• Research Article

    Operation Planing and Capacity Calculation of Energy Storage Systems Considering Curtailment of Renewable Energy

    재생에너지 출력제약을 고려한 에너지저장장치 운영방안 및 용량 산정

    Youngmin Kim, Beomseok Son, Se Ho Kim

    김영민, 손범석, 김세호

    This paper introduces operation planning and capacity calculation through combining of short-duration and long-duration energy storage systems (ESSs) for reducing curtailment. Because … + READ MORE
    This paper introduces operation planning and capacity calculation through combining of short-duration and long-duration energy storage systems (ESSs) for reducing curtailment. Because curtailment is related to time, a photovoltaic (PV) output occurs, short-duration ESS has a limitation for reducing curtailment; and capacity of long-duration ESS can be overestimated. We show a combination of short-duration battery energy storage system (BESS) and long-duration pumped storage hydro (PSH) to reduce curtailment as minimizing capacity. A combination of BESS and PSH is applied to small-scale grids with a high penetration of variable renewable energy. To find the effect of an input order of two types of ESSs, several case studies are conducted, and results are compared when the short-duration and long-duration of ESS are combined. If PSH is put in first, curtailment can be further reduced with less capacity. - COLLAPSE
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    30 April 2023

  • Research Article

    Research on Suitable Array Power Installation Density of Wind Turbines for the Assessment of Wind Energy Potential for Data Platform

    데이터 플랫폼내 풍력잠재량에 적용되는 풍력설비의 적정 용량 밀도에 대한 분석

    Keon-hoon Kim, Jin-young Kim, Su-jin Hwang, Chang-yul Yoon, Hyun-goo Kim

    김건훈, 김진영, 황수진, 윤창열, 김현구

    In response to the national policy for the reduction of CO2 gas emissions and the dissemination of renewable energy resource facilities, … + READ MORE
    In response to the national policy for the reduction of CO2 gas emissions and the dissemination of renewable energy resource facilities, the disseminated capacity of wind turbines is steadily expanding in Korea. However, to facilitate more realistic national dissemination planning, a more scientific basis for domestic wind potential and actual installation capability must be established. In this regard, a number of previous studies have provided details on the key parameters associated with wind energy potential. Among the major key points regarding wind energy potential is the array power density (APD) of wind turbines. However, this may be determined under certain ambiguous conditions associated with technical uncertainties. In general, an APD value of 5 MW/km2 is applied in Korea and a number of previous studies have reported results based on the application of APDs of 3 to 5 MW/km2. Given the diverse range of factors that can potentially influence the accuracy of the APD determinations for wind turbines, it is necessary to establish a more detailed and scientific basis for the determination of APD. In this study we seek to provide such a basis. To the best of our knowledge, this is the first study to assess the scientific basis of APD based on an examination of representative wind turbines, with respect to several technical specifications relating to wind speed, wind direction and IEC class conditions. We aim to scientifically analyze the effects of the performance characteristics of wind turbines on the APD, which is also the most important factor for an assessment of wind energy potential, and will contribute to establish an accurate technical basis for determination of APDs. On the basis of the findings in this study, we quantitatively identified the effective parameters for the determination of APD, which can be applied to facilitate an accurate determination of wind energy potential. Furthermore, these parameters have potential application as key variables in renewable energy data platforms and provide a technical reference for wind energy potential work area. - COLLAPSE
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    30 April 2023

  • Research Article

    Eco-friendly Approach of Silicon Recovery from Waste Silicon Photovoltaic Modules and Recycling of Silicon Powder

    폐 실리콘 태양광 모듈로부터의 실리콘 회수의 친환경적 접근 및 실리콘 분말 재활용

    Ga Min Kim, Hyo-jin Ahn, Hyo Sik Chang

    김가민, 안효진, 장효식

    This paper presents an eco-friendly approach for reducing chemical solutions in the chemical process of recovering silicon from a silicon solar cell … + READ MORE
    This paper presents an eco-friendly approach for reducing chemical solutions in the chemical process of recovering silicon from a silicon solar cell separated from a waste solar panel. Methanesulfonic acid or laser ablation was used to remove Ag metal electrodes instead of nitric acid. These processes can reduce the use of chemical acid solutions by 50% in our reference process consisting of nitric acid and hydrochloric acid. The purity of the recovered silicon powder measured by inductively coupled plasma atomic emission spectroscopy was more than 99.99% (4N). The feasibility of anode material for secondary batteries was tested by manufacturing recycled silicon powder and SiC powder using the recovered silicon. When the recovered silicon powder and high-purity silicon powder were mixed with the SiC powder, the initial capacity was 1256 mAh/g. - COLLAPSE
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    30 April 2023

  • Research Article

    Comparison of Thermal Insulation Performance Analysis Methods for Walls in Existing Buildings (Calculation Method of U-value and Average Heat Flow Meter Method)

    노후 건축물의 벽체 단열성능 분석 방법 비교 (열관류율 계산법과 평균 열류계법)

    Suin Lee, Hyun-Jung Choi

    이수인, 최현중

    The Korean government is implementing a 2050 carbon neutrality initiative to handle the climate crisis; furthermore, is striving to reduce building energy … + READ MORE
    The Korean government is implementing a 2050 carbon neutrality initiative to handle the climate crisis; furthermore, is striving to reduce building energy consumption through zero-energy building construction for new buildings and green remodeling projects for existing buildings. The latter is primarily based on the diagnosis of the thermal performance of the existing building envelope, and this diagnosis can lead to the development of rational energy-saving improvement measures. However, in practice the thermal insulation performance value of the envelope is derived based on the calculation values ​​on the blueprint or the legally required thermal transmittance at the time of completion, which is used for building energy analysis. In this study, the thermal transmittance of the wall was measured based on on-site diagnosis using the ISO 6946:2017 “Building components and building elements - Thermal resistance and thermal transmittance - Calculation methods”. The results were compared with those obtained from the calculation method to be utilized as a basis for analyzing the rational effects of green remodeling. - COLLAPSE
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    30 April 2023

