Commande et analyse des performances d'une station de pompage photovoltaïque fonctionnant en régime optimal

The work presented in this paper studied performances of a pumping structure constituted by an asynchronous motor coupled to a centrifugal pump. The considered system is supplied by a photovoltaic generator (GPV) through two static converters piloted in an independent manner. Two strategies of command have been examined. The first one based on the measure of the photovoltaic current, ensures the working of the GPV with its maximal power via the control of a boost converter. The second, use the concept of the vectorial control by orientation of rotor flux to pilot the working of the asynchronous motor coupled the centrifugal pump. Otherwise, we established in this paper, an explicit relation permitting to determine the reference rotor speed of the asynchronous machine and therefore the debit of the pump according to the state of insulation. Finally, simulation results leads the proposed structure to the optimum operating condition and permits to localise the static limits of working in steady state and the dynamic regimes. Mots cles: Generateur photovoltaique - Convertisseurs statiques - Moteur asynchrone - Pompe centrifuge - Commande vectorielle - MPPT.