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Review on Evaluation of Rare Earth Metals and Rare Valuable Metals Contained in Coal Ash of Coal-fired Power Plants in Korea 韩国燃煤电厂煤灰中稀土金属及稀有有价金属评价综述
KEPCO Journal on electric power and energy Pub Date : 2015-09-30 DOI: 10.18770/KEPCO.2015.01.01.121
Seok-Un Park, Jaekwon Kim, Yeon-Seok Seo, Jun-Seok Hong, Hyoung-Beom Lee, Hyun-dong Lee
{"title":"Review on Evaluation of Rare Earth Metals and Rare Valuable Metals Contained in Coal Ash of Coal-fired Power Plants in Korea","authors":"Seok-Un Park, Jaekwon Kim, Yeon-Seok Seo, Jun-Seok Hong, Hyoung-Beom Lee, Hyun-dong Lee","doi":"10.18770/KEPCO.2015.01.01.121","DOIUrl":"https://doi.org/10.18770/KEPCO.2015.01.01.121","url":null,"abstract":"Distribution of rare earth metals (REMs) and rare valuable metals (RVMs) contents in coal ashes (fly ash, bottom ash, and pond ash) and leachate from 11 coal-fired power plants in Korea were investigated. Coal ashes and leachates were found to contain important REMs and RVMs such as Yttrium (Y) and Neodymium (Nd), which was in the range of 23~75 mg/kg. However, it still requires developing effective recovery and separation methods in order to utilize REMs and RVMs in ash and leachate. Recovery of valuable elements (Y and Nd) from various and extensive ash sources (8.21 million tons/year in 2013) can provide the existing power plants with additional profit; therefore, it can significantly improve economics of the power plants.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114369278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An Improved Service Restoration Algorithm under Consideration of Abnormal Conditions in Distribution Automation Systems 一种考虑异常情况下配电自动化系统业务恢复的改进算法
KEPCO Journal on electric power and energy Pub Date : 2015-09-30 DOI: 10.18770/KEPCO.2015.01.01.047
N. Cho, Insung Kim, Sungwoo Lee
{"title":"An Improved Service Restoration Algorithm under Consideration of Abnormal Conditions in Distribution Automation Systems","authors":"N. Cho, Insung Kim, Sungwoo Lee","doi":"10.18770/KEPCO.2015.01.01.047","DOIUrl":"https://doi.org/10.18770/KEPCO.2015.01.01.047","url":null,"abstract":"The most important function in distribution automation system (DAS) is the service restoration. KEPCO’s current service restoration provides a very effective restoration service. However, it has been developed without the consideration of unexpected abnormal conditions that may occur while processing the sequence of switching operations. The objective of this paper is to provide practical service restoration schemes under consideration of abnormal conditions. The proposed service restoration schemes have been integrated to a branch office (B/O) in KEPCO. The proposed method strongly supports the conventional service restoration and adds to its value.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127278742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on Wind Power Prediction model based on Spatial Modeling 基于空间建模的风电功率预测模型研究
KEPCO Journal on electric power and energy Pub Date : 2015-09-30 DOI: 10.18770/KEPCO.2015.01.01.163
Solyoung Jung, J. Hur, Y. Choy
{"title":"Study on Wind Power Prediction model based on Spatial Modeling","authors":"Solyoung Jung, J. Hur, Y. Choy","doi":"10.18770/KEPCO.2015.01.01.163","DOIUrl":"https://doi.org/10.18770/KEPCO.2015.01.01.163","url":null,"abstract":"","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129156427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Co-combustion of Bituminous Coal with Anthracite in a Down-firing, 200 MW Boiler 烟煤与无烟煤在200mw降烧锅炉中的共燃
KEPCO Journal on electric power and energy Pub Date : 2015-09-30 DOI: 10.18770/KEPCO.2015.01.01.093
H. Park, S. Baek, Young Joo Kim, Tae Hyung Kim, Hyun Hee Kim, H. Lim, Y. Park
