Gas turbine engine and electrical system

Patent metadata

Field	Value
Publication number	US-10797628-B2
Application number	US-201715459577-A
Country	US
Kind code	B2
Filing date	Mar 15, 2017
Priority date	Mar 13, 2013
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A gas turbine engine includes first and second electrical machines coupled to the gas turbine engine, each of the first and second electrical machines electrically coupled to both a primary electrical bus and a secondary electrical bus. The gas turbine includes a first controller configured to control operation of the gas turbine engine, and a second controller coupled to the first controller, the second controller configured to respond to control inputs from the first controller and control an electrical output of the first and second electrical machines to the primary and secondary electrical busses. A converter controller is coupled to an energy storage system, the second controller, the primary electrical bus, and the secondary electrical bus.

First claim

What is claimed is:

1. A method of generating power in a gas turbine engine, comprising:
coupling a first electrical machine in parallel to both a primary electrical bus and to a secondary electrical bus via a first pair of inverter/converter controllers, the first pair of inverter/converter controllers comprising a first inverter/converter controller and a second inverter/converter controller, the first inverter/converter controller coupled to the primary electrical bus, the second inverter/converter controller coupled to the secondary electrical bus, the first electrical machine being coupled to the gas turbine engine;
coupling a second electrical machine in parallel to both the primary electrical bus and to the secondary electrical bus via a second pair of inverter/converter controllers, the second pair of inverter/converter controllers comprising a third inverter/converter controller and a fourth inverter/converter controller, the third inverter/converter controller coupled to the primary electrical bus,
the fourth inverter/converter controller coupled to the secondary electrical bus, the second electrical machine being coupled to the gas turbine engine;
configuring a first controller to receive data from the gas turbine engine to control operation of the gas turbine engine;
coupling a second controller to the first controller;
configuring the second controller to control an electrical output of the first and second electrical machines to the primary and secondary electrical busses;
coupling a converter controller to an energy storage system, the second controller, the primary electrical bus, and the secondary electrical bus; and
configuring the converter controller to control an amount of electrical power, under direction from the second controller, passing between the energy storage system and the primary and secondary electrical busses.

2. The method of claim 1 , further comprising coupling the first electrical machine to a high pressure spool of the gas turbine engine, and coupling the second electrical machine to a low pressure spool of the gas turbine engine.

3. The method of claim 2 , wherein the first electrical machine is one of a generator, an alternator, or a motor, and is in mechanical communication with the high pressure spool.

4. The method of claim 1 , wherein at least one of the first electrical machine or the second electrical machine is a starter/generator configured to selectively start the gas turbine engine.

5. The method of claim 4 , wherein each of the first and second electrical machines is a starter/generator, the first electrical machine being coupled to a high pressure spool of the gas turbine engine, and the second electrical machine being coupled to a low pressure spool of the gas turbine engine.

6. The method of claim 1 , wherein the second controller controls each of the first inverter/converter controller and the third inverter/converter controller to self-regulate and adapt power output of the first and second electrical machines to the primary electrical bus.

7. The method of claim 1 , wherein the second controller, the first electrical machine, the second electrical machine, the first inverter/converter controller, the second inverter/converter controller, the third inverter/converter controller, and the fourth inverter/converter controller are configured for variable power sharing.

8. The method of claim 1 , wherein the energy storage system is configured to absorb transient loads on the primary electrical bus and the secondary electrical bus.

9. An electrical system coupled to a gas turbine engine, and to a primary electrical bus and a secondary electrical bus, the electrical system comprising:
a first electrical machine and a second electrical machine, the first and second electrical machines coupled to the gas turbine engine, the first electrical machine electrically coupled in parallel to both the primary electrical bus and to the secondary electrical bus via a first pair of inverter/converter controllers, and the second electrical machine electrically coupled in parallel to both the primary electrical bus and to the secondary electrical bus via a second pair of inverter/converter controllers;
a first controller configured to control operation of the gas turbine engine;
a second controller coupled to the first controller, the second controller configured to respond to control inputs from the first controller and control an electrical output of the first and second electrical machines to the primary and secondary electrical busses;
an energy storage system; and
a converter controller coupled to the energy storage system, the second controller, the primary electrical bus, and the secondary electrical bus;
wherein the converter controller is configured to control an amount of electrical power, under direction from the second controller, passing between the energy storage system and at least one of the primary and secondary electrical busses,
wherein the first pair of inverter/converter controllers comprises a first inverter/converter controller and a second inverter/converter controller, the first inverter/converter controller coupled to the primary electrical bus, the second inverter/converter controller coupled to the secondary electrical bus, and
wherein the second pair of inverter/converter controllers comprises a third inverter/converter controller and a fourth inverter/converter controller, the third inverter/converter controller coupled to the primary electrical bus, the fourth inverter/converter controller coupled to the secondary electrical bus.

10. The electrical system of claim 9 , wherein:
the energy storage system is configured to absorb transient loads on the primary electrical bus and the secondary electrical bus, and the second controller, the first electrical machine, the second electrical machine, the first inverter/converter controller, the second inverter/converter controller, the third inverter/converter controller, and the fourth inverter/converter controller are configured for variable power sharing.

11. A gas turbine engine, comprising:
a low pressure spool;
a high pressure spool;
a first electrical machine and a second electrical machine, the first and second electrical machines being coupled to the gas turbine engine, each of the first and second electrical machines electrically coupled to both a primary electrical bus and a secondary electrical bus, the first electrical machine coupled in parallel to both the first primary electrical bus and to the secondary electrical bus via a first pair of inverter/converter controllers, and the second electrical machine coupled in parallel to both the primary electrical bus and to the secondary electrical bus via a second pair of inverter/converter controllers;
a first controller configured to control operation of the gas turbine engine;
a second controller coupled to the first controller, the second controller configured to respond to control inputs from the first controller and control an electrical output of the first and second electrical machines to the primary and secondary electrical busses; and
a converter controller coupled to an energy storage system, the second controller, the primary electrical bus, and the secondary electrical bus,
wherein the converter controller is configured to control an amount of electrical power passing between the energy storage system and at least one of the primary and secondary electrical busses in response to an input from the second controller,
wherein the first pair of inverter/converter controllers comprises a first inverter/converter controller and a second inverter/converter controller, the first inverter/converter controller coup

Assignees

• Rolls Royce Nam Tech Inc
• Rolls Royce Corp

Inventors

• French Mat
• Alt John T
• Blackwelder Mark J

Classifications

• H02J2105/32

  for aircrafts · CPC title

• H02P9/48 Primary

  Arrangements for obtaining a constant output value at varying speed of the generator, e.g. on vehicle (H02P9/04 - H02P9/46 take precedence) · CPC title

• F01D15/10 Primary

  Adaptations for driving, or combinations with, electric generators · CPC title

• H02J3/32

  using batteries or super capacitors with converting means · CPC title

• H02J3/30

  using dynamo-electric machines coupled to flywheels · CPC title