Explicit degradation modelling in optimal lead–acid battery use for photovoltaic systems

Amir-Sina Hamedi; Abbas Rajabi-Ghahnavieh

Explicit degradation modelling in optimal lead–acid battery use for photovoltaic systems

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Author(s): Amir-Sina Hamedi ¹ and Abbas Rajabi-Ghahnavieh ¹
- Affiliations: 1: Department of Energy Engineering, Sharif University of Technology, Tehran, Iran
Source: Volume 10, Issue 4, 10 March 2016, p. 1098 – 1106
DOI: 10.1049/iet-gtd.2015.0163 , Print ISSN 1751-8687, Online ISSN 1751-8695

Received 31/01/2015, Accepted 02/12/2015, Revised 14/10/2015, Published 10/03/2016

Lead–acid battery is a storage technology that is widely used in photovoltaic (PV) systems. Battery charging and discharging profiles have a direct impact on the battery degradation and battery loss of life. This study presents a new 2-model iterative approach for explicit modelling of battery degradation in the optimal operation of PV systems. The proposed approach consists of two models: namely, economic model and degradation model which are solved iteratively to reach the optimal solution. The economic model is a linear programming optimisation problem that calculates the optimal hourly battery use profile based on an assumed value of the battery degradation cost. The degradation model, in turn, gives the battery degradation cost based on the battery use profile, temperature and battery characteristics. The models are solved iteratively to finally reach to the optimal battery use considering battery degradation. The proposed approach has been applied to a 4 kWp PV system and the performance of the proposed approach were evaluated. Applicability of the proposed approach in determining the optimal storage size and the economic battery life were also shown. Advantages and the capability of the proposed approach in considering PV generation and irradiation variations were also evaluated through seasonality analysis.

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Explicit degradation modelling in optimal lead–acid battery use for photovoltaic systems

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