• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.20 no.5
• /
• pp.78-84
• /
• 2006

As electric power systems have been moving from a vertically integrated structure to a deregulated environment, calculating reactive power service charges is a new challenging theme for market operators. This paper examines various methods for reactive power management adopted in some deregulated foreign and domestic markets and then proposes a new method to calculate reactive power service charges using a reactive power market. The reactive power market is operated based on bids from the generating sources and is settled on uniform prices by running reactive OPF programs after the day-ahead electricity market. The proposed method takes into account recovering not only the costs of installed capacity but also the lost opportunity costs incurred by reducing active power output to increase reactive power production. A numerical sample study is carried out to illustrate the processes and appropriateness of the proposed method.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2019.10a
• /
• pp.574-577
• /
• 2019

국내 에너지 생산량의 고갈과 더불어 태양열, 풍력 등이 지속적 가능한 신재생 대체 에너지로 떠오르는 것과 더불어 가정에서 직접 전력을 생산하는 전력생산시스템이 주목을 받고 있다. 이를 위한 정부의 정책으로 태양광 패널을 이용하여 전력을 생산하고 이를 이웃 간의 전력 거래를 할 수 있는 실증사업을 실시하였다. 본 논문에서는 이 실증 사업에서 보안성과 안정성을 높이고 빠른 거래가 가능한 블록체인 기반 P2P 전자거래 시스템을 설계하고, 이를 통해 신재생 에너지 거래 시스템 개발 기술의 기술 사업화 과정에서 발생할 수 있는 경제적 리스크를 최소화할 수 있는 기틀을 마련한다.

• Journal of the Korea Society of Computer and Information
• /
• v.17 no.1
• /
• pp.211-218
• /
• 2012

Fossil fuel is used all over the world and it produces greenhouse gases due to fossil fuel use. Therefore, it cause global warming and is serious environmental pollution. In order to decrease the environmental pollution, we should use renewable energy which is clean energy. Among several renewable energy, wind energy is the most promising one. Wind power generation is does not produce environmental pollution and could not be exhausted. However, due to wind power generation has irregular power output, it is important to predict generated electrical energy accurately for smoothing wind energy supply. There, we consider use ramp characteristic to forecast accurate wind power output. The ramp increase and decrease rapidly wind power generation during in a short time. Therefore, it can cause problem of unbalanced power supply and demand and get damaged wind turbine. In this paper, we make prediction models using power ramp rate as well as wind speed and wind direction to increase prediction accuracy. Prediction model construction algorithm used multilayer neural network. We built four prediction models with PRR, wind speed, and wind direction and then evaluated performance of prediction models. The predicted values, which is prediction model with all of attribute, is nearly to the observed values. Therefore, if we use PRR attribute, we can increase prediction accuracy of wind power generation.

• Korean Chemical Engineering Research
• /
• v.56 no.5
• /
• pp.655-662
• /
• 2018

To respond effectively to climate change following the launch of the new climate system, the government is seeking to expand the use of distributed power resources. Among them, the district heating system centered on Combined Heat and Power (CHP) is accepted as the most realistic alternative. On the other hand, the government recently announced the change of energy paradigm focusing on eco-friendly power generation from the base power generation through $8^{th}$ Basic Plan for Long-term Electricity Supply and Demand(BPE). In this study, we analyzed the quantitative effects of profit and loss on the CHP operating business by changing patterns of the heat production, caused by the change of energy paradigm. To do this, the power market long-term simulation was carried out according to the $7^{th}$ and $8^{th}$ BPE respectively, using the commercialized power market integrated analysis program. In addition, the CHP operating model is organized to calculate the power and heat production level for each CHP operation mode by utilizing the operating performance of 830MW class CHP in Seoul metropolitan area. Based on this, the operation optimization is performed for realizing the maximum operating profit and loss during the life-cycle of CHP through the commercialized integrated energy optimization program. As a result, it can be seen that the change of the energy paradigm of the government increased the level of the ordered power supply by Korean Power Exchange(KPX), decreased the cost of the heat production, and increased the operating contribution margin by 90.9 billion won for the 30 years.

