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최홍규(Hong-Kyoo Choi),강태은(Tae-Eun Kang),원진희(Jin-Hee Won),조용상(Yong-Sang Cho) 한국조명·전기설비학회 1999 한국조명·전기설비학회 학술대회논문집 Vol.1999 No.-
본 연구에서는 현재 국내에서 사용하고 있는 3배광법 보다 정확도가 높은 구역 공간법에 대하여 설명하고, 구역 공간법이 평균 조도를 계산하는데 있어 필요한 조명 기구의 배광 곡선이나 반사율 등 그에 따른 자료의 부족으로 인해 국내 실정에 맞지 않는 문제점을 개선하고자 퍼지 추론 알고리즘을 제안하였다. 본 연구는 실내면의 조도에 영향을 주는 여러 가지 요소들을 변화시켰을 때도 기존의 3배광법과 구역 공간법에 비해 정확도가 높고 또한 기존의 구역 공간법을 이용하여 조도 계산을 할 때의 복잡함을 퍼지 추론을 이용하여 간단하게 하였다.
최홍규(Hong-Kyoo Choi),강태은(Tae-Eun Kang),송영주(Young-Joo Song),김병철(Byung-Chul Kim),전광호(Kwang-Ho Jun) 한국조명·전기설비학회 2003 한국조명·전기설비학회 학술대회논문집 Vol.2003 No.-
In this paper, a novel speed control system that implements the fuzzy logic controller(FLC) is proposed. Fuzzy controller is shown more excellent efficiency than a conventional controllers in the strength aspect and non-linear controller using IF-THEN rule which can control without process the accurate mathematical modeling about induction motor. But we cannot expect that conventional fuzzy controller divide equally the space of input and output parameter and use the certain shape of triangle membership function. Therefore to develop the efficiency of conventional fuzzy controller, We need to scale the range of membership functions. In this study, proposed fuzzy controller has the ability controlling scale of membership functions using by output scaling factor.
수동필터와 능동필터를 이용한 고조파 저감 대책에 관한 연구
김정한(Jung-Han Kim),강태은(Tae-Eun Kang),고영곤(Young-Kon Ko),김길영(Kil-Yung Kim),최홍규(Hong-Kyoo Choi) 한국조명·전기설비학회 2001 한국조명·전기설비학회 학술대회논문집 Vol.2001 No.-
최근 전력변환 응용 기기의 사용증가로 비선형 특성부하에 의한 고조파가 상당히 발생하고 있으며, 고조파에 의한 영향이 심각한 수준에 이르고 있다. 또한, 에너지 절약을 위하여 설치한 인버터에 의하여 고조파가 오히려 역률이 기대치 이하로 저하되는 현상을 초래한다. 따라서 본문에서는 산업현장에서 발행하는 고조파 장해를 조사(실측)하여 그 계통의 정확한 고조파를 분석하고 이를 바탕으로 고조파 성분에 따라 Filter를 이용한 고조파 저감 대책을 시뮬레이션을 통하여 구현하며, 저감된 개선사례를 중심으로 제시하였다.
Fuzzy 추론을 이용한 PWM Inverter에서의 고조파 저감에 관한 연구
최홍규(Hong-kyoo Choi),강태은(Tae-eun Kang),원진희(Jin-Hee Won),전광호(Gwang-ho Jun),조용상(Yong-Sang Cho),고만석(Man-Suk Ko),김진성(Jin-Sung Kim) 한국조명·전기설비학회 2000 한국조명·전기설비학회 학술대회논문집 Vol.2000 No.-
본 논문은 인버터 출력 파형에서 고조파 제거에 대한 이론적인 문제를 제시한다. 제시된 방법은 PWM 인버터 회로의 고조파 왜곡에 관한 문제를 분석하였다. 전압 제어 기법은 펄스 수와 각각의 고조파 크기를 변수로 하여 퍼지 추론에 의한 펄스 폭을 조정함으로써 전압 파형을 개선하였다.
崔琁雄,姜泰垠,崔洪圭 홍익대학교 산업기술연구소 1996 産業技術 Vol.6 No.-
About a half of Electric power is generated by nuclear power plants in korea. So, a stable operation of nuclear power plant is very important for suppling the essential national eletric power. A S/G (Steam Generator) level control is the most difficult system in PWR(Pressurized Water Reactor) nuclear power plant. Because of the non-linear and the non-nominal response of S/G level control, it is very difficult to control the level by automatic mode or manual mode. The goal of this study is to establish and verify a advanced control alogorithm by analyzing, modeling, stability calculation, controller parameter calculation, simulation for S/G level control system. The response of a S/G level was analyzed and understood mathmatically by modeling. Some parameters of nuclear power plant were analyzed by modeling and used to simulate the S/G level control. The S/G level control system was tested and analyzed with the S/G level model, the result of the analyzing the control loop is unstable with the present control parameters. The Nyquist mapping method was used to analyze the stability of a control loop. The phase crossover frequency is calculated and applied to verify the stability of a control loop. By calculation of a control parameter which let the phase crossover point be allways in the stability region with the phase crossover frequency, the control loop applied the caulation control parameter is also stable. The S/G level control is more stable and faster by appling the feed-forward control with the calculated control parameter. The result of this study may be applied to analyze and approve the S/G level control system of the nuclear power plants.
퍼지 논리 제어기를 이용한 유도 전동기 전류 제어에 대한 연구
崔洪圭,全光鎬,姜泰垠 홍익대학교 산업기술연구소 1995 産業技術 Vol.5 No.-
In this paper, we propose the control method of an inverter-fed induction motor using Fuzzy Logic Controller. The FLC chooses the switching states based on a set of fuzzy variables. Error in flux component magnitude of stator current error in torque component magnitude of stator current and flux position are used as fuzzy state variables. Fuzzy rules are determined by observing the vector diagram of flux and currents. The proposed controller shows a good dynamic speed response and decoupling characteristics. Moreover, since the rotor parameter has no effects on the performance the controller and the fuzzy controller possesses highly adaptive capability the performance of fuzzy controller is quite robust and insensitive to the motor parameters and change of operation conditions
崔洪圭,全光鎬,姜太垠,崔琁雄 홍익대학교 산업기술연구소 1997 産業技術 Vol.7 No.-
This paper proposes Dimming Ballast illumination control method using fuzzy reasoning the proposed method has the following effects. First the power saving above 50% is accompanied by the automatic control of the illumination and the choice of a turn-on or -off of a fluorescent lamps that is accompanied by the number of person and working time and weather Second the maintainment of the best illumination in spite of time and weather variation. Third More simple establishment and low than BAS(Building Automation System) because need not main control unit or communication cable
최홍규,전광호,최병숙,강태은 홍익대학교 산업기술연구소 1998 産業技術 Vol.8 No.-
The conventional PI control that are used in the control loop for outer speed of the induction motor, also has difficulty dealing with the dynamic speed tracking parameter variation and the load disturbance. As a result, the motion control system operates with a poor performance in the motor's low speed range. In this dissertation a novel speed control system that implements and fuzzy logic controller(FLC) is proposed. The proposed FLC used the speed error its rate of change and the drive current as three fuzzy variables. The real command output current is chosen by the dufuzzification of the fuzzy output extracted from the fuzzy control rules. The flux and the torque of the induction motor are estimated using the dynamic model with an excellent dynamic response over a wide speed range and with the rotor flux field-oriented scheme of the decoupling characteristics. The performance of this control system is substantiated by computer simulations.