System and method for cognitive alarm management for the power grid

• US 10,215,814 B2
• Filed: 08/30/2013
• Issued: 02/26/2019
• Est. Priority Date: 08/30/2013
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Basu, Chumki, Das, Kaushik, Hazra, Jagabondhu, Seetharamakrishnan, Devasenapathi P.
• Primary Examiner(s): Kuan, John
• Application Number:
  US14/015,426
• Publication Number:
  US 20150066435A1
• Time in Patent Office: 2,006 Days
• Field of Search: None
• CPC Class Codes: G01R 19/2513 Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
• CPC Class Codes: G01R 31/086 in power transmission or distribution networks, i.e. with interconnected conductors
• CPC Class Codes: G01R 31/40 Testing power supplies testing photovoltaic devices H02S50/10
• CPC Class Codes: H02H 1/0092 concerning the data processing means, e.g. expert systems, neural networks
• CPC Class Codes: H04Q 2209/60 for transmitting utility meters data, i.e. transmission of data from the reader of the utility meter
• CPC Class Codes: H04Q 2209/823 where the data is sent when the measured values exceed a threshold, e.g. sending an alarm
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
• CPC Class Codes: Y04S 10/52 Outage or fault management, e.g. fault detection or location

Abstract

Systems and methods for cognitive alarm management in a power grid are described. In one embodiment, sensor measurements are transformed to determine the state of a power grid. Given current state information relating to the power grid, various analyses of the alarms may be conducted to produce various rankings of the alarms (e.g., by severity, graph analyses, etc.). In an embodiment, using power flow analysis, an optimal ranking is identified from the rankings in which a causal alarm is prioritized for resolution. Given the resolution of the causal alarm, remaining alarms (either all or a sub-set) may be resolved without further action. Thus, an embodiment provides an appropriate ranking of alarm conditions in a power grid such that the optimal resolution of alarms may be achieved. Other variants and embodiments are broadly contemplated herein.

Claims

1. A method of cognitive alarm management, said method comprising:

utilizing at least one processor to execute computer code configured to perform the steps of;

receiving, from a plurality of sensors of a power grid, a plurality of sensor measurements;

transforming the plurality of sensor measurements into a state estimation of the power grid, the state estimation of the power grid including two or more alarms;

determining rankings of the two or more alarms, wherein the determining comprises identifying a historical alarm condition having a similarity to the state estimation of the power grid and ranking the two or more alarms based upon control actions resulting in a successful resolution of the historical alarm condition, wherein the determining comprises utilizing an alarm relationship graph that identifies a dynamic relationship between alarms and identifies dependencies between alarms;

simulating power flow resulting from resolution of the two or more alarms in rank-order, according to the rankings of the two or more alarms;

determining a final ranking of the two or more alarms based on said simulating;

wherein the final ranking of the two or more alarms identifies a causal alarm to be prioritized for resolution, wherein the causal alarm comprises an alarm that when resolved resolves at least one other of the two or more alarms;

generating a resolution plan based upon the final ranking, wherein the resolution plan comprises an order for resolving the two or more alarms and wherein the order prioritizes the causal alarm and results in the two or more alarms being resolved using a least number of control actions; and

causing execution of the least number of control actions in the order for resolving the two or more alarms to bring the power grid back to a normal and secure state.

2. The method according to claim 1, wherein:

the plurality of sensor measurements comprise voltage and current measurements; and

said transforming comprises converting the plurality of sensor measurements into predefined bands of measurements corresponding to alarm conditions.

3. The method of claim 1, wherein said determining of rankings comprises creating two or more rankings of alarms based on at least one of:

severity index calculations and graph analysis.

4. The method of claim 3, wherein the severity index calculations are used to rank alarms according to calculated severity.

5. The method of claim 3, wherein the graph analysis is used to rank alarms according to power grid topology.

6. The method of claim 1, wherein said simulating comprises estimating an effect on the power grid of resolving alarms according to different rankings contained in the rankings of the two or more alarms.

7. The method of claim 6, wherein said determining of a final ranking comprises identifying a ranking among the rankings of the two or more alarms that resolves the most alarms automatically.

8. The method of claim 7, wherein the final ranking of the two or more alarms includes the causal alarm to be prioritized for resolution as a highest ranked alarm.

9. The method of claim 1, comprising determining whether the state estimation of the power grid is similar to at least one of:

a previous state of the same power grid and a previous state of a different power grid.

10. The method of claim 9, comprising, in response to determining whether the state estimation of the power grid is similar to at least one of a previous state of the same power grid and a previous state of a different power grid, providing a ranking of the two or more alarms based on a similarity calculation.

