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權營顔 부산대학교 공과대학 1988 硏究報告 Vol.35 No.-
Superconducting Magnet Energy Storage(SMES) has many advantages as energy storage system: high efficiency, fast response, relative easiness to site near load center, nonpolluting, satisfactory economies for large units, and low cost in operation and maintenance. This paper is a study on power control of SMESS. Superconducting magnet of 25 KJ is used and electrical system is composed of power converter part, control part, measuring part, firing part, interfacing part and protection part. Double Graetz bridge is used as a power converter between 3-phase source line and superconducting magnet, and IBM-PC is used for digital control of active and reactive power in control part. Power controls are performed well as shown in experimental results. Harmonics due to power converter is reduced by series transformer connection of delta-delta and wye-delta.
權營顔 부산대학교 공과대학 1990 硏究報告 Vol.40 No.-
Superconducting reactors are feasible for several applications because they can overcome resistance loss and capacity limit. In the design of superconducting reactor the minimization of ists volume is very important because superconductor is saved, and heat loss is reduced. In this paper the curves related to inductances is effectively used for line search that finds the minimum volume. The nonlinear programming is also used for minimization of reactor volume. Finally the curve of opimum shape is presented by combining results of two methods.
Bioproducts의 건조를 위한 건조기와 건조방식의 고찰
권영안 한국산업식품공학회 2004 산업 식품공학 Vol.8 No.4
Clearly, it is important to provide an overview all of the emerging drying technologies that are relevant to drying of the diverse and ever increasing numbers of bioproducts. There are a lot of different methods to dry bioproducts, but the most important thing of the bioproducts drying is the selection of dryer and drying method which is not affected to the original components of the bioproducts after drying. Moreover, conventional thermal processes in drying frequently lead to undesirable flavor and loss of desirable fresh flavor, aroma, vitamins, and essential nutrients. These negative effects on food quality can be the motivation to search a new technology and we try to emerge this new technology to conventional drying technology. Therefore, I'd like to review the emerging drying technologies and it may help to choose the dryer and drying technology for the bioproducts.
權營顔 부산대학교 공과대학 1987 硏究報告 Vol.34 No.-
Since Kunzler demonstrated a high field superconducting magnet in 1961, superconducting magnets have been feasible for many applications which require high field or high efficiency. This paper studies the design of superconducting magnet in which 25KJ energy is stored. This study includes magnet design, current lead design and cryostat design for 25KJ superconducting magnet. Magnet design is performed in the view of minimum superconducting magnet volume. Current lead and cryostat are designed to minimize heat loss.
有限要素法을 利用한 超傳導 리액터의 인덕탄스計算에 관한 硏究
權營顔 부산대학교 공과대학 1989 硏究報告 Vol.38 No.-
Superconduction reactors are designed as solenoid shapes with rectangular cross sections, an they are air-cored because they produce high magnetic fields. Inductances of these shapes are usually calculated by Grover's tables. This study presents an inductance computation using finite element method, and also computes inductances of superconducting reactors with cooling channels that is difficult to be calculated by conventional results.
남정한,권영안 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.53 No.-
최근에 가전 및 군수분야등 여러 분야에서 스위치드 리럭턴스 전동기의 응용에 대한 관심이 커지면서 간단하고 저가이면서 양호한 구동특성을 보이는 속도제어 방식에 관한 연구의 중요성이 증대되고 있다. 본 논문에서는 스위치드 리럭턴스 전동기의 속도제어 방식에서 제어 가능한 변수로서 점호각과 소호각, 소정의 전류슈준을 설정하여 이 세가지 제어변수를 고려한 전압제어 및 전류제어 알고리즘을 설계하였다. 특히 스위치드 리럭턴스 전동기 및 인버터 구동회로를 포함하는 전체시스템의 특성을 고려한 전압제어 및 전류제어 알고리즘을 강구하였으며 이와 함께 원칩 마이크로프로세서인 80C196KC를 이용한 전압제어 및 전류제어를 구현하였다. 80C196KC는 고속입출력기능, PWM 기능, A/D컨버터기능 등을 내장하는 16비트 원칩 마이크로프로세서로서 본 연구에서는 이러한 기능들을 적절히 활용하는 전압제어 및 전류제어 알고리즘을 구성하고 상호 비교를 수행하였다. 본 연구에서 설계된 전압제어 및 전류제어 시스템은 실험을 통하여 운전특성 및 성능을 검증하였으며 본 연구를 통하여 80C196KC가 가지는 기능들은 불연속여자특성을 가지는 스위치드 리럭턴스 전동기의 전압제어 및 전류제어 구성에 매우 부합됨을 확인하였다. 본 연구에서 구성된 속도제어 시스템은 간단하고 저가이면서 양호한 구동특성을 보이는 속도제어 시스템에 활용될 것으로 기대된다. The switched reluctance motor is comparable to the inverter driven induction motor. Recently a switched reluctance motor is highly considered for the applications to home appliances and defence industry. Simultaneously a low cost controller with high performances becomes more significant for a switched reluctance motor drive. This paper investigates voltage and current controls of switched reluctance motor which are considering turn-on angle, turn-off angle and current level as controlled variables. One-chip microprocessor 80C196KC, an embedded microcontroller, is well applied to voltage and current controls of switched reluctance motor because a switched reluctance motor is excited by the excitiation modes of pulse type. Voltage and current control algorithms are implemented by utilizing several functions of 80C196KC. The proposed drive system is verified through the experiments, and may be utilized as a drive system with a low-cost and high-performance controller.