• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.347-349
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• 2005

This paper presents the results of an investigation and assessment of the direct short term impacts of electric service interruption incurred by livestock customers. The study used a direct visit survey to determine the customer assessment of electric service interruption and characteristic. The variation in interruption cost with the characteristics of interruptions such as duration, time of day, frequency, and day of interruption was also investigated.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.350-352
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• 2005

This paper presents the results of an investigation and assessment of the direct short term impacts of electric service interruption incurred by public customers. The study used a direct visit survey to determine the customer assessment of electric service interruption and characteristic. The variation in interruption cost with the characteristics of interruptions such as duration, time of day, frequency, and day of interruption was also investigated.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 A
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• pp.141-143
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• 2004

This paper presents the results of an investigation of the direct short term impacts of electric service interruption incurred by agriculture customers. The study used a direct visit survey to determine the customer assessment of electric service interruption and characteristic. The variation in interruption cost with the characteristics of interruptions such as duration, time of day, frequency, and day of interruption was also investigated.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 A
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• pp.144-146
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• 2004

This paper presents the results of an investigation of the direct short term impacts of electric service interruption incurred by fisheries customers. The study used a direct visit survey to determine the customer assessment of electric service interruption and characteristic. The variation in interruption cost with the characteristics of interruptions such as duration, time of day, frequency, and day of interruption was also investigated.

• 전기학회논문지
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• 제63권2호
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• pp.205-210
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• 2014

The micro grid considered in this paper consists of a diesel generator, a photovoltaic array, a wind turbine, a fuel cell, and a energy storage system. This paper explains and simulates the micro grid components in terms of accuracy and efficiency of having a system model based on the costs of fuel as well as operation and maintenance. For operational efficiency, the objective function in a diesel generator consists of the fuel cost function similar to the cost functions used for the conventional fossil-fuel generating plants. The wind turbine generator is modeled by the characteristics of variable output. The optimization is aimed at minimizing the cost function of the system while constraining it to meet the customer demand and safety of micro grid. The operating cost in fuel-cell system includes the fuel costs and the efficiency for fuel to generate electric power. To develop the overall system model gives a possibility to minimize of the total cost of micro grid. The application of optimal operation can save the interruption costs as well as the operating costs, and improve reliability index in micro grid.

• 조명전기설비학회논문지
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• 제19권1호
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• pp.124-129
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• 2005

최근의 전기사업은 전력산업 구조개편과 맞물려 전력계통의 공급신뢰도가 큰 문제로 대두되고 있다. 또한 에너지-산업 간의 경쟁 심화로 공급자 측에서의 공급신뢰도와 관련된 환경조건 변화가 고려되어야 한다. 즉 다른 에너지와의 요금 격차로 인해 수용가가 전력에너지를 타 에너지로 변환할 가능성이 있어 전력공급 신뢰도의 일률적 향상은 반드시 필수적인 전략이라고 말할 수 없기 때문에 이와 같은 문제점에 효율적으로 대처하기 위해서는 수용가의 공급신뢰도와 정전비용에 대한 반응을 감지할 필요가 있다. 따라서 본 논문에서는 이와 같은 대내외적인 환경에 대처하기 위해 매크로 접근방법을 이용하여 국내 각 지역별로 수용가 정전비용을 년도별로 평가하였다. 즉 각 시도별로 공공용, 서비스업, 농림${\cdot}$어업, 광업, 제조업, 주택용 수용가에 대해 수용가 정전비용과 전기요금 단가에 대한 비율을 평가하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
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• pp.95-96
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• 2006

As the power industry moves towards open competition, there has been a call for methodology to evaluate distribution power system reliability by using customer interruption costs. Accordingly, it is increased for methodology to evaluate distribution power system reliability in power supply zones under competitive electricity market. This paper presents algorithm to evaluate system average interruption duration index. expected energy not supplied and system outage cost taking Into consideration failure rate of distribution facility and industrial customer interruption cost. Also, to apply this algorithm to evaluate system outage cost presented in this paper, distribution system of a dual supply system consisting of mostly high voltage customers in industrial complex in Korea is used as a sample case study. Finally, evaluation results of system interruption cost, system average interruption duration index and expected energy not supplied in sample industrial complex area are shown in detail.

• 조명전기설비학회논문지
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• 제20권10호
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• pp.172-177
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• 2006

본 연구에서는 배전계통의 부하지점의 부하형태에 따른 정전비용의 영향을 고려하여 분산전원을 설치함으로써 운영비용 및 정전비용을 최소화하는 방안을 제안하였다. 가정용, 산업용, 상업용, 사무용 및 농업용 등 부하형태를 실제 계통과 유사하게 고려함으로써 정확한 신뢰도 지수와 운영비용을 구할 수 있고, 이를 통해 총 운영비용 최소화에 더욱 접근할 수 있다. 특히 정전시 각 부하지점에 설치된 분산전원에 의해 전력이 공급되어 전력구입 비용과 정전비용의 경우 효과적으로 감소됨을 알 수 있었으며, 정전빈도와 정전시간이 감소되어 전력 공급률이 향상되어 신뢰도 지수가 좋아졌음을 알 수 있었다.

• 조명전기설비학회논문지
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• 제22권5호
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• pp.13-20
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• 2008

과거에는 순간전압강하(Sag)나 고조파(Harmonics)와 같은 순간전력품질 문제가 부하에 큰 영향을 미치지 않았으나, 최근 컴퓨터와 같은 마이크로 프로세서를 이용하는 민감부하의 사용 증가로 인하여 전력품질에 대한 관심이 고조되고 있다. 이에 따라 현재까지 영구정전(Sustained Interruption)에 초점을 맞추고 일부 순간정전(Momentary Interruption)을 포함하여 진행되어 온 배전계통 신뢰도 연구 분야는 새로운 전환점을 맞이하고 있다. 즉, 전력품질문제로 인하여 많은 민감기기들이 트립(Trip)되어 신뢰도 비용이 발생하기 때문에, 전력품질을 고려하지 않은 신뢰도 비용평가는 그 정확도가 떨어질 수밖에 없는 실정에 있다. 본 논문에서는 배전계통 사고 시 이 사고를 제거하기 위해 사용된 리클로져에 의해 발생하는 순간전압강하를 고려하였다. 기존의 영구정전에 의한 신뢰도 비용과 순간전압강하에 의해 트립되는 기기들의 신뢰도 비용을 포함하는 개선된 배전계통 신뢰도 비용 평가 기법을 제안하였다.

• 한국초전도ㆍ저온공학회논문지
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• 제19권4호
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• pp.40-44
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• 2017

This paper analyzed the fault current limiting characteristics of the previously proposed transformer superconducting fault current limiter (TSFCL) interruption system according to its transformer type. The TSFCL interruption system is an interruption technology that combines a TSFCL, which uses a transformer and a superconductor, and a mechanical DC circuit breaker. This technology first limits the fault current using the inductance of the transformer winding and the quench characteristics of the superconductor. The limited fault current is then interrupted by a mechanical DC circuit breaker. The magnitude of the limited fault current can be controlled by the quench resistance of the superconductor in the TSFCL and the turns ratio of the transformer. When the fault current is controlled using a superconductor, additional costs are incurred due to the cooling vessel and the length of the superconductor. When the fault current is controlled using step-up and step-down transformers, however, it is possible to control the fault current more economically than using the superconductor. The TSFCL interruption system was designed using PSCAD/EMTDC-based analysis software, and the fault current limiting characteristics according to the type of the transformer were analyzed. The turns ratios of the step-up and step-down transformers were set to 1:2 and 2:1. The results were compared with those of a transformer with a 1:1 turns ratio.