基于子空间映射的船舶核动力二回路系统闭环故障诊断方法研究

To further improve the safety and reliability of second loop system of ship nuclear power plant, a subspace-aided closed-loop fault diagnosis approach was proposed for the second loop system of ship nuclear power plant. Firstly, considering the closed-loop control structure of the second loop system of ship nuclear power plant, an auxiliary matrix irrelevant to the noise term was constructed to decouple the auxiliary matrix from the noise. Then, Cholesky decomposition was performed on the auxiliary matrix and the output matrix to solve the data-driven residual observer of the second loop system, that is, the stable kernel representation (SKR). Meanwhile, the threshold, test statistic and fault detection logic were designed based on the trained input and output data, and the second loop system was diagnosed for faults through the tested input and output data. Finally, the experimental testing was conducted on the condensate pump and condenser of the second loop system. The experimental result verifies that the proposed method can effectively detect and diagnose faults in the second loop system.