신재생에너지의 출력제한 개선을 위한 VPL의 경제성평가 모델링

노성은(Seong-Eun Rho),이민행(Min-Haeng Lee),김지명(Ji-Myung Kim),김경화(Kyung-Hwa Kim),김응상(Eung-Sang Kim),노대석(Dae-Seok Rho) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.10

최근, 제주도의 신재생에너지 전원이 제주도 발전용량의 약 20%까지 증가하여, 신재생에너지의 출력제한이 빈번하게 발생하고 있다. 그리고, 신재생에너지를 연계하기 위한 전력설비 인프라의 부족으로 인하여 신재생에너지가 접속대기 중에 있어, 신재생에너지의 접속지연 문제를 해결하기 위한 연구의 필요성이 증가하고 있다. 이러한 문제를 해결하기 위하여, 전력설비 인프라의 증설 및 신설이 요구되지만, 막대한 건설비용과 오랜 건설기간이 소요되므로 어려움을 겪고 있는 실정이다. 따라서, 본 논문에서는 전력설비를 추가로 증설하거나 신설하지 않고, 신재생에너지 전원의 연계지점이나 수용가 말단 등에 ESS를 운용하여, 전력계통을 관리하는 가상적인 전력선로 운용기술인 VPL(virtual power line) 운용모델을 제시하고, 이를 도입하기 위한 타당성을 평가하기 위하여 VPL의 경제성평가 방안을 제시한다. 여기서, 경제성평가 모델링은 크게 비용요소와 편익요소로 구성되며, 비용요소는 설치비용과 운용비용, 편익요소는 신재생에너지의 출력제한 개선과 전력설비 투자지연에 의한 편익으로 구성된다. 이를 바탕으로, 규모(소규모, 중규모, 대규모)별 VPL의 도입 모델에 대하여, 현재가치 환산법을 이용하여 경제성평가를 수행한 결과, VPL의 적정한 용량을 선정하면 기존의 인프라 투자보다 효과적임을 알 수 있다. Recently, the proportion of renewable energy sources in Jeju Island has increased to approximately 20% of the power generation capacity. However, power curtailment of renewable energy sources frequently occurs. Many renewable energy sources are also waiting to be connected due to the lack of power system infrastructure. To solve these problems, an investment in power system infrastructure is required due to the enormous costs and long period of construction. Therefore, this paper presents an operation method for VPL, which is virtual power line operation technology to manage the power system. This is done by operating an ESS installed at the coupling point of a renewable energy source and the last point of the primary feeder without expanding the power system infrastructure. We also propose an economic evaluation method to perform a feasibility study of a VPL. The economic evaluation method was modeled with cost and benefit factors. The cost factors consisted of construction and operation costs. The benefit factors were composed of improvement of pricing of power curtailment and the benefit of deferred investment in power system infrastructure. From the simulation results for VPL models at the small, medium, and large scale, it was confirmed that the proper capacity of a VPL can be more economical than the investment cost of the expansion of power system infrastructure in the conventional method.

신재생에너지 출력제한 개선을 위한 VPL의 최적용량 산정방안에 관한 연구

최성문,김지명,김윤호,유현상,유경상,노대석 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.11

The installation of renewable energy sources is rapidly being increased according to the basic roadmap for national greenhouse gas reduction by 2030 and the 10th Basic Plan for Long-Term Electricity. However, power curtailment of renewable energy sources frequently has occurred due to the imbalance between the power supply and the demand. To solve these problems, an investment in power facility infrastructure is required, which has enormous cost and a long period of construction. Therefore, this paper presents the operation characteristics of a VPL to improve the power curtailment of renewable energy sources and avoid investment in the power system infrastructure. We propose a method to calculate the optimal capacity of ESS for a VPL. An estimation method of optimal capacity is the minimum capacities of ESS (kW and kWh) are estimated based on the active power required to maintain voltages within the allowable limits for customers. The modeling of a VPL-connected distribution system was performed, which is composed of distribution substations, a VPL, a PV system, customer loads, and an energy prosumer using PSCAD/EMTDC S/W. The simulation results confirmed that the customer voltages are maintained within the allowable voltage limit according to the operation characteristics of a VPL. Therefore, power curtailment of renewable energy sources can be improved economically without investment in power facility infrastructure.

