With the topic of plug-in HEV (Hybrid Electric Vehicles) city buses, the highly coupled optimization problem is studied for finding the most cost efficient compromise between investing in onboard electric powertrain components and installing a charging infrastructure along the bus line. It is described how convex optimization can be used to find the optimal battery sizing for a series HEV with fixed engine and generator unit and a fixed charging infrastructure along the bus line. The novelty of the proposed optimization approach is that both the battery sizing and the energy management strategy are optimized simultaneously by solving a convex problem. In the optimization approach the power characteristics of the engine-generator unit are approximated by a convex, second order polynomial, and the convex battery model assumes quadratic losses. An example is also presented for a specific bus line, showing the dependence between the optimal battery sizing and the number of charging stations on the bus line.
Convex optimization of charging infrastructure design and component sizing of a plug-in series HEV powertrain
2011
6 Seiten, 5 Bilder, 2 Tabellen, 10 Quellen
Conference paper
Storage medium
English
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