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김지용(J.Y. Kim),전태원(T.W. Chun),이홍희(H.H. Lee),김흥근(H.G. Kim),노의철(E.C. Nho) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.11
This paper proposed a method for controlling the active power of a single-phase grid-connected photovoltaic(PV) system by the quasi-Z-source inverter (QZSI). The MPPT of PV array is achieved by adjusting a shoot-through time of QZSI. The PI+R controller is used for reducing the steady-state error of the grid current. The simulation studies are carried out to verify the performances of proposed system.
시판멸치액젓 및 까나리액젓의 품질특성 평가를 위한 이화학적 성분 및 Biogenic amine 함량 비교
김보경(Bo-Kyoung KIM),김용훈(Yong-Hoon KIM),이홍희(Hong-Hee LEE),조영제(Young-Je CHO),김대식(Dae-Sik KIM),오상민(Sang-Min OH),심길보(Kil-Bo SHIM) 한국수산해양교육학회 2011 水産海洋敎育硏究 Vol.23 No.4
This study was conducted to understand the quality characteristics of 20 kinds of commercial salt-fermented anchovy & sand lance sauces by measuring their the chemical compositions and 9 biogenic amines (tryptamine, 2-phenylethylamine, putrescin, cadaverine, histamine, tyramine, serotonin, noradrenaline, spermine) contents. The commercial salt-fermented anchovy sauces contained 65.84±0.11~70.60±0.21% of moisture, 20.50±0.41~25.60±0.42% of salinity, 0.98±0.01~2.05±0.05% total nitrogen, and 1,011.77±0.00~1,724.56±9.72 ㎎/100mL of amino nitrogen. Histamine was the major amine detected in salt-fermented fish sauces and it was varied from 421.27 to 1,507.18 ㎎/㎏ in salt-fermented anchovy sauces, whereas commercial salt-fermented sand lance sauces contained 67.87±0.28~69.63±0.17% moisture, 22.46±0.28~26.11±0.00% salinity, 0.92±0.01~1.71±0.05% total nitrogen, 878.20±0.00~1430.09±9.77 ㎎/100mL amino nitrogen and 419.10~1,025.50 ㎎/㎏ histamine, respectively. These findings suggest that the products of salt-fermented fish sauces have pretty much the same in ingredient composition and meet domestic criteria but most those had high biogenic amine contents. Therefore, ingredient composition and biogenic amine content of commercial salt-fermented fish sauce products were practicable evaluation of the quality characteristics.
프로세스 레벨의 병합 단위장치를 이한 IEC61850-9-2 샘플링 값 서비스 구현에 관한 연구
金官洙(Gwan-Su Kim),李弘熙(Hong-Hee Lee),金炳鎭(Byung-Jin Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.7
Recently, IEC61850 supports the standardized communication technique in both station bus and process bus, and presents the substation automation model. In this paper, we propose the required techniques to develop the Merging Unit (MU), which is one of the important data acquisition equipment in substation automation, under IEC61850 communication protocol. Especially, we also propose the precision time synchronization technique using GPS(Global Positioning System) for the MU. IEC61850-9-2 SV (Sampled Value) service is applied to the MU which is designed using microprocessor. In order to evaluate the performance of the proposed MU, the playback program, which can reconstruct the transmitted sampled value data on the basis of time information, is developed and the performance of the IEC61850 SV service for MU is verified experimentally.
IEC61850 Process Level에 적합한 Merging Unit 설계
김관수(Gwan-Su Kim),이홍희(Hong-Hee Lee),김병진(Beung-Jin Kim),박종찬(Jong-Chan Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
현재 변전소 자동화의 국제 표준으로 대두되고 있는 IEC 61850은 스테이션 버스 뿐만 아니라 프로세서 버스 까지도 표준화된 통신기술을 채용하였고 자동화에 필요한 모델을 제시하였다. 본 연구에서는 프로세서 버스의 대표적인 장비인 Merging Unit의 특성과 구현에 필요한 기술을 고찰하였다. 특히 정밀한 시간동기에 필요한 GPS(Global Positioning System)를 이용한 동기화 기술에 대하여 고찰하였다. 이와 더불어 IEC61850-9-2 SV(Sampled Value) 서비스를 분석하고 실제로 마이크로프로세서를 이용하여 Merging Unit에 대한 설계를 수행하였다. 제안된 Merging Unit의 성능을 검증하기 위해서 전송된 SV 데이터를 시간 정보를 기준으로 재구성할 수 있는 오실로그래피(Oscillography)를 위한 플레이백(Playback) 프로그램을 제작하였다.
Dithering기법에 의한 직접 토크 제어 방식의 토크리플 개선에 관한 연구
이홍희(H.H.Lee),김정현(J.H.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
This paper focuses on a simple technique to reduced torque ripple in the direct torque control inverter for PMSM drive. It is actually Impossible to raise the inverter switcing frequency in the conventional system, although the hysterisis bandwidths for the stator flux and torque control are sufficiently diminished, becauses of the sampling interval and the delay in estimating the flux and the torque In order<br/> to overcome the problem, the proposed method<br/> introduces a dithering technique into the conventional system by superposing triangular waves with high frequency and minute amplitude on the torque error. And the programable 3- stage lowpass filter is added instead of pure integrator. simulation results prove the feasibility of proposed strategy compared with conventional method
복수전동기 구동 시스템의 성능 향상을 위한 반복학습제어기 설계
이홍희(H.H.Lee),김정희(J.H. Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
Iterative learning control is an approach to improve the transient response of systems that operate repetitively over a fixed time interval. It is useful for the system where the system output follows the different type input, in case of design or modeling uncertainty. In this paper, we introduce the concept of iterative learning control and then apply the learning control algorithm for multi-motor system for performance improvement<br/>
프로피버스 기반 복수유도전동기의 멀티레이트 추정 및 제어
이홍희(H.H. Lee),김관수(G.S.Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
This paper presents a method for increasing controller performance through multirate state estimation for ac machines at a low velocity. The multirate controller outputs control desired speed at each measurement instant The simulation results show that the performance of multirate velocity estimation and control at low velocity is Improved than single rate one.<br/>