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여자시스템과 동기발전기의 회전자 권선에 발생되는 과전압에 대한 보호회로 연구
류호선(H.S.RYU),임익헌(I.H.LIA) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
In the case of synchronous machines, certain power system disturbances cause the induced rotor current to assume negative values when no static converter is present. A converter, however, prevents negative current from flowing, so that overvoltages occur. The overvoltages can be effectively limited as crowbar circuit using GTO. This newly proposed crowbar circuit with current limiting resistor absorbs energy when overvoltage comes from power system repeatedly and verified through experiment
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
이영복(Y.B. Lee),김장묵(J.M. Kim),임익헌(I.H. Lim),류호선(H.S. Ryu),송승호(S.H. Song) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
The conventional analog-based firing circuit can be Implemented by comparing a linearly decreasing periodic sawtooth waveform synchronized to the ac line, With a voltage corresponding to the desired converter delay angle This circuit requires a large number of components (resistance and capacitor) and careful adjustment of the synchronization circuity in tills paper a novel firing circuit is proposed for thyristor switch is elements The proposed circuit is Implemented on the basis of the analog cosine method using FPGA and microprocessor<br/>