A team of international researchers led by Algeria’s University of Biskra has unveiled a cutting-edge solar-powered desalination system designed to treat brackish water. The system integrates photovoltaic panels and battery storage with advanced control algorithms to ensure high efficiency and consistent water output, even under fluctuating sunlight conditions.
Unlike traditional two-stage PV–reverse osmosis (RO) setups, this innovative design uses a Quasi-Z-Source Inverter (QZSI) to handle both DC–DC boosting and DC–AC conversion in a single stage. This reduces energy losses, lowers component requirements, and cuts overall system costs.
To optimize energy harvesting, the system employs a hybrid spotted hyena optimizer (SHO) combined with a perturb and observe (P&O) maximum power point tracking (MPPT) algorithm. This hybrid approach enables rapid and accurate tracking of the global maximum power point (GMPP), even during partial shading or variable irradiance.
The desalination unit is powered by a four-panel PV array (175 W each) and a 110 Ah, 300 V lithium-ion battery. A 750 W three-phase induction motor drives the RO unit, which uses a polyamide thin-film composite membrane. A Linear Quadratic Regulator (LQR) controller ensures system stability, minimizing transient errors and reducing settling time.
Experimental validation through hardware-in-the-loop (HIL) testing confirmed the system’s performance under real solar conditions in Biskra. It achieved:
- 99.9% MPPT tracking efficiency
- 0.08-second response time
- Stable permeate flow of 0.2 m³/h
- Product water salinity of ~5.2 g/m³
The research was a collaborative effort involving institutions from Algeria, India, Jordan, Saudi Arabia, and Ukraine. The full study is published in Scientific Reports under the title “A smart single stage solar battery driven desalination system with hybrid MPPT and optimal control for brackish water treatment.”
(Source: PV Magazine)