• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.3
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• pp.59-64
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• 2020

In the Paris Climate Agreement, Korea submitted an ambitious goal of reducing the greenhouse gas emission forecast (BAU) by 37% by 2030. And as one of the countermeasures, a smart grid, an intelligent power grid, was presented. In order to apply the smart grid, EMS(Energy Management System) needs to be installed and operated in various fields, and the supply is delayed due to the lack of awareness of users and the limitations of system ROI. Therefore, recently, various data analysis and control technologies have been proposed to increase the efficiency of the installed EMS. In this study, we present a measurement control algorithm that analyzes and predicts big data collected by IoT using a SARIMA model to check and operate energy consumption of public sports facilities.

• Journal of IKEEE
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• v.22 no.3
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• pp.754-758
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• 2018

Analysis methods in the power system are static analysis, dynamic analysis and online analysis, offline analysis. The static analysis is used for the existing power system analysis method and the static analysis is mainly used for PSS / E. However, in the real system where the value changes in real time which we are using, dynamic analysis is required which can be analyzed in real time for accurate analysis. Therefore, attention is focused on EMS (Energy Management System) and importance is increasing. Among the various EMS systems, we will cover state estimation, which is a static on-line analysis that can receive and interpret data from the acquisition point in real time. DC systems are spreading in various fields such as DC load, DC distribution, renewable energy. As such, much attention and attention are focused on the DC system. In this paper, we have studied the feasibility through the case study and the interpretation of the state estimation that can be applied to the DC system.

• Journal of Software Engineering Society
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• v.24 no.3
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• pp.111-115
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• 2011

With the emergence of the smart grid era, the interest in green energy which reduce carbon emissions and environment-friendly smart grid which combines the advantages of power and IT technology is increasing around the world. To use the smart grid effectively heterogeneous systems such as EMS, MOS and WIS must be linked together. However, additional interface should be developed to link EMS and heterogeneous systems since IEC has only defines the interface for EMS. Especially, to link legacy system and new system, some software might need to be designed and developed because separate interfaces for connection can be developed depending on each system and environment. In this paper, we propose an integrated interface based on CIM for interconnection between systems. A proposed interface can integrate messages of heterogeneous system and will be able to reduce costs that could be incurred by the removal of the existing system and the addition of the new system.

• Journal of the Korean Society of Industry Convergence
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• v.22 no.5
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• pp.499-509
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• 2019

This paper discusses energy use monitoring and analysis as part of a study on a low-cost energy supply management system that links an existing database with weather information with no real-time monitor for energy demand of buildings using renewable energy, generator and energy storage systems. This study is targeted at small and medium-sized buildings and aims to monitor energy use with a small number of sensors at low cost by applying an energy management system (EMS). The present study can help overcome the limitations of high-cost EMS applied to large commercial and public buildings. We developed current, indoor temperature and human motion sensors and installed them in an office of a company in a sample building. Through these sensors, we analyzed energy use patterns and the effects of weather information and human motion on the energy use. Furthermore, we analyzed the correlations between the total KEPCO energy use of the sample building and weather by comparing these two data. The results showed that the office energy use of a company was more affected by human motions than by weather information. The comparison between the total energy use of the Building and weather information found that external temperature had an effect on the energy use.

• Smart Media Journal
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• v.7 no.4
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• pp.52-60
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• 2018

Energy Management System(EMS) of Microgrid(MG) collects and analyzes data from devices in the microgrid to provide information to operators, users and other systems. In the middle of the process, it is required to securely provide information through both wired and wireless communication networks. In this paper, we design and implement a module that provides encryption and decryption, key management, key distribution, and message authentication functions, thus enabling the development of a system which is safe from the exposure and modulation of data potentially occurrable during data transmission between RTU(Remote Terminal Unit) and EMS. Our method can increase the efficiency of connection and key management for RTU by connecting a virtual device(VD) to RTU.

• KEPCO Journal on Electric Power and Energy
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• v.6 no.3
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• pp.279-284
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• 2020

This paper presents the conceptual design of a cooperative control with Energy Management System (EMS) and Distribution Management System (DMS). This control enables insufficient reactive power reserve in a power transmission system to be supplemented by surplus reactive power in a power distribution system on the basis of the amount of the needed reactive power reserve calculated by the EMS. This can be achieved, because increased numbers of microgrids with distributed energy resources will be installed in the distribution system. Furthermore, the DMS with smart control strategy by using surplus reactive power in the distribution system of the area has been gradually installed in the system as well. Therefore, a kind of hierarchical voltage control and cooperative control scheme could be considered for the effective use of energy resources. A quantitative index to evaluate the current reactive power reserve of the transmission system is also required. In the paper, the algorithm for the whole cooperative control system, including Area-Q Indicator (AQI) as the index for the current reactive power reserve of a voltage control area, is devised and presented. Finally, the performance of the proposed system is proven by several simulation studies.

