Abstract: An example method for abnormality detection based on causal graphs representing causal relationships of abnormalities includes detecting an abnormality in a test data set and generating a counterfactual data set for the test data set. The method further includes determining a quantitative feature dependence between the test data set and the counterfactual data set and determining a causal relationship of the abnormality based on the quantitative feature dependence. The method also includes generating a causal graph that represents the causal relationship of the abnormality. The method may also implement an action to mitigate the abnormality based on the causal graph.

Abstract: A method of energy-efficient control for central chiller plant systems includes the following steps: collecting performance characteristics of each piece of equipment in central chiller plant systems and establishing energy models for each piece of equipment in central chiller plant systems and establishing energy models for each piece of equipment according to performance characteristics; sampling, with a predetermined time interval, actual cooling load of central chiller plant systems, computing optimized system working conditions based on actual cooling load and energy models of each piece of equipment, wherein optimized system working conditions ensure the least global energy consumption of all of equipment in central chiller plant systems; adjusting working conditions for each piece of equipment according to optimized system working conditions; and repeating steps of collecting, sampling and adjusting. An energy-efficient control system for central chiller plant system is also disclosed.