11. A computer program product for cognitive alarm management, said computer program product comprising:

a non-transitory computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising;

computer readable program code configured to receive, from a plurality of sensors of a power grid, a plurality of sensor measurements;

computer readable program code configured to transform the plurality of sensor measurements into a state estimation of the power grid, the state estimation of the power grid including two or more alarms;

computer readable program code configured to determine rankings of the two or more alarms, wherein to determine comprises identifying a historical alarm condition having a similarity to the state estimation of the power grid and ranking the two or more alarms based upon control actions resulting in a successful resolution of the historical alarm condition, wherein the determining comprises utilizing an alarm relationship graph that identifies a dynamic relationship between alarms and identifies dependencies between alarms;

computer readable program code configured to simulate power flow resulting from resolution of the two or more alarms in rank-order according to the rankings of the two or more alarms;

computer readable program code configured to determine a final ranking of the two or more alarms based on the simulating;

wherein the final ranking of the two or more alarms identifies a causal alarm to be prioritized for resolution, wherein the causal alarm comprises an alarm that when resolved resolves at least one other of the two or more alarms;

computer readable program configured to generate a resolution plan based upon the final ranking, wherein the resolution plan comprises an order for resolving the two or more alarms and wherein the order prioritizes the causal alarm and results in the two or more alarms being resolved using a least number of control actions; and

computer readable program code configured to cause execution of the least number of control actions in the order for resolving the two or more alarms to bring the power grid back to a normal and secure state.

12. The computer program product according to claim 11, wherein:

the plurality of sensor measurements comprise voltage and current measurements, and

said computer readable program code is configured to convert the plurality of sensor measurements into predefined bands of measurements corresponding to alarm conditions.

13. The computer program product of claim 11, wherein said computer readable program code is configured to create two or more rankings of alarms based on at least one of severity index calculations and graph analysis.

14. The computer program product of claim 13, wherein the severity index calculations are used to rank alarms according to calculated severity.

15. The computer program product of claim 13, wherein the graph analysis is used to rank alarms according to power grid topology.

16. The computer program product of claim 11, wherein said computer readable program code is configured to estimate an effect on the power grid of resolving alarms according to different rankings contained in the rankings of the two or more alarms.

17. The computer program product of claim 16, wherein to determine a final ranking comprises identifying a ranking among the rankings of the two or more alarms that resolves the most alarms automatically.

18. The computer program product of claim 17, wherein the final ranking of the two or more alarms includes the causal alarm to be prioritized for resolution as a highest ranked alarm.

19. An apparatus for cognitive alarm management, said apparatus comprising:

at least one processor; and

a computer readable storage medium having computer readable program code embodied therewith and executable by the at least one processor, the computer readable program code comprising;

computer readable program code configured to receive, from a plurality of sensors of a power grid, a plurality of sensor measurements;

computer readable program code configured to transform the plurality of sensor measurements into a state estimation of the power grid, the state estimation of the power grid including two or more alarms;

computer readable program code configured to determine rankings of the two or more alarms, wherein to determine comprises identifying a historical alarm condition having a similarity to the state estimation of the power grid and ranking the two or more alarms based upon control actions resulting in a successful resolution of the historical alarm condition, wherein the determining comprises utilizing an alarm relationship graph that identifies a dynamic relationship between alarms and identifies dependencies between alarms;

computer readable program code configured to simulate power flow resulting from resolution of the two or more alarms in rank-order according to the rankings of the two or more alarms;

computer readable program code configured to determine a final ranking of the two or more alarms based on the simulating;

wherein the final ranking of the two or more alarms identifies a causal alarm to be prioritized for resolution, wherein the causal alarm comprises an alarm that when resolved resolves at least one other of the two or more alarms;

computer readable program configured to generate a resolution plan based upon the final ranking, wherein the resolution plan comprises an order for resolving the two or more alarms and wherein the order prioritizes the causal alarm and results in the two or more alarms being resolved using a least number of control action; and

computer readable program code configured to cause execution of the least number of control actions in the order for resolving the two or more alarms to bring the power grid back to a normal and secure state.

20. A method comprising:

utilizing at least one processor to execute computer code configured to perform the steps of;

receiving a plurality of power grid sensor measurements;

transforming the power grid sensor measurements into an estimation of two or more alarms;

ranking the two or more alarms based on at least one of severity index calculations and graph analysis, wherein the ranking comprises identifying a historical alarm condition having a similarity to the estimation of the two or more alarms and ranking the two or more alarms based upon control actions resulting in a successful resolution of the historical alarm condition, wherein the ranking comprises utilizing an alarm relationship graph that identifies a dynamic relationship between alarms and identifies dependencies between alarms;

conducting a power flow simulation relating to resolution of the two or more alarms in rank-order, based on the ranking the two or more alarms;

thereupon identifying a causal alarm, comprising an alarm that when resolved resolves at least one other of the two or more alarms, to be prioritized for resolution, wherein the identifying a causal alarm comprises determining a final ranking of the two or more alarms based upon the power flow simulation;

generating a resolution plan based upon the final ranking, wherein the resolution plan comprises an order for resolving the two or more alarms and wherein the order prioritizes the causal alarm and results in the two or more alarms being resolved using a least number of control actions; and

executing the least number of control actions in the order for resolving the two or more alarms to bring the power grid back to a normal and secure state.