FLUID EXTRACTION SYSTEM, CONTROL SUBSYSTEM, ELECTRIC MACHINES WORKING SPEEDS CONTROL METHOD AND ELECTRIC MACHINE CONTROL METHOD Russian patent published in 2020 - IPC H02P6/00 H02P6/12 H02P6/14 H02P6/18 E21B4/04 E21B43/17 

FIELD: electrical engineering.

SUBSTANCE: invention can be used in a system for extraction of well fluids, for example oil and/or gas, from a well. Disclosed is a control subsystem for controlling an electrical machine. Control subsystem comprises phase shift control unit to receive electric signal indicating rotor angular position. Phase shift control unit generates a phase-shifted electric signal by applying a phase shift to an electrical signal. Value of phase shift is determined based on the speed control signal. Phase shift control unit is configured to generate a phase command signal based on the phase-shifted electrical signal. Control subsystem also includes switching unit to control supply of phase current to one or more phase windings of electric machine on the basis of phase command signal so that rotor operates at preset rotation speed. Also disclosed are fluid extraction system and electric machine control method.

EFFECT: high reliability of equipment in heavy operating conditions inside a well and control of operating speed of electric submersible pumps (ESP) regardless of operation of other ESP located in the well.

36 cl, 13 dwg