{"title":"Co-combustion of Bituminous Coal with Anthracite in a Down-firing, 200 MW Boiler","authors":"H. Park, S. Baek, Young Joo Kim, Tae Hyung Kim, Hyun Hee Kim, H. Lim, Y. Park","doi":"10.18770/KEPCO.2015.01.01.093","DOIUrl":"https://doi.org/10.18770/KEPCO.2015.01.01.093","url":null,"abstract":"The combustion tests for Korean anthracite-bituminous coal blend were carried out in the 200 MW utility boiler. The burning characteristics of the blend were studied with a thermogravimetric analyzer (TGA). From the observation of TGA burning profiles, it was found that the presence of bituminous coal in the blend appeared to enhance the reactivity of anthracite in the higher temperature region, indicating certain interactions between the two coals. The plant test showed the boiler operation was reasonably stable with somewhat poor combustion efficiency, and some modification of the combustion environment in the furnace is necessitate for the further stable plant operation.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130422549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on Calculation of Dynamic Penetration Limit of WTG and Applications of BESS in Power Systems WTG动态侵彻极限计算及BESS在电力系统中的应用研究
KEPCO Journal on electric power and energy Pub Date : 2015-09-30 DOI: 10.18770/KEPCO.2015.01.01.029
Han Na Gwon, W. Choi, K. Kook
{"title":"Study on Calculation of Dynamic Penetration Limit of WTG and Applications of BESS in Power Systems","authors":"Han Na Gwon, W. Choi, K. Kook","doi":"10.18770/KEPCO.2015.01.01.029","DOIUrl":"https://doi.org/10.18770/KEPCO.2015.01.01.029","url":null,"abstract":"풍력발전기와 같은 신재생에너지원은 기존 한 상황에서는 주파수 변동에 신속히 대응하지 못하므로 주파응답성능을 Since the characteristics of Renewable Energy Sources like wind turbine generators are very different from those of existing thermal power generators and their response to the sudden change of the frequency are not as good as that from thermal power generators. Especially when the penetration level of the wind power generation is substantially high, the output from the WTG would be possibly limited to keep the stability of power systems. For this, this paper implements the process for calculating the dynamic penetration limit of WTG and analyze the potential application of BESS for increasing the dynamic penetration limit of WTG.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124911171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of RF Inductive Couplers for Power Line Communication 电力线通信用射频电感耦合器分析
KEPCO Journal on electric power and energy Pub Date : 2015-09-30 DOI: 10.18770/KEPCO.2015.01.01.085
Young Seok Noh, Gunbok Lee, W. Park
{"title":"Analysis of RF Inductive Couplers for Power Line Communication","authors":"Young Seok Noh, Gunbok Lee, W. Park","doi":"10.18770/KEPCO.2015.01.01.085","DOIUrl":"https://doi.org/10.18770/KEPCO.2015.01.01.085","url":null,"abstract":"전력선 통신에서 사용되는 비접촉식 커플러의 신호 전달 특성을 향상시키기 위한 비접촉식 커플러의 구조와 자 기장 결합에 대한 연구를 수행하였다. 비접촉식 커플러의 결합 구조를 분석하였고, Rogowski 코일을 이용한 커플러와 자성체 코어를 이용한 커플러를 제작하여 구조에 따른 신호 전달 특성을 분석하였다. 집중 정수 소자와 임피던스 트 랜스포머를 이용한 임피던스 매칭법을 제안하여 협대역과 광대역에서 신호 전달 특성을 향상시켰고 전달 신호의 크 기는 대역폭과 트레이드오프가 있음을 보였다. 본 연구는 추후 부하 변동에 따른 임피던스 매칭 연구에 도움을 줄 수 있다. We investigated the structure of inductive coupler and its magnetic coupling to increase the transmission coefficient for power line communication. A Rogowski coil, which is an air-cored inductive coupler, and a magnetic cored coupler were fabricated to analyze the transmission coefficient for different coupler parameters. This paper proposes the impedance matching method using lumped elements and an impedance transformer to increase the transmission coefficient. In the experiment, the transmission coefficient of the proposed system was increased in both narrowband and broadband cases, and a trade-off between the transmission coefficient and the bandwidth was shown. This method will be useful for the further study of impedance matching with the load variation.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131586335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DC Electric Field Characteristics considering Thermal Effect for HVDC Slip-on Type Outdoor Termination 考虑热效应的直流滑套式室外端接直流电场特性
KEPCO Journal on electric power and energy Pub Date : 2015-09-30 DOI: 10.18770/KEPCO.2015.01.01.039
Ik-Soo Kwon, Jae-sang Hwang, Jae-Hong Koo, Kuniaki Sakamoto, Bang-wook Lee
