System for supplying electrical power to a load and corresponding power supply method

Patent metadata

Field	Value
Publication number	US-9673741-B2
Application number	US-201514746930-A
Country	US
Kind code	B2
Filing date	Jun 23, 2015
Priority date	Jun 23, 2014
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

This system for supplying electrical power to a load includes an asynchronous generator including a cage rotor intended to be driven by motor means and a rectifier adapted to rectify the voltage delivered by the generator. The rectifier is a rectifier employing unidirectional electronic components. The power supply system further includes a reactive power source for magnetizing the asynchronous generator.

First claim

What is claimed is:

1. A system for supplying electrical power to a load, the system comprising:
an asynchronous generator comprising a cage rotor driven by a motor;
a rectifier connected to the asynchronous generator and configured to rectify the voltage delivered by the asynchronous generator, wherein the rectifier employs unidirectional electronic components; and
a reactive power source for magnetizing the asynchronous generator, the reactive power source shunt-connected between the asynchronous generator and the rectifier.

2. The system according to claim 1 , wherein the reactive power source comprises a variable reactive power source.

3. The system according to claim 2 , wherein the variable reactive power source is configured to control the output voltage of the rectifier.

4. The system according to claim 2 , wherein the variable reactive power source comprises a voltage inverter employing insulated gate bipolar transistors and at least one capacitor.

5. The system according to claim 2 , wherein the reactive power source further comprises a fixed reactive power source.

6. The system according to claim 5 , wherein the fixed reactive power source comprises an RLC circuit.

7. The system according to claim 5 , wherein the fixed reactive power source is configured to filter harmonic currents coming from the variable reactive power source.

8. The system according to claim 3 , wherein the reactive power source is configured to filter harmonic currents coming from the rectifier.

9. The system according to claim 1 , further comprising a circuit for gradually charging capacitors of the variable reactive power source associated with a set of switches for supplying electrical power to a DC voltage bus.

10. The system according to claim 1 , further comprising a set of filter capacitors connected to the output of the rectifier.

11. The system according to claim 1 , wherein the unidirectional electrical components are diodes or thyristors.

12. The system according to claim 1 , wherein the reactive power source comprises a variable reactive power source.

13. The system according to claim 12 , wherein the variable reactive power source is configured to control the output voltage of the rectifier.

14. The system according to claim 13 , wherein the variable reactive power source comprises a voltage inverter employing insulated gate bipolar transistors and at least one capacitor.

15. The system according to claim 14 , wherein the reactive power source further comprises a fixed reactive power source.

16. The system according to claim 12 , wherein the variable reactive power source comprises a voltage inverter employing insulated gate bipolar transistors and at least one capacitor.

17. The system according to claim 12 , wherein the reactive power source further comprises a fixed reactive power source.

18. A method of supplying electrical power to a load by an electrical power supply system comprising an asynchronous generator comprising a cage rotor driven by a motor connected to a rectifier employing unidirectional electronic components configured to rectify the voltage delivered by the asynchronous generator, and magnetizing the asynchronous generator by a reactive power source shunt-connected between the asynchronous generator and the rectifier.

19. The method according to claim 18 , wherein the reactive power source comprises a variable reactive power source comprising a voltage inverter, and the voltage inverter drives in rotation a shaft coupling the asynchronous generator and the motor up to a jogging speed of the asynchronous generator on starting or decelerating the electrical power supply system.

Assignees

• Ge Energy Power Conversion Technology Ltd

Inventors

• Fessler Eric
• Crouzet Gilbert-Philippe
• Leclere Loic

Classifications

• H02P9/08

  Control of generator circuit during starting or stopping of driving means, e.g. for initiating excitation · CPC title

• H02P9/46 Primary

  Control of asynchronous generator by variation of capacitor · CPC title