KEPCO Journal on electric power and energy最新文献

{"title":"Development Trend of High Efficiency & Low Emissions Thermal Power Plants","authors":"Seok-Hyeon Yu, Seung-Gyu Gang, Jin-Ik Seok, Jeong-Seok Yu, Yong-Jun Choe, Yeong-Geon Go, Hyeong-Jin Kim","doi":"10.18770/KEPCO.2016.02.02.193","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.02.193","url":null,"abstract":"","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"229 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116439472","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}

{"title":"Review of CO 2 Storage Projects and Driving Strategy of CO 2 Storage Program in Korea","authors":"Lee-Gyun Gwon","doi":"10.18770/KEPCO.2016.02.02.167","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.02.167","url":null,"abstract":"","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128095401","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}

{"title":"Introducing the Latest 3GPP Specifications and their Potential for Future AMI Applications","authors":"K. Koumadi, Byong-seok Park, Nogil Myoung","doi":"10.18770/KEPCO.2016.02.02.245","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.02.245","url":null,"abstract":"Despite the exponential throughput improvement in mobile communications systems, their ability to satisfy requirements of stateof-the-art and future applications of advanced metering infrastructure (AMI) is still under investigation. Challenges are mainly due to the inadequacy of third generation partnership project (3GPP) networks to support large amounts of devices simultaneously, while the number of AMI end-devices and the frequency of their data transmission increase with new AMI-based applications. In this introductory survey, innovative and future AMI applications and their communication requirements are first reviewed. Then, we identify challenges of 3GPP long term evolution (LTE) in enabling future AMI applications. More importantly, the latest improvements to LTE-A standard release 12 and 13 are reviewed and analyzed with regards to their potential to improve the quality of LTE-enabled AMI. It is found that 3GPP enhancements on machine type communications (MTC) standards will significantly enhance AMI communications. Beyond MTC specifications, non-MTC-specific enhancements such as carrier aggregation and multi-connectivity for user equipment will also contribute greatly to improving reliability and availability of AMI devices. The paper’s focus is towards improved backhaul support for innovative and future AMI applications, beyond traditional automatic meter reading.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"182 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133209844","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}

{"title":"Effect Analysis for Frequency Recovery of 524 MW Energy Storage System for Frequency Regulation by Simulator","authors":"Geon-Pyo Lim, Yohan Choi, Chan-Wook Park, Soo-yeol Kim, B. Chang, R. Labios","doi":"10.18770/KEPCO.2016.02.02.227","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.02.227","url":null,"abstract":"To test the effectiveness of using an energy storage system for frequency regulation, the Energy New Business Laboratory at KEPCO Research Institute installed a 4 MW energy storage system (ESS) demonstration facility at the Jocheon Substation on Jeju Island. And after the successful completion of demonstration operations, a total of 52 MW ESS for frequency regulation was installed in Seo-Anseong (28 MW, governor-free control) and in Shin-Yongin (24 MW, automatic generation control). The control system used in these two sites was based on the control system developed for the 4 MW ESS demonstration facility. KEPCO recently finished the construction of 184 MW ESS for frequency regulation in 8 locations, (e.g. Shin-Gimjae substation, Shin-Gaeryong substation, etc.) and they are currently being tested for automatic operation. KEPCO plans to construct additional ESS facilities (up to a total of about 500 MW for frequency regulation by 2017), thus, various operational tests would first have to be conducted. The high-speed characteristic of ESS can negatively impact the power system in case the 500 MW ESS is not properly operated. At this stage we need to verify how effectively the 500 MW ESS can regulate frequency. In this paper, the effect of using ESS for frequency regulation on the power system of Korea was studied. Simulations were conducted to determine the effect of using a 524 MW ESS for frequency regulation. Models of the power grid and the ESS were developed to verify the performance of the operation system and its control system. When a high capacity power plant is tripped, a 24 MW ESS supplies power automatically and 4 units of 125MW ESS supply power manually. This study only focuses on transient state analysis. It was verified that 500 MW ESS can regulate system frequency faster and more effectively than conventional power plants. Also, it was verified that time-delayed high speed operations of multiple ESS facilities do not negatively impact power system operations. It is recommended that further testing be conducted for a fleet of multiple ESSs with different capacities distributed over multiple substations (e.g. 16, 24, 28, and 48 MW ESS distributed across 20 substations) because each ESS measures frequency individually. The operation of one ESS facility will differ from the other ESSs within the fleet, and may negatively impact the performance of the others. The following are also recommended: (a) studies wherein all ESSs should be operated in automatic mode; (b) studies on the improvement of individual ESS control; and (c) studies on the reapportionment of all ESS energies within the fleet.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124777100","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}