• Journal of Sericultural and Entomological Science
• /
• v.22 no.2
• /
• pp.13-21
• /
• 1981

세계에서 잠업기술이 가장 발달하고 있는 일본에서는 근래 고치의 생산이 해마다 줄어들고 있는데 그 가장 중요한 원인은 농촌노력이 부족한데 있다. 따라서 일본은 고치의 생산량을 유지하기 위하여 잠업의 모든 생산과정을 기계화함으로써 노동생산성을 높이는데 전력하고 있다. 이러한 견지에서 일본에서는 뽕의 조기 수확과 기계화하는데 적합한 밀식재배법의 연구, 뽕의 수확기계의 개발 뽕밭관리의 기계화 등 노력을 절감하기 위한 많은 연구가 이루어지고 있다. (중략)

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2020.06a
• /
• pp.91-91
• /
• 2020

• 한국신재생에너지학회:학술대회논문집
• /
• 2010.06a
• /
• pp.181.1-181.1
• /
• 2010

풍력터빈에서 전력생산량은 속도의 세제곱에 따라 바람의 속도에 크게 영향 받는다. 본 연구에서는 기상청에서 제공하는 새만금 인근 해안의 2005부터 2007년까지의 AWS(지역별 관측자료)와 해양에서 떨어진 새만금 서해의 2000년부터 2009년까지 QuikSCAT위성 데이터를 이용하여 속도에 따른 확률 밀도 분포를 획득하였다. 측정된 관측 데이터는 80m 높이에서의 보정 자료를 근거로 하였으며, IEC 61400-12와 13을 근거로 실증단지 적합성에 대한 분석을 하였다.

• Proceedings of the KAIS Fall Conference
• /
• 2011.12b
• /
• pp.624-627
• /
• 2011

본 논문에서는 산업단지에 공정증기를 공급하는 열병합 발전소 건설에 대한 타당성 분석시 적용되는 경제성 분석에 대한 것으로, 동일한 보일러 및 주증기 그리고 공정증기 조건하에서 배압터빈 및 복수터빈 적용시 수반되는 경제성 분석을 통해 타당성 있는 시스템을 선정하는데 그 목적이 있다. 복수터빈 방식이 배압터빈 방식에 비해 전력생산량은 약 3배정도 많으나 초기 시설투자비의 증대 및 상대적인 에너지 활용측면에서 낮은 결과를 나타냈다.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.2222-2223
• /
• 2008

JCS(Joint Control System)는 대규모 조력발전소에서의 조력발전소에 설치된 10대(25.4MWx10기)이상의 발전기에 대한 전자동 운전, 운영의 최적화, 운전 모드, 발전소 특성변수, 각종 운전상의 또는 법적 규제치 등을 고려하여 전력생산량을 극대화한다. 또한 발전소 운영의 단순화(종합설정: Global Setting, 부하특성곡선 등) 안전한 운전을 위한 발전소의 각종 변수 및 제한값을 감시하며 발전소의 발전기를 한 대의 발전기처럼 제어할 수 있도록 한다.

• Journal of the Korean Solar Energy Society
• /
• v.26 no.1
• /
• pp.73-79
• /
• 2006

The integration of PV modules into building facades or roof could raise PV module temperature that results in the reduction of electrical power generation. Lowering operating temperature of PV module is important in this respect, and PV module temperature should be considered more accurately, for building-integrated PV(BIPV) systems in predicting their performance. This paper describes a BIPV solar roof design and verifies its performance through experiment In relation to the effect of ventilation in space between PV module and roof surface. The results showed that the ventilation in the space had a positive effect in lowering the module temperature of the BIPV solar roof that enhanced the performance of its electricity generation.