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김영준(Y.J. Kim),김장목(J.M. Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
This paper describes a method for the detection of shorted-turn in the cylindrical synchronous generator rotor windings based on the discrete wavelet transform. Multi-resolution analysis(MRA) based on discrete wavelet transform provides a set of decomposed signals in independent frequency bands. In the proposed method, shorted-turn detection in rotor windings is based on the decomposition of the rotor currents, where wavelet coefficients of these signals have been extracted. Comparing these extracted coefficients is used for diagnosing the healthy machine from faulty machine. Experimental results show the effectiveness of the proposed method for shorted-turn detection in the cylindrical synchronous generator rotor windings.
강승우(S.W.Kang),박신현(S.H.Park),김장목(J.M.Kim),임익헌(I.H.Lim),류호선(H.S.Ryu),김진성(J.S.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
The large synchronous motor for the pumped-storage plant(or SFC : Static Frequency Converter) has to be brought up to 100% rated speed and synchronized with the AC power network. Starting the motor from rest is achieved by switching current into the stator winding so that interaction between tins stator current and the rotor flux will cause the correct direction of torque to be developed so that the motor turns m the required direction. Starting ranges of the synchronous motor are divided into three regions. The first region is at standstill, the second that is called by the forced commutation is from standstill to 5-8% of rated speed, and the third, which is called by the natural commutation, is from 5-8% of rated speed to 100% rated speed So This paper describes three regions of the control techniques of the pumped-storage synchronous motor drive