• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국제학술편); KOEX, Seoul; 19-21 Oct. 1992
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• pp.106-111
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• 1992

In order to achieve stable and efficient use of energy at iron and steel works, a model for the prediction of supply and demand of electric power system is developed on the basis of the information on operation and particular patterns of electric power consumption. The optimal amount of electric power to be purchased and the optimal fuel allocation for the in-house electric power plants are also obtained by a mixed-integer linear programming(MILP) and a nonlinear programming (NLP) solutions, respectively. The validity and the effectiveness of the proposed model are investigated by several illustrative examples. The simulation results show the satisfactory energy saving by the optimal solution obtained through this research.

• 한국수자원학회논문집
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• 제50권7호
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• pp.441-453
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• 2017

상수관망 시스템은 다수의 이용자에게 용수를 공급하기 위한 사회기반시설물로써, 적절한 수압을 유지하고 안정적으로 용수를 공급할 수 있어야 한다. 따라서 안정적인 설계와 효율적인 운영을 위해서는 상수관망 시스템의 용수 공급능력을 정량적으로 파악하는 것이 중요하다. 이러한 노력의 일환으로 상수관망 시스템 내 에너지 거동을 통해 신뢰도를 정량화한 신뢰도 지수가 다양한 방법으로 개발되어 왔다. 대부분의 신뢰도 지수는 공통적으로 절점에서의 최소요구수두 및 초과수두의 형태로 공급된 에너지를 기반으로 산정되며, 일부 지수의 경우 상수관망에 공급된 총 에너지 또는 용수 공급과정에서 손실된 에너지를 추가적으로 고려하여 산정된다. 본 연구에서는 상수관망의 용수 공급 과정에 따른 에너지 구성 요소를 소개하였으며 기존에 개발된 몇 가지 신뢰도 지수를 대상으로, 상수관망의 공급부하 상황을 고려한 시나리오 분석을 통해 신뢰도 지수의 적용성을 알아보고자 하였다. 또한, 각 절점 별 지수값을 도시함으로써, 상수관망 내 신뢰도의 공간적 분포를 나타내어 분석함으로써 보다 확장된 시스템 신뢰도 지수의 활용방안을 제시하였다.

• 한국유체기계학회 논문집
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• 제11권4호
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• pp.52-62
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• 2008

All forecasts of a future energy demand anticipate an increase across the globe. With the increase of energy demand, the emission of $CO_2$ is also likely to increase by at least the same amount because energy supply will be based on fossil fuels, which is more apparent in a number of developing countries. In this context, the Micro Gas Turbine (MGT) is being considered as a promising solution. In order to propose a feasible concept of those technologies such as improving environmental effect and economics, we performed a sensitivity study for a biomass fueled MGT using a simulation model. The study consists of 1) the fundamental modeling using manufacturer's technical specifications, 2) the correction with the experimental data, and 3) the sensitivity study for system parameters. The simulation model was developed by PEPSE-GT 72, commercial steam/gas turbine simulation toolbox.

• 한국수소및신에너지학회논문집
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• 제33권5호
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• pp.470-498
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• 2022

Recently, the world has been considering hydrogen energy as the primary energy transition means to achieve carbon neutrality by 2050. In order to achieve the goal of reducing greenhouse gas emissions, Korea is also promoting a clean hydrogen economy. However, it is necessary to introduce various clean hydrogen from overseas so that the projected demand can not meet the domestically produced. For this study, we conducted the policy comparison approach between countries other than the generally considered technical and economic approaches. The finding proposes the direction of bilateral cooperation for a strategy of securing overseas clean hydrogen from a geopolitical perspective. Germany was a target country for the policy comparison since it has a high proportion of manufacturing, like Korea, and is taking the lead in the renewable-based energy transition policy. According to the survey and analysis of the policy establishment status and new projects of the two countries, Germany is promoting bilateral international cooperation in the hydrogen area with about 33 countries based on 7 types of activities. In comparison, Korea is involved in bilateral cooperation with about 12 countries on relatively few activities. Among the types of bilateral cooperation, R&D cooperation with advanced countries for hydrogen technology was a common activity type. Germany preemptively promotes cooperation for demonstration and commercialization, considering geopolitical means and strengthening manpower training and assistance on policy and regulation to preoccupy the market for the future. Therefore, it is necessary to consider establishing a network of an entire life cycle of supply and demand network that links the future market with securing clean hydrogen considering the geopolitical distribution. To this end, Korea also needs to expand bilateral cooperation countries by activity type, and it seems necessary to seek various geopolitical-based bilateral cooperation and support measures for developing countries to diversify the supply sources of hydrogen.

• Korean Chemical Engineering Research
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• 제61권4호
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• pp.496-504
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• 2023

세계 각국은 지구온난화로 인한 피해가 증가함에 따라 화석연료를 대신해 탄소배출 없이 지속 가능하게 이용할 수 있는 새로운 에너지 자원들을 찾기 위하여 노력하고 있다. 전세계적으로 4차 산업이 고도화되며 전력수요가 급증했고, 상승하는 수요를 충족함과 동시에 온실가스 배출을 줄이기 위해 탄소비중이 적거나 없는 에너지원을 이용해 안정적인 전력수급계통을 확보하려는 움직임이 커지고 있다. 본 총설에서는 해외 탄소중립 시나리오와 화력발전 잔존여부에 따라 2가지 시나리오인 혁신, 안전으로 분류하여 정부의 탄소저감 목표를 비교 및 분석하였다. 또한, 국내 시나리오의 경우10차 전력수급기본계획의 전력수요 전망 및 온실가스 배출 현황을 연계하여 이를 토대로 탄소저감의 주축이 되는 에너지 분야인 전환, 수소, 수송, 탄소포집 및 활용 부문에서의 핵심 기술 동향 및 정부 주도의 정책흐름을 정리하여 탄소중립기술의 현황을 기술했다. 또한, 해외 시나리오 분석에서 시사되었던 에너지 분야의 주요 변화를 반영하여 국내 탄소저감 전략의 방향을 제시하였다.

