PLANT STATE MONITORING METHOD, PLANT STATE MONITORING COMPUTER PROGRAM AND PLANT STATE MONITORING DEVICE

摘要

PROBLEM TO BE SOLVED: To improve determining accuracy of the existence of abnormality on a plant state.SOLUTION: When monitoring an operation state of a plant by using a Mahalanobis distance on a plant state amount, a unit space A(N) being an aggregate of data used to be a reference when determining whether a plant operation state is normal or not, is made based on the plant state amount in a period from time of going back to the past by a first period (for m days) from time (N day) for evaluating the plant state, to time of going back further to the past by a second period (for n days) from that time.