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서재호 圓光大學校 1990 論文集 Vol.24 No.2
In this paper, a new method of reducing harmonics that involved input ac line currents on it output dc voltage of the converter system is presented, which is due mainly to the equipment of 2-5 switching taps on interphase reactor. Therefore, the originality of this paper lies in microprocessor based equipment of the 2-5 switching taps on interphase reactor. I applied this method to the 12 pulse converter, and proved validity of that theoretically and experimentally. I propose a furthermore improved method, in which I employ an switching taps circuit constructed with only thyristors in the circuit of interphase reactor. Therefore, main contents of this study are the following two items; 1) Optimum value of turn ratio of interphase reactor. 2) Optimum value of control angle of switching taps. However, in case that the 5tap method is applicable to above optimum conditions, it could not bring to an effect of reducing hamonics under firing angle 15。. At present I can conclude that the converter must be constructed switching taps circuit and must be controlled 2-5 tap changing method.
마이크로프로셰서를 이용한 디지탈 PLL시스템에 의한 3상 유도전동기의 속도제어에 관한 연구
徐在鎬 圓光大學校 1987 論文集 Vol.21 No.2
이 논문은 Phase-Locked Loop (PLL) 속도제어계의 계통구성에 의한 위상차검출기를 제작하여 Phase Frequency Detector (PFD)에 의한 오차전압은 Analog Switch 에 의해 정확한 속도 위상차 만을 Microprocessor에 전달하도록 하고, digital controller의 Hard ware를 구성하여 digital filter를 설계하였으며 Analog 제어기법인 PLL의 filter에서의 정상오차를 digital기법에 의해 drift가 없고 주파수 응답특성이 이상적이 될 수 있도록 시스템을 완성 제작하였다. 또한 이 시스템을 이용한 실험을 행하여 고정도(高精度)의 3 상농형 유도전동기 속도제어가 가능하다는 결론을 얻었다. This paper presents a microprocessor-based digital PLL speed control system. In this system digital techniques provide all the funtions such as detection of speed and phase error of the rotor. The Completely digital scheme is free from drift and off-set error which are inherent in an analog circuit, Digital filter using microprocessor are employed. An experimental apparatus including a 0.5 ?? 2 Pole 3 Phase induction motor is concluded that the PLL system of digital fillter using microprocessor is a system with excellent speed regulation.