경제성 평가를 통한 태양광발전기와 연계된 배터리 에너지저장장치의 최적 용량 산정

김하양,김수덕,김현구 한국신·재생에너지학회 2019 신재생에너지 Vol.15 No.4

In situations, where the weight of a renewable energy certificate (REC) for a battery energy storage system (BESS) linked to a photovoltaic (PV) system is applied, it is necessary to evaluate the optimal capacity of the BESS to maximize the profit and prepare for a change in future support policy. The levelized cost of energy (LCOE) was calculated for a range of conditions using the hourly power generation data and charge/discharge guidelines of the nationwide PV plants. As a result, the optimal capacity of BESS under the current REC weight 5.0 was determined to be 2.7 times that of the PV capacity nationwide. In the reference cases of Jeju, Gyeongnam, and Jeonnam, which have the lowest, average, and highest solar radiation of the country, it was confirmed that the economic benefit by BESS linkage was higher in cases of lower solar radiation. If the REC weight is downgraded in the future, the optimal capacity of BESS will also be reduced. If there is no reduction in the BESS facility unit cost, the advantage of the REC weighted value of 3.5 or less will be lower than that of a PV single operation.

주요국의 신재생에너지 분야 기술경쟁력 분석 연구

하수진,최지혁,오상진 한국신·재생에너지학회 2022 신재생에너지 Vol.18 No.3

As the threat of climate change escalates, ‘net-zero’ has become a priority for the international community, and the use of new and renewable energy sources is expected to play a significant role in reaching international carbon neutrality. Here, we evaluate technological competitiveness in terms of implementation and technology by analyzing scientific literature and patents in the new and renewable energy fields of five major countries. For the past 10 years (2009-2019), the most active areas of new and renewable energy research and development have been solar power, wind power, waste, and fuel cells. China is the forerunner in implementation, whereas the United States has the most advanced technology. Portfolio analysis revealed that Korea’s fuel cell, the United States’ bioenergy, China’s waste, Japan’s solar and fuel cell, and the European Union’s wind power have shown to be in Star Field respectively. Technological competitiveness analysis found that Korea is lagging behind other countries in the new and renewable energy sector, and needs to set a new direction for future carbon-neutral research and development, investment, and policy.

재생에너지로서 산림바이오매스 활용 촉진을 위한 주요국의 정책분석을 통한 한국의 접근전략

이승록,박세훈,고문현,한규성 한국신·재생에너지학회 2022 신재생에너지 Vol.18 No.3

Forest biomass energy is based on scientific evidence in response to carbon neutrality and the climate crisis, international consensus, and environmental-geographic characteristics of each nation. In this study, the authors aimed to analyze macroscopic forest biomass energy policies for ten major countries. They categorized them into six detailed categories (Sustainable utilization, Cascading Uutilization, Replacement of fossil fuel/Carbon intensive products, Utilization of forest by-products/residues as the source of energy, Contribution to carbon-neutral/climate change, and Biomass combined with CCS/CCUS ). In addition, the surveyed nations have developed a policy consensus on the active use of forest biomass with sustainable forest management except for the cascading utilization category. Furthermore, the authors evaluated the mid to long-term plans of the Korean government for improvements in the policy and legal aspects. As a result, the authors derived four major directions that South Korea should approach strategically in the future (1) secure financial resources for sustainable forest management and stimulating investment in the timber industry, (2) promote unified policies to establish a bio-economy, (3) enhancement of the forest biomass energy system, and (4) reorganization and promotion of strategy centered on the opinions of field experts in internal and external instability.

가축분뇨의 신재생연료 활용을 위한 발효과정 유래 악취 저감 연구

박단비,김철웅,유대황,이경모,허증수,임정옥 한국신·재생에너지학회 2019 신재생에너지 Vol.15 No.4

livestock manure is processed into solid fuel, it can have huge benefits. This process not only provides a new energy source but helps initiate the recycling process. However, one large hurdle to the conversion of livestock manure into renewable energy is the generation of environmentally toxic and unpleasant odorous gas from fermentation of livestock manure. In this study, we developed an optimized odor reduction system to reduce odors down to environmentally acceptable level. The odor reduction system is operated via serial steps, including chemical treatment using alkali solutions, photooxidation treatment using UV and ozone, and plasma treatment before releasing the gas into air. At each reduction step, odor gas was collected and analyzed by Ewha Environment Co., Ltd, a certified gas analysis institute. The results demonstrate that the concentrations of ammonia, hydrogen sulfide, dimethyl sulfide, and methylmercaptan, which are the main causes of odor, were reduced to lower levels than acceptable values. Dimethyl disulfide, trimethylamine, n-butyric acid, n-valeric acid, and isovaleric acid were not detected.

신재생에너지 자원지도를 이용한 국내 폐광산지역 광해방지사업지의 태양광발전 잠재성 평가

최요순,송진영 한국신·재생에너지학회 2016 신재생에너지 Vol.12 No.S1

In many countries, there has been an increase in the number of renewable energy systems installed and operated inabandoned mine sites to promote the reuse of abandoned mine lands. Nowadays, 90% of mines are either closed or abandoned inKorea; most are left unattended. This study assessed the photovoltaic (PV) potential at abandoned mine reclamation sites in Koreausing renewable energy resource maps. Using geographic information systems, a spatial database was constructed for 218 abandonedmine reclamation sites that can be classified into five types: water treatment, forest recovery, soil restoration, tailings treatment, andsubsidence prevention. The top 10 sites with high annual total global horizontal irradiance (GHI) were selected by performing overlayanalysis to combine the solar energy resource and mine reclamation maps. The statistics of the annual total GHI at each type ofabandoned mine reclamation site and those at each administrative district were provided. In addition, the system advisor model byNREL was used to conduct energy simulations based on the weather data and 100 kW PV system design at the Samsan Jeil mine watertreatment site with the highest annual total GHI. The results indicated that the proposed PV system could generate 111,490 kWh/year.

