Abstract: Provided is a plant state monitoring method which monitors an operation state of a plant by using the Mahalanobis distance based on the plant state amount. The method creates a first unit space as a set of data used to be a reference when judging whether the plant operation state during a start operation period is normal according to the state amount in the plant start operation period. The method also creates a second unit space as a set of data used to be a reference when judging whether the plant operation state during a load operation period is normal according to the state amount in the plant load operation period.

Abstract: A plant monitoring device for monitoring the operation state of a plant, the plant monitoring device including: state quantity acquisition means for acquiring a bundle of state quantities; state quantity storage means in which the state quantity acquisition means stores the bundle of state quantities; unit space storage means for storing a unit space constituted by a collection of a plurality of bundles of state quantities; state quantity extraction means for extracting a bundle of state quantities; Mahalanobis distance calculation means for calculating, at every evaluation cycle, the Mahalanobis distance of the bundle of state quantities; determination means for determining whether or not the operation state of the plant is normal; and unit space update means for adding the bundle of state quantities to the unit space while deleting the oldest bundle of state quantities from the unit space at every predefined update cycle longer than the evaluation cycle.

Abstract: Provided is a plant state monitoring method which monitors an operation state of a plant by using the Mahalanobis distance based on the plant state amount. The method creates a first unit space as a set of data used to be a reference when judging whether the plant operation state during a start operation period is normal according to the state amount in the plant start operation period. The method also creates a second unit space as a set of data used to be a reference when judging whether the plant operation state during a load operation period is normal according to the state amount in the plant load operation period.

Abstract: Provided is a plant state monitoring method which monitors an operation state of a plant by using the Mahalanobis distance based on the plant state amount. The method creates a first unit space as a set of data used to be a reference when judging whether the plant operation state during a start operation period is normal according to the state amount in the plant start operation period. The method also creates a second unit space as a set of data used to be a reference when judging whether the plant operation state during a load operation period is normal according to the state amount in the plant load operation period.