Apparatus and method for generating a power signal for a power system from signals genenrated by a communication device

• US 5,598,420 A
• Filed: 12/22/1995
• Issued: 01/28/1997
• Est. Priority Date: 10/08/1993
• Status: Expired due to Term

• Current Assignee: Carnelian Cordless LLC (Intellectual Ventures LLC)
• Original Assignee: ABB Power T&D Limited (ABB Limited)
• Inventors: Kaufman, Barry M.
• Primary Examiner(s): Beausoliel, Jr., Robert W.
• Assistant Examiner(s): Palys, Joseph E.
• Application Number:
  US08/577,063
• Time in Patent Office: 403 Days
• Field of Search: 371/20.1, 371/5.1, 371/62, 371/68.2, 375/224, 375/298, 375/222, 379/8, 358/406, 358/504
• US Class Current: 714/712
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 1/24 Testing correct operation

Abstract

Method and System for providing a gateway between a communications device and data receiving device which corrects a data signal produced by the communications device by reducing the data errors produced by the communications device by replacing the data signal with a guard signal when the error exceeds a bandwidth and by controlling the communications device so that it provides predictable propagation delays by resetting an adaptive component of the communications device to perform a major convergence and by setting the coefficients used by the adaptive component to predetermined initial values.

Claims

1. A method of generating a power signal for a power system from signals generated by a communications device, said method comprising the steps of:

a) determining error signals from the signals generated by the communications device;

b) determining, as a function of said error signals, whether said communications device is operating within an allowable error bandwidth of the power system; and

c) when the communications device is operating within the allowable error bandwidth, generating the power signal from the signals generated by the communications device and when the communications device is not operating within the allowable error bandwidth, generating the power signal from a guard signal where the power system ignores the power signal when it is generated from a guard signal.

2. A method according to claim 1, wherein step c) comprises:

replacing the data signal with the guard signal until said communications device has been operating within the allowable error bandwidth for a predetermined time interval.

3. A method according to claim 1, wherein the communications device is a modem.

4. A method according to claim 1, wherein the communications device has an adaptive component and said adaptive component has coefficients which may be set, further comprising the steps of:

d) determining whether said communications device has not been operating within the allowable error bandwidth for a first predetermined time interval;

e) determining, as a function of the signals generated by said communications device, whether said communications device has been receiving an input signal having at least a predetermined minimal energy from a communications channel; and

f) performing substeps f(i) to f(iii) if said communications device has not been operating within the allowable error bandwidth for the first predetermined time interval and said communications device has been receiving an input signal having at least the predetermined minimal energy;

(i) waiting a second predetermined time interval;

(ii) resetting the communications device to perform a major convergence of the adaptive component to model characteristics of the communications channel; and

(iii) setting the coefficients of the adaptive component to predetermined initial values.

5. A method according to claim 4, further comprising the step of:

performing substeps f(ii) to f(iii) if the communications device has not been operating within the allowable error bandwidth continuously for a third predetermined time interval after an earlier performance of substeps f(i) to f(iii).

6. A method according to claim 5, wherein step c) comprises:

replacing the data signal with the guard signal until said communications device has been operating within the allowable error bandwidth for a fourth predetermined time interval.

7. A method of generating a power signal for a power system from signals generated by a communications device, wherein said communications device has an adaptive component and said adaptive component has coefficients which may be set, said method comprising the steps of:

a) determining error signals from the signals generated by the communications device;

b) determining, as a function of said error signals, whether said communications device is operating within an allowable error bandwidth of the power system;

c) determining whether said communications device has not been operating within the allowable error bandwidth for a first predetermined time interval;

d) determining, as a function of the signals generated by said communications device, whether said communications device has been receiving an input signal having at least a predetermined minimal energy from a communications channel; and

e) performing substeps e(i) to e(iii) if said communications device has not been operating within the allowable error bandwidth for the first predetermined time interval and said communications device has been receiving an input signal having at least the predetermined minimal energy;

(i) waiting a second predetermined time interval;

(ii) resetting the communications device to perform a major convergence of the adaptive component to model characteristics of the communications channel; and

(iii) setting the coefficients of the adaptive component to predetermined initial values.

