EXCITATION DEVICE

• US 20130033238A1
• Filed: 06/28/2012
• Published: 02/07/2013
• Est. Priority Date: 06/29/2011
• Status: Active Grant

• Current Assignee: General Electric Technology GmbH (GE Vernova, Inc.)
• Original Assignee: Alstom Technology Ltd. (Alstom SA)
• Inventors: Hobelsberger, Max
• Granted Patent: US 9,293,955 B2
• Time in Patent Office: Days
• US Class Current: 322/63
• CPC Class Codes: H02K 11/30 Structural association with control circuits or drive circuits
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 19/26 characterised by the arrangement of exciting windings
• CPC Class Codes: H02K 3/04 Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
• CPC Class Codes: H02M 7/48 using discharge tubes with control electrode or semiconductor devices with control electrode
• CPC Class Codes: H02P 25/092 Converters specially adapted for controlling reluctance motors
• CPC Class Codes: H02P 27/08 with pulse width modulation
• CPC Class Codes: H02P 3/18 for stopping or slowing an ac motor
• CPC Class Codes: H02P 9/14 by variation of field H02P9/08, H02P9/10 take precedence

Abstract

In an excitation device for stators of generators for high-induction measurement, the greatest possible compensation of the reactive power requirement is achieved. Depending on the size and energy requirement of the generator, a number of individual excitation modules with a corresponding number of individual excitation windings are provided, wherein a minimum necessary total excitation current can be supplied by superimposing the individual currents of the excitation windings.

Claims

1. An excitation device, for stators and generators for high-induction measurement having a greatest possible compensation of a reactive power requirement, comprising a plurality of individual excitation modules with a corresponding plurality of individual excitation windings, depending on size and energy requirements of the generator, wherein a necessary total excitation current is provided by superimposing individual currents of the excitation windings.

2. The excitation device as claimed in claim 1, wherein the individual excitation module is coupled to a number of excitation turns.

3. The excitation device as claimed in claim 2, wherein part of the total excitation current required is provided by the excitation winding.

4. The excitation device as claimed in claim 1, wherein the individual excitation modules have a controlled and mutually synchronizable output current feed.

5. The excitation device as claimed in claim 1, wherein the total current required flows in a time characteristic by superimposing the individual currents of the excitation windings.

6. The excitation device as claimed in claim 1, wherein the individual excitation modules are equipped with individual electrical link circuits.

7. The excitation device as claimed in claim 6, wherein the individual link circuits are equipped with energy-storing devices.

8. The excitation device as claimed in claim 1, wherein the individual excitation module draws an individually required active power from a supplied energy source.

9. The excitation device as claimed in claim 1, wherein the excitation windings of the individual excitation modules have an electrical circuit which minimizes a voltage between the excitation windings.

10. The excitation device as claimed in claim 9, wherein the excitation windings of the individual excitation modules have electrical circuits which are isolated from one another.

11. The excitation device as claimed in claim 10, wherein the individual excitation windings do not form an electrical series connection.

12. The excitation device as claimed in claim 1, wherein an output current of the excitation device is controlled in such a way that the excitation device functions as a current source so that the output current supplied thereby is supplied regardless of load conditions which occur.

13. The excitation device as claimed in claim 1, wherein the individual excitation module has its own energy store, which absorbs at least part of a total reactive energy which occurs.

14. The excitation device as claimed in claim 1, wherein the individual excitation module has an output filter.

15. The excitation device as a claimed in claim 14, wherein the output filter comprises a series inductor in the output circuit.

16. The excitation device as claimed in claim 15, wherein the output filter comprises a series arrangement of inductors and a parallel arrangement of capacitors.