• Proceedings of the KIEE Conference
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• 1992.07a
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• pp.354-358
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• 1992

본 연구에서는 n-차 비선형 로보트 매니퓰레이터에서 링크의 동특성에 액류웨이터의 동특성을 포함시킨 복합모델(Combined Model)의 알고리즘을 제안하였다. 여기서 이 복합 모델의 알고리즘은 고속운전 및 빈번한 부하의 변동시에 중요한 역할을 하는 액류웨이터 모터의 동특성 방정식과 매니퓰레이터 링크의 운동을 묘사하는 동특성 방정식을 포함시킨 알고리즘을 의미한다. 또한 제안된 모델은 선영궤환 및 감결합 변환(Feedback Linearizing and Decoupling Transformation : FLDT)법을 이용하여 선형시스템으로 변환시켰다. 따라서 본 연구에서는 고속운전 및 빈번한 부하의 변동에도 액류웨이터 모터의 전압과 전류를 조절함으로써 효과적으로 제어할 수 있게 하는 매니퓰레이터 모델 알고리즘을 개발하는데 그 목적이 있다.

• Proceedings of the KIEE Conference
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• 1998.07b
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• pp.407-409
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• 1998

In order to improve the tracking performance of $2{\times}2$ multivariable control systems, a fuzzy control algorithm with feedforward compensator is represented. The method consists in two steps. First, neglecting interconnections. one designs a fuzzy controller to each individual loop. In the second stage, low-order transfer functions of outputs to reference inputs are estimated. We propose a design method of the feed forward compensator based on the transfer functions. An illustrative example are shown.

• Proceedings of the KIEE Conference
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• 1998.07f
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• pp.2015-2017
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• 1998

This paper deals with the design of a field oriented control system model for the high performance induction motor using Matlab with Simulink. The proposed control system model, which is not used the speed and flux sensor, contains IM model, Tranformation, Decoupling, FFOC(Field Flux Orientation Controller), Torque calculator and PI Controller to control speed, torque. Results present the stator and rotor flux phasor trajectory, the startup and transient response of speed, torque and stator current with field oriented control and the response to changes in reference speed with no load. This paper shows that the propose control system is more robust than other vector control system, and suggest the enchanced model, using Matlab with Simulink for the high performance in induction motor control.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.252-253
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• 2017

본 논문에서는 벅-타입 능동 전력 디커플링 회로의 새로운 듀티 사이클 생성 방법을 제안한다. 기존의 듀티 사이클 생성방법에 비해 단순해진 듀티 사이클 계산 방식은 저성능 마이크로 프로세서에도 적합함과 동시에 보다 효과적으로 능동 전력 디커플링 회로를 제어할 수 있다. 제안하는 회로는 전류 불연속 모드로 동작하며, 전류 지령치는 DC링크 전류의 1차 리플 성분에 전류 이득을 보상하여 생성하기 때문에 모든 구간에서 효과적으로 DC링크의 전압 리플을 줄일 수 있다. 제안하는 듀티 사이클 생성 방법의 효과는 MATLAB-Simulink을 통해 검증하였다.

• Proceedings of the KIEE Conference
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• 2000.11b
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• pp.315-317
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• 2000

Linear induction motor(LIM) have static and dynamic end effects due to its finite core length, so that per-phase impedances are asymmetric and the air gap flux distribution is distorted. So, this paper propose the d-q axis equivalent circuit and vector control method considering both static and dynamic end effects of the LIM. This vector control method consists of the slip frequency control, the time-invariant control and decoupling control. As a result, it is shown that the results of equivalent circuit method have a goof agreement with the results of finite element method.

• The Transactions of the Korean Institute of Power Electronics
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• v.1 no.1
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• pp.27-37
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• 1996

This paper proposes the control algorithm for maximum efficiency drive of PWM inverter - induction motor system with high dynamic performance. If the induction motor is driven under light load with rated magnetizing current, the Iron loss is excessively large compared with the codder loss which results in doer motor efficiency. Maximum efficiency drive of an induction motor can be achieved by controlling the magnetizing current to satisfy the optimal ratio that leads the total motor loss to be a minimum value at a given speed. The proposed control algorithm essentially uses vector control technique and adopts voltage decoupling control strategy to prevent the degradation of dynamic performance due to reduced magnetizing current. To verify the proposed method, digital simulations and experiments are carried out for a squirrel-cage induction motor with the rating of 2.2[kW].

• The Transactions of the Korean Institute of Power Electronics
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• v.17 no.5
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• pp.438-444
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• 2012

This paper deals with the active and reactive power control of Grid connected system. It was shown that active power and reactive power can be dependently controlled with two individually adaptable parameters. The two parameters are power angle and voltage magnitude. Transient state will occur with active or reactive power reference value variation. This paper presents a new control strategy for active and reactive power control of less interaction and improved transient response. The paper details the control technique by the mathematical and electrical network analysis of the methodology. The performance was verified through computer simulation using MATLAB Simulink and experiment.

• The Transactions of the Korean Institute of Power Electronics
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• v.23 no.6
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• pp.403-407
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• 2018

This study proposes a predictive direct power control method in a modular multilevel converter (MMC) high-voltage direct-current (HVDC) system. The conventional proportional integral (PI)-based control method uses a cascaded connection and requires an optimal gain selection procedure and additional decoupling scheme. However, the proposed control method has a simple structure for active/reactive power control due to the direct power control scheme and exhibits a fast dynamic response by predicting the future status of system variables and considering time delay. The effectiveness of the proposed method is verified by simulation results.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.330-331
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• 2019

본 논문에서는 전기자동차 온-보드 충전기용 단상전력변환시스템에서 능동전력디커플링 회로를 병렬로 연결하는 시스템 구조 및 그에 대한 제어 방법을 제시한다. 제안하는 시스템은 전기자동차 구동 인버터의 전력반도체와 구동모터의 고정자를 이용하여 능동전력디커플링 회로를 구성함으로 추가적인 부품을 최소화하고 전체 시스템의 전력밀도를 높임과 동시에 가격상승을 억제한다. 제안한 방식의 성능은 MATLAB/Simulink 시뮬레이션을 활용한 결과를 통해 비교 분석하였다.

• The Journal of Korea Robotics Society
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• v.16 no.1
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• pp.72-78
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• 2021

This paper presents a robust impedance control of high-DOF robot based on disturbance observer(DOB). A novel DOB is derived by considering the residual disturbance caused by the difference between actual disturbance and disturbance decoupling input which utilizes the estimated disturbance. It focuses on the elimination of the residual disturbance and improvement of the control performance as well as the good estimation of disturbances. In the control of high-DOF robot, numerical dynamic model, which is conducted by a software based on dynamics, is utilized because the analytical model of high-DOF robot is difficult to be obtained. The simulation of high-DOF robot with numerical dynamic model is provided to verify the performance of the proposed controller.