Systems and methods for adjusting operations of a gas turbine following a transient event

Patent metadata

Field	Value
Publication number	US-10205414-B2
Application number	US-201615163451-A
Country	US
Kind code	B2
Filing date	May 24, 2016
Priority date	May 24, 2016
Publication date	Feb 12, 2019
Grant date	Feb 12, 2019

Abstract

A method may involve monitoring a first set of electrical properties associated with an electrical grid configured to couple to a generator and determining whether a transient event is present on the electrical grid based on the first set of electrical properties. The method may also involve determining a mechanical power present on a shaft of the generator based on a second set of electrical properties associated with the generator, the electrical grid, or both when the transient event is present and sending the mechanical power to a controller associated with a turbine configured to couple to the generator, wherein the controller is configured to adjust one or more operations of the turbine based on the mechanical power.

First claim

The invention claimed is:

1. A system, comprising:
a turbine comprising a first controller configured to control one or more operations of the turbine;
a generator configured to couple to the turbine, wherein the generator is configured to provide power to an electrical grid;
an exciter configured to provide a direct current (DC) voltage and a DC current to a rotor of the generator, wherein the exciter comprises a second controller configured to:
monitor a first set of electrical properties associated with the electrical grid;
determine whether a transient event is present on the electrical grid based on the first set of electrical properties;
determine a mechanical power present on a shaft of the generator based on a second set of electrical properties associated with the generator, the electrical grid, or both in response to the transient event being present, wherein the second set of electrical properties comprises a power output by the generator and an accelerating power associated with the rotor of the turbine, and wherein the mechanical power comprises an indication of energy used to rotate the shaft; and
send the mechanical power to the first controller, wherein the first controller is configured to adjust the one or more operations to provide stability between the first set of electrical properties and a rotation of the shaft, based on the mechanical power.

2. The system of claim 1 , wherein the first controller is configured to adjust the one or more operations of the turbine based on the mechanical power.

3. The system of claim 1 , wherein the one or more operations comprise air and fuel ratio of the turbine, a Dry Low NOx (DLN) mode of the turbine, an operation of one or more nozzles used for combustion within the turbine, or any combination thereof.

4. The system of claim 1 , wherein the first set of electrical properties comprise a frequency associated with the electrical grid, active power associated with the generator, reactive power associated with the generator, voltage associated with the electrical grid, current associated with the electrical grid, power associated with the electrical grid, a power factor associated with the electrical grid, or any combination thereof.

5. The system of claim 1 , wherein the second set of electrical properties comprises an inertia on the shaft in the generator.

6. The system of claim 1 , wherein the second controller is configured to determine the mechanical power according to:

Pm
=

d
dt

⁡

[

∫

Pm
-
Pe

H

⁢
dt

]

×
2
⁢

⁢
H

+
Pe

wherein Pm is the mechanical power, H is inertia on the shaft, and Pe is a power output by the generator.

7. The system of claim 1 , wherein the second controller determines that the transient event is present on the electrical grid when a frequency, voltage, current, power, or power factor associated with the electrical grid increases or decreases more than a threshold.

8. The system of claim 1 , wherein the second controller sends the mechanical power to the first controller via a communication network.

9. A method, comprising:
monitoring a first set of electrical properties associated with an electrical grid configured to couple to a generator;
determining whether a transient event is present on the electrical grid based on the first set of electrical properties;
determining a mechanical power present on a shaft in the generator based on a second set of electrical properties associated with the generator in response to the transient event being present, wherein the second set of electrical properties comprises an inertia on the shaft in the generator, an accelerating power associated with a rotor of a turbine, and a power output by the generator, and wherein the mechanical power comprises an indication of energy used to rotate the shaft; and
sending the mechanical power to a controller associated with the turbine configured to couple to the generator, wherein the controller is configured to adjust one or more operations of the turbine based on the mechanical power.

10. The method of claim 9 , wherein the one or more operations comprise air and fuel ratio of the turbine, a Dry Low NOx (DLN) mode of the turbine, an operation of one or more nozzles used for combustion within the turbine, or any combination thereof.

11. The method of claim 9 , wherein the first set of electrical properties comprise a frequency associated with the electrical grid, active power associated with the generator, reactive power associated with the generator, voltage associated with the electrical grid, current associated with the electrical grid, power associated with the electrical grid, a power factor associated with the electrical grid, or any combination thereof.

12. The method of claim 9 , wherein the mechanical power is determined according to:

Pm
=

d
dt

⁡

[

∫

Pm
-
Pe

H

⁢
dt

]

×
2
⁢

⁢
H

+
Pe

wherein Pm is the mechanical power, H is the inertia on the shaft, and Pe is the power output by the generator.

13. The method of claim 9 , wherein the transient event is determined to be present on the electrical grid when a frequency, voltage, current, power, or power factor associated with the electrical grid increases or decreases more than a threshold.

14. A non-transitory computer readable medium comprising computer-executable instructions configured to cause a processor to:
monitor a first set of electrical properties associated with an electrical grid configured to couple to a generator;
determine whether a transient event is present on the electrical grid based on the first set of electrical properties

Assignees

• Gen Electric

Inventors

• Desabhatla Sreedhar
• Szepek Scott William
• Sesmat Alexis
• Buquet Maxime

Classifications

• H02J3/00142 Primary

  Oscillations concerning frequency · CPC title

• F05D2270/05

  to affect the output of the engine · CPC title

• H02J3/24

  Electricity · mapped topic

• H02K7/1823

  structurally associated with turbines or similar engines · CPC title

• F05D2220/762

  of the direct current (D.C.) type · CPC title