• Title/Summary/Keyword: Smart Grid

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Application of Smart Water Grid Water Circulation System Linked to Power Generation Industry (발전산업 연계 스마트워터그리드 물순환 시스템의 적용방안)

  • Jang, Dong Woo;Choi, Gye Woon;Park, Hyo Seon
    • Proceedings of the Korea Water Resources Association Conference
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    • 2018.05a
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    • pp.373-373
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    • 2018
  • 화력발전소, 석유화학공단 등 대규모 배출원에서 발생되는 이산화탄소를 활용하여 온실가스의 배출을 줄이고, 경제적 가치를 창출할 수 있는 탄소자원화는 기후변화 대응을 위한 국가전략프로젝트 중 하나이다. 전 세계적으로 탄소자원화 기술은 아직 상용화 단계이지만 최근 강화된 온실가스 감축 의무로 인하여 탄소자원화 시장은 더욱 확대될 전망이다. 화력발전소의 이산화탄소 발생 과정에서 배출되는 수증기는 응축기술을 통하여 새로운 수원으로 활용이 가능하다. 응축된 물의 최적 활용과 사용처 지향적 효율적 물순환을 위한 시설 내 스마트 워터 그리드(SWG) 개념의 물분배 시스템은 발전 산업 내에 탄소자원화의 핵심기술로 사용될 수 있다. SWG는 시설 내 용수공급 관리에서의 관망 운영, 물 수요 관리 등 ICT를 활용한 종합적인 물 분배 시스템으로, 본 연구에서는 SWG 물순환 시스템의 국내외 기술조사를 통해 발전 산업 시설 내에 적용성을 검토하였다. 물의 재이용 시스템을 포함한 SWG 기술, 지능형 관망 운영 기법 기술, 실시간 수질 감시 체계 기술 연구를 기반으로, ICT 기반 용수공급 정보 관리 기술과 수운영 모니터링 기술을 통하여 SWG가 발전 산업 연계 기술로써 적용될 수 있도록 하였다. 본 연구에서 제시된 SWG 시스템을 적용한 산업 인프라를 통하여 산업적 파급 효과를 높이고, 이를 활용한 인력과 비용 절감이 기대되며, 저에너지, 고효율화를 위한 기술력과 글로벌 물 시장진출 경쟁력을 향상시키기 위한 기초연구자료로써 활용이 가능할 것으로 기대된다.

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A low cost miniature PZT amplifier for wireless active structural health monitoring

  • Olmi, Claudio;Song, Gangbing;Shieh, Leang-San;Mo, Yi-Lung
    • Smart Structures and Systems
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    • v.7 no.5
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    • pp.365-378
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    • 2011
  • Piezo-based active structural health monitoring (SHM) requires amplifiers specifically designed for capacitive loads. Moreover, with the increase in number of applications of wireless SHM systems, energy efficiency and cost reduction for this type of amplifiers is becoming a requirement. General lab grade amplifiers are big and costly, and not built for outdoor environments. Although some piezoceramic power amplifiers are available in the market, none of them are specifically targeting the wireless constraints and low power requirements. In this paper, a piezoceramic transducer amplifier for wireless active SHM systems has been designed. Power requirements are met by two digital On/Off switches that set the amplifier in a standby state when not in use. It provides a stable ${\pm}180$ Volts output with a bandwidth of 7k Hz using a single 12 V battery. Additionally, both voltage and current outputs are provided for feedback control, impedance check, or actuator damage verification. Vibration control tests of an aluminum beam were conducted in the University of Houston lab, while wireless active SHM tests of a wind turbine blade were performed in the Harbin Institute of Technology wind tunnel. The results showed that the developed amplifier provided equivalent results to commercial solutions in suppressing structural vibrations, and that it allows researchers to perform active wireless SHM on moving objects with no power wires from the grid.

A Study on Transmission Efficiency of Wireless Power Induction and Resonant Charging Methodologies (무선 유도 및 공진 충전방식의 전송효율 연구)

  • Lho, Young Hwan
    • Journal of IKEEE
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    • v.23 no.2
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    • pp.747-750
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    • 2019
  • Wearable devices have become practically indispensable to daily life and helped people track and manage fitness, health, and medical functions etc. As these wearable devices become smaller and more comfortable for the user, the demand for longer run time and charging ways presents new challenges for the power management engineer. Wireless power transfer (WPT) is the technology that forces the power to transmit electromagnetic field to an electrical load through an air gap without interconnecting wires. This technology is widely used for the applications from low power smart phone to high power electric railroad and main electrical grid. There are two kinds of WPT methods: Inductive coupling and magnetic resonant coupling. The model using magnetic resonant coupling method is designed for a resonant frequency of 13.45 MHz. In this study, the hardware implementations of these two coupling methods are carried out, and the efficiencies are compared.

