Techno-economic analysis of second-life lithium-ion batteries integration in microgrids
Résumé
Predicting ageing and performance of storage devices integrated in a global system is necessary to ensure the emergence of microgrids that promote grid services such as self-consumption. This paper deals with a techno-economic tool that allows to model a microgrid connected to the electrical grid and composed of photovoltaic solar panels, a second life Litihium ion battery and power consumers. This tool enables us to simulate the behaviour of the microgrid during a time scope of several years (life cycle based analysis). Economic indicators are also given in order to estimate the profitability of the overall system compared to the case where all the energy consumed would be purchased from the electricity grid. To achieve this, the tool has to be developed with a battery model that includes both a behavioural model (Tremblay-Dessaint) to simulate the evolution of voltage and state of charge, coupled with an ageing model to predict the capacity and power losses during cycling. The analysis highlights the strong sensitivity of storage performance and cost to economic parameters, the importance of degrading the model parameters with ageing and gives optimistic trends for the future of second-life batteries.
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