• Proceedings of the KIEE Conference
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• 1993.07b
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• pp.1041-1043
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• 1993

A robust position control scheme for a Brushless Direct Drive Motor(BLDDM) is presented. To obtain the robustness under the load variation, a Variable Structure Controller(VSC) is used. However, the VSC has a chattering problem and require the full state informations. To overcome this problem, in this paper, the sliding mode observer is used for compensating the load disturbance and estimating the motor velocity. As a result, the VSC for a BLDDM posision control is designed by using only position measurment and the chattering problem is greatly reduced. To show the validaty of the proposed scheme, the simulation study is carried out.

• Proceedings of the KIPE Conference
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• 2013.11a
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• pp.235-236
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• 2013

전력 시스템의 변화 및 전력 전자 소자의 발전으로 인하여 HVDC 시스템에 대한 관심이 높아지고 있다. 또한 기존의 Point-to-Point 형태의 HVDC 시스템에서 진보하여, 멀티 터미널 형태 그리고 풍력단지와 연계된 다양한 Topology가 계획 중이거나 실제도 구동되고 있다. 따라서 이러한 추세에 맞추어 풍력단지와 연계된 멀티터미널 시스템을 구현하였다. 본 시스템은 세 곳의 AC 계통 시스템과 한 곳의 풍력단지로 이루어져 있으며, 이는 전압형 컨버터를 통하여 DC 계통을 구성하였다. 풍력발전의 변동 및 Master 컨버터의 탈락 시험 또한 진행하였다.

• 제어로봇시스템학회:학술대회논문집
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• 1991.10b
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• pp.1833-1838
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• 1991

This paper presents a stabilization technique for unstable systems. An inverted pendulum, which is a typical unstable mechanical system, is considered and stabilized by a nonlinear control. The stabilization problem in this system is related to that in postural control of human being. In this paper, the variable structure control (VSC) is applied to the stabilization problem. Robustness by the VSC and that by a conventional linear feedback controller are compared.

• Proceedings of the KIEE Conference
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• 2005.11b
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• pp.328-330
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• 2005

This paper presents a transfer capability enhancement of using VSC HVDC system which can control reactive power as well as active power. The transfer capability is constrained by stability like voltage stability. These constraints may relieved by reactive power control ability of the VSC HVDC system. Site selection algorithm is also proposed.

• 제어로봇시스템학회:학술대회논문집
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• 1988.10a
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• pp.299-304
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• 1988

This paper describes the application of the variable structure control(VSC) concept for the position control of electro-hydraulic servomtor system. The basic philosopy of VSC is that the structure of the feedback control is altered as the state crosses discontinuity surfaces in the state surface with the result that certain desirable properties are achieved. The switching of the control function yields total(or selective) invariance to system parameter variations and disturbances, and closed loop eigen value placement in time-varing and uncertain systems.

• 제어로봇시스템학회:학술대회논문집
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• 1986.10a
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• pp.580-585
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• 1986

This paper deals with "chattering" problem in variable structure control system. For digital computer control, chattering reduction algorithm in Analog-VSC is extended to Discrete-VSC. The proposed algorithm is applied to position control of D.C Servo Motor by using 6502 .mu.-processor. The improved transient response, as well as a considerable reduction of chattering, is illustrated experimentally.imentally.

• Proceedings of the IEEK Conference
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• 1999.06a
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• pp.813-816
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• 1999

In this paper is Proposed a VSC(variable structure controller) for a high-speed and high-precision position control of a XY Table, which is based on the PI type reaching mode. Also the comparative study between the proposed method and the conventional PID controller is presented as well. Designed and tuned under repeated experiments, the proposed method showed a better reasonable performance than PID controller in the aspect of tracking error.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.420-420
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• 2000

In this paper, we propose an adaptive controller using RBFN(radial basis function network) for robot manipulators The structure of the proposed controller consists of a RBFN and VSC-1 ike control. RBFN is used in order to approximate かon system, and VSC-like control to guarantee robustness On the basis of the Lyapunov stability theorem, we guarantee the stability for the total system. And the learning law of RBFN is established by the Lyapunov method, Finally, we apply the proposed controller to tracking control for a 2 link SCARA type robot manipulator.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1991.04a
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• pp.214-224
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• 1991

The porpose in this study is to simulate te force required in the measurement of the performance of the equipments or testipieces. For the simulation of the required force, the difference in eachchamber pressure in the hydraulic cylinder was controlled with Variable Structure Control (VSC) theory. Also, nonlinear Variable Structure Observer (VSO) was designed to estimate the derivative of the load pressure which is necessary to determine the sliding surface in VSC theory. In this paper, the digital computer simulation and experiments were executed.

• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.280-281
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• 2020

본 논문은 MMC 기반의 전압형 HVDC System의 절연설계에 대한 내용을 담고 있다. 절연설계 시 필요한 Surge Arrester 전압결정, 이격거리, 연면거리에 대해 DC측과 AC측을 비교하고 그에 따른 계산 방법에 관한 내용을 기술한다.