{"title":"DC Electric Field Characteristics considering Thermal Effect for HVDC Slip-on Type Outdoor Termination","authors":"Ik-Soo Kwon, Jae-sang Hwang, Jae-Hong Koo, Kuniaki Sakamoto, Bang-wook Lee","doi":"10.18770/KEPCO.2015.01.01.039","DOIUrl":"https://doi.org/10.18770/KEPCO.2015.01.01.039","url":null,"abstract":"기중종단 접속함은 지중케이블과 가공송전선을 연결하기 위한 접속함으로써 옥외 변전소 등의 대기 중에 설치된다. 이는 21세기 핵심기술로 여겨지고 있는 대륙 간, 국가 간, 육지-섬을 잇는 HVDC 송전선로의 DC 그리드 송전망 형성을 위해 반드시 개발되어야 하는 전력기기이다. 그러나 AC용 접속함의 개발 사례는 다수 존...","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134103941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Screening of Spray-Dried K 2 CO 3 -Based Solid Sorbents using Various Support Materials for CO 2 Capture 不同载体材料喷雾干燥k2co3基固体吸附剂对co2捕集效果的筛选
KEPCO Journal on electric power and energy Pub Date : 2015-09-30 DOI: 10.18770/KEPCO.2015.01.01.115
T. Eom, Joong-Beom Lee, J. Baek, Chong Kul Ryub, Y. Rhee
{"title":"Screening of Spray-Dried K 2 CO 3 -Based Solid Sorbents using Various Support Materials for CO 2 Capture","authors":"T. Eom, Joong-Beom Lee, J. Baek, Chong Kul Ryub, Y. Rhee","doi":"10.18770/KEPCO.2015.01.01.115","DOIUrl":"https://doi.org/10.18770/KEPCO.2015.01.01.115","url":null,"abstract":"K2CO3-based dry regenerable sorbents were prepared by spray-drying techniques to improve mass produced K2CO3-Al2O3 sorbents (KEP-CO2P, hereafter), and then tested for their CO2 sorption capacity by a 2,000 Nm 3 /h (0.5 MWe) CO2 capture pilot plant built for Unit 3 of the Hadong thermal power station in 2010. Each of the sample sorbents contained 35 wt.% K2CO3 as the active materials with various support materials such as TiO2, MgO, Zeolite 13X, Al2O3, SiO2 and hydrotalcite (HTC). Their physical properties and reactivity were tested to evaluate their applicability to a fluidized-bed or fast transport-bed CO2 capture process. The CO2 sorption capacity and percentage utilization of K2CO3-MgO based sorbent, Sorb-KM2, was 8.6 g-CO2/100 g-sorbents and 90%, respectively, along with good mechanical strength for fluidized-bed application. Sorbs-KM2 and KT were almost completely regenerated at 140°C. No degradation of Sorb-KM by SO2 added as a pollutant in flue gas was observed during a cycle test.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"197 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132552146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Medium Voltage HTS Cable Thermal Simulation using PSCAD/EMTDC 基于PSCAD/EMTDC的中压高温电缆热仿真
KEPCO Journal on electric power and energy Pub Date : 2015-09-30 DOI: 10.18770/KEPCO.2015.01.01.145
C. Jung, Yeon-Woog Kang, Ji-Won Kang
{"title":"Medium Voltage HTS Cable Thermal Simulation using PSCAD/EMTDC","authors":"C. Jung, Yeon-Woog Kang, Ji-Won Kang","doi":"10.18770/KEPCO.2015.01.01.145","DOIUrl":"https://doi.org/10.18770/KEPCO.2015.01.01.145","url":null,"abstract":"This paper described the medium voltage high temperature superconducting cable thermal simulation and its application. New simulation method for HTS cable modeling using PSCAD/EMTDC is introduced in this paper. The developed simulation method consists of electrical model part and thermal model part. In electrical model part, power loss and thermal capacitance can be calculated in each layer, then the temperature of each layer can be calculated by power loss and thermal capacitance in thermal model part. This paper also analyzes the electrical and thermal characteristic in the case of normal operating condition and transient including single line to ground fault and line to line ground fault using new simulation method.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"298 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122109282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on CO 2 Decomposition using Ar/CO 2 Inductively Coupled Plasma Ar/ co2电感耦合等离子体分解co2的研究
KEPCO Journal on electric power and energy Pub Date : 2015-09-30 DOI: 10.18770/KEPCO.2015.01.01.135
Kyung-Hyun Kim, Kwan-Yong Kim, Hyo-Chang Lee, C. Chung
{"title":"Study on CO 2 Decomposition using Ar/CO 2 Inductively Coupled Plasma","authors":"Kyung-Hyun Kim, Kwan-Yong Kim, Hyo-Chang Lee, C. Chung","doi":"10.18770/KEPCO.2015.01.01.135","DOIUrl":"https://doi.org/10.18770/KEPCO.2015.01.01.135","url":null,"abstract":"유도 결합 플라즈마를 활용하여 Ar/CO 2 혼합가스에서 이산화탄소를 분해하는 연구이다 . 고밀도 플라즈마를 발생 시키기 위해 Ar 가스를 첨가하였고 이산화탄소 분해율을","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115474106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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