8. A method according to claim 7, further comprising the step of:

performing substeps e(ii) to e(iii) if the communications device has not been operating within the allowable error bandwidth continuously for a third predetermined time interval after an earlier performance of substeps e(i) to e(iii).

9. A system for generating a power signal for a power system from signals generated by a communications device, said system comprising:

means for determining error signals from the signals generated by the communications device;

means for determining, as a function of said error signals, whether said communications device is operating within an allowable error bandwidth of the power signal; and

generation means for generating the power signal from the signals generated by the communications device when the communications device is operating within the allowable error bandwidth, and when the communications device is not operating within the allowable error bandwidth, generating the power signal from a guard signal where the power system ignores the power signal when it is generated from a guard signal.

10. A system according to claim 9, wherein said replacement means comprises:

means for replacing the data signal with the guard signal until said communications device has been operating within the allowable error bandwidth for a predetermined time interval.

11. A system according to claim 9, wherein the communications device is a modem.

12. A system according to claim 9, wherein the communications device has an adaptive component, said adaptive component has coefficients which may be set, and said system further comprises:

means for determining whether said communications device has not been operating within the allowable error bandwidth for a first predetermined time interval;

means for determining, as a function of the signals generated by said communications device, whether said communications device has been receiving an input signal having at least a predetermined minimal energy from a communications channel; and

means for waiting a second predetermined time interval, resetting the communications device to perform a major convergence of the adaptive component to model characteristics of the communications channel, and setting the coefficients of the adaptive component to predetermined initial values if said communications device has not been operating within the allowable error bandwidth for the first predetermined time interval and said communications device has been receiving an input signal having at least the predetermined minimal energy.

13. A system according to claim 12, wherein said system further comprises:

means for resetting the communications device to perform a major convergence of the adaptive component to model characteristics of the communications channel and setting the coefficients of the adaptive component to predetermined initial values if the communications device has not been operating within the allowable error bandwidth continuously for a third predetermined time interval after waiting a second predetermined time interval, resetting the communications device to perform a major convergence of the adaptive component to model characteristics of the communications channel, and setting the coefficients of the adaptive component to predetermined initial values.

14. A system according to claim 13, wherein said replacement means comprises:

means for replacing the data signal with the guard signal until said communications device has been operating within the allowable error bandwidth for a fourth predetermined time interval.

15. A system for generating a power signal for a power system from signals generated by a communications device wherein said communications device has an adaptive component and said adaptive component has coefficients which may be set, said system comprising:

means for determining error signals from the signals generated by the communications device;

means for determining, as a function of said error signals, whether said communications device is operating within an allowable error bandwidth of the power system;

means for determining whether said communications device has not been operating within the allowable error bandwidth for a first predetermined time interval;

means for determining, as a function of the signals generated by said communications device, whether said communications device has been receiving an input signal having at least a predetermined minimal energy from a communications channel; and

means for waiting a second predetermined time interval, resetting the communications device to perform a major convergence of the adaptive component to model characteristics of the communications channel, and setting the coefficients of the adaptive component to predetermined initial values if said communications device has not been operating within the allowable error bandwidth for the first predetermined time interval and said communications device has been receiving an input signal having at least the predetermined minimal energy.

16. A system according to claim 15, wherein said system further comprises:

means for resetting the communications device to perform a major convergence of the adaptive component to model characteristics of the communications channel and setting the coefficients of the adaptive component to predetermined initial values if the communications device has not been operating within the allowable error bandwidth continuously for a third predetermined time interval after waiting a second predetermined time interval, resetting the communications device to perform a major convergence of the adaptive component to model characteristics of the communications channel, and setting the coefficients of the adaptive component to predetermined initial values.

