Hybrid energy storage system

• US 5,939,798 A
• Filed: 06/17/1997
• Issued: 08/17/1999
• Est. Priority Date: 06/17/1997
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Miller, Nicholas Wright
• Primary Examiner(s): Gaffin, Jeffrey
• Assistant Examiner(s): KAPLAN, JONATHAN STUART
• Application Number:
  US08/877,224
• Time in Patent Office: 791 Days
• Field of Search: 307/43, 307/44, 307/64, 307/65, 307/66, 307/80, 307/82
• US Class Current: 307/64
• CPC Class Codes: H02J 9/062 for AC powered loads
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
• CPC Class Codes: Y02P 90/40 Fuel cell technologies in production processes

Abstract

An energy storage system including a first power conversion device and a second power conversion device for providing energy to loads upon interruption of a main power source. A first power conversion device is connected in parallel to a first load, receives energy from an energy storage device and provides power to the first load. A second power conversion device is connected in series with a second load, receives energy from the energy storage device and provides power to the second load. The first and second power conversion devices are rated so that power consumption by the power conversion devices is reduced.

Claims

1. An energy storage system for supplying power to a first load and a second load in the event that a connection to a main power source is interrupted, the system comprising:

an energy storage device for storing energy;

a first power conversion device connected in series to said energy storage device, wherein the first power conversion device and the energy storage device are connected in parallel to the first load; and

a second power conversion device, wherein said first power conversion device said second power conversion device and the second load are connected in series.

2. The energy storage system of claim 1 wherein said first power conversion device includes:

a bidirectional AC-DC power converter connected to said energy storage device.

3. The energy storage system of claim 1 wherein said second power conversion device includes:

a DC to AC power converter having an input connected to the first power conversion device and said energy storage device and an output connected to the second load.

4. The energy storage device of claim 1 wherein said energy storage device is connected to said first power conversion device and said second power conversion device at a junction disposed therebetween.

5. An energy storage system for supplying power to a first load and a second load in the event that a connection to a main power source is interrupted, the system comprising:

an energy storage device for storing energy;

a first power conversion device connected in series to said energy storage device, wherein the first power conversion device and the energy storage device are connected in parallel to the first load, the first power conversion device including;

a bi-directional AC-DC power converter connected to said energy storage device;

a second power conversion device, wherein said first power conversion device, said second power conversion device and the second load are connected in series, said second power conversion device including;

a DC to AC power converter having an input connected to said bi-directional AC-DC power converter and said energy storage device and an output connected to the second load.

6. The energy storage device of claim 5 wherein said energy storage device is connected to said first power conversion device and said second power conversion device at a junction disposed therebetween.