Regional Integrity Analysis using modernized GPS, Galileo and SBAS

Sang Sul Han,Dae Sik Shin,Jong Chul Cho,Chansik Park,Hyang-Sik Jun,Gi-Wook Nam,Sang Jeong Lee 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.1 No.-

ICAO defines performance requirements of navigation system such as accuracy, integrity, continuity and availability. The integrity is most significant performance requirement in aviation where safety of life is crucial. Many researches on this topic anticipate that GPS with SBAS or Galileo can meet APV requirements and GPS with GBAS or Galileo with GBAS will meet CAT II and III requirements. These performance expectations are based on global analysis. In this paper regional integrity analysis in Korea using various combinations of modernized GPS, Galileo and SBAS is given. The simulation results show that CAT I requirement can be met using modernized GPS and Galileo alone, however, CAT II and III are not met even augmenting SBAS because of VPL. A more efficient augmentation such as GBAS which can reduce VPL dramatically is required to meet CAT II and III in Korean region.

VPL을 통한 RDS 기반의 이동 로봇 원격제어

김선택,정슬 제어로봇시스템학회 2010 제어로봇시스템학회 국내학술대회 논문집 Vol.2010 No.5

출력제한 완화를 위한 대규모 VPL의 경제성평가에 관한 연구

김윤호,노성은,이민행,이예빈,노대석 대한전기학회 2023 대한전기학회 학술대회 논문집 Vol.2023 No.10-1

컴퓨터활용교육 : 프로그래밍 초보자를 위한 비주얼 기반의 C 프로그래밍 통합 환경

김행임 ( Haeng Im Kim ),박은경 ( Eun Kyoung Park ),김현주 ( Hyun Ju Kim ),배종민 ( Jong Min Bae ) 한국컴퓨터교육학회 2013 컴퓨터교육학회 논문지 Vol.16 No.6

프로그래밍 초보자는 C언어를 처음 배울 때 여러 가지 면에서 어려움을 겪는다. 그 이유 중의 하나는 C 언어 문법 이해에 대한 학생들의 학습 부담이 크고, 문제 해결보다는 문법에 치중하는 경향이 있다. 또한 소프트웨어 개발에 대한 흥미를 유발시킬 수 있는 프로그래밍 도메인이 필요하다. 본 논문에서는 문제 해결 중심의 C언어 교육을 지원하는 프로그래밍 환경을 제시한다. 이를 위하여 첫째, NXT 로봇 프로그래밍용 간단한 비주얼 프로그래밍 언어 Tiny-VPL을 정의하고, Tiny-VPL로 로봇프로그래밍을 할 수 있는 환경을 제시하며, 둘째 간단한 C 언어인 Mini-C언어를 사용하여 NXT 로봇 프로그래밍을 할 수 있는 환경을 제시한다. 그리고 Tiny-VPL을 Mini-C로 변환하며, 변환결과를 대화형으로 제공하는 그래픽 인터페이스를 제시한다. 개발된 프로그래밍 환경은 로봇 프로그래밍을 통하여 학생들의 흥미를 유발할 수 있고, 비주얼언어와 C언어 사이의 관계를 그래픽으로 제공하여 문제 해결 중심의 C 언어 교육에 효과적으로 활용될 수 있다. Programming novices have various difficulties when they learn C language for the first time. Novices have a large burden for understanding of a C language grammar, and have a tendency to focus on the grammar rather than problem solving. Moreover, it requires programming domains to arouse student`s interest for software development. This paper presents a programming environment for C languages education focusing on a problem solving. To this end, this paper defines Tiny-VPL that is a simple visual programming language for NXT robot programming and presents robot programming environment using Tiny-VPL. This paper also presents an environment for NXT robot programming using Mini-C language which is a subset of C language. For the purpose of helping to understand the C syntax and semantics, the visual and interactive conversion system of Tiny-VPL to Mini-C is provided. Our programming environment can arouse student`s interest through robot programming and can be used effectively for C language education focusing on problem solving with graphical and interactive conversion of the visual language Tiny-VPL to the textual language Mini-C.

Cocaine-induced Changes in Functional Connectivities between Simultaneously Recorded Single Neurons in the SI Cortex and the VPL Thalamus of Conscious Rats

Shin. Hyung-Cheul,Park. Hyoung-Jin,Oh. Yang-Seok,Chapin. John K. 대한생리학회 1993 대한생리학회지 Vol.27 No.1

