Plant monitoring device, plant monitoring method, and program

A plant monitoring method for monitoring an operation state of a plant, the plant monitoring method comprising:

• a step of acquiring a state quantity of each of a plurality of characteristic items of the plant;
• a step of calculating, for the state quantity acquired at a monitoring timing of the plant, an abnormality degree indicating a degree of approach to an abnormality side with a limit value set in advance for each characteristic item as a reference;
• a step of calculating distances of the state quantity and the abnormality degree acquired at the monitoring timing, which indicate a degree of separation from a normal operation state of the plant, using a statistical method;
• and
• a step of determining the operation state of the plant based on the calculated distance.

A program that causes a computer of a plant monitoring device for monitoring an operation state of a plant to function, the program causing the computer to execute:

• a step of acquiring a state quantity of each of a plurality of characteristic items of the plant;
• a step of calculating, for the state quantity acquired at a monitoring timing of the plant, an abnormality degree indicating a degree of approach to an abnormality side with a limit value set in advance for each characteristic item as a reference;
• a step of calculating distances of the state quantity and the abnormality degree acquired at the monitoring timing, which indicate a degree of separation from a normal operation state of the plant, using a statistical method;
• and
• a step of determining the operation state of the plant based on the calculated distance.