• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.418-419
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• 2011

Recently, the korea power quality standard has been established based on the IEC Std. By IEC Std., the power quality assessment point is measured in PCC. In this case, the utility has to construct PQM system in all customer PCC point and the PQ meter cost would be very high in order to acquire the suitable data. Accordingly the utilities could not apply to PQM system in the distribution power system by the cost and communication problem. In this paper, the proposed economical PQMS(Power quality monitoring system) of Utility.

• Proceedings of the KIPE Conference
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• 2009.11a
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• pp.256-258
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• 2009

다양한 유무선 통신기술을 이용한 원격검침시스템 (AMR : Automatic Meter Reading)이 본격적인 사업단계에 들어섰으나, 인프라에 대한 기본적인 보안대책마저도 전무한 실정이다. 특히 외부 통신망을 이용할 경우 전력인프라의 보안취약성은 수많은 해커들의 표적이 되기에 충분하다. 이를 위해서는 각 기기들을 안전하게 인증, 관리하고 데이터를 보호해야 하지만 수많은 저사양 기기들을 원격으로 자동 인증, 관리하는 것은 쉽지 않다. 본 연구에서는 광범위 지역에 설치될 저사양 검침기기들을 자동으로 인증, 관리하며, 데이터보호 및 이를 위한 보안키 관리 메커니즘을 제시하고자 한다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.543_544
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• 2009

전력거래용 전력량계는 매 5분 단위로 발전기의 출력값에 대응하는 펄스값을 생성하여 저장 및 외부로 연계하는 기능을 수행한다. 현재 국내 전력시장에 도입된 전력량계는 5개종 900여대이며, 각 전력량계와 관련된 문서를 전력거래소에서 관리하고 있다. 이처럼 문서형태로 보관되는 자료를 데이터베이스로 구축하는 사업을 추진 중이며, 구축된 데이터베이스를 관리, 운영하기 위한 프로그램을 개발하고 있다. 본 논문에서는 회원사 계량설비와 관련된 자료를 데이터베이스화하고 이를 관리하기 위한 프로그램 개발에 대하여 소개하고자 한다.

• Proceedings of the KSRS Conference
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• 2007.10a
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• pp.591-593
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• 2007

This paper is to cluster the AMR (Automatic Meter Reading) data. The load survey system has been applied to record the power consumption of sampling the contract assortment in KEPRI AMR. The effect of the contract assortment change to the customer power consumption is determined by executing the clustering on the load survey results. We can supply the power to customer according to usage to the analysis cluster. The Korea a class of the electricity supply type is less than other country. Because of the Korea electricity markets exists one electricity provider. Need to further divide of electricity supply type for more efficient supply. We are found pattern that is different from supplied type to customer. Out experiment use the Clementine which data mining tools.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1848-1849
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• 2007

배전계통과 설비의 부하분석은 계측장치에 의존하여 왔으며, 대규모인 배전설비의 부하감시는 막대한 설치 및 유지보수 비용이 수반된다. 본 논문에서는 계측장치를 설치하지 않고도 정기적으로 취득되는 고객의 검침데이터를 이용하여 배전설비의 시간대별 부하분석 및 시뮬레이션을 수행할 수 있는 모델을 개발하고, 그 과정 및 결과를 제시한다. 이 모델은 고압고객의 원격검침 및 저압고객의 월검침 데이터를 구간계통에 적용하고 조류계산을 수행하여 15분 단위로 회선이하 구간 및 변압기의 부하를 분석할 수 있다. 또한, 특정 시점의 부하를 증감시키거나 다른 설비로 전환하여 시간대별 부하가 어떻게 변화하는지 시뮬레이션을 수행할 수 있다.

