The present application relates to the field of auxiliary
control system diagnosis of thermal power plants, and provides a dynamic diagnosis method and
system for auxiliary control systems of thermal power plants based on a
time sequence state
machine, which slices and vectorizes real-time event streams through a
sliding time window, constructs a current observation event set, and analyzes a target event set under a current state in combination with a pre-constructed state
machine topology graph, performs set matching and out-of-order measurement on the observation events and the target events, quantifies the deviation degree of the
event sequence, introduces an elastic tolerance mechanism, flexibly determines the state transition on the basis of considering network
jitter and logical deviation, effectively distinguishes normal fluctuation, network micro-
jitter and serious logical out-of-order, and finally, accumulates the trend of the diagnosis result based on the
transition state pointer, updates the health degree image, generates a health degree report that can guide operation and maintenance, and effectively improves the adaptability to the state change of equipment in a complex industrial environment, and significantly enhances the
predictability of the operation of the auxiliary
control system and the scientificity of the operation and maintenance decision.