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구버전 IEC 플리커미터를 활용한 국내 배전 계통에서의 플리커 측정 방안에 관한 연구
신훈철(Hoon-Chul Shin),조수환(Soo-Hwan Cho) 대한전기학회 2019 전기학회논문지 Vol.68 No.3
IEC 61000-4-15, which was originally established to introduce the test and measurement methods of flickermeter for only 120V-60Hz and 230V-50Hz power systems in 1997, have been amended to the second edition in 2010. In the second revision, more test conditions and specifications have been added. The most significant change in the revision is the addition of test conditions for 120V-50Hz, 230V-60Hz and other system conditions. The flicker measurement standards for 100V-50/60Hz and 220V-50Hz systems can be converted from the existing reference cases of 120/230V and 50/60Hz, but unfortunately the 220V-60Hz system is not considered at all. This paper is written to introduce the flicker correction factor appropriately designed for Korean distribution power system, complying with the IEC flicker measurement standard. This correction factor can be effectively used when we would measure and assess flicker in the 220V/60Hz power system using old-version IEC flickermeters.
TEO&DESA를 활용한 Auto-synchronizer의 전압 파라미터 측정에 관한 연구
신훈철(Hoon-Chul Shin),한수경(Soo-Kyeong Han),유준수(Joon-Soo Lyu),조수환(Soo-Hwan Cho) 대한전기학회 2018 전기학회논문지 Vol.67 No.7
The Auto-synchronizer is essential equipment for synchronizing a generator to the power system. It is performing that measurement of the magnitude, frequency and phase of the voltage signal of the power system and generator. It is important to select the appropriate measurement algorithm for preventing various problem such as mechanical stress and Electrical problem. Teager Energy Operator(TEO) and Discrete separation algorithm(DESA) is measurable the instantaneous parameters of a sine wave using 5 samples and can be measured at a fast and with a simple operation. Therefore it has many advantages in measuring the parameters. In this paper, it confirmed measurement results using matlab simulations when there are synchronized in order of frequency, magnitude. Also it presented methods using digital filters and sample intervals to improve accuracy.
국내 계통 특성을 고려한 IEC61000-4-15 Edition 2 기반의 디지털 플리커 미터 알고리즘 구현 및 평가
신훈철(Hoon-Chul Shin),한수경(Su-Kyoung Han),박상호(Sang-Ho Park),김건중(Kern-Joong Kim),조수환(Soo-Hwan Cho) 대한전기학회 2017 전기학회논문지 Vol.66 No.7
The International Electrotechnical Commission(IEC) 61000-4-15 is a standard proposing techniques for a flicker meter test and measurement method. The IEC61000-4-15 ed1 announced in 1997 was not include tests for accurate verification. Also it was not explained flicker meter algorithm that can be directly applied to the other power systems. But the new edition of IEC61000-4-15 ed2 prescribes a variety of tests for verify flicker meter algorithm and it explains "correction factor" used for measuring flicker in other power systems. It can measure flicker severity in 220V system by multiplying correction factor to the measured values with the 230V algorithm. This paper compared the method of measuring flicker severity in korea power system using the correction factor and the modified weighting filter, after verifying of digital flicker meter algorithm created by using matlab based on IEC61000-4-15 ed2.
국내 특고압 고객에 대한 IEC 61000-3-7 기반의 플리커 방출한계 평가 및 관리 방안 연구
한수경(Su-Kyoung Han),신훈철(Hoon-Chul Shin),박상호(Sang-Ho Park),김건중(Kern-Joong Kim),조수환(Soo-Hwan Cho) 대한전기학회 2018 전기학회논문지 Vol.67 No.1
IEC 61000-3-7 provides guidance for limiting flicker and enabling the connection of fluctuating load installations, that is, producing flicker in MV, HV and EHV power systems. In Korea, the flicker have been restricted by Japanese standard of △V10 method. △V10 was developed only for arc furnaces in 1960’s. And now it is revealed that it is not suitable for application to other fluctuating load installations through many researches. Pst which is a flicker index used in IEC 61000-3-7, indicates visual inconvenience due to voltage fluctuation across large range of frequency and can be applied to fluctuating load installations as well as arc furnaces. In this paper, we introduce how to calculate and assess flicker emission level for the individual fluctuating load installations connected in EHV system and how to manage the emission levels in the power system according to IEC 61000-3-7.
카노모델을 이용한 스마트 트렁크 기능의 고객 만족에 관한 연구
김동연(Dong-Yeon Kim),신훈철(Hoon-Chul Shin) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.4
최근 자동차 산업은 차량의 전동화, 디지털화 및 자율 주행으로 대표되는 신기술 도입으로 급변하고 있다. 국내외 주요 자동차 회사는 성능 위주의 제품개발에서 UX(user interface)로 고객에게 특별한 경험과 가치를 제공하기 위해서 고객 만족에 대한 체계적인 접근을 시도하고 있다. 본 연구에서는 만족도에 대한 체계적이고 정성적인 연구방법으로 Kano 모델을 제안한다. 사례연구로 스마트 트렁크 시스템의 사용사례(use case)와 고객의 요구사양을 분석하여 17개의 기능(동작기능 3개, 안전기능 7개, 편의 기능 7개)을 정리하고 창의발상코드(creative ideation codes)를 이용하여 8개의 새로운 기능을 도출하였다. 그리고 기능별 고객이 느끼는 품질특성과 선호강도에 대한 과학적인 분석 방법을 제안하였다. 스마트 트렁크 기능에 대해 소비자가 느끼는 품질특성을 분석한 결과, 25개의 기능 중 18개는 매력적 품질특성, 3개는 일원적 품질특성 그리고 4개는 일원-당연 복합 품질특성으로 분류되었다. 그리고 일원적 품질특성과 일원-당연 복합 품질특성을 갖는 기능이 매력적 품질특성의 기능보다 상대적으로 고객선호도가 높다는 것을 확인하였다. 본 연구결과를 바탕으로 스마트 트렁크 시스템을 개발하는 기업은 고객의 불만을 최소화하고 고객 만족을 극대화할 수 있기를 기대한다. In recent years, the automobile industry has been facing a major change with the introduction of new technologies represented by autonomous driving, electrification, and digitalization. Major domestic and overseas automakers are trying to use a systematic approach to customer satisfaction through user interfaces to provide customers with a special experience and value beyond just making products with high performance. This study proposes the Kano model as a systematic and qualitative research method for satisfaction. As a case study, 17 functions of a product were sorted (3 operation functions, 7 safety functions, and 7 convenience functions). This was done by analyzing the use case and the customers’ requirements for a smart trunk system. 18 new functions were derived via creative ideation codes. In addition, a scientific analysis method is proposed for product quality attributes and the strength of customer satisfaction. Using the Kano methodology, 25 functions were classified into quality attributes: 18 attractive qualities, 3 one-dimensional qualities, and 4 complex qualities, which are combinations of one-dimension qualities and must-have qualities. The functions that have one-dimensional quality and complex qualities were found to have higher customer ratings than the functions that have attractive qualities. Based on this, enterprises could effectively reduce customer complaints and enhance customer satisfaction.