Active damper for DC generation systems

• US 6,697,270 B1
• Filed: 09/05/2002
• Issued: 02/24/2004
• Est. Priority Date: 09/05/2002
• Status: Expired due to Fees

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Huggett, Colin, Kalman, Gabor
• Primary Examiner(s): Berhane, Adolf D.
• Application Number:
  US10/236,900
• Time in Patent Office: 537 Days
• Field of Search: 323/205, 323/207, 363/40, 363/41, 363/51, 363/39, 363/131
• US Class Current: 363/51
• CPC Class Codes: H02J 1/02 Arrangements for reducing harmonics or ripples
• CPC Class Codes: H02J 3/02 using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
• CPC Class Codes: H02M 7/4815 Resonant converters H02M7/4811 and H02M7/4826 take precedence
• CPC Class Codes: H02M 7/53871 with automatic control of output voltage or current
• CPC Class Codes: H02M 7/53876 based on synthesising a desired voltage vector via the selection of appropriate fundamental voltage vectors, and corresponding dwelling times
• CPC Class Codes: H02P 2101/30 for aircraft
• CPC Class Codes: H02P 9/102 for limiting effects of transients
• CPC Class Codes: H02P 9/40 by variation of reluctance of magnetic circuit of generator
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

An electrical power system includes a switched reluctance machine/inverter adapted for providing DC power to a load; a voltage controller, which provides a control angle θ_C to the switched reluctance machine/inverter; an extraction module having an interface to the DC power and providing a resonant frequency content in Park vector format of a resonant frequency content at the interface; a phase locked loop, which provides a transformation angle θ from the resonant frequency content in Park vector format; a resonant frequency voltage controller, which uses the resonant frequency content in Park vector format and the transformation angle θ to provide a control angle Δθ to the switched reluctance machine/inverter so that the control angle θ_C and the control angle Δθ can be used to regulate the DC power and the resonant frequency content is attenuated in regulating the DC power.

Claims

1. An electrical power system comprising:

a switched reluctance machine/inverter adapted for providing DC power to a load;

a voltage controller configured to provide a control angle θ

_C to said switched reluctance machine/inverter;

an extraction module having an interface to said DC power, said extraction module providing a resonant frequency content in Park vector format of a resonant frequency content at said interface;

a phase locked loop configured to provide a transformation angle θ

from said resonant frequency content in Park vector format;

a resonant frequency voltage controller configured to use said resonant frequency content in Park vector format and said transformation angle θ

to provide a control angle Δ

θ

to said switched reluctance machine/inverter, whereby said control angle θ

_C and said control angle Δ

θ

are used to regulate said DC power and whereby said resonant frequency content is attenuated in regulating said DC power.

2. The electrical power system of claim 1, further comprising a real part extractor for providing the real part of said control angle Δ

θ

.

3. The electrical power system of claim 1, further comprising a real part summer, wherein said resonant frequency content in Park vector format is formed as a positive sequence signal and a negative sequence signal and resonant frequency voltage controller output from said positive sequence signal is added by said summer to resonant frequency voltage controller output from said negative sequence signal for providing the real part of said control angle Δ

θ

.

4. The electrical power system of claim 1, further comprising a transport lag compensator configured to use a transport lag angle and an input from said resonant frequency voltage controller to provide said control angle Δ

θ

to said switched reluctance machine/inverter so as to regulate said DC power.

5. The electrical power system of claim 1, further comprising a decoupling module configured to assure that said resonant frequency content is not included in said control angle θ

_C provided by said voltage controller.

6. The electrical power system of claim 1, further comprising a turn-on angle module and a summer, wherein said control angle Δ

θ

is added to said control angle θ

_C by said summer to form a control angle θ

_T, said control angle θ

_T is input to said turn-on angle module, and said turn-on angle module uses said control angle θ

_T to control said switched reluctance machine/inverter.

7. The electrical power system of claim 1 wherein said extraction module comprises:

a high pass filter configured to pass said resonant frequency content at said interface and block lower frequencies; and

a Park vector module connected to said high pass filter and configured to provide said resonant frequency content in Park vector format.

8. The electrical power system of claim 1 wherein said resonant frequency voltage controller comprises:

a rotator configured to rotate said resonant frequency content in Park vector format by said transformation angle θ

to provide a signal referenced to a synchronous frame;

a PI-regulator configured to regulate said signal referenced to a synchronous frame against a zero-valued command signal; and

a second rotator configured to rotate an output signal of said PI-regulator by the negative of said transformation angle θ

to provide a signal referenced to a stationary frame.

