Researchers in Denmark have developed a new size strategy to combine PV system processing with lithium ion batteries and super capacitors. The proposed approach would reduce the annual battery cycle by 13%.
A group of scientists at Aalborg University in Denmark has devised a new measuring approach for combining PV current generation with hybrid energy storage of lithium ion batteries and super capacitors in an attempt to improve storage activities and reduce operational costs.
“By combining lithium-ion batteries with super capacitors in an intelligent way, we use the strengths of each technology,” said the research team. “Supercondensators process the rapid flow fluctuations that cancel typical batteries, while the batteries manage storage needs in the longer term in the longer term.”
In the research paper “Duble level design for cost-effective size and energy management of hybrid energy storage in photovoltaic systems“Published in Green energy and intelligent transportThe academics explained that their strategy “on dual-level” Takes an adaptive low -pass filter (LPF) to distribute power over the grid, the battery and the Supercondensator, which is said to ensure that each component works within its optimum parameters.
In the proposed system configuration, the battery and the super capacitor are parallel to each other in an active connection. The PV system is connected to the same DC bus by a separate DC -DC converter as the battery and super capacitor. For their modeling, they took a PV capacity of 6 kW and a battery capacity of 4 kWh.
Due to a series of simulations, the scientists have determined that the slope of the self -supply of the total system decreases when the PV and the battery capacity increase. “When it is more than 60%, the slope of self -supply becomes much smaller, which means that the knee point (KP) is around 60%, and many extra investments can only get a little improvement in energy autonomy after this point,” they explained further. “That is why it is reasonable to set the self -supply to 60% to balance the costs and the degree of self -supply.”
They also discovered that when the current slope is greater than 10%, the time constant (TC) of the lithium ion battery increases and vice versa, the TC decreases. Moreover, they discovered that, on sunny days and cloudy days, the proposed approach has a minimal effect on the reduction of the battery cycle. “This is due to the few current fluctuations on this type of day, and the battery sate-of-load (SOC) has been in the optimum condition without adjusting the TC,” they emphasized.
The analysis also showed that, compared to the fixed TC strategies, the new method reduces the battery cycles by 13.2%, from 1.06 to 0.91, with the SC -CYCLI “somewhat” increasing from 14.24 to 14.38, the scientists said that it is acceptable due to the long lifespan of the long lifetime of lifetime.
The new strategy also says that it improves the use of SC without affecting the self -supply and visiting the battery too much too much and using too much. “It applies on a large scale to different areas and weather conditions, especially again with rapidly changing irradiation,” the scientists concluded.
Looking ahead, they want to record extra factors for aging batteries and validating their findings with real battery cells in field conditions. “Future research will also quantify the economic benefits, offering an extensive techno-economic analysis,” they added.
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