한국의 산림바이오매스에너지 중장기 수요-공급전망과 화석연료 대체효과 분석

이승록,한희,장윤성,정한섭,이수민,한규성 한국신·재생에너지학회 2022 신재생에너지 Vol.18 No.3

This study analyzed the anticipated supply-and-demand of forest biomass energy (through wood pellets) until 2050, in South Korea. Comparing the utilization rates of forest resources of five countries (United Kingdom, Germany, Finland, Japan, and S. Korea), it was found that S. Korea does not nearly utilize its forest resources for energy purposes. The total demand for wood pellets in S. Korea (based on a power generation efficiency of 38%) was predicted to be 3,629 and 4,371 thousand tons in 2034 and 2050, respectively. The anticipated total wood pellet power generation ratio to target power consumption is 1.13% (5,745 GWh), 1.17% (6,336 GWh), and 1.25% (7,631 GWh) in 2020, 2030, and 2050, respectively. Low value-added forest residues left unattended in forests are called “Unused Forest Biomass” in S. Korea. From the analysis, the total annual potential amount of raw material, sustainably collectible amount, and available amount of wood pellet in 2050 were estimated to be 6,877, 4,814, and 3,370 thousand tons, respectively. The rate of contribution to Nationally Determined Contributions was up to 0.64%. Through this study, the authors found that forest biomass energy will contribute to a carbon neutral society in the near future at the national level.

마이크로그리드에서 신재생에너지의 최적 용량 및 위치 선정

나문수,김진오 한국신·재생에너지학회 2019 신재생에너지 Vol.15 No.1

Currently, with the increasing interest in renewable energy sources (RES), their penetration in the power system is expected to increase considerably. South Korea plans to increase the proportion of renewable energy to 20% by 2029 based on the 7th basic plan for long-term electricity supply and demand. On the other hand, expanding the penetration of renewable energy sources is a new challenge for conventional power systems. Most renewable energy sources, such as photovoltaic and wind power, are intermittent, and thus difficult to control without a loss of power. In addition, the intermittent characteristics leads to an imbalance ofpower and load. This can be solved by combining renewable energies because the output characteristics of wind power and solar are different. A reliability assessment is an appropriate method for achieving the optimal combination of renewable energy sources. Therefore, this paper proposes the optimal sizing and location of renewable energy sources in a microgrid based on a reliability assessment. In addition, a stochastic method for LOLE (Loss of Load Expectation) is also proposed to evaluate the reliability. In this case study, optimal sizing and locations are determined by the minimum LOLE and power loss in an IEEE 34-bus system.

국내 신재생에너지 자원지도의 R&D 수요 조사 분석

박년배,강용혁,윤창열,김진양,김현구 한국신·재생에너지학회 2016 신재생에너지 Vol.12 No.S1

Renewable energy resource maps that provide solar, wind, hydro, biomass, geothermal energy potential etc. have beenused for the renewable energy basic plan and pre-feasibility analysis of renewable energy deployment. To determine the R&D demandfor renewable energy resource maps in the Korea Institute of Energy Research, a structured questionnaire survey (about thousandperson) and experts in-depth interviews (about hundred person) targeting the users and potential customers of resource maps wereconducted from October to November 2015. The survey respondents who experienced resource maps mainly used map types, such assolar energy, hydropower, wind power etc. and mainly for business and academic purposes. 63% of respondents stated that resourcemaps update cycle should be per annum. Top priority needs to improve map utilization were updates for the latest resources data,higher map resolution, manual for using resource maps etc. 33% of the total respondents were using other institutions’ data. 26% ofthem purchased the data and spent about 8 million won annually on average for the data used. 48% of the total respondents said thatmobile app of resource maps needs to be developed. The demand survey of resource maps contributes to future R&D strategy ofrenewable energy resource maps.

제로에너지단지의 적정 수소 활용 규모 및 운용방식에 관한 연구

김준오,김철희,추소연 한국신·재생에너지학회 2023 신재생에너지 Vol.19 No.3

This study aims to evaluate the optimal size of the hydrogen facility to be installed in a zero-energy district in terms ofload matching and facility efficiency. A mismatch between energy generation and consumption is a common occurrence in zero-energydistricts. This mismatch adversely effects the energy grid. However, using an energy carrier such as hydrogen can solve this problem. To determine the optimal size of hydrogen fuel cells to be used on-site, simulation of hydrogen installation is required at both district-and building- levels. Each case had four operating schedules. Therefore, we evaluated eight scenarios in terms of load matching, heatloss, and facility operational efficiency. The results indicate that district-level installation of hydrogen facilities enables more efficientenergy use. Additionally, based on the proposed model, we can calculate the optimal size of the hydrogen facility.

유럽 주요국과 한국의 해상풍력개발 정부 정책 비교연구

박재희,김범석 한국신·재생에너지학회 2019 신재생에너지 Vol.15 No.3

South Korea announced Renewable Energy 3020 with a goal to supply a 20% share of renewable energy to the national energy mix by 2030. This paper suggests the implications of the government policy of offshore wind power development in Korea. The scope of the study compares the development policies with European countries, UK, Germany, Netherlands and Korea. The leading European countries are implementing a government lead-centralized development policy, in which the government takes the majority of the up-front development risk and undertakes the site selection, permission, and grid connection. Korea is implementing a developer led decentralized development policy, in which the developer takes full responsibility throughout all development phases and can make significant risks and delays.