System and method for optimizing energy storage device cycle life
First Claim
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; and
during 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.
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Abstract
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.
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Citations
22 Claims
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1. A multi-energy storage device system comprising:
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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; and during 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of assembling a propulsion energy system, the method comprising:
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coupling a first energy storage device to a direct current (DC) link; coupling an output channel of a bi-directional buck/boost converter to the DC link, the bi-directional buck/boost converter configured to buck and boost voltages received thereby so as to provide voltage to a high voltage side and a low voltage side on the propulsion system; coupling a second energy storage device to a first input channel of the bi-directional buck/boost converter, the second energy storage device having a usable energy storage range defining an entire amount of usable energy storable in second energy storage device; coupling a load to the DC link, the load configured to receive energy from one of the first energy storage device and the second energy storage device via the DC link; coupling a controller to the bi-directional buck/boost converter and to the load; and configuring the controller to; acquire a first set of stored information from a storage database, the first set of stored information related to a known acceleration event in which energy is to be supplied to the load; and cause the bi-directional buck/boost converter to boost an the stored voltage in the second energy storage device during the known acceleration event 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 coupling the first energy storage device comprises coupling the first energy storage device to the DC link on the high voltage side of the propulsion system; and wherein coupling the second energy storage device comprises coupling the second energy storage device to the first input channel of the bi-directional buck/boost converter on the low voltage side of the propulsion system. - View Dependent Claims (16, 17, 18, 19)
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20. A non-transitory computer readable storage medium having a computer program stored thereon and representing a set of instructions that when executed by a computer causes the computer to:
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access a database comprising stored information related to a known acceleration event in which a supply of energy to a load is recorded for increasing a speed of rotation associated with the load; cause a bi-directional buck/boost converter to boost voltage from a first energy storage device and to supply the boosted voltage to a DC link to power the load during the known acceleration event to increase the speed of rotation associated with the load such that after the known acceleration event, the state of charge of the first energy storage device is less than or substantially equal to a minimum usable energy storage state of charge, wherein the first energy storage device has a usable energy storage range defining an entire amount of usable energy storable therein. - View Dependent Claims (21, 22)
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Specification