• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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• pp.1339-1342
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• 2005

This paper presents a simple AC-DC power conditioner for a squirell-cage induction generator(IG) operating under variable shaft speeds. The necessary reactive power for the IG system is supplied by means of a capacitor bank and a voltage-source PWM converter. Using a capacitor bank to transfer the reactive power to the IG under the rated speed and no-load conditions starts the IG operation and reduces the PWM power converter size. A simple control compensating for changes in the electrical loads as well as the variation in speed was developed to regulate the voltages of the IG system by controlling the rotor flux through its reactive and active currents control implementation. This proposed power conditioning scheme can be used efficiently as a wind power generation system where the output voltage of the IG is maintained constant voltage despite the variable frequency and the DC bus voltage of the PWM converter can be used for either DC applications such as battery charging or AC power applications with 60/50 Hz by connecting a stand alone inverter. The experimental and simulated operating performance results of a 5 kW IG scheme at various speeds and leads are presented.

• 한국전자통신학회논문지
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• 제8권2호
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• pp.249-253
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• 2013

본 논문에서는 그린 IT 분야에 대한 특허 정보를 이용하여 분야별 기술 경쟁력 분석과 분야에 적용되는 기술의 다양성 및 분야간 유사도를 분석하였다. 이를 위해 그린 IT를 전기 전자기들의 에너지소모량의 절감 및 IT기술을 기반으로 전력 소비를 줄이는 친환경적인 기술을 개발하는 분야로 범위를 한정하여, 절전기기 및 시스템, 조명제어시스템, 스마트 전력관리시스템, 클라우드 컴퓨팅, 그린하우스/에코시스템으로 한정하여 특허 분석을 수행하였다. 그 결과 절전기기 및 시스템 분야의 기술개발이 가장 활발히 이루어지고 있는 것으로 나타났다. 기술분야 간 기술적 유사도의 경우, 절전기기 제어 및 시스템분야와 클라우드 컴퓨팅 분야와 기술적으로 유사한 것으로 나타났으며, 조명제어시스템과 그린하우스/에코시스템 및 스마트 전력 관리 시스템이 기술적으로 유사한 것으로 분석되었다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.33-33
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• 2000

In this paper a new distributive control system for BA(Building Automation ) lighting control used on general microprocessors is presented. For optimal lighting control and saving energy, The system have to control the group and pattern lighting control as well as individual light control at one time. Tn this paper, This functions are accomplished with low-cost and simple microprocessor. A plurality of modulated light control terminals are connected to the central control unit through a pair of power line. This power line provide both power and signal to the each terminal and the data is transmitted through cyclic time division multiplex transmission. With this structure a low-cost distributive control system for lighting applications has been achieved, allowing energy and maintenance saving and reliability increase of the light control system.

• 한국전자통신학회논문지
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• 제10권7호
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• pp.787-792
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• 2015

본 논문은 건물 에너지 저감을 위하여 이기종 인터페이스를 통합한 스마트 게이트웨이, 웹서버 그리고 건물 에너지 관리 시스템 구현방법에 대하여 기술하였으며 제안된 시스템은 건물 내의 에너지 저감을 위하여 서비스 모델과 운영 알고리즘을 적용하여 최대전력과 전력사용량 감축방법을 소개한다.

• 한국인터넷방송통신학회논문지
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• 제14권5호
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• pp.153-159
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• 2014

본 논문에서 제안하는 이동에이전트를 이용한 분산형 절전제어 방법은 다수의 센서와 이동에이전트를 이용하여 능동적 지능적으로 조명장치의 제어(on/off 및 디밍 조절 등)를 가능하게 하여 에너지 절감에 효과적이며, 다양한 능동규칙들의 적용에 의한 원격감시 및 제어기능 추가가 용이하므로 효율적 절전제어시스템 설계 및 구축에 따른 비용절감 등의 효과를 유도한다. 또한, 이동에이전트 기반의 센서네트워크 미들웨어의 기능을 통하여 상황정보나 사용자의 감성 등을 규칙화하여 실시간으로 이벤트 처리 및 제어함으로써 센싱 데이터의 효용성을 향상시킨다. 본 논문의 결과는 다양한 능동적 센서네트워크 응용들의 개발에 있어 제안한 이동에이전트를 이용한 제어시스템의 활용가능성을 제시한다.

