The application discloses a double-fed
wind power converter fault diagnosis method and
system based on multi-
source data fusion. When the converter detects that an electrical quantity exceeds a threshold value or receives a manual starting instruction of an operation and maintenance personnel, each acquisition module is triggered to work. A preprocessing unit performs interpolation, time axis alignment and denoising
processing on the acquired multi-
source data, and generates a
data set in a unified format. A
feature extraction unit extracts fault characteristic quantities by using Fourier
algorithm, symmetrical component method, four sampling value method and other methods, and outputs a
feature data set. Multiple subsystems are independently diagnosed, and respective
preliminary diagnosis results are output. A fusion
decision unit substitutes the preliminary results of each subsystem into a preset rule base, performs multi-
source data fusion by using a weighted voting method, outputs a final diagnosis conclusion, and outputs the result to a
closed loop feedback. The application significantly improves the accuracy and
engineering practicability of double-fed
wind power converter fault diagnosis by using multi-source data fusion and hierarchical diagnosis, and reduces operation and maintenance costs.