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디지탈 브리지형 인버터로 구동되는 저역통과 LC 필터를 가진 교류전동기의 전류 및 전력의 파형 개선 (I)
정주윤,박진길 한국마린엔지니어링학회 1995 한국마린엔지니어링학회지 Vol.19 No.3
The characteristics of the current waveforms and 3$\Phi$ power waveforms of the variable speed 3$\Phi$ AC motor system driven by the single-pulse PWM investigated in this paper. The system is composed of a digital bridge inverter and low pass LC filter. It is confirmed that current waveforms and 3$\Phi$ power waveforms can be improved by utilizing the high order low pass LC filter than that of lower order through computer simulation. Also, we propose the low pass LC filter revised from the conventional LC filter.
디지탈 브리지형 인버터로 구동되는 저역통과 LC 필터를 가진 교류전동기의 전류 및 전력의 파형 개선 (II)
정주윤,박진길 한국마린엔지니어링학회 1995 한국마린엔지니어링학회지 Vol.19 No.4
Recently, the AC motor which has a simple structure and needs less maintenance has become to be used frequently as a servomotor for position control in the automatic control field. This paper concerns with a method to improve the current and power waveforms of an AC motor, and the current waveforms and 3$\phi$ power waveforms are analyzed by FFT under verious running conditions. The system is composed of a digital bridge inverter, low pass LC filter, and 3$\phi$ AC motor. Through the computer simulations and experiments, it is confirmed that current waveforms and $\phi$ power waveforms con by improved by utilizing the high order low pass LC filter than that of lower order.
정주윤 동의공업대학 1998 論文集 Vol.24 No.1
Marine propulsion diesel engines which have a mechanical-hydraulic governor have been widely used to control engine speed until now. Recently, it was very difficult for this governor to regulate the speed of high power engines with a long stroke and low speed, because of the jiggling caused by the rough fluctuation of rotating torque as well as the hunting by long dead time occurring in the fuel combustion process. In this paper, an electro-hydraulic governor which utilized PID and fuzzy control algorithms is suggested to compensate for the faults of the mechanical-hydraulic governor. The Nichols chart is used to investigate the influence of parameters related to the hydraulic actuator and ship propulsion system. The computer simulation shows that the electro-hydraulic governor with PID and fuzzy logic controller has good performance improvement.
정주윤 동의공업대학 1999 論文集 Vol.25 No.1
Marine propulsion diesel engines which have a mechanical-hydraulic governor have been widely used to control engine speed until now. Recently, it was very difficult for this governor to regulate the speed of high power engines with a long stroke and low speed, because of the jiggling caused by the rough fluctuation of rotating torque as well as the hunting by long dead time occurring in the fuel combustion process. In this paper, an electro-hydraulic governor with utilized hybrid controller is suggested to compensate for the faults of the mechanical-hydraulic governor. The Nichols chart is used to investigate the influence of parameters related to the hydraulic actuator and ship propulsion system. The new hybrid controller which has advantages of PID and fuzzy logic controller has better speed characteristics for a low speed and long stroke diesel engine.
속도추정기를 이용한 3상유도전동기의 센서리스 속도제어에 관한 연구
정주윤,권형정 동의공업대학 2000 論文集 Vol.26 No.1
Several methods of induction motor drives, which use speed estimators instead of shaft encoders, have been reported. However, the characteristics of the vector control employing stator voltages and currents usually deteriorate as the speed gets lower because it is difficult to calculate rotor flux due to de-offset and saturation of integrators. In this paper, to make it possible to calculate rotor flux at standstill, the new rotor flux estimator which replace integrators with two lag circuits is proposed. Simulation and experiment results confirm the validity of this control scheme.
정주윤 동의공업대학 2001 論文集 Vol.27 No.1
A static VAR compensator using three-level voltage source inverter is presented for high voltage / high power applications. The dq-axis control of the inverter is controlled so as to compensate the reactive power of some load. This paper deals with the following topics by using 3.5 kVA experimental test system: system description, main reactive power controller.