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고병수(Byeong Soo Go),성해진(Hae Jin Sung),박민원(Minwon Park),유인근(In Keun Yu) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.8
In this paper, characteristics of a tidal current power generation system are analysis using power hardware-in-the-loop simulation (PHILS). A 10 kW motor generator set is connected to the real grid through a fabricated 10 kW back to back converter. A power control scheme is applied to the back to back converter. A 2 MW class tidal current turbine is modeled in real time digital simulator (RTDS). Generating voltage and current from the 10 kW PMSG is applied to a 2 MW class tidal current turbine in the RTDS using PHILS. The PHILS results depict the rotation speed, power coefficient, pitch angle, tip-speed ratio, and output power of tidal current turbine. The PHILS results in this paper can contribute to the increasing reliability and stability of the tidal current turbines connected to the grid using PHILS.
유인근 ( In-geun Yu ),박나정 ( Na-jeong Park ),이호경 ( Ho-kyung Lee ),백승민 ( Seung-min Beak ),김우석 ( Woo-suk Kim ),곽윤근 ( Yoon-keun Kwak ),김성기 ( Sung-ki Kim ) 한국폐기물자원순환학회(구 한국폐기물학회) 2021 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2021 No.-
고강도 철근콘크리트 부재의 경우 일반콘크리트에 비해 시공성이 낮으며, 품질관리의 어려움, 화재시 고온으로 인한 내화성능 저하로 인해 구조 안전성이 요구되는 실정이다. 이것은 고강도 콘크리트의 파괴양상이 매우 취성적이며, 국부적인 파괴를 일으키기 때문이다. 콘크리트의 파괴를 일으키는 원인으로서는 전단철근비, 인장 철근비, 전단경간비, 콘크리트 압축강도, 보의 폭 대 깊이 비 등이 있으며, 이들은 서로 상호복합작용으로 인하여, 콘크리트 전단강도의 정확한 전단설계값 및 파괴를 예측하지 못하므로 기존의 전단강도 식들은 충분한 안전율을 확보하기 위하여 보수적인 값을 제시하고 있다. 본 연구에서는 고강도 철근콘크리트보의 전단강도 특성을 연구하기 위해 콘크리트압축강도( = 50 MPa), 인장철근비(ρ=0.025) 및 폭 대 깊이비(h/b)를 일정하게 하였으며, 보의 크기(b×d)와 전단철근간격(d/s)을 변수로 한 12개의 시험체를 제작하여 실험을 하였다. 시험체는 단면의 크기에 따라 SHR1, SHR2, SHR3으로 된 총 3개의 시리즈로 나누었으며, 각 시리즈 당 전단철근의 간격에 따라 4개씩 총 12개의 시험체를 제작하였고, 시험체의 전단파괴를 유도하기 위하여 전단경간비는 2.5로 하였다. 실험값에 대한 여러 기준식 및 제안식과의 비교를 한 결과, 평균값은 1.15 ~ 1.60, 표준 편차는 0.13 ~ 0.18로 나타났다. 여러 기준식 및 제안식들 중 실험값을 비교적 잘 예측하고 있는 것은 Zsutty, Bazant, Lee 식이다. Zsutty 방정식의 평균은 1.29, 표준 편차 0.16, Bazant 방정식의 평균은 1.15, 표준 편차는 0.17, Lee 방정식의 평균은 1.17, 표준 편차는 0.18로 나타났다.
이동한(Dong-han Lee),이석주(Sukju Lee),김종현(Jonghyun Kim),박민원(Min-won Park),유인근(In-Keun Yu) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
In this paper an integrated model of PV-AF (Photovoltaic-Active Filter) and PV-SPE (Photovoltaic Solid Polymer Electrolyte) system using PSCAD/EMTDC were explained in detail. The main concept of PV-AF system starts from the "harmonics". In order to deliver power to utility, PV system essentially needs a converter system. Here PV-AF system adds the function of active filter to the converter system installed in PV system, which was introduced already in several papers. PV-SPE system has been studied as a replacement of existing hydrogen production technology that emits large amount of carbon dioxide into atmosphere. Until now, these two systems, PV-AF and PV-SPE, have been considered separately. However, in this paper, characteristics and advantages of combined system are discussed in detail.
