Hydroelectric generating set state monitoring signal digital filtering method, device and system based on time-frequency conversion

The invention discloses a hydroelectric generating set state monitoring signal digital filtering method, device and system based on time-frequency conversion, and the method comprises the steps: obtaining a set filtering parameter which corresponds to one or more filtering frequency bands; performing fast Fourier transform calculation on the obtained original time domain waveform data of the statemonitoring signal to obtain initial frequency domain data of the original time domain waveform data; filtering the initial frequency domain data based on each filtering frequency band corresponding to the filtering parameter to obtain new frequency domain data; carrying out inverse fast Fourier transform on the new frequency domain data to obtain a new time domain waveform, and completing digitalfiltering of the state monitoring signal. According to the invention, an original time domain waveform signal is monitored for a state; fast Fourier transform calculation is performed to obtain frequency domain data of a moni