Calculating electric power noise distributions

Patent metadata

Field	Value
Publication number	US-12055576-B2
Application number	US-202217929101-A
Country	US
Kind code	B2
Filing date	Sep 1, 2022
Priority date	Sep 1, 2022
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

Abstract

The present disclosure relates to systems and methods for calculating noise distributions in an electric power system. In one embodiment, a system to calculate a noise distribution in an electric power system may comprise a measurement subsystem to obtain a plurality of raw measurements of a parameter in the electric power system. A noise distribution determination subsystem may be configured to generate a plurality of scaled raw measurements from the plurality of raw measurements, generate a power spectrum density from the plurality of scaled raw measurements, generate a cumulative distribution from the power spectrum density, and determine a noise distribution from the power spectrum density. A protective action subsystem may monitor the parameter in the electric power system to identify a signal of interest by utilizing, at least in part, the noise distribution and generating a control action in response to the signal.

First claim

What is claimed is:

1. A system to calculate a noise distribution in an electric power system, comprising:
a measurement subsystem to obtain a plurality of raw measurements of a parameter in the electric power system;
a noise distribution determination subsystem configured to:
generate a plurality of scaled raw measurements from the plurality of raw measurements;
generate a power spectrum density from the plurality of scaled raw measurements;
generate a cumulative distribution from the power spectrum density; and
determine a noise distribution from the power spectrum density; and

a protective action subsystem to:
monitor the parameter in the electric power system to identify a signal of interest by utilizing, at least in part, the noise distribution; and
generate a control action in response to the signal.

2. The system of claim 1 , wherein the noise distribution comprises a representation of an amount of energy below a plurality of percentiles.

3. The system of claim 1 , wherein the protective action subsystem is further configured to detect the signal by determining a probability of the signal representing noise is less than a threshold.

4. The system of claim 1 , wherein the noise distribution determination subsystem is further configured to generate the cumulative distribution between a minimum frequency and a maximum frequency.

5. The system of claim 4 , wherein the minimum frequency and the maximum frequency comprise a range of at least 100,000 Hz.

6. The system of claim 1 , further comprising a sensor component configured to obtain the plurality of raw measurements.

7. The system of claim 1 , wherein the plurality of raw measurements is sampled at a rate of about 1,000,000 samples per second or greater.

8. The system of claim 1 , wherein the plurality of raw measurements comprises variations attributable to daily fluctuations in the electric power system.

9. The system of claim 1 , wherein the plurality of raw measurements comprises variations attributable to at least weekly fluctuations in the electric power system.

10. The system of claim 1 , wherein the plurality of raw measurements comprises variations attributable to seasonal fluctuations in the electric power system.

11. A method for calculating a noise distribution in an electric power system, comprising:
obtaining a plurality of raw measurements of a parameter in the electric power system;
generating a plurality of scaled raw measurements from the plurality of raw measurements;
generating a power spectrum density from the plurality of scaled raw measurements;
generating a cumulative distribution from the power spectrum density;
determining a noise distribution from the power spectrum density;
monitoring the parameter in the electric power system;
identifying a signal of interest by utilizing, at least in part, the noise distribution; and
generating a control action in response to the signal.

12. The method of claim 11 , wherein the noise distribution comprises a representation of an amount of energy below a plurality of percentiles.

13. The method of claim 11 , wherein using the noise distribution in connection with a monitoring system to detect the signal comprises determining a probability of the signal representing noise is less than a threshold.

14. The method of claim 11 , further comprising generating the cumulative distribution between a minimum frequency and a maximum frequency.

15. The method of claim 14 , wherein the minimum frequency and the maximum frequency comprise a range of at least 100,000 Hz.

16. The method of claim 11 , further comprising obtaining the plurality of raw measurements using a sensor component.

17. The method of claim 11 , wherein the plurality of raw measurements is sampled at a rate of about 1,000,000 samples per second or greater.

18. The method of claim 11 , wherein the plurality of raw measurements comprises variations attributable to daily fluctuations in the electric power system.

19. The method of claim 11 , wherein the plurality of raw measurements comprises variations attributable to at least weekly fluctuations in the electric power system.

20. The method of claim 11 , wherein the plurality of raw measurements comprises variations attributable to seasonal fluctuations in the electric power system.

Assignees

• Schweitzer Engineering Lab Inc

Inventors

• Tews Cody W
• Seeley Nicholas C

Classifications

• H02H1/0007

  concerning the detecting means (in general G01R or other subclasses of G01; reed switches H01H71/2445) · CPC title

• H02H1/0061

  concerning transmission of signals (transmission of measured quantities or switching orders; sectionalised protection involving signal transmission between at least two stations H02H7/261; comparison of the voltage or current values at two spaced portions of a single system H02H3/28; transferring the output of a sensing member to another variable G01D5/00; electrical measuring arrangements using modulation of electromagnetic waves, e.g. light beams G01R15/24, G01R15/26) · CPC title

• H02H3/52

  responsive to the appearance of harmonics · CPC title

• G01R29/26

  Measuring noise figure; Measuring signal-to-noise ratio · CPC title

• G01R31/086 Primary

  in power transmission or distribution networks, i.e. with interconnected conductors · CPC title