• 조명전기설비학회논문지
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• 제18권1호
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• pp.122-128
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• 2004

본 논문에서는 가동자의 이동방향에 따른 진동과 고정자에 대하여 수직으로 작용하는 진동을 동시에 고려할 수 있는 이론을 제시함에 있어서, LSM의 구조를 기초로 자기등가회로를 구성하였으며, 자기등가회로에 대한 방정식을 이용하여 LSM의 전기적인 등가회로를 유도하였다. 그리고, LSM의 변위에 따른 수직력 분포를 유한요소법(Flux2D)으로 계산하였으며 이를 방정식으로 나타내었다. 최종적으로 1상 여자방식에 의한 가동자의 이동방향에 따른 진동과 고정자에 대하여 수직으로 작용하는 진동을 전압방정식, 추력 및 수직력 방정식, 운동방정식을 사용하여 ACSL(Advanced Continuous Simulation Language)에 의하여 시뮬레이션 하였다.

• 전자공학회논문지B
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• 제32B권12호
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• pp.1545-1551
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• 1995

As the modern industrial processes become more complex, it is getting more difficult to model and control the processes. Naturally, an advanced type of DCS(Distributed Control System) with higher level functions is being sought. Advanced DCS is a DCS with advanced functions such as fault diagnosis, GPC(Generalized Predictive Control), NN(Neural Network), and Fuzzy Control. In this thesis, we have studied a fuzzy control algorithm for realizing an advanced DCS. Its algorithm is implemented in a form of function code which is a process control language, being used by the industrial engineers. To verify the realized function code of the fuzzy control, the function code is applied to a continuous casting process of the Pohang Iron & Steel Works in Kwangyang. The rules of the fuzzy control were collected via interviews of the field operators and their operation documents. Finally under a real-time operating system environment, usability of the function code of the fuzzy control is shown via simulation for the continuous casting process.

• 한국산학기술학회논문지
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• 제4권4호
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• pp.323-328
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• 2003

본 논문에서는 통신 기지국용 전원으로 사용할 수 있는 직렬 공진형 컨버터 시스템의 새로운 제어방식을 제안하였다. 주파수 제어 직렬 공진형 컨버터 시스템은 병렬 출력 직렬 공진(Parallel Output Series Resonant: POSR)형태이기 때문에 부하변동에 강인하다. 또한 스위칭 주파수를 제어함으로써 입력전압의 변화에도 안정된 출력을 제공한다. 실제 시스템 제작에 앞서 제안된 병렬 출력 직렬 공진형 컨버터 시스템의 분석을 하였고 ACSL(Advanced Continuous Simulation Language)을 이용한 모의실험을 하였다. 또한 실제의 시스템을 제작 및 실험을 통하여 시스템 특성을 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 B
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• pp.995-998
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• 1995

As the modern industrial processes become more complex, it is getting more difficult to model and control the processes. Naturally, an advanced type of DCS(Distributed Control System) with higher level functions is being sought Advanced DCS is a DCS with advanced functions such as fault diagnosis, GPC(Generalized Predictive Control), NN(Neural Network), and Fuzzy Control. In this thesis, we have studied a fuzzy control algorithm for realizing an advanced DCS. Its algorithm is implemented in a form of function code which is a process control language, being used by the industrial engineers. To verify the realized function code of the fuzzy control, the function code is applied to a continuous casting process of the Pohang Iron & Steel Works in Kwangyang. The rules of the fuzzy control were collected via interviews of the field operators and their operation documents. Finally, usability of the function code of the fuzzy control is shown via simulation for the continuous casting process model.

• 대한전기학회논문지
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• 제38권9호
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• pp.671-683
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• 1989

A controller of interconnected power systems is investigated using an optimal multidimensional variable structure control. The switching hyperplane of the variable structure stabilizer is obtained by minimizing a quadratic performance index in continuous-time. A special feature of the optimal multidimensional variable structure stabilizer is that, when it is operated in the so-called sliding mode, the system response becomes insensitive to changes in the plant parameters. A digital simulation is performed by a digital computer using the Advanced Continuous Simulation Language (ACSL) package, which shows that the dynamic performance of the power system in response to mechanical torque changes is improved when optimal multidimensional variable sturcture stabilizers are employed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.1097-1099
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• 2002

본 논문에서는 제어용 전원으로 사용할수 있는 주파수 제어 직렬 공진형 컨버터의 동작 원리 및 특성을 살펴보고 실제의 제어용 전원을 설계 및 제작하려고 한다. 고성능의 SMPS 제작을 위한 공진형 컨버터 회로를 구성하고 실제 시스템 제작에 앞서 먼저 시뮬레이션을 통한 시스템의 분석을 하였다. 시뮬레이션 프로그램은 ACSL(Advanced Continuous Simulation Language)을 사용하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(1)
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• pp.69-72
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• 2003

In this paper new control strategy of series resonant converter system for control power supply is suggested. Frequency controlled series resonant converter system is robust to load variations because it is POSR(parallel output series resonant) type. And it provides stable output voltage by changing switching frequency to input voltage variations. Firstly, operation analysis about suggested series resonant converter system was carried. Then simulations using ACSL(Advanced Continuous Simulation Language) and experiments to actual system were carried to prove characteristics of suggested system.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2003년도 춘계학술발표논문집
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• pp.271-274
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• 2003

본 논문에서는 통신 기지국용 전원으로 사용할 수 있는 주파수 제어 직렬 공진형 컨버터의 동작 원리 및 특성을 살펴보고 실제의 전원 시스템을 설계 및 제작하려고 한다. 주파수 제어 공진형 컨버터 시스템은 POSR(Parallel Output Series Resonant) 형태이기 때문에 부하에 강인하고 주파수를 제어함으로써 입력전압의 변화에도 안정된 출력을 보여준다. 실제 시스템 제작에 앞서 먼저 시뮬레이션을 통한 시스템의 분석을 하였고 시뮬레이션 프로그램은 ACSL(Advanced Continuous Simulation Language)을 사용하였다.

• 한국정밀공학회지
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• 제13권12호
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• pp.54-62
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• 1996

To get the time response characteristics of the hydrostatic transmission, seaborne winch is modelde by using bond graphs. After modeling of its basic elements, it is represented as power flow, and the determination of variable causality. The state equations are derived by using CAMP. As dynamic stabilites and solutions are investigated by perturbation method and direct integration, winch system is stable. Simulations are performed under the conditions of low speed, high speed, and maximum tension. The pressure and flow rate of the hydrostatic transmission have a big overshoot. But when it is comparaed to the empirical data with simulation results, it is similar to each other. When a lead compensator is applied to improve response characteristics of the hydrostatic transmission, rise time and overshoot of the system are improved.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제5B권4호
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• pp.324-330
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• 2005

The complex sensorless control scheme is not practical for use in the field of home appliance systems because it is not economical. Therefore, it is necessary to introduce a simplified sensorless control scheme that is composed of least calculation to estimate the rotor position. This paper presents the principle of the rotor position estimation with comparison of the estimated flux linkage and reference flux linkage. In order to verify the feasibility of the control scheme, ACSL is used for the simulation and TI DSP TMS320F240 is used for the experiment.