Power distribution systems

• US 8,680,707 B2
• Filed: 10/12/2010
• Issued: 03/25/2014
• Est. Priority Date: 10/13/2009
• Status: Expired due to Fees

• Current Assignee: GE Energy Power Conversion Technology Limited (General Electric Company)
• Original Assignee: GE Energy Power Conversion Technology Limited (General Electric Company)
• Inventors: Childs, Jonathan, Crane, Allan David
• Primary Examiner(s): AMAYA, CARLOS DAVID
• Application Number:
  US12/902,180
• Publication Number:
  US 20110084670A1
• Time in Patent Office: 1,260 Days
• Field of Search: 307/9.1, 322/90, 290/4.R, 290/9
• US Class Current: 307/9.1
• CPC Class Codes: B60L 1/00 Supplying electric power to auxiliary equipment of vehicles circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: B60L 2200/32 Waterborne vessels
• CPC Class Codes: B60L 2220/58 with more than three phases
• CPC Class Codes: B60L 50/13 using AC generators and AC motors
• CPC Class Codes: B63H 21/17 by electric motor
• CPC Class Codes: B63H 23/24 electric dynamo-electric machines H02K
• CPC Class Codes: H02J 2310/42 for ships or vessels
• CPC Class Codes: H02J 3/01 Arrangements for reducing harmonics or ripples
• CPC Class Codes: H02P 25/22 Multiple windings; Windings for more than three phases
• CPC Class Codes: Y02E 40/40 Arrangements for reducing harmonics
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

Abstract

The present invention relates to power distribution systems (e.g. a marine power distribution and propulsion system) that include first and second ac distribution busbars. The first ac distribution busbar will typically be a medium voltage busbar for the propulsion drive systems and the second ac distribution busbar will typically be a low voltage for ships services. A 12-pulse rectifier has its ac terminals electrically connected to the first ac distribution busbar. A multiple output generator has first and second galvanically-isolated stator windings. The first stator winding provides a six-phase ac output and is connected to the first ac distribution busbar. The second stator winding provides a three-phase ac output and is connected to the second ac distribution busbar. The six-phase ac output is phase shifted relative to the three-phase ac output to reduce the problematic coupling of harmonic distortion between the first and second ac distribution busbars.

Claims

1. A power distribution system comprising:

a first and second distribution busbars;

a multi-pulse rectifier having terminals electrically connected to the first and second distribution busbars; and

a multiple output generator having ID first and second subsidiary stator windings associated with a first stator winding and (ii) a second stator winding having a second multi-phase ac output;

wherein the first subsidiary stator winding provides a first phase group of a first multi-phase ac output with n phases, the first phase group being connected to the first distribution busbar;

wherein the second subsidiary stator winding provides a second phase group of the first multi-phase ac output with n phases, the second phase group being connected to the second distribution busbar; and

wherein the n phases of the first multi-phase ac output are symmetrically phase shifted relative to the multi-phases of the second ac output.

2. The power distribution system of claim 1, wherein the first phase group of the n phases of the first multi-phase ac output is phase shifted by a predetermined positive angle relative to the n phases of the second ac output and the second phase group of the n phases of the first ac output is phase shifted by a predetermined negative angle relative to the multi-phases of the second ac output.

3. The power distribution system of claim 2, wherein the predetermined positive angle and the predetermined negative angle have substantially the same magnitude.

4. The power distribution system of claim 1, wherein the first ac output is a six-phase ac output and the second ac output is a three-phase output.

5. The power distribution system of claim 4, wherein the multi-pulse rectifier is a 12-pulse rectifier.

6. The power distribution system of claim 1, wherein three phases of the first ac output are phase shifted by a predetermined positive angle relative to the second ac output and three phases of the first ac output are phase shifted by a predetermined negative angle relative to the second ac output.

7. The power distribution system of claim 6, wherein the predetermined positive angle is about +15 degrees and the predetermined negative angle is about −

15 degrees.

8. The power distribution system of claim 1, wherein the first ac output is a twelve-phase ac output and the second ac output is a three-phase ac output.

9. The power distribution system of claim 8, wherein three phases of the first ac output are phase shifted by a first predetermined positive angle relative to the second ac output, three phases of the first output are phase shifted by a second predetermined positive angle relative of the second ac output, three phases of the first ac output are phase shifted by a first predetermined negative angle relative to the second ac output, and three phases of the first ac output are phase shifted by a second predetermined negative angle relative to the second ac output.

10. The power distribution system of claim 9, wherein the first predetermined positive angle is about +22.5 degrees, the second predetermined angle is about +7.5 degrees, the first predetermined negative angle is about −

7.5 degrees, and the second predetermined negative angle is about −

22.5 degrees.

11. The power distribution system of claim 8, wherein the multi-pulse is a 24-pulse rectifier.

12. The power distribution system of claim 1, further comprising a capacitor bank connected to the second ac output.

13. The power distribution system of claim 1, wherein the first distribution busbar carries an ac distribution voltage.

14. The power distribution system of claim 13, wherein the multi-pulse rectifier is electrically connected between the first distribution busbar and an electrical load.

15. The power distribution system of claim 1, wherein the first distribution busbar carries a dc distribution voltage and the multi-pulse rectifier is electrically connected between the first stator winding and the first distribution busbar to rectify the first ac output.