17. A method of generating and providing a power signal for a power system, said method comprising the steps of:

a) receiving signals generated by a quadrature amplitude modulation ("QAM") modem, the signals including data signals;

b) determining error signals from the signals generated by the QAM modem;

c) determining, as a function of said error signals, whether the QAM modem is operating within an allowable error bandwidth for the power system;

d) generating the power signal from the data signals generated by the QAM modem when the QAM modem is operating within the allowable error bandwidth and generating the power signal from a guard signal when the QAM modem is not operating within the allowable error bandwidth where the power system ignores the power signal when it is generated from a guard signal; and

e) transmitting the power signal to the power system.

18. A method according to claim 17, wherein the power system is a substation and the data signals comprise power magnitude and power phase information.

19. A method according to claim 18, wherein step d) comprises:

generating the power signal from a guard signal until the QAM modem has been operating within the allowable error bandwidth for a predetermined time interval.

20. A method according to claim 17, wherein the QAM modem has an adaptive component and said adaptive component has coefficients which may be set, further comprising the steps of:

f) determining whether the QAM modem has not been operating within the allowable error bandwidth for a first predetermined time interval;

g) determining, as a function of the signals generated by the QAM modem, whether the QAM modem has been receiving an input signal having at least a predetermined minimal energy from a communications channel;

h) performing substeps h(i) to h(iii) if the QAM modem has not been operating within the allowable error bandwidth for the first predetermined time interval and the QAM modem has been receiving an input signal having at least the predetermined minimal energy;

(i) waiting a second predetermined time interval;

(ii) resetting the QAM modem to perform a major convergence of the adaptive component to model characteristics of the communications channel; and

(iii) setting the coefficients of the adaptive component to predetermined initial values; and

i) performing substeps h(ii) to h(iii) if the QAM modem has not been operating within the allowable error bandwidth continuously for a third predetermined time interval after an earlier performance of substeps h(i) to h(iii).

21. A method according to claim 20, wherein step d) comprises:

generating the power signal from a guard signal until the QAM modem has been operating within the allowable error bandwidth for a fourth predetermined time interval.

22. A system for generating and providing a power signal for a power system, said system comprising:

means for receiving signals generated by a quadrature amplitude modulation ("QAM") modem, the signals including data signals;

means for determining error signals from the signals generated by the QAM modem;

means for determining, as a function of said error signals, whether the QAM modem is operating within an allowable error bandwidth for the power system;

generation means for generating the power signal from the data signals generated by the QAM modem when the QAM modem is operating within the allowable error bandwidth and generating the power signal from a guard signal when the QAM modem is not operating within the allowable error bandwidth where the power system ignores the power signal when it is generated from a guard signal; and

means for transmitting the power signal to the power system.

23. A system according to claim 22, wherein the power system is a substation and the data signals comprise power magnitude and power phase information.

24. A system according to claim 23, wherein the generation means comprises:

means for generating the power signal from a guard signal until the QAM modem has been operating within the allowable error bandwidth for a predetermined time interval.

25. A system according to claim 24, wherein the QAM modem has an adaptive component and said adaptive component has coefficients which may be set, the system further comprising:

means for determining whether the QAM modem has not been operating within the allowable error bandwidth for a first predetermined time interval;

means for determining, as a function of the signals generated by the QAM modem, whether the QAM modem has been receiving an input signal having at least a predetermined minimal energy from a communications channel; and

means for waiting a second predetermined time interval, resetting the QAM modem to perform a major convergence of the adaptive component to model characteristics of the communications channel, and setting the coefficients of the adaptive component to predetermined initial values if the QAM modem has not been operating within the allowable error bandwidth for the first predetermined time interval and the QAM modem has been receiving an input signal having at least the predetermined minimal energy.

26. A system according to claim 25, further comprising:

means for resetting the QAM modem to perform a major convergence of the adaptive component to model characteristics of the communications channel, and setting the coefficients of the adaptive component to predetermined initial values if the QAM modem has not been operating within the allowable error bandwidth continuously for a third predetermined time interval after waiting a second predetermined time interval, resetting the QAM modem to perform a major convergence of the adaptive component to model characteristics of the communications channel, and setting the coefficients of the adaptive component to predetermined initial values.