High Efficiency Strategy of High Input Voltage SMPS (고전압 입력용 SMPS의 고효율 전략)

  • Woo, Dong-Young;Park, Seong-Mi;Park, Sung-Jun
    • Journal of the Korean Society of Industry Convergence
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    • v.22 no.3
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    • pp.365-371
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    • 2019
  • Recently, the demonstration and research on the power transmission using high voltage DC such as HVDC(High Voltage DC), Smart Grid, DC transmission and distribution have been actively conducted. In order to control the power converter in high-voltage DC power transmission system, SMPS(Switching Modulation Power Supply) for power converter control using high-voltage DC input is essential. However, the demand for high-pressure SMPS is still low, so the development is not enough. In the low-output SMPS using the high-voltage input, it is difficult to achieve high efficiency due to the switching transient loss especially at light load. In this paper, we propose a new switching scheme for high power SMPS control for low output power. The proposed method can provide better efficiency increase effect in the light load region compared to the existing PWM method. To verify the feasibility of the proposed method, a 40 W SMPS for HVDC MMC(Modulation Multi-level Converter) was designed and verified by simulation.

Monitoring and control of wind-induced vibrations of hanger ropes of a suspension bridge

  • Hua, Xu G.;Chen, Zheng Q.;Lei, Xu;Wen, Qin;Niu, Hua W.
    • Smart Structures and Systems
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    • v.23 no.6
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    • pp.683-693
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    • 2019
  • In August 2012, during the passage of the typhoon Haikui (1211), large amplitude vibrations were observed on long hangers of the Xihoumen suspension Bridge, which destroyed a few viscoelastic dampers originally installed to connect a pair of hanger ropes transversely. The purpose of this study is to identify the cause of vibration and to develop countermeasures against vibration. Field measurements have been conducted in order to correlate the wind and vibration characteristics of hangers. Furthermore, a replica aeroelastic model of prototype hangers consisting of four parallel ropes was used to study the aeroelastic behavior of hanger ropes and to examine the effect of the rigid spacers on vibration mitigation. It is shown that the downstream hanger rope experiences the most violent elliptical vibration for certain wind direction, and the vibration is mainly attributed to wake interference of parallel hanger ropes. Based on wind tunnel tests and field validation, it is confirmed that four rigid spacers placed vertically at equal intervals are sufficient to suppress the wake-induced vibrations. Since the deployment of spacers on hangers, server hanger vibrations and clash of hanger ropes are never observed.

Solid Electrolyte Technologies for Next-Generation Lithium Secondary Batteries (차세대 리튬이차전지용 고체 전해질 기술)

  • Kim, K.M.;Oh, J.M.;Shin, D.O.;Kim, J.Y.;Lee, Y.G.
    • Electronics and Telecommunications Trends
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    • v.36 no.3
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    • pp.76-86
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    • 2021
  • Technologies for lithium secondary batteries are now increasingly expanding to simultaneously improve the safety and higher energy and power densities of large-scale battery systems, such as electric vehicles and smart-grid energy storage systems. Next-generation lithium batteries, such as lithium-sulfur (Li-S) and lithium-air (Li-O2) batteries by adopting solid electrolytes and lithium metal anode, can be a solution for the requirements. In this analysis of battery technology trends, solid electrolytes, including polymer (organic), inorganic (oxides and sulfides), and their hybrid (composite) are focused to describe the electrochemical performance achievable by adopting optimal components and discussing the interfacial behaviors that occurred by the contact of different ingredients for safe and high-energy lithium secondary battery systems. As next-generation rechargeable lithium batteries, Li-S and Li-O2 battery systems are briefly discussed coupling with the possible use of solid electrolytes. In addition, Electronics and Telecommunications Research Institutes achievements in the field of solid electrolytes for lithium rechargeable batteries are finally introduced.

Effcient Multicast Authentication Scheme for Smart Grid (스마트그리드에서의 효율적인 멀티캐스트 인증 기법)

  • Yu, Ji-Min;Kim, Ji-Hyun;Kim, Ho-Won
    • Proceedings of the Korea Information Processing Society Conference
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    • 2010.11a
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    • pp.1293-1296
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    • 2010
  • 오늘날 기존의 전력망에 IT가 융합되어 전력 공급자와 송배전 컨트롤러 사이에 정보 교환이 가능한 스마트그리드가 부각되고 있다. 스마트그리드 환경은 전력 공급자와 송배전 컨트롤러 사이의 정보 교환의 빈도가 높고, 정보 교환이 실시간으로 이루어 져야하는 특성을 가진다. 이러한 정보 교환이 주어진 시간 내에 정확하게 이루어지지 않거나 정보 교환 중에 공격자로 인해 악의적 변경이 일어나는 경우 대규모 정전이나 전력의 공급에 막대한 영향을 미치게 된다. 따라서 송신자 인증과 정보 교환 중에 정보의 악의적 변경이 이루어지지 않았다는 정보의 무결성 인증이 이루어 져야 하며, 이를 임계시간 이내에 처리할 수 있는 인증 프로토콜이 요구된다. 본 논문에서는 이러한 요구조건을 만족시키기 위해 타임-크리티컬(time-critical)한 특성을 가지면서 메세지 인증 기능을 제공하는 TV-HORS 멀티캐스트 인증 기법을 스마트그리드 시나리오에 적용하고, 이에 따른 문제점을 제시한 후, 이에 대한 해결책을 제시한다. 제안하는 방법은 키입력(keyed) 해쉬함수를 이용해 기존 TV-HORS 기법이 가지는 키 저장 문제를 효율적으로 해결한다.

