Energy storage system
First Claim
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1. An energy storage system comprising:
- a plurality of storage mediums having substantially different energy and power density each connected to a DC bus via a respective bidirectional isolated DC-DC converter; and
a controller configured to independently determine a current demand for each storage medium based on a control mode;
wherein a plurality of bidirectional isolated DC-DC converters connected to one or more first storage medium are connected in a modified input parallel output series configuration, a plurality of bidirectional isolated DC-DC converters connected to one or more second storage medium are connected in an input parallel output series configuration and the two pluralities of bidirectional isolated DC-DC converters are intermediately bridged.
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Abstract
An energy storage system comprises a plurality of storage mediums having substantially different energy and power density that are each connected to a DC bus via a respective bidirectional isolated DC-DC converter; and a controller configured to independently determine a current demand for each storage medium based on a control mode.
11 Citations
21 Claims
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1. An energy storage system comprising:
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a plurality of storage mediums having substantially different energy and power density each connected to a DC bus via a respective bidirectional isolated DC-DC converter; and a controller configured to independently determine a current demand for each storage medium based on a control mode; wherein a plurality of bidirectional isolated DC-DC converters connected to one or more first storage medium are connected in a modified input parallel output series configuration, a plurality of bidirectional isolated DC-DC converters connected to one or more second storage medium are connected in an input parallel output series configuration and the two pluralities of bidirectional isolated DC-DC converters are intermediately bridged. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An energy apparatus comprising;
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an energy generation system, and an energy storage system adjacent to the energy generation system and configured to absorb any excess power and supply any shortfall power from the energy generation system; wherein the energy storage system comprises; a plurality of storage mediums having substantially different energy and power density each connected to a DC bus via a respective bidirectional isolated DC-DC converter; and a controller configured to independently determine a current demand for each storage medium based on a control mode; wherein a plurality of bidirectional isolated DC-DC converters connected to one or more first storage medium are connected in a modified input parallel output series configuration, a plurality of bidirectional isolated DC-DC converters connected to one or more second storage medium are connected in an input parallel output series configuration and the two pluralities of bidirectional isolated DC-DC converters are intermediately bridged. - View Dependent Claims (19, 20)
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21. A method of distributing current between a plurality of energy storage mediums connected between a generator and a load comprising:
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determining an overall current demand based on an instantaneous generation of power from the generator and an instantaneous load power from the load; controlling a current of a slow response energy storage medium based on a low frequency component of the overall current demand; and controlling a current of a fast response energy storage medium based on a high frequency component of the overall current demand; wherein the plurality of energy storage mediums are each connected to a DC bus via a respective bidirectional isolated DC-DC converter; and wherein a plurality of bidirectional isolated DC-DC converters connected to one or more first storage medium are connected in a modified input parallel output series configuration, a plurality of bidirectional isolated DC-DC converters connected to one or more second storage medium are connected in an input parallel output series configuration and the two pluralities of bidirectional isolated DC-DC converters are intermediately bridged.
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Specification