Plant monitoring device, plant monitoring method, and plant monitoring program

A plant monitoring method using a plant monitoring device for monitoring a plant, the plant monitoring method comprising:

• a step of acquiring measured data of a plurality of variables indicating a state of the plant every predetermined period;
• a comparison step of comparing a deviation index value indicating a deviation between a reference data set, which is a set of reference data related to the plurality of variables, and the measured data with a diagnostic threshold value for performing an abnormality diagnosis of the plant;
• a step of updating the reference data set;
• and
• an operation mode switching step of switching an operation mode of the plant monitoring device between a monitoring mode, in which the plant is monitored on the basis of a comparison result in the comparison step, and a learning mode, in which at least the measured data when the deviation index value is greater than the diagnostic threshold value is incorporated into the reference data set,
• wherein, in the operation mode switching step, the operation mode is switched from the monitoring mode to the learning mode when the deviation index value is greater than the diagnostic threshold value and a learning mode transition condition is satisfied during an operation of the plant monitoring device in the monitoring mode.

A plant monitoring program for operating a plant monitoring device for monitoring a plant, the plant monitoring program causing a computer to execute:

• a procedure of acquiring measured data of a plurality of variables indicating a state of the plant every predetermined period;
• a comparison procedure of comparing a deviation index value indicating a deviation between a reference data set, which is a set of reference data related to the plurality of variables, and the measured data with a diagnostic threshold value for performing an abnormality diagnosis of the plant;
• a procedure of updating the reference data set;
• and
• a procedure of switching an operation mode of the plant monitoring device between a monitoring mode, in which the plant is monitored on the basis of a comparison result in the comparison procedure, and a learning mode, in which at least the measured data when the deviation index value is greater than the diagnostic threshold value is incorporated into the reference data set,
• wherein, in the procedure of switching the operation mode, the operation mode is switched from the monitoring mode to the learning mode when the deviation index value is greater than the diagnostic threshold value and a learning mode transition condition is satisfied during an operation of the plant monitoring device in the monitoring mode.