The invention discloses a power
plant intelligent maintenance method and
system based on multi-
modal dynamic graph learning. The method comprises the following steps: acquiring structured sensor data,
unstructured data and equipment physical topology data of equipment operation in real time through a multi-source
sensor cluster and an industrial terminal; the method comprises the following steps: preprocessing multi-
modal data, and fusing multi-
modal features by using a double-flow Transform architecture and a gated attention mechanism to generate a joint embedded representation; constructing a dynamic causal
graph based on equipment physical topology data and sensor
time sequence characteristics, updating an edge weight through a GraphSAGE
algorithm, fusing domain rule constraints, and outputting
equipment state information; generating a
maintenance strategy through an improved near-end strategy optimization
algorithm according to the state and the equipment
health index; and finally, the
maintenance strategy triggers third-level early warning of the DCS through an OPC UA protocol, and a maintenance instruction is accurately issued. According to the method, the defects of a traditional method in the aspects of data fusion,
fault modeling and
decision making are overcome, and the safety, the economical efficiency and the operation and maintenance intelligent level of power
plant equipment are remarkably improved.