Abstract
In recent years, part of the efforts of the electric drive researcher has been focused on the study of sensorless control algorithms that allow controlling the machine without a speed measure and with ever-fewer measurement devices. This article proposes a possible solution for the submarine application of an asynchronous motor. The motor is designed to drive a petrol pump at a depth of three thousand meters. The motor is fed by an inverter that is located on an offshore platform, and they are connected through a filter and a cable that is 19.74 km long. In this application, it is not suitable to use a speed measurement device; in fact, at this depth it is important to use as few components as possible, in order to increase the system reliability. A control algorithm that only needs available electrical measures is proposed below.
Highlights
Induction Motor Field-OrientedIn recent decades, induction motor drives have established themselves in various applications where high reliability is required
The inverter and the filter are located on the oil platform while the motor and the pump are on the subsea oil exploitation, and they are connected through a 19.74 km cable
The angle is used for the orientation of below the speed measurement available; so,flux a speed estimation a all the electrical variables, and the moduleisisnot compared to the rotor reference, which is the first reference of the DFOC
Summary
Induction motor drives have established themselves in various applications where high reliability is required. The inverter and the filter are located on the oil platform while the motor and the pump are on the subsea oil exploitation, and they are connected through a 19.74 km cable This system, analogous to what has been argued in [4], presents a series of challenges for the control system; first of all, the difficulty in carrying out measurements such as motor speed, stator current, and stator voltage. These control methods offer high precision and good dynamics; in particular, the FOC algorithm allows controlling separately the flux and the speed These control strategies require accurate electrical and mechanical measurements. The advantages of the proposed algorithm are use of a Luenberger Observer for the induction machine, introduced in several First of all, it does not require any speed sensor, since the use of a speed sensor is not a convenient better robustness to theinparametric variations.
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