Sistema de bombeamento fotovoltaico com motor de indução e sem baterias.

Abstract

This work deals with the use of photovoltaic energy applied to water pumping using triphases induction motor attached to a centrifuga pump with out need of electrochemistry batteries for save the generated energy by the photovoltaic system. On the pumping system studied there isn't excess of generated energy by the photovoltaic generators, because all the energy generated by them is deliver to the aggregation motor-pump, that will pumping more or less water volume, depending on the incidence of solar radiation. Because of photovoltaic generators have low eficiency on conversion of light energy in electric energy, is much interesting that this energy suffers the least possible loss in its processing, that goes from the generation to the final destination, that in this case is mechanical energy needed for the pumping. It is done an experimental study of the push-pull converter lift to determine the best relationship between the voltage input and out put to get a good input current control with maximum eficiency. It is also studied how to optimize the electric energy conversion to mechanical by the induction motor. The optimization strategies studied are: power fact control; search control; and equal current control. In this work is presented the study of six control and drive techniques of the induction machine, they are: Volts / Hertz control; classic indirect field oriented control (IFOC);modified IFOC,d-axis voltage;modified IFOC, q-axis voltage; direct stator flux slip control; and direct torque vector control (DTC).Some of those techniques have the advantage of no need velocity sensor.This study is done for determinate which of these techniques of control is better for implementation in pumping using photovoltaic energy.