Combining floating PV with compressed air energy storage
Scientists from the Port Said University in Egypt and the University of Strathclyde in the United Kingdom have proposed to combine compressed air energy storage (CAES) with floating photovoltaics through a novel energy management strategy.
“To overcome the intermittency and availability issues of solar energy, the proposed floating PV system is equipped with an environmentally friendly hybrid compressed air energy storage system controlled by a novel energy management strategy to efficiently manage the power flow between the system's components without exceeding their allowable operational limits for safe operation,” the research's lead author, Erkan Oterkus, told pv magazine. “This control strategy is designed to ensure fulfilling the load requirements and utilizing even the low-grade PV power production, which reduces any power waste and improves the system efficiency.”
In the proposed concept, the energy management strategy follows the deterministic rule-based approach, which determines the rules with the aid of a fuel economy or emissions map of the system in question. “This approach utilizes the human expertise, intuition, heuristics, and mathematical models to generate a set of predetermined rules which control the operation of the system components,” the group stressed. “These rules are interpretable and can be tuned for better performance of different operational scenarios with low computational burdens.”
The 5 kW prototype utilizes partially floated PV panels that are in a continuous direct contact with the surrounding water, which provides an efficient and free cooling and improves the PV panels' efficiency as a result of the thermal equilibrium with the surrounding water. The floating platform used to support the PV system is capable of tracking the sunlight automatically for more solar energy production and altering the submergence ratio by adjusting the platform's draft and the PV panels' tilt angle to control their cooling or cleaning them from any accumulated dust or fully submerging the PV panels to avoid any damage during severe weather conditions.
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