Water chilling unit fault detection and diagnosis method and system

The invention discloses a water chilling unit fault detection and diagnosis method and system. The method comprises the following steps: constructing a three-dimensional modeling data set; extracting dynamic features among batches from the three-dimensional modeling data set by adopting a tensor analysis method, and extracting dynamic features in the same batch by adopting a slow feature analysis method, so as to construct a tensor slow feature analysis model; tensor slow features are extracted from the to-be-detected working condition data, monitoring statistics are constructed, and a control limit is determined, so that fault detection is carried out; tensor slow features are respectively extracted from the fault condition data and the historical fault data, different distribution weights and misclassification costs are given to the tensor slow features of each type of historical fault data, and a data gravitation classifier is iteratively trained according to the distribution weights; according to the misc