The present study was carried out to determine the effects of cocaine (0.25, 1.0, 10.0 mg/kg, i.p.) on the interactions between spontaneously active neurons within ensembles of simultaneously recorded neurons in the primary somatosensory cortex (Sl, n= 20) and the ventroposterolateral (VPL, n= 16) thalamic nucleus of awake rats. Spike triggered cross correlation histograms were constructed between pairs of simultaneously recorded neurons. Among 101 neuronal pairs analyzed, 22.7% showed correlations indicative of various functional connections among the cortical cells, two corticothalamic interactions and one thalamocortical excitatory interaction. There were also 15 cofiring activities among SI cortical cells. These functional connectivities appeared to be modulated (weakened, abolished, or strengthened) during the 5 to 30 min following cocaine injection. The effects of saline were tested as a control, but it did not appear to alter the functional connectivities. In general, cocaine-induced changes of the functional interactions were mainly due to the concomitant alterations of the uncorrelated background discharges. These results suggest that the biphasic effects of cocaine on the spontaneously established neural networks among the SI cortical and the VPL thalamic cells of conscious rat were mainly indirect. However, various changes of the functional interactions by different doses of cocaine appeared to be a possible neural network mechanism for the cocaine induced modulation of afferent somatosensory transmission.

PSCAD/EMTDC를 이용한 VPL 모델링에 관한 연구

최성문,김경화,김윤호,이예빈,노대석 대한전기학회 2023 대한전기학회 학술대회 논문집 Vol.2023 No.10-1

DML(Diagram Markup Language) 시스템의 설계 및 구현

김성근,김영철,유재우,Kim Sung keun,Kim Young chul,Yoo Chae woo 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.3B

다이어그램은 직관성과 간결성을 갖는 장점이 있어 현재의 컴퓨팅 환경에서 많은 분야에 널리 사용되고 있다. 하지만 다이어그램 작성에 대한 표준화된 방법의 부재(不在)로 소프트웨어 상호간의 자료공유가 어렵고 다이어그램 컴포넌트와 규칙을 직접 프로그래밍 해야 하기 때문에 많은 시간과 노력을 필요로 한다. 이러한 문제점을 해결하고자 본 논문에서는 표준화된 문서규약인 XML을 이용해 다이어그램 컴포넌트의 형태와 행위를 정의하는 방법, 다이어그램의 규칙과 의미를 기술하는 방법에 대해 제안하고 제안한 XML 문서가 실행될 수 있는 다이어그램 시스템의 설계 및 구현에 관하여 논의한다. 본 다이어그램 시스템에서는 DML 그래픽 편집기를 제공하여 WYSWYG 방식으로 다이어그램 컴포넌트를 정의하고 자동으로 DML 문서를 생성할 수 있도록 함으로써 더욱 효율적으로 새로운 다이어그램을 개발할 수 있도록 하였다. 뿐만 아니라 DTD를 이용해 다이어그램에 대한 문법을 정의함으로써 문서의 구조를 정의하는 DTD에 대한 의미적 일관성을 유지하였으며 Semantic Definition XML을 이용하여 의미를 기술할 수 있도록 하였다. 또한 다이어그램 시스템에서 다이어그램 문장에 대한 문법검사와 의미실행의 방법은 VPL(Visual Programming Language)의 여러 개념들을 이용하였다. The diagram has a intuition and simplicity So, it is widely used in various fields in current computing environment. But, because of the absence of a standard diagram specification method, we have difficulty in exchanging the diagram data between different diagram software and besides, we spend much money and time to code diagram component, rules and semantics to which diagram would be applied. So We propose a method for defining diagram component's shapes and actions, diagram's rules and semantics using XML. And We design and implement the diagram system which execute XML document specifying diagram. In the diagram system, We can define diagram component in WISWIG manner and generate DML document automatically. So We can develop diagram system more efficiently. And by defining diagram rules using DTD, we also achieve the consistency of DTD meaning. And We propose Semantic Definition XML for specifying diagram semantics. So, diagram sentence which drawn by users could be given semantics and executed in diagram system. In this thesis, many VPL(Visual Programming Language) concepts were adopted to implement diagram system environment.

비주얼 프로그래밍 언어를 활용한 뇌파 기반 IoT 조도 제어 감성조명 제안

강세연(Kang, Se-Yeon),지승열(Ji, Seung-Yeol),전한종(Jun, Han-Jong) 대한건축학회 2019 대한건축학회 학술발표대회 논문집 Vol.39 No.1

Recently, Emotional-Lighting that reflects various human conditions has appeared with the development of the LED. Also with the development of advanced technology, the Brain Computer Interface(BCI) has received much attention due to its technology that can grasp the emotions of the user. However, in order to provide user-oriented lighting environment, an intelligent system based on emotional recognition that understands human thoughts is needed. The present paper presents a customized Emotion-based lighting control system that analyzes the user"s emotion according to illuminance and control lighting based on EEG. On the basis of this system, Real-time EEG data are visualized and compared using the Dashboard of Node-RED which is a development tool platform.