Determining optimal state of charge for a military vehicle microgrid Online publication date: Sat, 30-Aug-2014
by Denise M. Rizzo; Gordon G. Parker
International Journal of Powertrains (IJPT), Vol. 3, No. 3, 2014
Abstract: Military hybrid vehicles possess all the attributes of a microgrid - power generation, consumption, energy storage and the ability to operate in both grid connected and island mode. Therefore, a holistic view of energy use can be realised by considering a military hybrid vehicle as a microgrid and utilising energy optimisation methods from stationary microgrids, namely battery state of charge (SOC) optimisation. This paper describes a methodology to determine the optimal SOC for a given drive cycle to minimise fuel consumption. A two step approach was utilised where the first step used the drive cycle's speed profile to determine SOC basis functions. The second step used a numerical optimisation approach to determine the function weights that minimised fuel consumption using a dynamic model of the hybrid vehicle. A simulation example is presented using the US Army Urban Assault drive cycle. The approach reduced fuel consumption by 5.7% compared to using a fixed SOC level.
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