Active inverter intermittent fault diagnosis method

The invention relates to the field of inverter intermittent fault diagnosis, in particular to an active inverter intermittent fault diagnosis method. The active inverter intermittent fault diagnosis method is based on the combination of wavelet packet transform and a random forest algorithm to diagnose intermittent faults of an active inverter. The active inverter intermittent fault diagnosis method comprises the steps that firstly, three-phase current signals output by various working states of the active inverter are collected, then wavelet packet decomposition and reconstruction are used for extracting characteristic information of the active inverter in the existing working state operation process, the intermittent faults are distinguished according to characteristic differences of wavelet packet decomposition and reconstruction timing diagrams under different states, decision trees are trained by CART algorithm using the characteristic information, and random forests are generatedby voting for each tree;