Plant state monitoring method, plant state monitoring computer program, and plant state monitoring apparatus

A non-transitory computer-readable recording medium containing computer executable instructions to cause a computer of a plant state monitoring apparatus to perform:

• acquiring a quantity of operation state of a gas turbine power generation plant via at least one sensor which is provided at the gas turbine power generation plant and coupled to the plant state monitoring apparatus, the quantity of operation state comprising a rotation speed of a gas turbine in the gas turbine power generation plant;
• storing the acquired quantity of operation state of the gas turbine power generation plant in a storage unit of the plant state monitoring apparatus;
• determining, by a processing unit of the plant state monitoring apparatus, that the gas turbine power generation plant is in a start operation period when the rotation speed is greater than or equal to a lower limit rotation speed and less than a rated rotation speed, and determining that the gas turbine power generation plant is in a load operation period when the rotation speed is greater than or equal to the rated rotation speed, the lower limit rotation speed indicating that the gas turbine is started up, and the rated rotation speed indicating that the gas turbine has started a rated speed operation;
• creating, by the processing unit, a first unit space, which is a set of data serving as a standard for determining whether or not the operation state of the gas turbine power generation plant during the start operation period is normal, based on the quantity of operation state of the gas turbine power generation plant during the start operation period;
• creating, by the processing unit, a second unit space, which is a set of data serving as a standard for determining whether or not the operation state of the gas turbine power generation plant during the load operation period is normal, based on the quantity of operation state of the gas turbine power generation plant during the load operation period;
• calculating, by the processing unit, a Mahalanobis distance based on the quantity of operation state of the gas turbine power generation plant, acquired when the operation state of the gas turbine power generation plant is evaluated;
• and
• determining, by the processing unit, whether the operation state of the gas turbine power generation plant is normal or abnormal, based on the Mahalanobis distance and a predetermined threshold value obtained from the first and second unit spaces;
• and
• in response to a determination that the operation state of the gas turbine power generation plant is abnormal, displaying, on a control panel, information relating to abnormality of the operation state of the gas turbine power generation plant,
• wherein
• said creating the first unit space comprises creating the first unit space based on the quantity of operation state of the gas turbine power generation plant acquired during a first period before a first time when the operation state of the gas turbine power generation plant is evaluated during the start operation period;
• the first period precedes the first time by a first length of time;
• the first period shifts along with the first time;
• said creating the second unit space comprises creating the second unit space based on the quantity of operation state of the gas turbine power generation plant acquired during a second period before a second time when the operation state of the gas turbine power generation plant is evaluated during the load operation period;
• the second period precedes the second time by a second length of time;
• the second period shifts along with the second time;
• said creating the first unit space comprises, in response to the first time being advanced forward in time,
• shifting the first period forward in time corresponding to the advanced first time, and
• creating the first unit space without considering the quantity of operation state of the gas turbine power generation plant that was acquired and used to create the first unit space before, but no longer falls in the shifted first period;
• and
• said creating the second unit space comprises, in response to the second time being advanced forward in time,
• shifting the second period forward in time corresponding to the advanced second time, and
• creating the second unit space without considering the quantity of operation state of the gas turbine power generation plant that was acquired and used to create the second unit space before, but no longer falls in the shifted second period.

A plant state monitoring apparatus, comprising:

