Event analysis apparatus, event analysis systems, event analysis methods, and event analysis program

• US 10,496,655 B2
• Filed: 11/02/2016
• Issued: 12/03/2019
• Est. Priority Date: 11/06/2015
• Status: Active Grant

• Current Assignee: Yokogawa Electric Corporation
• Original Assignee: Yokogawa Electric Corporation
• Inventors: Liu, Zhuo, Sakuraba, Yuichi
• Primary Examiner(s): Nguyen, Phong H
• Application Number:
  US15/341,483
• Publication Number:
  US 20170132292A1
• Time in Patent Office: 1,126 Days
• Field of Search: 707737, 707754, 707758
• CPC Class Codes: G05B 19/0426 Programming the control sequence
• CPC Class Codes: G05B 2219/23026 Recognise user input pattern and present possible intended program
• CPC Class Codes: G05B 2219/23434 Select automatically prefered program data, ordered to most used program
• CPC Class Codes: G05B 23/0237 based on parallel systems, e.g. comparing signals produced at the same time by same type systems and detect faulty ones by noticing differences among their responses
• CPC Class Codes: G06F 11/3006 where the computing system is distributed, e.g. networked systems, clusters, multiprocessor systems multiprogramming arrangements G06F9/46; allocation of resources G06F9/50
• CPC Class Codes: G06F 11/302 where the computing system component is a software system
• CPC Class Codes: G06F 11/3476 Data logging G06F11/14, G06F11/2205 take precedence
• CPC Class Codes: G06F 16/2465 Query processing support for facilitating data mining operations in structured databases
• CPC Class Codes: G06F 7/08 Sorting, i.e. grouping record carriers in numerical or other ordered sequence according to the classification of at least some of the information they carry by merging two or more sets of carriers in ordered sequence G06F7/16

Abstract

An event analyzer includes: an event collector configured to collect event log data representing operation history which an DCS operator performed; a basic unit operation analyzer configured to analyze event log data, and extract basic unit operation data representing operation method based on the operation by the DCS operator; and an unit operation analyzer configured to analyze basic unit operation data, and extract unit operation data representing intention of the operation by the DCS operator.

Claims

1. An event analyzer for a distributed control system (DCS) that controls operations in a plant comprising:

at least one memory storing instructions, and

at least one processor configured to execute the instructions to;

collect event log data representing an operation history of operations performed by the DCS operator;

analyze the event log data, and extract basic unit operation data representing an operation method based on the operations performed by the DCS operator; and

analyze basic unit operation data, and extract unit operation data representing operational intentions of the operations by the DCS operator,

wherein the at least one processor is configured to execute the instructions to;

detect, based on the event log data, a successive operation period in which operations for changing a setting value of the identical type for a single control system are performed continuously in time;

analyze a trend representing transition of the setting value in the successive operation period;

determine the operation method based on a change amount of the setting value, and thereby extract the basic unit operation data;

analyze the trend to detect presence or absence of an inflection point representing a point where a changing direction of the setting value changes from increase to decrease or a point where a changing direction of the setting value changes from decrease to increase;

divide the successive operation period into a plurality of local periods as the inflection point is the partition in a case in which the inflection point exists in the successive operation period;

determine the operation method based on the change amount which is difference between a first point and a last point in each local period;

determine that the operation method is a ramping operation for increase in a case in which the change amount is positive and is larger than a threshold value;

perform sign inversion on the change amount in a case in which the change amount is negative, and determine that the operation method is a ramping operation for decrease in a case in which the sign inverted change amount is larger than a threshold value; and

determine that the operation method is fine-tuning in a case in which the operation method is not determined as the ramping operation for increase or the ramping operation for decrease.

2. The event analyzer according to claim 1, wherein

the at least one processor is configured to execute the instructions to:

collect a plurality of event log data arranged in time series;

extract one or more of basic unit operation data and analyze one or more of the event log data; and

analyze basic unit operation data extracted and extract unit operation data representing intention of the operation by the DCS operator.

3. The event analyzer according to claim 1, wherein

the at least one processor is configured to execute the instructions to:

determine the operation intention which means what kind of change the DCS operator gives to the process, and extract unit operation data based on rule which is based on domain knowledge.

4. The event analyzer according to claim 2, wherein

the at least one processor is configured to execute the instructions to:

determine the operation intention which means what kind of change the DCS operator gives to the process, and extract unit operation data based on rule which is based on domain knowledge.

5. The event analyzer according to claim 1, wherein

the at least one processor is configured to execute the instructions to:

output analysis result data representing the basic unit operation or the unit operation on time axis based on the basic unit operation data or the unit operation data.

6. The event analyzer according to claim 2, wherein

the at least one processor is configured to execute the instructions to:

output analysis result data representing the basic unit operation or the unit operation on time axis based on the basic unit operation data or the unit operation data.

7. The event analyzer according to claim 1, wherein

the at least one processor is configured to execute the instructions to:

output analysis result data representing the basic unit operation or the unit operation on time axis based on basic unit operation data or unit operation data, and

the event analyzer further comprises;

a display configured to display in a visual manner analysis data outputted.