PV-SPE 시스템을 위한 새로운 MPPT 제어의 운전특성 분석에 관한 연구
최종호(Choi, Jong-Ho),이동한(Lee, Dong-Han),김종현(Kim, Jong-Hyun),김재호(Kim, Jae-Ho),박민원(Park, Min-Won),유인근(Yu, In-Keun) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
In the newly developed control method, the current flowing into SPE cell is the only one considerable factor. So, the structure of control circuit becomes simple and the manufacturing cost of the control device decreases. In conventional power comparison MPPT control method however, a voltage and current coming out from PV cell should be feedbacked to chase maximum power point at every moment. Then, the structure of control circuit becomes so complex and the risk of control failure is much higher than the novel MPPT control method. Therefore, PV generation system by a novel MPPT control method is especially operated much more safely in case of a huge system, because the voltage coming out from PV-cell is not needed to be feedbacked. In this paper, the PV-SPR system was actually manufactured based on the simulation model of PSCAD/EMTDC program and the results tested were shown. Authors are sure that it is the most useful method to maximize power from PV to SPE with only a feedback of SPE input current.
Hardware-Based Implementation of a PIDR Controller for Single-Phase Power Factor Correction
Le Dinh Vuong(레딘브엉),Sang-Min Park(박상민),In-Keun Yu(유인근),Minwon Park(박민원) 한국산업정보학회 2016 한국산업정보학회논문지 Vol.21 No.4
In a single-phase power factor correction (PFC), the standard cascaded control algorithm using a proportional-integral-derivative (PID) controller has two main drawbacks: an inability to track sinusoidal current reference and low harmonic compensation capability. These drawbacks cause poor power factor and high harmonics in grid current. To improve these drawbacks, this paper uses a proportional-integral-derivative-resonant (PIDR) controller which combines a type-III PID with proportional-resonant (PR) controllers in the PFC. Based on a small signal model of the PFC, the type-III PID controller was implemented taking into account the bandwidth and phase margin of the PFC system. To adopt the PR controllers, the spectrum of inductor current of the PFC was analyzed in frequency domain. The hybrid PIDR controller were simulated using PSCAD/EMTDC and implemented on a 3kW PFC prototype hardware. The performance results of the hybrid PIDR controller were compared with those of an individual type-III PID controller. Both controllers were implemented successfully in the single-phase PFC. The total harmonic distortion of the proposed controller were much better than those of the individual type-III PID controller.
Design and manufacture of HTS current lead for 10kJ SMES
박해용(Hae-Yong Park),김광민(Kwang-Min Kim),김대원(Dae-Won Kim),김아롱(A-Rong Kim),박민원(Minwon Park),유인근(In-Keun Yu),김석호(Seok-Ho Kim),심기덕(Kideok-Sim),손명환(Myung-Hwan Sohn) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
In superconducting magnetic energy storage (SMES) systems, the current leads are usually divided into two parts. Normal metals like brass or copper are often used in the first part from the room temperature to the 1st stage of the cryocooler. Their dimensions were decided to minimize the conduction heat penetration and Ohm's heat generation. The second part down to the cryogenic coil is made of high temperature superconductor (HTS). HTS current leads can reduce the conductive heat penetration because they have poor thermal conductivity and generate no Ohm's heat generation. The brass current lead and the HTS current lead were designed and fabricated for application to the 10kJ class SMES system. The HTS current lead is 300A class. The HTS current lead was stacked with 2 HTS layers using the Bi2Sr2Ca2Cu3Ox (BSCCO) /Ag. In this paper, we introduce the design procedure of the current leads and discuss the test results of the current leads.
Industrial load forecasting using the fuzzy clustering and wavelet transform analysis
유인근,Yu, In-Keun Institute of Korean Electrical and Electronics Eng 2000 전기전자학회논문지 Vol.4 No.2
This paper presents fuzzy clustering and wavelet transform analysis based technique for the industrial hourly load forecasting fur the purpose of peak demand control. Firstly, one year of historical load data were sorted and clustered into several groups using fuzzy clustering and then wavelet transform is adopted using the Biorthogonal mother wavelet in order to forecast the peak load of one hour ahead. The 5-level decomposition of the daily industrial load curve is implemented to consider the weather sensitive component of loads effectively. The wavelet coefficients associated with certain frequency and time localization is adjusted using the conventional multiple regression method and the components are reconstructed to predict the final loads through a five-scale synthesis technique. The outcome of the study clearly indicates that the proposed composite model of fuzzy clustering and wavelet transform approach can be used as an attractive and effective means for the industrial hourly peak load forecasting.