9. The electrical power system of claim 8 wherein said transport lag compensator comprises a rotator configured to rotate said signal referenced to a stationary frame by a transport lag angle to provide said control angle Δ

θ

.

10. The electrical power system of claim 1 wherein said phase locked loop comprises:

a vector multiplier configured to multiply said resonant frequency content in Park vector format by a negative estimate of said transformation angle θ

in Park vector format to provide a synchronous frame signal;

a PI-regulator configured to regulate said synchronous frame signal against a zero-valued command signal to provide an estimated angular speed; and

an integrator configured to integrate said estimated angular speed so as to provide said transformation angle θ

to said resonant frequency voltage controller and to provide said negative estimate of said transformation angle θ

to said vector multiplier.

11. An electrical power system comprising:

a switched reluctance machine/inverter adapted for providing DC power to a load;

a voltage controller configured to provide a control angle θ

_C to said switched reluctance machine/inverter;

an extraction module having an interface to said DC power, said extraction module providing a resonant frequency content in Park vector format of a resonant frequency content at said interface;

a phase locked loop configured to provide a transformation angle θ

from said resonant frequency content in Park vector format;

a resonant frequency voltage controller configured to use said resonant frequency content in Park vector format and said transformation angle θ

to provide a control angle Δ

θ

;

a decoupling module configured to assure that said resonant frequency content is not included in said control angle θ

_C provided by said voltage controller;

a real part extractor configured to provide the real part of said control angle Δ

θ

to said switched reluctance machine/inverter, so as to regulate said DC power and whereby said resonant frequency content is attenuated in regulating said DC power.

12. The electrical power system of claim 11, further comprising a transport lag compensator configured to use a transport lag angle and an input from said resonant frequency voltage controller to provide said control angle Δ

θ

to said switched reluctance machine/inverter so as to regulate said DC power.

13. The electrical power system of claim 11, further comprising a turn-on angle module and a summer, wherein said control angle Δ

θ

is added to said control angle θ

_C by said summer to form a control angle θ

_T, said control angle θ

_T is input to said turn-on angle module, and said turn-on angle module uses said control angle θ

_T to control said switched reluctance machine/inverter.

14. The electrical power system of claim 11 wherein said extraction module comprises:

a high pass filter configured to pass said resonant frequency content at said interface and block lower frequencies; and

a Park vector module connected to said high pass filter and configured to provide said resonant frequency content in Park vector format.

15. The electrical power system of claim 11 wherein said resonant frequency voltage controller comprises:

a rotator configured to rotate said resonant frequency content in Park vector format by said transformation angle θ

to provide a signal referenced to a synchronous frame;

a PI-regulator configured to regulate said signal referenced to a synchronous frame against a zero-valued command signal; and

a second rotator configured to rotate an output signal of said PI-regulator by the negative of said transformation angle θ

to provide a signal referenced to a stationary frame.

16. The electrical power system of claim 15 wherein said transport lag compensator comprises a rotator configured to rotate said signal referenced to a stationary frame by a transport lag angle to provide said control angle Δ

θ

.

17. The electrical power system of claim 11 wherein said phase locked loop includes

a vector multiplier configured to multiply said resonant frequency content in Park vector format by a negative estimate of said transformation angle θ

in Park vector format to provide a synchronous frame signal;

a PI-regulator configured to regulate said synchronous frame signal against a zero-valued command signal to provide an estimated angular speed; and

an integrator configured to integrate said estimated angular speed so as to provide said transformation angle θ

to said resonant frequency voltage controller and to provide said negative estimate of said transformation angle θ

to said vector multiplier.

18. An electrical power system comprising:

a switched reluctance machine/inverter adapted for providing DC power to a load;

a voltage controller configured to provide a control angle θ

_C;

an extraction module having an interface to said DC power, said extraction module providing a resonant frequency content in Park vector format of a resonant frequency content at said interface, wherein said extraction module comprises;

a high pass filter configured to pass said resonant frequency content at said interface and block lower frequencies; and

a Park vector module connected to said high pass filter and configured to provide said resonant frequency content in Park vector format;

a phase locked loop configured to provide a transformation angle θ

from said resonant frequency content in Park vector format, wherein said phase locked loop comprises;

a vector multiplier configured to multiply said resonant frequency content in Park vector format by a negative estimate of said transformation angle θ

