DIRECT TORQUE CONTROL OF A CENTRIFUGAL PUMP POWERED BY A PHOTOVOLTAIC SYSTEM WITH MPPT

Water pumping is a very important operation in the agricultural and industrial fields. Due to its arid nature, our Saharan environment has a significant solar energy resource that allows the installation of water pumping systems using photovoltaic solar pumps. For this type of system, and to improve its performance, a prior theoretical study is necessary. Given the intermittent and fluctuating nature of the solar resource, it is essential to set up a system that allows its optimal exploitation. The aim of this work is to describe, develop and simulate a direct control of the DTC torque of a solar pumping system with optimised efficiency. The system consists of a three-phase asynchronous motor, coupled to a centrifugal pump, powered by a photovoltaic generator. The operation of the photovoltaic generator will be ensured at its maximum power via the MPPT control of a BOOST converter. Two control strategies for the motor pump were implemented and compared.The first, based on a sinus-delta MPPT control of the three-phase inverter supplying the motor pump. The second,uses direct torque control DTC to control the operation of the induction motor driving the centrifugal pump. The DTC control technology will be further developed. A dynamic model of the motor driving the pump will be shown. The performance provided by the introduction of DTC control will be presented. In addition, a control system will be established in this work, which allows the set speed of the asynchronous machine and thus the pump output to be set according to the state of sunlight. The complete model of the established system will be implemented and simulated in the simulation environment of the MATLAB software.