Hybridization of storage technologies is effective for PV plant grid integration. The supercapacitor minimizes battery degradation for PV output ramp limitation. This paper presents a 2-level controller managing a hybrid energy storage solution (HESS) for the grid integration of photovoltaic (PV) plants in distribution grids.
This paper presents a 2-level controller managing a hybrid energy storage solution (HESS) for the grid integration of photovoltaic (PV) plants in distribution grids. The HESS is based on the interconnection of a lead-acid battery pack and a supercapacitor pack through a modular power electronics cabinet.
The synergistic operation of the two storage technologies embedded into the hybrid solution, permits to reduce the total battery output (15% of total energy provided by the hybrid solution is through the supercapacitor pack), thus extending its lifespan. Fig. 10. Experimental results.
Lab-scale prototype for the hybrid energy storage solution. Label 1 indicates the grid inverter. Label 2 corresponds to the common dc-link at which dc-dc converters 3 and 4 are connected to. While the rated energy of the supercapacitor pack in Section 3 was set to 0.25 MWh, for the lab-scale prototype it is 0.25 kWh.
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