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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Doglasse Ernesto Mendonça1, 3, Paulo César Marques de Carvalho1, Paulo Peixoto Praça1, José Sigefredo Pinheiro Neto1 and Douglas Bressan Riffel2
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DOI:10.17265/1934-8975/2017.03.007
Affiliation(s)
1. Department of Electrical Engineering, Federal University of Ceará – UFC, Fortaleza, 60455-760, Brazil
2. Department of Mechanical Engineering, Federal University of Sergipe – UFS, Sao Cristovão, Sergipe 49100-000, Brazil
3. Department of Engineering, Pedagogical University – UP, Km 1, Maputo, Mozambique
ABSTRACT
This paper presents a PV (photovoltaic) powered
RO (reverse osmosis) plant
for brackish water without batteries and a self-regulating pressure valve. The aim
is to extract the maximum power from the PV module using an MPPT (maximum power point
tracking) technique for powering a solar water pump and maintain constant the pressure
in the RO membranes by using the self-operated valve. A Buck type converter using
the InCond (incremental
conductance) MPPT was developed for this application. The MPPT chosen was simulated,
tested and validated, showing an efficiency of 86.8%. The technical feasibility
of the RO plant was made by PLC (programmable logic
controller) and was tested for two salinity levels (1,000 and 1,500 mg/L of TDS (total dissolved solids)). These salinity levels
chosen are commonly found in most brackish water wells of the semi-arid region of
Northeastern Brazil. The RO plant could permeate 175.3 L/day of drinking water with
120 mg/L of TDS and specific energy consumption of 2.56 kWh/m3.
KEYWORDS
Reverse osmosis, maximum power point tracker, solar energy.
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