Hybrid storage design at two level increases the efficiency of solar energy and reduces costs
In an era in which renewable energy reforms electricity networks, the photovoltaic capacity of solar energy (PV) is still standing for a core challenge: the sun rarely provides energy exactly when the demand peaks. Researchers from the University of Aalborg have introduced a design on two levels for hybrid energy storage systems (Hess) that can make solar energy more reliable and more economical.
The system integrates lithium ion batteries with super capacitors, which tackles the intermittency problem and at the same time reduces the relegation of the battery. Tests for more than a year, the approach reduced the battery cycling by a maximum of 13 percent, extended battery lifespan and stored the self -supply of the system without increasing operating costs.
The design also stabilized schedules by controlling the electricity slabs and optimizing the energy flow between PV arrays and the grid. “By combining lithium-ion batteries with super capacitors in an intelligent way, we use the strengths of each technology,” the researchers said. “Supercondensators process the rapid flow fluctuations that break down typical batteries, while the batteries manage storage needs in the longer term.”
An adaptive filter divides the power dynamically between the two storage types in real time, so that each works in ideal limits. This not only extends the lifespan of the components, but also lowers replacement costs.
Next steps will contain more detailed models for aging batteries and real-world cell tests, in addition to refined economic assessments. The team sees the design on two levels as a step in the direction of more practical, cost-effective storage of solar energy that can speed up the transition to clean energy.
Research report:Duble level design for cost-effective size and energy management of hybrid energy storage in photovoltaic systems
