Coupling battery electric vehicles (BEV) with photovoltaic (PV) powered stationary storage can significantly increase the energy efficiency of traction power supply. This applies especially to BEV and PV storage at safety extra low voltage (SELV) level e.g. 48 V. This paper describes an under-complex – but still suitable for everyday use - direct coupling and compares it to the usual BEV coupling via the 230 V AC grid. For this purpose, a simple equivalent circuit for analytical charging efficiency determination as well as a much more detailed MATLAB-Simulink model of the direct coupling is derived and validated for real BEV. This enables the quantification of the everyday benefits for different mobility scenarios. For LiFePO PV storage systems that are slightly larger than the traction battery, the efficiency advantage of direct coupling compared to coupling via the AC grid is about 15%, based on 30–40 average kilometers per day. For longer periods of standstill during the day, the efficiency advantage can be as high as 20%. Direct coupling is thus an effective measure to use decentrally generated solar energy for emission-free mobility.
48 V Coupling of Traction and PV-Storage Battery
Proceedings
2022-03-14
12 pages
Article/Chapter (Book)
Electronic Resource
German
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