adjustment value.

Voltage optimization technique for a permanent magnet motor used in an electric submersible pump

Disclosed embodiments are directed to a technique to remove DC offset from current measurement signals through shunt resistors in digital signal processing for current reconstruction when using discontinuous pulse width modulation (DPWM). Such measurements regarding current are pertinent to a feedback loop used for a system including a DC-link capacitor, inverter, and motor. A method of removing DC offset comprises: determining a three-phase output current signal of an inverter, wherein the inverter is coupled to a motor and a power supply; producing a voltage signal based on the three-phase output current signal and the resistances of one or more shunt resistors disposed in the inverter; applying an analog gain circuit to the voltage signal; processing the voltage signal with an analog-to-digital converter (ADC); applying a DC offset corrector to the voltage signal; and performing current reconstruction on the voltage signal to produce a continuous current signal.

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Houston, TX, United States of America

Goutham Selvaraj