METHOD OF PRESSURE STABILIZATION OF A PUMP UNIT WITH ASYNCHRONOUS ELECTRIC DRIVE Russian patent published in 2020 - IPC F04D15/00 F04D13/06 H02P21/00 

FIELD: pump building; electrical engineering.

SUBSTANCE: invention relates to pump engineering and electrical engineering. Pressure stabilization method of pump unit (PU) with asynchronous electric drive includes measurement of instantaneous values of stator currents of asynchronous motor (AM) and rotation speed of rotor. At the same time the required PU pressure is set, three-phase current values are converted to two-phase current components, and the latter into components of stator currents in the rotating coordinate system, the rotation angle of the rotating coordinate system is determined, and estimated values of components of rotor flux linkages are calculated. Estimated values of components of stator current and flux linkage of rotor are used to calculate: electromagnetic moment AM, moment of centrifugal pump load, hydraulic power of pump, pump forced pressure, actual flow rate PU. Values of actual flow rate PU and pressure at supply pipeline determine: the pressure developed by the PU, the stator current specified in the longitudinal axis of the AM magnetic field, the components of the stator driving voltage in the rotating coordinate system, the stator driving voltage in the fixed coordinate system, which are the driving signals for the voltage inverter. Obtained voltage of the inverter is supplied to AM, which creates the required electromagnetic moment for injection of the required PU pressure.

EFFECT: invention is aimed at reduction of mass and dimensions parameters of electric drive PU.

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