PLANT MONITORING DEVICE, PLANT MONITORING PROGRAM, AND PLANT MONITORING METHOD

摘要

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.

主权项

1. A plant monitoring device which monitors the operation state of a plant having a plurality of evaluation items, the plant monitoring device comprising:
state quantity acquisition means for acquiring, from the plant, a bundle of state quantities which is a collection of state quantities of the respective evaluation items; 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 configured by a plurality of bundles of state quantities; state quantity extraction means for extracting, at every predefined evaluation cycle, a bundle of state quantities to be evaluated from the state quantity storage means; Mahalanobis distance calculation means for calculating, at every evaluation cycle, the Mahalanobis distance of the bundle of state quantities extracted by the state quantity extraction means based on the unit space stored in the unit space storage means; determination means for determining, at every evaluation cycle, whether or not the operation state of the plant is normal according to whether or not the Mahalanobis distance calculated by the Mahalanobis distance calculation means is within a predetermined threshold value; and unit space update means for adding the bundle of state quantities extracted by the state quantity extraction means to the unit space stored in the unit space storage means while deleting the oldest bundle of state quantities from the unit space at a predefined update cycle longer than the evaluation cycle.