in Park vector format to provide a synchronous frame signal;

a PI-regulator configured to regulate said synchronous frame signal against a zero-valued command signal to provide an estimated angular speed; and

an integrator configured to integrate said estimated angular speed so as to provide said transformation angle θ

to said resonant frequency voltage controller and to provide said negative estimate of said transformation angle θ

to said vector multiplier;

a resonant frequency voltage controller configured to use said resonant frequency content in Park vector format and said transformation angle θ

to provide a signal referenced to a stationary frame, wherein said resonant frequency voltage controller comprises;

a rotator configured to rotate said resonant frequency content in Park vector format by said transformation angle θ

to provide a signal referenced to a synchronous frame;

a PI-regulator configured to regulate said signal referenced to a synchronous frame against a zero-valued command signal; and

a second rotator configured to rotate an output signal of said PI-regulator by the negative of said transformation angle θ

to provide said signal referenced to a stationary frame;

a decoupling module configured to assure that said resonant frequency content is not included in said control angle θ

_C provided by said voltage controller;

a transport lag compensator configured to use a transport lag angle and said signal referenced to a stationary frame from said resonant frequency voltage controller to provide a control angle Δ

θ

, wherein said transport lag compensator comprises a transport lag rotator configured to rotate said signal referenced to a stationary frame by said transport lag angle to provide said control angle Δ

θ

;

a real part extractor configured to provide the real part of said control angle Δ

θ

;

a turn-on angle module and a summer, wherein the real part of said control angle Δ

θ

is added to the real part of said control angle θ

_C by said summer to form a control angle θ

_T and said control angle θ

_T is input to said turn-on angle module and said turn-on angle module uses said control angle θ

_T to control said switched reluctance machine/inverter, so as to regulate said DC power and whereby said resonant frequency content is attenuated in regulating said DC power.

19. A method for power distribution comprising steps of:

supplying electrical power from a switched reluctance machine/inverter adapted for providing DC power to a load;

providing a control angle θ

_C for controlling said switched reluctance machine/inverter;

extracting a resonant frequency content from said DC power;

providing a resonant frequency content in Park vector format from said resonant frequency content;

tracking and providing a transformation angle θ

from said resonant frequency content in Park vector format;

using said resonant frequency content in Park vector format and said transformation angle θ

to provide a signal referenced to a stationary frame;

decoupling said resonant frequency content from said control angle θ

_C;

using a transport lag angle and said signal referenced to a stationary frame to provide a control angle Δ

θ

;

extracting the real part of said control angle Δ

θ

;

combining the real part of said control angle Δ

θ

with the real part of said control angle θ

_C to form a control angle θ

_T and using said control angle θ

_T to control said switched reluctance machine/inverter, so as to regulate said DC power and whereby said resonant frequency content is attenuated in regulating said DC power.

20. The method of claim 19 wherein said step of extracting a resonant frequency content from said DC power comprises using a high pass filter configured to pass said resonant frequency content and block lower frequencies.

21. The method of claim 19 wherein said step of providing a resonant frequency content in Park vector format comprises using a Park vector module connected to said high pass filter and configured to provide said resonant frequency content in Park vector format.

22. The method of claim 19 wherein said tracking step comprises using a phase locked loop, wherein said phase locked loop:

multiplies said resonant frequency content in Park vector format by a negative estimate of said transformation angle θ

in Park vector format to provide a synchronous frame signal,

uses a PI-regulator to regulate said synchronous frame signal against a zero-valued command signal to provide an estimated angular speed; and

integrates said estimated angular speed so as to provide said transformation angle θ and

so as to provide said negative estimate of said transformation angle θ

to be multiplied by said resonant frequency content in Park vector format for tracking said transformation angle θ

.

23. The method of claim 19 wherein said step of using said resonant frequency content in Park vector format and said transformation angle θ

to provide a signal referenced to a stationary frame comprises;

rotating said resonant frequency content in Park vector format by said transformation angle θ

to provide a signal referenced to a synchronous frame;

using a PI-regulator to regulate said signal referenced to a synchronous frame against a zero-valued command signal; and

rotating an output signal of said PI-regulator by the negative of said transformation angle θ

to provide said signal referenced to a stationary frame.

24. The method of claim 19 wherein said step of using a transport lag angle and said signal referenced to a stationary frame to provide a control angle Δ

θ

comprises rotating said signal referenced to a stationary frame by said transport lag angle to provide said control angle Δ

θ

.