Control of a gas turbine driving a generator of an electrical system based on faults detected in the electrical system

Patent metadata

Field	Value
Publication number	US-11035300-B2
Application number	US-201916370093-A
Country	US
Kind code	B2
Filing date	Mar 29, 2019
Priority date	Mar 29, 2019
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

An example system includes a gas-turbine configured to generate mechanical energy using fuel; an electrical generator configured to generate electrical energy using the mechanical energy generated by the gas-turbine; an electrical converter configured to process the electrical energy generated by the electrical generator; and a converter controller configured to reduce, responsive to detecting occurrence of a fault in the electrical generator or the electrical converter, an amount of fuel provided to the gas-turbine.

First claim

What is claimed is:

1. A system comprising:
a gas-turbine configured to generate mechanical energy using fuel that flows through a fuel valve;
an engine controller configured to control operation of the gas-turbine;
an electrical generator configured to generate alternating current (AC) electrical energy using the mechanical energy generated by the gas-turbine;
an electrical converter comprising a rectifier configured to convert the AC electrical energy generated by the electrical generator into direct current (DC) electrical energy; and
a converter controller that is different than the engine controller, the converter controller configured to reduce, responsive to detecting occurrence of a fault in the rectifier, an amount of fuel provided to the gas-turbine by at least outputting, without involvement of the engine controller, a signal directly to the fuel value that causes the fuel value to provide zero fuel to the gas-turbine.

2. The system of claim 1 , wherein, to output the signal, the converter controller is configured to output an electrical pulse to the fuel valve.

3. The system of claim 1 , wherein the converter controller is configured to:
monitor electrical characteristics of the rectifier; and
detect the occurrence of the fault responsive to determining that a level of at least one of the electrical characteristics satisfies a corresponding threshold level.

4. The system of claim 3 , wherein:
to monitor the electrical characteristics, the converter controller is configured to monitor an electrical current level of the rectifier,
to determine that at a level of at least one of the electrical characteristics satisfies a corresponding threshold level, the converter controller is configured to determine that the electrical current level of the rectifier is greater than a threshold electrical current level.

5. The system of claim 3 , wherein:
to monitor the electrical characteristics, the converter controller is configured to monitor a voltage level of the rectifier,
to determine that at a level of at least one of the electrical characteristics satisfies a corresponding threshold level, the converter controller is configured to determine that the voltage level of the rectifier is less than a minimum threshold voltage level or greater than a maximum threshold voltage level.

6. The system of claim 1 , wherein the converter controller is configured to one or more of:
detect occurrence of the fault responsive to detecting occurrence of an arc flash in the electrical converter;
detect occurrence of the fault responsive to detecting smoke in the electrical converter;
detect occurrence of the fault responsive to determining that a temperature of the electrical generator is greater than a generator temperature threshold;
detect occurrence of the fault responsive to determining that a temperature of the electrical converter is greater than a converter temperature threshold;
detect occurrence of the fault responsive to determining that a rate of change of the temperature of the electrical generator is greater than a generator temperature rate threshold;
detect occurrence of the fault responsive to determining that a rate of change of the temperature of the electrical converter is greater than a converter temperature rate threshold;
detect occurrence of the fault responsive to determining that one or more of vibration, acceleration, or shock loads of the electrical machine or electrical converter exceed a corresponding threshold; and
detect occurrence of the fault responsive to determining that a rate of change of a speed of a rotor of the electrical generator is more negative than a rotor deceleration threshold.

7. The system of claim 6 , wherein the converter controller is configured to:
monitor a frequency of the electrical energy generated by the electrical generator; and
determine the rate of change of the speed of a rotor based on the frequency of the electrical energy generated by the electrical generator.

8. The system of claim 1 , wherein the converter controller is further configured to modify operation of the converter in response to detecting the occurrence of the fault in the electrical converter.

9. The system of claim 1 , wherein the engine controller is a full authority digital engine control (FADEC) configured to control the gas-turbine.

10. The system of claim 1 , wherein, responsive to detecting the occurrence of the fault, the converter controller is further configured to one or more of:
cause a modification of a geometry of the gas-turbine;
cause a modification of a bleed valve of the gas-turbine; and
trigger application of a rotational brake of the gas-turbine.

11. A method comprising:
controlling, by a converter controller, operation of an electrical converter comprising a rectifier configured to convert alternating current (AC) electrical energy generated by an electrical generator from mechanical energy derived from a gas-turbine into direct current (DC) electrical energy, wherein the converter controller is different than an engine controller that controls operation of the gas-turbine;
detecting, by the converter controller, occurrence of a fault in the rectifier; and
responsive to detecting the occurrence of the fault, reducing, by the converter controller, an amount of fuel provided to the gas-turbine by at least outputting, without involvement of the engine controller, a signal directly to a fuel value that causes the value to provide zero fuel to the gas-turbine.

12. The method of claim 11 , wherein outputting the signal comprises outputting, by the converter controller, an electrical pulse to the fuel valve.

13. The method of claim 11 , further comprising:
monitoring electrical characteristics of the rectifier; and
detecting the occurrence of the fault responsive to determining that a level of at least one of the electrical characteristics satisfies a corresponding threshold level.

14. The method of claim 13 , wherein one or both of:
determining that at a level of at least one of the electrical characteristics satisfies a corresponding threshold level comprises determining that an electrical current level of the rectifier is greater than a threshold electrical current level; and
determining that at a level of at least one of the electrical characteristics satisfies a corresponding threshold level comprises determining that an electrical voltage level of the rectifier is less than a minimum threshold electrical voltage level or greater than a maximum electrical voltage level.

15. The method of claim 11 , further comprising one or more of:
detecting occurrence of the fault responsive to detecting occurrence of an arc flash in the electrical converter;
detecting occurrence of the fault responsive to detecting smoke in the electrical converter;
detecting occurrence of the fault responsive to determining that a temperature of the electrical generator is greater than a generator temperature threshold;
detecting occurrence of the fault responsive to determining that a temperature of the electrical converter is greater than a converter temperature threshold;
detecting occurrence of the fault responsive to determining that a rate of change of the temperature of the electrical generator is greater than a generator temperature rate threshold;
detecting occurrence of the fault responsive to determining that a rate of change of the temperature of the electrical converter is greater than a converter temperature rate threshold; and
detecting occurrence of the fault responsive to determining that a rate of change of a speed of a rotor of the electrical

Assignees

• Rolls Royce Corp

Inventors

• Smith Alan W

Classifications

• F05D2220/76

  an electrical generator · CPC title

• H02P2101/25

  for combustion engines · CPC title

• H02P9/04

  Control effected upon non-electric prime mover and dependent upon electric output value of the generator · CPC title

• F02C9/46 Primary

  Emergency fuel control · CPC title

• F02C9/00

  Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants (controlling air intakes F02C7/057; controlling turbines F01D; controlling compressors F04D27/00; controlling in general G05) · CPC title