  • Research Article

    Analysis of Factors Influencing the Diffusion of Building-Integrated Photovoltaic Systems

    건물형 태양광 시스템 보급 영향 요인 분석

    Sookyung Jeong, Juhee Jang, JongRoul Woo, Hae-seok Lee

    정수경, 장주희, 우종률, 이해석

    This study aims to identify the factors influencing the promotion of Building-Integrated Photovoltaics (BIPV) using the FGI and 1st Delphi methods … + READ MORE
    This study aims to identify the factors influencing the promotion of Building-Integrated Photovoltaics (BIPV) using the FGI and 1st Delphi methods to omit, add, and group the factors affecting the promotion of BIPV, and applying a 2nd Delphi method to confirm the relationships between the identified factors. A survey of companies engaged in the BIPV industry was conducted to collect data, and statistical analysis, such as exploratory factor analysis and correlation analysis, of the data collected with the Delphi method was performed. The independent variables were classified as BIPV policy environment, market environment, and manufacturing environment, and the dependent variable of BIPV system installation was predicted. The correlations between these variables were then analyzed, making it possible to promote the domestic BIPV industry and devise an efficient strategy for the activation of the BIPV industry before the diffusion of BIPV. - COLLAPSE
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    30 April 2023

  • Research Article

    A Study for Effect on the Power Consumption Reduction of ESS Constant Temperature System with Phase Change Material

    잠열재를 이용한 태양광 ESS 항온시스템의 소비전력 절감효과에 관한 연구

    Hyung Yong Ji, Sel Gi Ryu, Seungil Park, Jong Hyeon Peck

    지형용, 류슬기, 박승일, 백종현

    Li-ion batteries are mainly used in energy storage system (ESS) systems, but they have the issue of significant battery fire incidents. Many … + READ MORE
    Li-ion batteries are mainly used in energy storage system (ESS) systems, but they have the issue of significant battery fire incidents. Many thermal management technologies to respond to the heat load of batteries using phase change material (PCM) have been studied. We studied the thermal and power consumption properties depending on the charge/discharge and outside temperature of the ESS battery room through field survey data and an experiment. First, data for the heat pump power consumption and various temperature points of an ESS system were measured daily in the commercial operation of a 250 kWh PV-ESS for a year. Correlation analysis of the power consumption of a heat pump cooling and heating operation to maintain the temperature in the ESS battery room shows that the outside air temperature is the major factor. Furthermore, we conducted an experiment to determine the properties of temperature and power consumption by season at a fabricated ESS battery room with a 250 kWh Li-ion battery including 23°C PCM modules. PCM supports cooling and heating to maintain the room temperature as the heat pump operation cycles on and off. The ESS with applied PCM shows a reduction of heat pump power consumption and improved thermal management according to the load of the heating battery for charging/discharging and the day/night outside air temperature. The power consumptions for heating and cooling due to the battery heat load with a charging and discharging capacity of 150 kWh for each season condition for the only-heat-pump and PCM-applied system operations are 5.6 kWh and 0.88 kWh for changing seasons, 16.5 kWh and 15.8 kWh for summer, and 14.3 kWh and 12.2 kWh for winter, and the ratios of the power reductions are 84%, 3%, and 14%, respectively. - COLLAPSE
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    30 April 2023

  • Research Article

    KMA Open-API Weather Information based Performance Evaluation and Fault Detection Remote Monitoring System for Small and Medium-Scale PV Systems

    기상청 개방형-API 기상정보 기반 중·소규모 태양광발전 성능평가 및 고장감지 원격 모니터링시스템

    Hee Won Lim, Il Kwon Kim, U Cheul Shin

    임희원, 김일권, 신우철

    Small and medium-sized unmanaged grid-connected photovoltaic (PV) systems are difficult to manage owing to the installation costs of monitoring systems. Consequently, they … + READ MORE
    Small and medium-sized unmanaged grid-connected photovoltaic (PV) systems are difficult to manage owing to the installation costs of monitoring systems. Consequently, they can be left unattended for a long time following break downs. Thus, in this study, we developed a low-cost remote monitoring system for small-sized PV systems. The proposed monitoring system is equipped with a failure detection algorithm based on the simulation of an active system that accurately predicts the power output under normal operating conditions. Additionally, the monitoring system can recognize and notify a failure when the actual power generation is abnormally low. To lower the cost, we utilized SBC as a data server by edge computing and designed a monitoring system using the open-source software openHAB. Moreover, we used an open-API (ground weather observation data) provided by the Korea meteorological administration (KMA) to obtain hourly weather data (horizontal radiation, outdoor temperature, wind speed, etc.) for free to use in the simulation analysis. The Shewhart control chart was used as a benchmark for fault detection, where the ratio of the measured power generation to simulated generation was set as the observed value. From the verification test for actual grid-connected PV systems, it was confirmed that the monitoring system can effectively identify the occurrence of abnormal operating conditions, such as open-circuit, partial shading, etc. - COLLAPSE
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    30 April 2023
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