Techno-economic evaluation of a battery system integrated into a residential grid-connected PV system considering battery degradation Masoume Shabani, Fredrik Wallin, Erik Dahlquist, Jinyue Yan

Abstract

Stationary battery storages become a promising solution for improving flexibility of renewable energy system to balance the fluctuating of power production and demand. However, each application has a specific operational strategy, consequently a specific dynamic operational profile which leads to a different estimated battery lifetime due to the degradation of battery capacity over its operation in the application. An accurate knowledge about battery lifetime, and battery state of health at different operational conditions is important to ensure a feasible techno-economic assessment. This paper deals with the techno-economic evaluation of a battery system integrated into a residential grid-connected PV system considering two battery models with and without battery degradation. The battery life cycle cost, the self-sufficiency ratio and battery lifetime are analyzed for techno-economic assessment of a residential grid-connected hybrid PV-battery system. The results show that the simulation without battery degradation gives 31.43% lower life cycle cost and 7.4% higher self-sufficiency ratio, compared to the modeling with battery degradation. This proves the importance of battery aging model for assessing a battery integrated into a renewable PV system.

Keywords Battery storage, battery aging models, techno-economic assessment, residential grid-connected Photovoltaic system, distributed renewable energy