• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.1
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• pp.68-73
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• 2003

This paper describes a newly developed vector drive system without the speed sensor using theory of a flus observer and based on the field oriented vector control. The new method of speed estimation is presented to operate with the position and magnitude of the secondary flux vector which obtain to the observer md detected current. As the speed of estimation is determined to the flux and the motor constants, this method don't need to adjust the gain of the parameter and is operated simply. On basic the derived theory for vector control, sensorless speed control system for induction motor drive is design and realized. It is determined a controllers gain and observer gain by simulation and the experiment of sensorless vector drive is realized.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.13 no.6
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• pp.556-561
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• 2020

The aging and declining agricultural population in the modern society requires improvement of the agricultural environment and is one of the representative problems. And since most of the work systems always require a transport work, the ratio of labor consumed in the transport work is very high. Accordingly, many types of transport vehicles are being developed and sold, and in the early days, most of them are powered transport vehicles using fossil fuels. However, it is paying attention to next-generation eco-friendly energy such as hydrogen, fuel cells, solar power, and bio due to the strengthening of international environmental regulations such as global warming and the Convention on Climate Change and the depletion of fossil fuels. Therefore, in this study, the ultimate goal is to develop an eco-friendly, easy-to-operate, safe agricultural electric vehicle that replaces fossil fuels. It was designed with a focus on controlling a wide range of vehicle speeds and securing stability of electric agricultural vehicles. Considering the performance and design, it is composed of a frame, a driving part, a steering part, and a controller system, and we are going to review and manufacture each part. It is believed that the manufactured electric vehicle for agriculture can be easily and conveniently operated in an agricultural society where young manpower is scarce, and can be helpful to the agricultural society through high efficiency.

• Proceedings of the KIEE Conference
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• 1997.07f
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• pp.1954-1956
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• 1997

In this paper, a variable structure current control scheme for field-oriented induction motor drive is presented. The current controller based on space voltage vector PWM scheme consists of feedforward, decouple and variable structure control. The proposed current controller tracks reference value quickly, has robust property against parameter variation and disturbance, reduces switching frequency and improves performance of induction motor drive. Finally, the proposed current controller is verified by digital simulation

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.559-560
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• 2011

최근 전기자동차와 신재생에너지 발전 시스템의 전기 저장장치로 고용량 2차 전지의 개발 및 상용화가 활발히 이루어지고 있으며, 기술 연구 또한 꾸준히 진행되고 있다. 배터리에 대한 활용도가 높아지면서 배터리의 성능평가에 대한 관심도 높아지고 있다. 본 논문에서는 LabVIEW를 이용하여 배터리 자동 충 방전 제어 테스트 장치를 구축하여, 원격제어 및 실시간 모니터링을 통해 데이터 분석 및 저장이 가능하며, 다양한 배터리의 성능평가를 설정 값 변경으로 손쉽게 평가 할 수 있도록 장치를 개발 하였다.

• Proceedings of the KIEE Conference
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• 2005.05a
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• pp.122-124
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• 2005

In this paper, we propose a switching control method for 2nd order nonlinear systems. The main idea behind the method is changing the control law before the trajectory of the solution arrives at the singularities imposed on the denominator of the control law. We show that the control system is asymptotically stable from the fact that the sector consisting of the singular hyperplanes is an invariant set. Illustrative examples are given.

• The Magazine for Energy Service Companies
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• s.37
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• pp.86-89
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• 2005

삼성에버랜드 에너지절감형 '증기재압축시스템' 개발 · 상용화 성공/ 삼천리 산업기술대 열병합 도입 계약 체결/ LS산전 호남화력에 FD Fan 고압 인버터 설치/ (주)하이세스 절전기 '하이세스' 출시/ 현대차 김관중 동력팀장 '움직이면 커지는 엔트로피 이해' 책자 발간/ 산업자원위원회 에너지기본법 통과/ (주)케너텍 전기판매, 민간 사업자 1호 달성/ 일진전기(주) 최진용 대표 '산업포장'/ 포스코 에너지절감으로 원가 경쟁력 향상/ 울산시 삼성석화 등 에너지 절약 우수업체 선정/ 시민사회 '에너지를 생각하는 사람들의 알찬 모임' 화제/ 신재생에너지센터 공기관 대상 신재생에너지의무화 사업 설명회/ 에너지관리공단 열병합발전 설계자 대상 교육 실시

• Proceedings of the KIEE Conference
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• 2002.07a
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• pp.241-243
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• 2002

This paper proposes a DRMS(Distribution Remote Management System) based on the advanced digital kwh-meter. The proposed URMS is designed so as to be able to collect the voltage management data, the load management data as well as the used kwh data from advanced kwh-meter remotelly. It makes the integrated management of distribution system possible and enhances highly the economics of the existing remote meter-reading system based on the only used kwh-data. Also it can improve highly the quality of power supplied to the electric customer by minimizing the volt age management cost and by enhancing the efficiency of load management.

• Proceedings of the KIEE Conference
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• 2004.07d
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• pp.2224-2226
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• 2004

현재 ATM 망의 ABR 소스에서 불확실한 시간지연에 대한 이산시 모델에 대해, 많은 연구가 진행되고 있다. 이 모델들은 각각의 소스에서의 대역폭(Bandwidth)을 일정하게 보고 있지만, 현실적으로 소스의 네트워크 상황에 따라 각기 할당되는 대역폭은 큰 차이가 있다. 각기 다른 대역폭을 고려할 때 ABR 스위치 모델은 특이 섭동 구조를 갖는다. 본 연구에서는 대역폭 차에 따른 ABR 스위치에서의 특이 섭동 모델을 제안하고 ABR 스위치에서의 체증을 해결하기 위해 합성제어 기법을 이용한 이산시 최적 제어기를 설계한다.

• Proceedings of the KIEE Conference
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• 2004.04a
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• pp.192-195
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• 2004

Into investment expense that wind generation system that is one of clean energy is less than existent energy in narrow shipfitter maximum effect to source of energy that have Eoteulsu evaluate. There is shortcoming that Blade structure of existent aerogenerator faces at problem of safety accident in overpopulated area and noise and have additional expense of supply of electric power equipment. In this paper, We wish to supplement problem that is such through design of special Blade structure that have noise reduction and stability. Wish to achieve design and simulation of blade to use CATIA for this, and analyze adaptedness of system.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.58 no.1
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• pp.187-192
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• 2009

This paper presents a method for designing a robust controller that alleviates disturbance effects and compensates performance degradation owing to the time-delay. Disturbance observer(DOB) approach as a tool of robust control has been widely employed in industry. However, since the Pade approximation of time-delay makes the plant non-minimum phase, the classical DOB cannot be applied directly to the system with time-delay. By using a new DOB structure for non-minimum phase systems together with the Smith Predictor, we propose a new controller for reducing the both effects of disturbance and time-delay. Moreover, the closed-loop system can be made robust against uncertain time-delay with the help of a Pill controller tuning method that is based on a second-order plus dead time modeling technique.