FIELD: machine engineering; pumps.
SUBSTANCE: essence of the invention is to improve the accuracy of determining the pressure of a centrifugal pump with an asynchronous electric drive in the conditions of input signal noise, for which purpose the instantaneous values of currents and voltages of the asynchronous motor stator are measured and the three-phase values of currents and voltages are converted into two-phase components of currents and voltages. At each of the time intervals, a matrix of coefficients of the asynchronous motor status equations is compiled, the matrix of error covariances is determined, the matrix gain of the Kalman filter is determined, the vector of output values is determined, wherein the components of such vector are used to calculate the electromagnetic torque and the angular speed of rotation of the rotor reached by the asynchronous electric motor. Values of the electromagnetic torque and the angular velocity of the rotor are used to determine the instantaneous hydraulic power developed by the centrifugal pump. Values of the instantaneous hydraulic power and the angular speed of the asynchronous motor rotor rotation are used to determine the instantaneous volumetric flow rate of the centrifugal pump. The pressure developed by the pumping unit is determined based on values of the actual flow rate of the pumping unit and the pressure in the supply pipeline.
EFFECT: technical result of the invention is to increase the accuracy of determining the fluid pressure of a pumping unit with centrifugal pumps and asynchronous motors.
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