Analyzing Technological Convergence for IoT Business Using Patent Co-classification Analysis and Text-mining (특허 동시분류분석과 텍스트마이닝을 활용한 사물인터넷 기술융합 분석)

  • Moon, Jinhee;Gwon, Uijun;Geum, Youngjung
    • Journal of Technology Innovation
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    • v.25 no.3
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    • pp.1-24
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    • 2017
  • With the rise of internet of things (IoT), there have been several studies to analyze the technological trend and technological convergence. However, previous work have been relied on the qualitative work that investigate the IoT trend and implication for future business. In response, this study considers the patent information as the proxy measure of technology, and conducts a quantitative and analytic approach for analyzing technological convergence using patent co-classification analysis and text mining. First, this study investigate the characteristics of IoT business, and characterize IoT business into four dimensions: device, network, platform, and services. After this process, total 923 patent classes are classified into four types of IoT technology group. Since most of patent classes are classified into device technology, we developed a co-classification network for both device technology and all technologies. Patent keywords are also extracted and these keywords are also classified into four types: device, network, platform, and services. As a result, technologies for several IoT devices such as sensors, healthcare, and energy management are derived as a main convergence group for the device network. For the total IoT network, base network technology plays a key role to characterize technological convergence in the IoT network, mediating the technological convergence in each application area such as smart healthcare, smart home, and smart grid. This work is expected to effectively be utilized in the technology planning of IoT businesses.

A Study on the Smart Home Safety Management System Based on NIALM (NIALM 기반의 스마트 홈 안전관리시스템에 관한 연구)

  • Jeong, Han-Sang;Sung, Kyung-Sang;Oh, Hae-Seok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.8
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    • pp.55-63
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    • 2017
  • Due to spatial problems and system size,conventional measurement methods used to acquire the information needed for existing electrical energy and management have been limited to new buildings or areas where replacement is possible. This electric load management method is problematic when applying it to energy and safety management of vulnerable areas or existing homes or offices. The problem with installing a measurement module in every branch is that the system is too large. Even if the measurement module is installed, the type of load is not recognized, and efficient management is not performed. In particular, it is very difficult to apply it to traditional markets and backward facilities in Korea. In this paper, we apply NIALM technology and arc detection technology to solve these problems and verify the feasibility of NIALM for normal arc generation. Also, based on the verification results, we propose a new smart home safety management system that can effectively manage electrical safety and that can be applied to conventional market and existing home safety management systems. The proposed system conducts a comparative performance test with an existing safety management system. In addition, it achieves 95% or more load recognition for four loads, which is impossible in 40% of the existing systems, and the arc detection function was confirmed.

A Study on the Safety Characterization Grounding Design of the Inner Photovoltaic System (태양광 발전단지 내부 그리드의 안전 특성화 접지 설계에 관한 연구)

  • Kim, Hong-Yong;Yoon, Suk-Ho
    • Journal of the Society of Disaster Information
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    • v.14 no.2
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    • pp.130-140
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    • 2018
  • Purpose: In this paper, we propose a design technique for the safety characterization grounding in the construction of the photovoltaic power generation complex which can be useful and useful as an alternative power energy source in our society. In other words, we will introduce the application of safety grounding for each application, which can improve and optimize the reliability of the internal grid from the cell module to the electric room in the photovoltaic power generation complex. Method: We analyze the earth resistivity of the soil in the solar power plant and use the computer program (CDEGS) to analyze the contact voltage and stratospheric voltage causing the electric shock, and propose the calculation and calculation method of the safety ground. In addition, we will discuss the importance of semi-permanent ground electrode selection in consideration of soil environment. Results: We could obtain the maximum and minimum value of ground resistivity for each of the three areas of the data measured by the Wenner 4 - electrode method. The measured data was substituted into the basic equation and calculated with a MATLAB computer program. That is, it can be determined that the thickness of the minimum resistance value is the most favorable soil environment for installing the ground electrode. Conclusion: Through this study, we propose a grounding system design method that can suppress the potential rise on the ground surface in the inner grid of solar power plant according to each case. However, the development of smart devices capable of accumulating big data and a monitoring system capable of real-time monitoring of seismic changes in earth resistances and grounding systems should be further studied.