• 한국환경과학회지
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• 제12권4호
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• pp.503-510
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• 2003

How to plan the energy system is one of the keys f3r constructing the Environment -Friendly City. for this reason, a great number of surveys for utilizing unused energy have conducted by a planner. In regard to unused energy, the heat from incineration plants classify as a unused energy having high-exergy-energy. From this point of view, It is studied about the plant systems providing heat to district heating & cooling(D.H.C) and producing electric power. It is divided four system models as system I (10K [kgf/cm$^2$) vapor as outlet of boiler, supply far 10K vapor and return to 60$^{\circ}C$ as supply condition of district heating), system II (30 K vapor as outlet of boiler, supply for 5t vapor and return to 60f as supply condition of district heating), system 111 (30 K vapor as outlet of boiler, supply for 85$^{\circ}C$ hot water and return to 60$^{\circ}C$ as supply condition of district heating), system IV (30 K vapor as outlet of boiler, supply for 47$^{\circ}C$ hot water and return to 40t as supply condition of district heating). The results from the upper condition of four system, System II got a proper on economical benefits and system IV calculated as benefiting on energy saving effects, and suggest indifference curve as the total evaluation method of both economical benefits and energy saving.

• 전기학회논문지P
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• 제53권4호
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• pp.205-209
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• 2004

This research is investigated an energy saving system based on human detecting technique. It saves a lot of energy by automatic switching method of lighting, appliance, and so on. Existence of people on space is detected by infrared ray sensor. If there is not anybody during definite time, then main controller of system sends "power off" signal to lighting switches, and outlets. When people are detected again, turn on lighting switches and outlets. Result of this research is adaptable for classrooms and offices, and great effect of energy saving is expected.

• 대한조선학회논문집
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• 제49권5호
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• pp.376-383
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• 2012

Owing to rapid development of power device and inverters, most of submarines adopt an eletric propulsion system. Although PMPM(Permanent Magnet Propulsion Motor) propulsion system has relatively higher power, energy conversion efficiency and smaller volume than engine propulsion system, it also produces large amount of heat due to current flowing inside motor coils and change of magnetic field induced by iron core. The produced heat in stator and inverter largely affects motor efficiency and bearing lubrication and causes thermal aging while the system is on operation. So, we analyze the existing cooling system and submarine ESS (Energy Saving System) cooling system whose power consumption is reduced. HILS(Hardware In the Loop System) technique is used for the modelling of the submarine cooling system. To confirm the ESS cooling system characteristic, HILS is simulated using LabVIEW with hardware. As a result, the ESS cooling system has the characteristic of better temperature stability and less power consumption than the existing one.

• 전기학회논문지
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• 제64권5호
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• pp.779-785
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• 2015

Recently, home energy management system (HEMS) for power consumption reduction has been widely used and studied. The HEMS performs electric power consumption control for the indoor electric device connected to the HEMS. However, a traditional HEMS is used for passive control method using some particular power saving devices. Disadvantages with this traditional HEMS is that these power saving devices should be newly installed to build HEMS environment instead of existing home appliances. Therefore, an HEMS, which performs with existing home appliances, is needed to prevent additional expenses due to the purchase of state-of-the-art devices. In this paper, an intelligent inference algorithm for EMS at home for non-power saving electronic equipment, called legacy devices, is proposed. The algorithm is based on the adaptive network fuzzy inference system (ANFIS) and has a subsystem that notifies retraining schedule to the ANFIS to increase the inference performance. This paper discusses the overview and the architecture of the system, especially in terms of the retraining schedule. In addition, the comparison results show that the proposed algorithm is more accurate than the classic ANFIS-based EMS system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1473-1478
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• 2007

In the respect of energy saving and reusing, it is necessary to reduce greenhouse gases emission and to enhance the operation efficiency in electric railway system. Recently, as the power electronics technologies are advanced, some countries have focused on the regenerative inverter to use regeneration energy on each line. When the electric tractions are stopped or slowed down, it is useful to supply the surplus energy to the power source by regenerative system, which increases its energy efficiency. Also, the generated energy can be supply to other tractions or equipments inside traction. Thus, it may help reduce construction cost of additional power plants. The purpose of this study is to describe the development status of the regenerative inverter system which suppress extra DC-line voltage and regenerate the energy instead of using a resister.