Abstract
The article is devoted to the research of induction motor drive (IMD) of a submersible pump for oil, gas and underwater processing equipment. The investigated electrotechnical system includes a cable line and LC-filters from the output of the voltage source inverter, which supplies an induction motor (IM). A simulation model was created, which makes it possible to research the static and dynamic modes of IMD in the whole range of mechanical load variation of the IM, as well as to estimate the harmonic spectrum of phase current and voltage. It is shown that the main contribution to the distortion of the motor phase current form is made by 7, 11 and 16 harmonics. The operation of the simulation model for scalar speed control of an induction motor is considered. It was established that in the open-loop control system of the IMD with proportional control mode, the angular speed of the IM can be regulated in the range from the nominal value to half of the nominal value with an error, that does not exceed 5%, without voltage correction. At the "fan" control mode, the error also does not exceed 5% in the whole range of mechanical load variation of the IM, but when the rotational speed decreases below 0.6ωnom, it is required to correct the voltage at the output of the IMD. However, when the rotational speed of the IM decreases below 0.6ωnom, it is required to correct of the supply voltage of the IM, which can be organized by readjustment of the VSI regulator parameters based on the induction motor rotational speed observer.
Keywords
Power supply system, induction motor drive, harmonic spectrum, simulation modeling, Matlab/Simulink.
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