• an input and output unit configured to be coupled to at least one sensor, which is provided at a gas turbine power generation plant, and to acquire a quantity of operation state of the gas turbine power generation plant from the at least one sensor, the quantity of operation state comprising a rotation speed of a gas turbine in the gas turbine power generation plant;
• a storage unit configured to store the acquired quantity of operation state of the gas turbine power generation plant;
• a unit space creating unit which is configured to
• determine that the gas turbine power generation plant is in a start operation period when the rotation speed is greater than or equal to a lower limit rotation speed and less than a rated rotation speed, and determine that the gas turbine power generation plant is in a load operation period when the rotation speed is greater than or equal to the rated rotation speed, the lower limit rotation speed indicating that the gas turbine is started up, and the rated rotation speed indicating that the gas turbine has started a rated speed operation,
• create a first unit space, which is a set of data serving as a standard for determining whether or not the operation state of the gas turbine power generation plant during the start operation period is normal, based on the quantity of operation state of the gas turbine power generation plant during the start operation period, and
• create a second unit space, which is a set of data serving as a standard for determining whether or not the operation state of the gas turbine power generation plant during the load operation period is normal, based on the quantity of operation state of the gas turbine power generation plant during the load operation period;
• a Mahalanobis distance calculating unit which is configured to calculate a Mahalanobis distance based on the quantity of operation state of the gas turbine power generation plant, acquired when the operation state of the gas turbine power generation plant is evaluated;
• and
• a plant state determining unit which is configured to determine whether the operation state of the gas turbine power generation plant is normal or abnormal, based on the Mahalanobis distance calculated by the Mahalanobis distance calculating unit and a predetermined threshold value obtained from the first and second unit spaces created by the unit space creating unit,
• wherein the input and output unit is configured to, in response to a determination that the operation state of the gas turbine power generation plant is abnormal, output, to a control panel, information relating to abnormality of the operation state of the gas turbine power generation plant,
• wherein said unit space creating unit is configured to
• create the first unit space based on the quantity of operation state of the gas turbine power generation plant acquired during a first period before a first time when the operation state of the gas turbine power generation plant is evaluated during the start operation period, the first period preceding the first time by a first length of time, and the first period shifting along with the first time;
• and
• create the second unit space based on the quantity of operation state of the gas turbine power generation plant acquired during a second period before a second time when the operation state of the gas turbine power generation plant is evaluated during the load operation period, the second period preceding the second time by a second length of time, and the second period shifting along with the second time;
• wherein said unit space creating unit is further configured to create the first unit space, in response to the first time being advanced forward in time, by
• shifting the first period forward in time corresponding to the advanced first time, and
• creating the first unit space without considering the quantity of operation state of the gas turbine power generation plant that was acquired and used to create the first unit space before, but no longer falls in the shifted first period;
• and
• wherein said unit space creating unit is further configured to create the second unit space, in response to the second time being advanced forward in time, by
• shifting the second period forward in time corresponding to the advanced second time, and
• creating the second unit space without considering the quantity of operation state of the gas turbine power generation plant that was acquired and used to create the second unit space before, but no longer falls in the shifted second period.

A plant state monitoring method performed by a plant state monitoring apparatus, said plant state monitoring method comprising:

• acquiring a quantity of operation state of a gas turbine power generation plant via at least one sensor which is provided at the gas turbine power generation plant and coupled to the plant state monitoring apparatus, the quantity of operation state comprising a rotation speed of a gas turbine in the gas turbine power generation plant;
• storing the acquired quantity of operation state of the gas turbine power generation plant in a storage unit of the plant state monitoring apparatus;
• determining, by a processing unit of the plant state monitoring apparatus, that the gas turbine power generation plant is in a start operation period when the rotation speed is greater than or equal to a lower limit rotation speed and less than a rated rotation speed, and determining that the gas turbine power generation plant is in a load operation period when the rotation speed is greater than or equal to the rated rotation speed, the lower limit rotation speed indicating that the gas turbine is started up and the rated rotation speed indicating that the gas turbine has started a rated speed operation;
• creating, by the processing unit, a first unit space, which is a set of data serving as a standard for determining whether or not the operation state of the gas turbine power generation plant during the start operation period or the load operation period is normal, based on the quantity of operation state of the gas turbine power generation plant acquired during a first period before a first time when the operation state of the gas turbine power generation plant is evaluated, the first period preceding the first time by a first length of time, and the first period shifting along with the first time;
• creating, by the processing unit, a second unit space, which is a set of data serving as a standard for determining whether or not the operation state of the gas turbine power generation plant is normal, based on the quantity of operation state of the gas turbine power generation plant acquired during a second period before a second time when the operation state of the gas turbine power generation plant is evaluated, the second period preceding the second time by a second length of time, and the second period shifting along with the second time;
• determining, by the processing unit, whether the operation state of the gas turbine power generation plant is normal or abnormal, based on the first and second unit spaces;
• and
• in response to a determination that the operation state of the gas turbine power generation plant is abnormal, displaying, on a control panel, information relating to abnormality of the operation state of the gas turbine power generation plant,
• wherein
• said creating the first unit space comprises, in response to the first time being advanced forward in time,
• shifting the first period forward in time corresponding to the advanced first time, and
• creating the first unit space without considering the quantity of operation state of the gas turbine power generation plant that was acquired and used to create the first unit space before, but no longer falls in the shifted first period;
• and
• said creating the second unit space comprises, in response to the second time being advanced forward in time,
• shifting the second period forward in time corresponding to the advanced second time, and
• creating the second unit space without considering the quantity of operation state of the gas turbine power generation plant that was acquired and used to create the second unit space before, but no longer falls in the shifted second period.

