System and method for optimizing energy storage device cycle life

摘要

A multi-energy storage device system is provided that includes a first energy storage device (ESD) coupled to a direct current (DC) link. A bi-directional buck/boost converter includes an output channel coupled to the DC link and an input channel. A second ESD coupled to the input channel has a usable energy storage range defining an entire amount of usable energy storable therein. A database includes stored information related to a known acceleration event. A system controller is configured to acquire the stored information related to the known acceleration event and, during the known acceleration event, cause the buck/boost converter to boost the voltage of the second ESD and to supply the boosted voltage to the DC link such that after the known acceleration event, the state of charge of the second ESD is less than or substantially equal to a minimum usable energy storage state of charge.

主权项

1. A multi-energy storage device system comprising:
a first energy storage device coupled to a direct current (DC) link; a load coupled to the DC link and configured to receive energy from the DC link; a bi-directional buck/boost converter assembly comprising a first bi-directional buck/boost converter, the first bi-directional buck/boost converter comprising an output channel coupled to the DC link and comprising a first input channel; a second energy storage device coupled to the first input channel of the first bi-directional buck/boost converter via a first DC bus, the second energy storage device having a usable energy storage range defining an entire amount of usable energy storable in second energy storage device; a database comprising stored information related to a known acceleration event in which a supply of energy to the load is desired; and a system controller configured to:
acquire the stored information related to the known acceleration event; andduring the known acceleration event, cause the first bi-directional buck/boost converter to boost the voltage of the second energy storage device and to supply the boosted voltage to the DC link to power the load such that after the known acceleration event, the state of charge of the second energy storage device is less than or substantially equal to a minimum usable energy storage state of charge; wherein the first bi-directional buck/boost converter bucks and boosts voltages received thereby so as to provide voltage to a high voltage side and a low voltage side of the multi-energy storage device system; and wherein the first energy storage device is coupled to the DC link on the high voltage side of the multi-energy storage device system and the second energy storage device is coupled to the first input channel of the first bi-directional buck/boost converter on the low voltage side of the multi-energy storage device system.