Diagnosis Method of Stator Short Circuit Fault of Pumped Storage Generator Based on FFT-LSTM
Stator short circuit fault is one of the common faults in pumped storage generators,which can have a serious impact on the performance and safety of the generator.To ensure the safe and stable operation of pumped storage generators,a FFT-LSTM based stator short circuit fault diagnosis method is proposed.Establish a stator winding inter turn short circuit fault model for pumped storage generators,and analyze the electrical and magnetic related states of the generator stator during short-circuit faults.Based on the three-phase current signal during the stator winding inter turn short circuit fault of a pumped storage generator,the three-phase current is transformed into two-phase current based on the principle of magnetic potential equality.The time-domain signal of the stator two-phase current is converted into a frequency-domain signal using FFT,and the fault current spectrum is obtained and input into the LSTM network for processing.The diagnosis result of the stator winding inter turn short circuit fault of the pumped storage generator is output.The experimental results show that this method can better distinguish between normal and fault states of pumped storage generators,achieve stator winding inter turn short circuit fault diagnosis of pumped storage generators,and have low cross entropy loss in fault diagnosis.
pumped storagea generatorstator short circuitFFTLSTMfault diagnosis
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