A non-transitory computer-readable recording medium containing computer executable instructions to cause a computer of a plant state monitoring apparatus to perform:

• acquiring a quantity of operation state of a gas turbine power generation plant via at least one sensor which is provided at the gas turbine power generation plant and coupled to the plant state monitoring apparatus, the quantity of operation state comprising a rotation speed of a gas turbine in the gas turbine power generation plant;
• storing the acquired quantity of operation state of the gas turbine power generation plant in a storage unit of the plant state monitoring apparatus;
• determining, by a processing unit of the plant state monitoring apparatus, that the gas turbine power generation plant is in a start operation period when the rotation speed is greater than or equal to a lower limit rotation speed and less than a rated rotation speed, and determining that the gas turbine power generation plant is in a load operation period when the rotation speed is greater than or equal to the rated rotation speed, the lower limit rotation speed indicating that the gas turbine is started up and the rated rotation speed indicating that the gas turbine has started a rated speed operation;
• creating, by the processing unit, a first unit space, which is a set of data serving as a standard for determining whether or not the operation state of the gas turbine power generation plant during the start operation period or the load operation period is normal, based on the quantity of operation state of the gas turbine power generation plant acquired during a first period before a first time when the operation state of the gas turbine power generation plant is evaluated, the first period preceding the first time by a first length of time, and the first period shifting along with the first time;
• creating, by the processing unit, a second unit space, which is a set of data serving as a standard for determining whether or not the operation state of the gas turbine power generation plant is normal, based on the quantity of operation state of the gas turbine power generation plant acquired during a second period before a second time when the operation state of the gas turbine power generation plant is evaluated, the second period preceding the second time by a second length of time, and the second period shifting along with the second time;
• determining, by the processing unit, whether the operation state of the gas turbine power generation plant is normal or abnormal, based on the first and second unit spaces;
• and
• in response to a determination that the operation state of the gas turbine power generation plant is abnormal, displaying, on a control panel, information relating to abnormality of the operation state of the gas turbine power generation plant,
• wherein
• said creating the first unit space comprises, in response to the first time being advanced forward in time,
• shifting the first period forward in time corresponding to the advanced first time, and
• creating the first unit space without considering the quantity of operation state of the gas turbine power generation plant that was acquired and used to create the first unit space before, but no longer falls in the shifted first period;
• and
• said creating the second unit space comprises, in response to the second time being advanced forward in time,
• shifting the second period forward in time corresponding to the advanced second time, and
• creating the second unit space without considering the quantity of operation state of the gas turbine power generation plant that was acquired and used to create the second unit space before, but no longer falls in the shifted second period.

A plant state monitoring apparatus, comprising:

• an input and output unit configured to be coupled to at least one sensor, which is provided at a gas turbine power generation plant, and to acquire a quantity of operation state of the gas turbine power generation plant from the at least one sensor, the quantity of operation state comprising a rotation speed of a gas turbine in the gas turbine power generation plant;
• a storage unit configured to store the acquired quantity of operation state of the gas turbine power generation plant;
• a unit space creating unit which is configured to
• determine that the gas turbine power generation plant is in a start operation period when the rotation speed is greater than or equal to a lower limit rotation speed and less than a rated rotation speed, and determine that the gas turbine power generation plant is in a load operation period when the rotation speed is greater than or equal to the rated rotation speed, the lower limit rotation speed indicating that the gas turbine is started up and the rated rotation speed indicating that the gas turbine has started a rated speed operation,
• create a first unit space, which is a set of data serving as a standard for determining whether or not the operation state of the gas turbine power generation plant during the start operation period or the load operation period is normal, based on the quantity of operation state of the gas turbine power generation plant during a first period before a first time when the operation state of the gas turbine power generation plant is evaluated, the first period preceding the first time by a first length of time, and the first period shifting along with the first time, and
• create a second unit space, which is a set of data serving as a standard for determining whether or not the operation state of the gas turbine power generation plant is normal, based on the quantity of operation state of the gas turbine power generation plant acquired during a second period before a second time when the operation state of the gas turbine power generation plant is evaluated, the second period preceding the second time by a second length of time, and the second period shifting along with the second time;
• a Mahalanobis distance calculating unit which is configured to calculate a Mahalanobis distance based on the quantity of operation state of the gas turbine power generation plant, acquired when the operation state of the gas turbine power generation plant is evaluated;
• and
• a plant state determining unit which is configured to determine whether the operation state of the gas turbine power generation plant is normal or abnormal, based on the Mahalanobis distance calculated by the Mahalanobis distance calculating unit and a predetermined threshold value obtained from the first or second unit space created by the unit space creating unit,
• wherein the input and output unit is configured to, in response to a determination that the operation state of the gas turbine power generation plant is abnormal, output, to a control panel, information relating to abnormality of the operation state of the gas turbine power generation plant,
• wherein said unit space creating unit is further configured to create the first unit space, in response to the first time being advanced forward in time, by
• shifting the first period forward in time corresponding to the advanced first time, and
• creating the first unit space without considering the quantity of operation state of the gas turbine power generation plant that was acquired and used to create the first unit space before, but no longer falls in the shifted first period;
• and
• wherein said unit space creating unit is further configured to create the second unit space, in response to the second time being advanced forward in time, by
• shifting the second period forward in time corresponding to the advanced second time, and
• creating the second unit space without considering the quantity of operation state of the gas turbine power generation plant that was acquired and used to create the second unit space before, but no longer falls in the shifted second period.