• Proceedings of the KIEE Conference
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• 2008.11a
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• pp.258-260
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• 2008

전력계통 규모가 대형화, 복잡화됨에 따라 전력계통의 안정적 운용과 양질의 전력공급을 보장하기 위해 EMS(Energy Management System)를 사용, 에너지 시스템 운용에 있어 안정적, 효과적 제어를 기하고 있다. 그러나 전력감시제어설비(SCADA)로부터의 실시간 데이터 누락, 또는 측정데이터의 오류가 발생할 경우 시스템상의 가관측성이 확보되지 않게 되어 상태추정이 불가능 할 수 있다. 이에 상태추정의 가관측성을 제공하기 위해 현재 한국형 EMS (K-EMS : Korea Energy Management System)의 응용프로그램 중 하나인 BLF(Bus Load distribution Factor) 산정 프로그램을 개발중에 있으며, 본 논문에서는 BLF 산정 프로그램을 통한 가관측성 확보방안과 프로그램에 대한 알고리즘에 대해 설명하고자 한다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.217_218
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• 2009

본 논문에서는 한국형 에너지관리 시스템(energy management system, EMS)의 프로토타입(prototype) 네트웍 해석 프로그램의 개발에 대해 요약하였다. 2005년부터 수행되어온 한국형 EMS 개발은 2008년 베이스라인(baseline) 개발을 완료한 상태이며 올해부터 프로토타입 개발 및 실증시험을 수행중에 있다. 한국형 EMS 프로토타입 네트웍 해석 소프트웨어는 베이스라인 개발 프로그램의 기능 보강과 더불어 상정사고 해석(contingency analysis), 전압 계획(voltage scheduler) 및 송전가능용량계산(transmission transfer capability)등으로 구성되어 있다. 본 논문에서는 각 개발 프로그램의 개략적 기능을 소개하고 전체적인 프로토타입 시스템의 구성에 대해 요약하였다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.2
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• pp.242-247
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• 2010

This paper introduces a real-time load flow program for Korean energy management system(EMS). This study is concentrated on the following aspects. First, we propose the model of the real-time database and power system equipment for the real-time load flow. These models are extracted from the needs of load flow functions and are designed to the application common information. Second, several techniques are applied for the efficient convergence and computational speed. The generation/load mismatch is redistributed using generator participation factors which are separated to the reference bus. For the voltage control, the jacobian matrix is composed with the basic Y matrix elements and the voltage control elements. Through the optimally ordering, jacobian row and column for a column is changed. However all jacobian matrix entries have same order with the Y matrix. The proposed program is tested using the Korea Electric Power Corporation(KEPCO) system. Through the test, we verified that the proposed program can be effectively used to accomplish the Korean EMS system.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.1707-1710
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• 2015

Energy Management System(EMS)는 전력 시스템에서 운영자에 의해 발전과 송전의 성능을 감시 제어 그리고 성능 최적화를 위하여 운영하는 시스템이다. 본 연구에서는 EMS(Next Generation Energy management System : NG-EMS)에서 클라이언트의 운영 시스템 자동 동기방법 및 웹 기반 온라인에서 뷰어를 실행, 운영하는 방법을 제안 한다. 본 연구는 인트라넷 망에서 클라이언트 운영 시스템의 효율적인 유지보수를 위하여 소프트웨어 패치 및 엔지니어링을 통해 도출된 그래픽 화면을 다수의 클라이언트에 자동 동기, 갱신하는 기능을 특징으로 한다. 또한 자동 동기 빌더를 사용하여 클라이언트에 동기 할 항목을 패키징하는 기능도 포함하고 있다. 자동 동기 서버 측에서는 본 연구의 구성에 의해 클라이언트의 동기 및 갱신 주기를 효율적으로 관리한다. 클라이언트가 메인서버로 접속할 시 자동동기 상태를 체크하는 서버에 문제가 발생했을 경우 다중 동기 서버 형태로 운영하여 불시 장애 발생에 효율적으로 대처가 가능하다. 또한 자동동기 시스템을 적용한 웹 기반 온라인 뷰어의 운영 시스템 및 방법을 제안한다.