Desenvolvimento de um Seguidor MPPT para um Sistema FV aplicado a planta de dessalinização por osmose reversa

Abstract

This paper presents the development of a photovoltaic power unit with maximum power point tracker (MPPT) technique applied to a brackish water desalinization plant via Reverse Osmosis (RO) using an auto Pressure Relief Valve in the concentrate. The aim is to extract the maximum power from the PV module using a MPPT technique for powering a solar water pump to pressurize water for RO membranes and auto regulate the pressure using a pressure relief valve. A step-down Buck type converter using the Incremental Conductance (InCond) MPPT technique was developed for this application. The MPPT was simulated, tested and validated, showed an efficiency of 86.8% in tracking maximum power. The technical feasibility of the RO plant, was tested for two salinity levels (1000 and 1500 mg/L TDS - Total Dissolved Solids). These two levels of salt concentration chosen are commonly found in most brackish water wells of semi-arid regions of northeastern Brazil and in other cases reaching up to 3000 mg of TDS. It was tested in 01/12/2015 with feed water about 1561 mg of TDS and it could permeate, 179.24 L/day with specific consumption of 2.52 kWh/m³ and day 02/12/2015 the feed water concentration was 1095 mg of TDS, the production was 171.37 L/day with specific consumption of 2.60 kWh/m.3