Sistema Fotovoltaico de Bombeamento Baseado em Conversores de Frequência e Bombas Centrífugas Comerciais Utilizando Controle Fuzzy Externo com Tensão Fixa

Abstract

This work proposes the development and implementation of a fuzzy logic-based controller capable of maintaining stable the voltage level at the DC bus of a commercial variable-speed drive (VSD) used to couple photovoltaic generators to commercial centrifugal motor pumps for water pumping purposes. The system operates in closed loop, and the DC bus voltage regulation is made indirectly through the variation of the motor pump speed according to the power available from the photovoltaic generator. The goal is to maximize efficiency and prevent system disarming by under-voltage errors in the intermediate circuit of the VSD. The control algorithm was embedded in a PIC microcontroller and experimentally evaluated, showing expected behavior even under drastic changes in power availability.