Power control for electrical applications over long cables

摘要

This disclosure is drawn to methods, systems, devices and/or apparatus related to power control in applications over long cables. Specifically, the disclosed methods, systems, devices and/or apparatus relate to power control that considers the maximum power available at the end of a long cable (or from a battery) to a load over a broad range of load conditions. Some example systems may include a power supply located at the Earth's surface and a power converter coupled to the power supply via a cable having a first end coupled to the power supply and a second end coupled to the power converter. Some example power converters may be configured to measure the power being consumed by the electrical load in the well, and adjust operating parameter(s) of the electrical load based, at least in part, on the maximum power available at the second end of the cable.

主权项

1. A system for powering an electrical motor disposed in a well, the system comprising:
a power supply; a motor drive circuit coupled to the power supply via a cable having a first end coupled to the power supply and a second end coupled to the motor drive circuit, the motor drive circuit configured to:
measure a power being consumed by the electrical motor; andadjust at least one operating parameter of the electrical motor based, at least in part, on a maximum power available at the second end of the cable, wherein the motor drive circuit is further configured to measure the power being consumed by the electric motor based, at least in part, on at least one of a velocity of the electric motor, a torque of the electric motor, an average motor voltage of the electric motor, or an average motor current of the electric motor, wherein the power supply includes a feed-forward loop that maintains a constant voltage at the second end of the cable, and wherein the motor drive circuit is configured to adjust a velocity of the electric motor to maintain a current at the second end of the cable at or below a maximum power transfer current.