The invention discloses a method and a
system for monitoring the reliability of a photovoltaic converter in a special
plateau environment. The method comprises the following steps: firstly, acquiring electrical quantity, temperature quantity, environment quantity and operation quantity, filtering abnormal data, and realizing accurate alignment of multi-frequency signals in combination with a
dynamic time warping algorithm; secondly, constructing a
plateau sensitive
feature set, and optimizing feature quality through physical consistency check and three-stage
feature selection; then, an IGBT
thermal fatigue equation and a
capacitance aging equation are fused to establish a
health index evolution model, a Bayesian
physical information neural network is used for prediction, and a high-reliability
confidence interval is output through Monte Carlo sampling. And finally, dynamically correcting the residual life based on the comprehensive environment factor, and triggering a hierarchical maintenance decision according to the
health index state, the residual life and the
confidence interval width. The service life prediction precision of the photovoltaic converter in the
plateau environment is remarkably improved, the operation and maintenance cost is effectively reduced, and the equipment operation reliability is enhanced.