Power control system and method

• US 7,635,922 B2
• Filed: 04/03/2006
• Issued: 12/22/2009
• Est. Priority Date: 04/03/2006
• Status: Active Grant

• Current Assignee: C.E. Niehoff & Co.
• Original Assignee: C.E. Niehoff & Co.
• Inventors: Becker, James
• Primary Examiner(s): GONZALEZ, JULIO CESAR
• Application Number:
  US11/397,523
• Publication Number:
  US 20070228735A1
• Time in Patent Office: 1,359 Days
• Field of Search: 290/40.C, 290/40.R, 290/40.B, 322/8, 322/29
• US Class Current: 290/40.00C
• CPC Class Codes: F02D 29/06 peculiar to engines driving electric generators
• CPC Class Codes: H02P 2101/30 for aircraft
• CPC Class Codes: H02P 29/0016 Control of angular speed of one shaft without controlling the prime mover
• CPC Class Codes: H02P 9/102 for limiting effects of transients
• CPC Class Codes: H02P 9/26 using discharge tubes or semiconductor devices H02P9/34 takes precedence
• CPC Class Codes: H02P 9/30 using semiconductor devices

Abstract

This invention discloses a power control system comprising a prime mover and a generator driven by the prime mover. A control device is coupled with the generator to ascertain a change in speed of the generator and vary an output power of the generator according to the change. The control device applies a signal to reduce the generator output power and another signal to restore the generator output power. The power control system may include a transmission, a speed converter, and/or an accessory.

Claims

1. A power control system, comprising:

(a) a generator coupled with one or more electrical loads, said generator comprising;

(i) a generator output power controller capable of manipulating an output power of the generator;

(ii) a generator speed indicator capable of generating a signal indicative of the generator speed;

(b) a prime mover coupled with the generator and operative to drive the generator; and

(c) a control device coupled with the generator speed indicator and output power controller;

wherein said control device is configured to ascertain a rate of change in speed of the generator, via the generator speed indicator, and to vary the output power of the generator, via the generator output power controller, according to said rate of change regardless of electrical power required by the one or more electrical loads.

2. The system of claim 1, wherein the generator comprises at least one of a brushless alternator and a permanent magnet alternator.

3. The system of claim 1, wherein the generator output power controller comprises at least one of a voltage regulator, a field coil, a silicon controlled rectifier, and a metal oxide semiconductor field effect transistor.

4. The system of claim 1, wherein the generator speed indicator comprises at least one of a generator phase winding and a tachometer.

5. The system of claim 1, wherein the prime mover comprises at least one of an internal combustion engine, a turbine engine, an electrical motor, a hydraulic motor, and a pneumatic motor.

6. The system of claim 1, wherein the control device is configured to at least one of reduce and restore the generator output power when the rate of change is above a threshold value.

7. The system of claim 6, wherein the control device is configured to reduce the generator output power when an algebraic sign of the rate of change is negative.

8. The system of claim 7, wherein said reduction is in proportion to the rate of change.

9. The system of claim 8, wherein said proportionality is obtained from a look up table.

10. system of claim 8, wherein said proportionality is obtained from a functional relationship.

11. The system of claim 6, wherein the control device is configured to restore the generator output power when an algebraic sign of the rate of change is positive.

12. system of claim 1, wherein the control device further comprises a voltage regulator capable of maintaining an output voltage of the generator substantially at a regulation voltage.

13. The system of claim 1, wherein the control device further comprises a voltage regulator capable of maintaining an output voltage of the generator substantially at a regulation voltage and wherein the regulation voltage is varied according to said rate of change.

14. The system of claim 13, wherein the control device is configured to at least one of reduce and restore the regulation voltage when the rate of change is above a threshold value.

15. The system of claim 14, wherein the control device is configured to reduce the regulation voltage when the algebraic sign of the rate of change is negative.

16. The system of claim 14, wherein the control device is configured to restore the regulation voltage when the algebraic sign of the rate of change is positive.

17. system of claim 1, further comprising means for communicating system information.

18. A power control system, comprising:

(a) a generator coupled with one or more electrical loads, said generator comprising;

(i) a shaft driven at a speed;

(ii) a generator output power controller capable of manipulating an output power of the generator;

(iii) a generator speed indicator capable of generating a signal indicative of the generator speed; and

(b) a control device coupled with the generator speed indicator and output power controller;

wherein said control device is configured to ascertain a rate of change in speed of the generator, via the generator speed indicator, and to vary the output power of the generator, via the generator output power controller, according to said rate of change regardless of electrical power required by the one or more electrical loads.

19. A method for controlling a power control system, said power control system comprising a prime mover coupled with a generator and operative to drive the generator, said generator, coupled with one or more electrical loads, comprising a generator output power controller capable of manipulating an output power of the generator and a generator speed indicator capable of generating a signal indicative of the generator speed, said method comprising:

(a) ascertaining a rate of change in speed of the generator via the generator speed indicator; and

(b) varying the output power of the generator, via the generator output power controller, according to said rate of change regardless of electrical power required by the one or more electrical loads.

20. The method of claim 19, wherein the step of varying the output power comprises at least one of reducing and restoring the generator output power when the rate of change is above a threshold value.

21. The method of claim 20, wherein the step of varying the output power comprises reducing the generator output power when an algebraic sign of the rate of change is negative.

22. The method of claim 21, wherein said reduction is in proportion to the rate of change.

23. The method of claim 22, wherein said proportionality is obtained from a look up table.

24. The method of claim 22, wherein said proportionality is obtained from a functional relationship.

25. The method of claim 20, wherein the step of varying the output power comprises restoring the generator output power when an algebraic sign of the rate of change is positive.

26. The method of claim 19, further comprising maintaining an output voltage of the generator, via a voltage regulator, substantially at a regulation voltage.

27. The method of claim 19, further comprising maintaining an output voltage of the generator, via a voltage regulator, substantially at a regulation voltage and varying the regulation voltage according to said rate of change.

28. The method of claim 27, wherein the step of varying the regulation voltage comprises at least one of reducing and restoring the regulation voltage when the rate of change is above a threshold value.

29. The method of claim 28, wherein the step of varying the regulation voltage comprises reducing the regulation voltage when the algebraic sign of the rate of change is negative.

30. The method of claim 28, wherein the step of varying the regulation voltage comprises restoring the regulation voltage when the algebraic sign of the rate of change is positive.

31. The method of claim 19, further comprising communicating system information.

32. A method for controlling a power control system, said power control system comprising a generator, said generator, coupled with one or more electrical loads, comprising a shaft driven at a speed, a generator output power controller capable of manipulating an output power of the generator, and a generator speed indicator capable of generating a signal indicative of the generator speed, said method comprising:

(a) ascertaining a rate of change in speed of the generator via the generator speed indicator; and

(b) varying the output power of the generator, via the generator output power controller, according to said rate of change regardless of electrical power required by the one or more electrical loads.