• 에너지공학
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• 제24권2호
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• pp.59-71
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• 2015

본 논문에서는 산업연관분석을 이용하여 한국과 일본 전력산업의 국민경제적 파급효과를 분석하고자 한다. 먼저 수요유도형 모형을 이용하여 생산유발효과, 부가가치 유발효과를 살펴본다. 아울러 공급유도형 모형 및 레온티에프 가격모형을 적용하여 전력산업의 공급지장효과와 물가파급효과에 대하여 한국과 일본을 비교 분석한다. 이러한 분석은 전력산업을 외생화하여 이루어지게 된다. 분석결과 전력산업에서의 1원(엔) 생산이 타 산업에 유발하는 생산유발효과는 한국 0.5946원, 일본 0.5446엔 이었으며, 타 산업에 유발하는 부가가치 유발효과는 한국 0.1716원, 일본 0.2929엔이었다. 전력산업의 공급지장효과는 한국 1.5932원, 일본 1.2801엔이었으며, 전력산업의 10% 가격 인상으로 인한 물가파급효과는 한국 0.2113%, 일본 0.2196%로 한국이 높게 나타났다.

• 설비공학논문집
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• 제29권11호
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• pp.612-620
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• 2017

Power consumption in Southeast Asia is steadily increasing due to industrialization and the effects of hot and humid climates. However, there are not enough energy generation facilities and infrastructures to meet the growing demand because it is difficult to secure the construction and operation costs of the transmission and distribution systems. This study aims to develop a gas engine driven heat pump system that supplies heating, cooling and electric power to buildings. This system, besides its normal function to produce heat, has the capacity to generate electricity on a household level. This paper investigates similar cases overseas before developing the system. Through the investigation of commercialized similar systems, the level of technology and market trend of development system were identified. Features and specifications of commercial and industrial systems will be used for system development.

• Journal of Power Electronics
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• 제18권2호
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• pp.588-603
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• 2018

This paper presents the idea of a smart load that can adjust the input power flow based on the intermittent power available from RESs (Renewable Energy Resources) to regulate the line voltage, and draw a constant power from the grid. To this effect, an innovative power flow controller is presented based on a Resistive ES (Electric Spring) in combination with a PEAT (Power Electronics based Adjustable Transformer), which can effectively shape the load power flow at the subnetwork level. With a PEAT incorporated in the step down transformer at the grid side, the proposed controller can supply non-critical loads through local RESs, and the critical loads can draw a relatively constant power from the grid. If there is an abundance of power produced by the RESs, the controller can supply both non-critical loads and critical loads through the RES, which significantly reduces the power demand from the grid. The principle, practicality, stability analysis, and controller design are presented. In addition, simulation results show that the power flow controller performs well in shaping the load power flow at the subnetwork level, which decreases the power demand on the grid. Experimental results are also provided to show that the controller can be realized.

• 전기학회논문지
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• 제65권12호
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• pp.1949-1957
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• 2016

Rapid Expansion of EVs(Electric Vehicles) is inevitable trends, to comply with eco-friendly energy paradigm according to Paris Agreement and to solve the environment problems such as global warming. In this paper, we analyze the limit point of transformer acceptable capacity as the increase of power demand considering EVs supply in the near future. Through the analysis of transformer utilization, we suggest methods to analyze the spare capacity of transformer for the case of optimal efficiency operation and emergency operation respectively. We have the results of 18.4~29% spare capacity for the charging infrastructure to the rated capacity of transformer by analyzing the existing sample apartments. It is analyzed that the acceptable number of EVs is 0.09~0.14 for optimal efficiency operation and 0.06~0.13 for emergency operation. Therefore, it is analyzed the power demand of EV will exceed the existing transformer spare capacity in 7~8 years as the annual growth rate of EVs is prospected 112.5% considering current annual growth rate of EVs and the government EV supply policy.

• Advances in Energy Research
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• 제6권2호
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• pp.145-160
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• 2019

The world population reaches to about 7.7 billion in 2018 from 6.2 billion in 2000. This much growth in population results in increased energy demand and increased food supply. As the conventional energy sources are limited. These may deplete soon if consumed at this rate. So, the world is switching towards the utilization of non-conventional sources of energy. Energy from sun is the best method as it can not only solve the energy issue but also helps in meeting food demand by conserving it. Greenhouses are made for the purpose of food conservation. Various types of solar dryers are developed by researchers till now and still the effort is being putted to make them more efficient. Hybrid greenhouse is also effort toward utilization of solar energy in more efficient way. The paper presents the heat and mass transfer analysis of hybrid greenhouse solar dryer developed by different researchers till now. The review helps the researcher in understanding the heat and mass transfer taking place inside the hybrid greenhouse and how it can be further improved.