8. The event analyzer according to claim 2, wherein

the at least one processor is configured to execute the instructions to:

output analysis result data representing the basic unit operation or the unit operation on time axis based on basic unit operation data or unit operation data, and

the event analyzer further comprises;

a display configured to display in a visual manner analysis data outputted.

9. The event analyzer according to claim 1, wherein

the at least one processor is configured to execute the instructions to:

analyze sequences of basic unit operation data or unit operation data, and extract an operation procedure for which the DCS operator performs an alarm response and a steady operation.

10. The event analyzer according to claim 1, wherein

the at least one processor is configured to execute the instructions to:

analyze sequences of basic unit operation data or unit operation data, and extract an operation procedure for which the DCS operator performs an alarm response and a steady operation, and

the event analyzer further comprises;

a speaker configured to announce in an auditory manner the operation procedure extracted.

11. An event analyzer according to claim 1, wherein

the at least one processor is configured to execute the instructions to:

output event log data indicating operation history which the DCS operator performed.

12. The event analyzer according to claim 1, wherein

the at least one processor is configured to execute the instructions to:

determine the operation method based on the change amount which is difference between a first point and a last point in the successive operation period in a case in which the inflection point does not exist in the successive operation period.

13. The event analyzer according to claim 1, wherein

the at least one processor is configured to execute the instructions to:

integrate the local periods in a case in which the local periods determined the fine-tuning are contiguous, and perform regression analysis in the integrated periods;

determine that the operation method is a ramping operation for increase in a case in which inclination of a regression line is equal to or larger than a threshold value;

determine that the operation method is a ramping operation for decrease in a case in which the inclination of the regression line is negative and is larger than a threshold value; and

determine that the operation method is fine-tuning in a case in which the operation method is not determined as the ramping operation for increase or the ramping operation for decrease.

14. An event analysis method for a distributed control system (DCS) that controls operations in a plant using a computer comprising:

collecting event log data representing operation history which the DCS operator performed;

analyzing event log data collected in the step of collecting the event and extracting basic unit operation data representing an operation method operated by the DCS operator; and

analyzing basic unit operation data and extracting unit operation data representing operation intention of the operation by the DCS operator,

wherein analyzing the event log data comprises;

detecting, based on the event log data, a successive operation period in which operations for changing a setting value of the identical type for a single control system are performed continuously in time; and

analyzing a trend representing transition of the setting value in the successive operation period;

wherein extracting the basic unit operation data comprises;

determining the operation method based on a change amount of the setting value, and thereby extracting the basic unit operation data;

wherein analyzing the trend comprises;

analyzing the trend to detect presence or absence of an inflection point representing a point where a changing direction of the setting value changes from increase to decrease or a point where a changing direction of the setting value changes from decrease to increase;

wherein determining the operation method comprises;

dividing the successive operation period into a plurality of local periods as the inflection point is the partition in a case in which the inflection point exists in the successive operation period and determining the operation method based on the change amount which is difference between a first point and a last point in each local period;

determining that the operation method is a ramping operation for increase in a case in which the change amount is positive and is larger than a threshold value;

performing sign inversion on the change amount in a case in which the change amount is negative, and determine that the operation method is a ramping operation for decrease in a case in which the sign inverted change amount is larger than a threshold value; and

determining that the operation method is fine-tuning in a case in which the operation method is not determined as the ramping operation for increase or the ramping operation for decrease.

15. An event analysis method according to claim 14, wherein

collecting event log data arranged in time series;

and

analyzing one or more of event log data and extracting one or more of basic unit operation data.

16. A non-transitory computer readable storage medium that stores a computer program for causing, when executed by a computer, the computer to perform for a distributed control system (DCS) that controls operations in a plant:

collecting event log data representing operation history which the DCS operator performed;

analyzing event log data and extracting basic unit operation data representing a operation method operated by the DCS operator; and

analyzing the basic unit operation data and extracting unit operation data representing an operation intention of the operation which the DCS operator performed,

wherein analyzing the event log data comprises;

detecting, based on the event log data, a successive operation period in which operations for changing a setting value of the identical type for a single control system are performed continuously in time; and

analyzing a trend representing transition of the setting value in the successive operation period;

wherein extracting the basic unit operation data comprises;

determining the operation method based on a change amount of the setting value, and thereby extracting the basic unit operation data;

wherein analyzing the trend comprises;

analyzing the trend to detect presence or absence of an inflection point representing a point where a changing direction of the setting value changes from increase to decrease or a point where a changing direction of the setting value changes from decrease to increase; and

wherein determining the operation method comprises;

dividing the successive operation period into a plurality of local periods as the inflection point is the partition in a case in which the inflection point exists in the successive operation period and determining the operation method based on the change amount which is difference between a first point and a last point in each local period;

determining that the operation method is a ramping operation for increase in a case in which the change amount is positive and is larger than a threshold value;

performing sign inversion on the change amount in a case in which the change amount is negative, and determine that the operation method is a ramping operation for decrease in a case in which the sign inverted change amount is larger than a threshold value; and

determining that the operation method is fine-tuning in a case in which the operation method is not determined as the ramping operation for increase or the ramping operation for decrease.

17. The non-transitory computer readable storage medium according to claim 16, wherein

collecting a set of event log data arranged in time series;

analyzing one or more of event log data and extracting one or more of basic unit operation data.