System including a microturbine and a high-frequency alternator generating backup power for a telecommunications system

• US 20080197705A1
• Filed: 02/20/2007
• Published: 08/21/2008
• Est. Priority Date: 02/20/2007
• Status: Abandoned Application

• Current Assignee: Capstone Turbine Corp.
• Original Assignee: Capstone Turbine Corp.
• Inventors: Dewis, David W., Wang, Quincy Q.
• Application Number:
  US11/708,203
• Publication Number:
  US 20080197705A1
• Time in Patent Office: Days
• US Class Current: 307/65
• CPC Class Codes: H02J 9/08 requiring starting of a prime-mover

Abstract

A system includes an electrical load formed by a number of circuits within a system performing telecommunication functions, primary and backup sources of electrical power, and a relay that switches an input to the electrical load from the primary source to the backup source in response to determining that a failure has occurred within the primary source. The backup source includes a microturbine driving a six-phase, high-frequency alternator, which is turned on in response to determining that such a failure has occurred, and, preferably, a battery array that provides backup power when adequate power is not available from the alternator driven by the microturbine.

Claims

1. A system comprising:

an electrical load comprising circuits performing telecommunications functions;

a primary source of electrical power, providing direct current to the electrical load;

a first voltage sensing circuit determining when a failure of the primary source occurs;

a backup source of electrical power, providing direct current, including a microturbine power generating system, wherein the microturbine power generating system includes a microturbine, an alternator driven by the microturbine, and a rectifier,

a first relay, switching the electrical load from the primary source to the backup source in response to a determination within the first voltage sensing circuit that a failure of the primary source has occurred.

2. The system of claim 1, wherein

the voltage sensing circuit additionally determines when power from the primary source has been restored following a failure of the primary source, and

the first relay switches the electrical load from the backup source to the primary source in response to a determination that power from the primary source has been restored.

3. The system of claim 1, wherein the backup source additionally comprises:

a battery array;

a second voltage sensing circuit determining when adequate electrical power is being developed within the microturbine power generating system;

a second relay, switching the backup source to the microturbine power generating system in response to a determination within the second voltage sensing circuit that adequate electrical power is being developed within the microturbine power generating system and switching the backup source of electrical power to the battery array in response to a determination within that adequate electrical power is not being developed within the microturbine power generating system.

4. The system of claim 1, wherein the primary source is connected to power lines from an electrical utility.

5. The system of claim 1, wherein the alternator is a high-frequency six-phase device.

6. The system of claim 5, wherein the microturbine electrical power generating system additionally comprises a six-phase transformer connected between the alternator and the rectifier.

7. The system of claim 6, wherein the six-phase transformer includes primary windings arranged in a pair of three-phase delta configurations and secondary windings arranged in a pair of three-phase wye configurations.

8. The system of claim 5, wherein the alternator produces alternating current having a frequency of approximately 2.267 kHz.

9. A method for providing backup power for an electrical load, wherein the electrical load includes circuits performing telecommunications functions, and wherein the method comprises:

determining that a failure has occurred within a primary source of electrical power for the electrical load,

switching an input to the electrical load from the primary source to a backup source of electrical power for the electrical load, wherein the input is automatically switched in response to determining that the failure has occurred within the primary source of electrical power; and

starting a microturbine attached to an alternator within a microturbine electrical power generating system to provide electrical power for the backup source of electrical power, wherein the microturbine is automatically started in response to determining that the failure has occurred within the primary source of electrical power.

10. The method of claim 9, additionally comprising:

determining whether the microturbine power generating system is producing adequate electrical power; and

automatically switching the backup source of electrical power between the microturbine electrical power generating system, wherein the backup source of electrical power is switched to the microturbine power generating system in response to a determination that the microturbine power generating system is producing adequate electrical power, and wherein the backup source of electrical power is switched to a battery array in response to a determination that the microturbine power generating is not producing adequate electrical power.

11. The method of claim 9, additionally comprising:

determining, during operation of the electrical load with power from the backup source of electrical power, whether power from the primary source of electrical power has been restored, and

automatically switching the input to the electrical load from the backup source of electrical power to the primary source in response to determining that power from the primary source of electrical power has been restored.

12. The method of claim 9, wherein wherein the primary source of electrical power is connected to power lines from an electrical utility.

13. The method of claim 9, wherein the alternator is a high-frequency six-phase device.

14. The method of claim 13, wherein the microturbine electrical power generating system additionally comprises a six-phase transformer connected between the alternator and the rectifier.

15. The method of claim 14, wherein the six-phase transformer includes primary windings arranged in a pair of three-phase delta configurations and secondary windings arranged in a pair of three-phase wye configurations.

16. The method of claim 15, wherein the alternator produces alternating current having a frequency of approximately 2.267 kHz.

17. A backup power system for providing backup electrical power for an electrical load comprising circuits performing telecommunication functions, wherein the backup power system comprises a microturbine power generating system including:

a microturbine;

an alternator driven by the microturbine; and

a rectifier.

18. The backup power system of claim 17, additionally comprising:

a battery array;

a relay switching a source of backup power between the microturbine power generating system and the battery array;

a circuit determining whether the microturbine power generating system is producing adequate electrical power; and

a circuit automatically switching the relay, wherein the backup source of electrical power is switched to the microturbine power generating system in response to a determination that the microturbine power generating system is producing adequate electrical power, and wherein the backup source of electrical power is switched to a battery array in response to a determination that the microturbine power generating is not producing adequate electrical power.

19. The backup power system of claim 17, wherein the alternator is a high-frequency six-phase device.

20. The backup power system of claim 19, wherein the microturbine electrical power generating system additionally comprises a six-phase transformer connected between the alternator and the rectifier.