OPTIMIZED FILTER FOR BATTERY ENERGY STORAGE ON ALTERNATE ENERGY SYSTEMS

• US 20150180273A1
• Filed: 12/23/2013
• Published: 06/25/2015
• Est. Priority Date: 12/23/2013
• Status: Active Grant

• Current Assignee: GE Grid Solutions LLC (GE Aerospace)
• Original Assignee: General Electric Company
• Inventors: Wagoner, Robert Gregory, Ritter, Allen Michael
• Granted Patent: US 9,337,685 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F03D 9/11 storing electrical energy
• CPC Class Codes: F03D 9/255 connected to electrical distribution networks; Arrangements therefor
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy wind motors F03D
• CPC Class Codes: H02J 3/28 Arrangements for balancing of the load in a network by storage of energy
• CPC Class Codes: H02J 3/32 using batteries with converting means
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 7/1415 with a generator driven by a prime mover other than the motor of a vehicle
• CPC Class Codes: H02M 1/12 Arrangements for reducing harmonics from ac input or output
• CPC Class Codes: H02M 1/123 Suppression of common mode voltage or current
• CPC Class Codes: H02M 5/293 using semiconductor devices only
• CPC Class Codes: H02M 5/44 using discharge tubes or semiconductor devices to convert the intermediate dc into ac
• CPC Class Codes: H02P 9/007 Control circuits for doubly fed generators
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin

Abstract

A system for operating a power generation system within a battery storage/discharge mode includes a power convertor having a DC link, a switching module coupled to the DC link, a storage device, and a filter coupled between the storage device and power converter. The filter may correspond to a normal mode filter configured to limit normal mode voltage from being applied to the storage device. A common mode filter may be associated with the storage device. The storage device may correspond to one or more batteries while the power generation system may correspond to a wind-driven generator.

Claims

1. A system for operating a power generation system within an energy storage/discharge mode, the system comprising:

a power convertor including a DC link;

a switching module coupled to said DC link;

an energy storage device; and

a filter coupled between said switching module and said energy storage device,

wherein said filter comprises a normal mode filter having a series coupled inductor and capacitor corresponding to an inductor leg and a capacitor leg, and

wherein said inductor leg is coupled to said power converter and said capacitor leg is coupled to said DC link.

2. The system of claim 1, wherein said switching module is configured as a bi-directional DC-to-DC converter for controlling the flow of power to and from said energy storage device.

3. The system of claim 1, wherein said energy storage device comprises at least one battery.

4. The system of claim 1, wherein said energy storage device comprises a plurality of batteries.

5. The system of claim 4, wherein said plurality of batteries are coupled in parallel.

6. The system of claim 1, further comprising a second filter associated with said energy storage device.

7. The system of claim 6, wherein said second filter comprises a common mode filter.

8. The system of claim 7, wherein said common mode filter comprises an inductive device coupled in parallel with said capacitor leg of said normal mode filter.

9. The system of claim 1, wherein said power converter comprises an IGBT pulse width modulator (PWM) and said inductor leg is coupled to said IGBT PWM.

10. The system of claim 1, wherein said power converter comprises at least a pair of IGBTs coupled in series across said DC link and said inductive leg is couple to a common point between said pair of IGBTs.

11. A wind turbine system, comprising:

a wind-driven generator;

a power convertor including a DC link associated with said wind-driven generator;

a switching module coupled to said DC link;

an energy storage device; and

a filter coupled between said switching module and said energy storage device,

wherein said filter comprises a normal mode filter having a series coupled inductor and capacitor corresponding to an inductor leg and a capacitor leg, and

wherein said inductor leg is coupled to said power converter and said capacitor leg is coupled to said DC link.

12. The system of claim 11, wherein the switching module is configured to be operated as a bi-directional DC-to-DC converter for controlling the flow of power to and from said energy storage device.

13. The system of claim 11, wherein, said energy storage device comprises one or more batteries.

14. The system of claim 13, wherein said energy storage device comprises a plurality of batteries coupled in parallel.

15. The system of claim 11, further comprising a second filter associated with said energy storage device.

16. The system of claim 15, wherein said second filter comprises a common mode filter configured as an inductive device coupled in parallel with said capacitor leg of said normal mode filter.

17. The system of claim 11, wherein said power converter comprises an IGBT pulse width modulator (PWM) and said inductor leg is coupled to said IGBT PWM.

18. The system of claim 11, wherein said power converter comprises at least a pair of IGBTs coupled in series across said DC link and said inductive leg is couple to a common point between said pair of IGBTs.

19. A method for operating a power generation system within an energy storage/discharge mode, the power generation system including a power convertor having a DC link, the power generation system further including a switching module coupled to the DC link and an energy storage device, the method comprising:

controlling the operation of the switching module such that power is directed between the DC link and the energy storage device; and

transmitting the power through a filter coupled between the DC link and the energy storage device, the filter comprising a normal mode filter having a series coupled inductor and capacitor corresponding to an inductor leg and a capacitor leg, the inductor leg being coupled to the switching module and the capacitor leg being coupled to the DC link.

20. The method of claim 19, wherein the filter is a first filter, further comprising transmitting the power through a second filter coupled between the DC link and the energy storage device, the second filter being configured as a common mode filter.