Optimal design of synchronous engine used in a system of photovoltaic pumping whith consideration the ageing

Abstract

The photovoltaic pumping systems are an interesting solution for water supply to isolated sites of power systems, such as rural areas in developing countries. Indeed, these sites generally have a favorable sunshine which allows to consider the use of the only source of energy (renewable) for pumping water. Unfortunately, such devices often suffer from failures that, for lack of maintenance render the device inoperable. In this context, this paper proposes optimal design multicriteria of the synchronous pumping system taking into account the aging of the motor. The objective is to dimension the engine as accurately about the service life of the panels.This optimal design requires as a first step the electrical, thermal and geometric modeling of the motor. For more accurate, live parts are taken into account in the geometrical and thermal modeling. Based on the thermal aging of the motor windings, we estimate the lifetime of the synchronous motor. These two models are the basis of multicriteria optimization which is then conducted with the NSGA II algorithm. A compromise between the mass and the heating is then proposed in order to control the cost of installation while choosing a more robust system. Finally we compare a solution using single motor over the entire life of panels with a solution using a replacement of motor to half life of the panels. The second solution could be an interesting solution economically, despite the investment related to renewal, because the reduction of the duration of the motor allows a significant reduction in the weight of the machine.