Battery energy storage and power system
AssigneeABB Research Ltd.
InventorsTomas Tengner, Roberto Alves
Life of this patent
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Abstract
Battery energy storage arranged to be connected to a direct current capacitor, which is connected in parallel to a power converter. The battery energy storage includes a battery module and a controllable voltage source adapted to inject a voltage opposite to a voltage ripple of the direct current capacitor. A power system including such battery energy storage and a direct current capacitor is also disclosed.
Claims19
A battery energy storage arranged to be connected to a direct current capacitor, which is connected in parallel to a power converter, the battery energy storage comprising:
- a battery module, and
- a controllable voltage source that is electrically connected to the battery module via an electrical conductor and that electrically isolates a DC link current ripple of the direct current capacitor from the battery module by electrically injecting, directly into the electrical conductor, a voltage opposite to a voltage ripple of the direct current capacitor and provides the battery module with a steady DC terminal voltage.
A power system for connection to an alternating current load, the power system comprising:
- a power converter for connection to the load,
- a direct current capacitor connected in parallel to the power converter, and
- a battery energy storage connected in parallel to the direct current capacitor, the battery energy storage comprising a battery module and a controllable voltage source that is electrically connected to the battery module via an electrical conductor and that electrically isolates a DC link current ripple of the direct current capacitor from the battery module by electrically injecting, directly into the electrical conductor, a voltage opposite to a voltage ripple of the direct current capacitor and provides the battery module with a steady DC terminal voltage.
Dependencies are inferred from the claim text.