• The KIPS Transactions:PartA
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• v.19A no.3
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• pp.139-146
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• 2012

In the server cluster environment, one of the ways saving energy is to control server's power according to traffic conditions. This is to determine the ON/OFF state of servers according to energy usage of data center and each server. To do this, we need a way to estimate each server's energy. In this paper, we use a software-based power consumption estimation model because it is more efficient than the hardware model using power meter in terms of energy and cost. The traditional software-based power consumption estimation model has a drawback in that it doesn't know well the computing status of servers because it uses only the idle status field of CPU. Therefore it doesn't estimate consumption power effectively. In this paper, we present a CPU field based power consumption estimation model to estimate more accurate than the two traditional models (CPU/Disk/Memory utilization based power consumption estimation model and CPU idle utilization based power consumption estimation model) by using the various status fields of CPU to get the CPU status of servers and the overall status of system. We performed experiments using 2 PCs and compared the power consumption estimated by the power consumption model (software) with that measured by the power meter (hardware). The experimental results show that the traditional model has about 8-15% average error rate but our proposed model has about 2% average error rate.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.28 no.2
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• pp.92-99
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• 2014

The paper is related to smart maximum power system based on program logic. Especially, this system compares the total demand power with the target power by using the signal from the digital kilo watt meter. Based on the power information by the maximum power control equipment the consumed future power is anticipated. In addition, through consumed future power the controllable target power is set, and it applies on the maximum power control equipment. User or manager would control the load efficiently through the simple programming which could control load based on the control sequence and relay. To begin with the conventional maximum power control algorithm is surveyed, and the smart maximum power control system based on program logic is used, and the new algorithm from full load to proportion shut down is proposed by using PLC program. the validity of the proposed control scheme is investigated by both simulation results.

• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.1387-1390
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• 2005

Recently, foreign utilities emphasize the importance of the value-added services based on Information Technology(IT) as one of the strategic technologies for establishing a new power system in the future digital society. They develop many different types of the value-added services and apply the systems for customer. In domestic case, the data from the Automatic Meter Reading (AMR) System is used only for calculating the tariffs. Data from the AMR system can be strategic assets for utilities to provide the value-added services for customer. Development of the value-added services for utilities and customer needs processing and managing the AMR data. In this paper, the energy consulting service, which is adequate to new power system environment, is suggested for development of the value-added services. The application of the suggested service will bring the effect of reducing the monthly bill for customer. Also the service will give not only the effective demand side management(DSM) and load control, but also reduction of the investment for utilities.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1996.06a
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• pp.27-31
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• 1996

In this paper, The SSPA(Solid State Power Amplifier) is 100 watts amplifier which is used with C-Band Satellite communication Up-Link frequency, 5.875 ∼6.425 GHz. SSPA requires more output power than is available from a single GaAs FET with result it is necessary to combine the output of many device. To achieve a high power, it is important to make a good N-way power divider which has a small different phase, good combining efficiency and high power handling capability. The reliability of Power GaAs FET decrease with increasing junction temperature, power amplifier in general dissipate amount of power. It is important to provide them with a heatsink and a temperature compensation circuit to dispose of the unwanted heat. To compensate temperature, Using PIN diode attenuator, it is enable to get a precision gain control. The output power of the SSPA is more than 100 watt with which the TWTA (Traveling-Wave Tube Amplifier) can be replaced. Each stage was measured by the Network analyzer PH8510C, Power meter Booton 42BD, The gain is more than 53 dB, flatness is less than 1.5 dB.

• Proceedings of the KIEE Conference
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• 2006.04b
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• pp.365-368
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• 2006

The objective of this research is to investigate usage of 3KW photovoltaic-wind power hybrid generation system composed of 500W solar power generator and 400W wind power generator in a parallel circuit. In addition, solar radiation meter and wind monitor have been installed into each generation system to obtain the practical operating data that monitored in monthly, daily and hourly. These data that are independent to weather change and location would provide adequate generation output on average and cope with emergency situation in generation system In conclusion, based on this study, it could be considered for 3KW combined generation system to be gradually propagated to houses and small-size public facilities.