Method of achieving variable performance of an electric generator

Patent metadata

Field	Value
Publication number	US-10141816-B2
Application number	US-201514938382-A
Country	US
Kind code	B2
Filing date	Nov 11, 2015
Priority date	Jan 21, 2015
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

Disclosed is a method of operating a large electric generator, the generator having a rotor arranged along a centerline of the generator, a core arranged coaxially and surrounding the rotor; a plurality of stator windings arranged within the core; a stator frame arranged to fixedly support the core and rotationally support the rotor; a gas cooling system that circulates a cooling gas within the generator, the method steps including circulating a cooling liquid that cool the stator windings; sensing an output parameter of the generator; comparing via a control system the sensed output parameter of the generator to a predetermined scheme; and sending a control signal to an adjusting device in accordance with the control system comparison.

First claim

What is claimed is:

1. A method of operating a large electric generator, the generator having a rotor arranged along a centerline of the generator, a core arranged coaxially and surrounding the rotor; a plurality of stator windings arranged within the core; a stator frame arranged to fixedly support the core and rotationally support the rotor; a gas cooling system that circulates a cooling gas within the generator, the method steps comprising:
circulating a cooling liquid that cool the stator windings;
sensing an output parameter of the generator;
comparing via a control system the sensed output parameter of the generator to a predetermined scheme;
sending a control signal to an adjusting device in accordance with the control system comparison; and
adjusting a pressurizing system in accordance with the control signal.

2. The method of claim 1 , wherein the adjusting device permits the increase or decrease of cooling gas pressure via the pressurizing system.

3. The method of claim 1 , wherein the adjusting device adjusts circulation of the cooling liquid.

4. The method of claim 1 , wherein the adjusting device is a control valve.

5. The method of claim 1 , wherein the cooling ability of the cooling gas is a function of the sensed output parameter of the generator.

6. The method of claim 1 , wherein the predetermined scheme minimizes temperature fluctuations of the stator and rotor windings.

7. The method of claim 1 , wherein the predetermined scheme minimizes thermal stresses of the stator and rotor windings.

8. The method of claim 1 , wherein the predetermined scheme maximizes the efficiency of the generator.

9. The method of claim 1 , wherein the predetermined scheme maximizes the power output of the generator.

Assignees

• Siemens Energy Inc

Inventors

• Garmon Michael D
• Rico Raul Ricardo
• Warren Bobby A

Classifications

• H02K9/08 Primary

  by gaseous cooling medium circulating wholly within the machine casing (H02K9/10 takes precedence) · CPC title

• H02K9/197 Primary

  in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator · CPC title

• H02K2213/09

  Machines characterised by the presence of elements which are subject to variation, e.g. adjustable bearings, reconfigurable windings, variable pitch ventilators · CPC title

• H02K9/10 Primary

  by gaseous cooling medium flowing in closed circuit, a part of which is external to the machine casing · CPC title

• H02K3/24

  with channels or ducts for cooling medium between the conductors · CPC title