{"title":"Design of Thermodynamic Cycle and Cryogenic Turbo Expander for 2 kW Class Brayton Refrigerator","authors":"Jin-Woo Lee, C. Lee, Hyeongseok Yang, Seokho Kim","doi":"10.18770/KEPCO.2016.02.02.299","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.02.299","url":null,"abstract":"The High Temperature Superconducting power cables (HTS power cables) become increasingly longer to commercialize the HTS power cable system. Accordingly, demands on refrigerators of large cooling capacity per a unit system have been increased. In Korea, it is currently imported from abroad with the high price due to insufficient domestic technologies. In order to commercialize the HTS power cables, it is necessary to develop the refrigerators with large cooling capacity. The Brayton refrigerators are composed of recu-perative heat exchangers, compressors and cryogenic turbo expanders. The most directly considering the efficiency of the Brayton refrigerator, it depends on performance of the cryogenic turbo expander. Rotating at high speed in cryogenic temperature, the cryogenic turbo expanders lower temperature by expanding high pressure of a helium or neon gas. In this paper, the reverse Brayton cycle is","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126668763","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}

{"title":"Performance Comparison of Spray-dried Mn-based Oxygen Carriers Prepared with γ-Al 2 O 3 , α-Al 2 O 3 , and MgAl 2 O 4 as Raw Support Materials","authors":"J. Baek, Ui-Sik Kim, H. Jo, T. Eom, Joong-Beom Lee, H. Ryu","doi":"10.18770/KEPCO.2016.02.02.285","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.02.285","url":null,"abstract":"In chemical-looping combustion, pure oxygen is transferred to fuel by solid particles called as oxygen carrier. Chemical-looping combustion process usually utilizes a circulating fluidized-bed process for fuel combustion and regeneration of the reduced oxygen carrier. The performance of an oxygen carrier varies with the active metal oxide and the raw support materials used. In this work, spray-dried Mn-based oxygen carriers were prepared with different raw support materials and their physical properties and oxygen transfer performance were investigated to determine that the raw support materials used are suitable for spray-dried manganese oxide oxygen carrier. Oxygen carriers composed of 70 wt% Mn 3 O 4 and 30 wt% support were produced using spray dryer. Two different types of Al 2 O 3 ,  -Al 2 O 3 and  -Al 2 O 3 , and MgAl 2 O 4 were applied as starting raw support materials. The oxygen carrier prepared from  -Al 2 O 3 showed high mechanical strength stronger than commercial fluidization catalytic cracking catalyst at calcination temperatures below 1100  C, while the ones prepared from  -Al 2 O 3 and MgAl 2 O 4 required higher calcination temperatures. Oxygen transfer capacity of the oxygen carrier prepared from  -Al 2 O 3 was less than 3 wt%. In comparison, oxygen carriers prepared from  -Al 2 O 3 and MgAl 2 O 4 showed higher oxygen transfer capacity, around 3.4 and 4.4 wt%, respectively. Among the prepared Mn-based oxygen carriers, the one made from MgAl 2 O 4 showed superior oxygen transfer performance in the chemical-looping combustion of CH 4 , H 2 , and CO. However, it required a high calcination temperature of 1400 °C to obtain strong mechnical strength. Therefore, further study to develop new support compositions is required to lower the calcination temperature without decline in the oxygen transfer performance.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132447999","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}

{"title":"Analysis of Voltage Control of Stand-Alone Microgrid for High Quality Power Supply","authors":"Jongmin Jo, Hakju Lee, C. Shin, H. Cha","doi":"10.18770/KEPCO.2016.02.02.253","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.02.253","url":null,"abstract":"This paper analyzes voltage control method in order to supply high-quality power for stand-alone microgrid. Stand-alone microgrid is composed of battery bank, stand-alone PCS and controllable loads. The main role of stand-alone PCS is to supply high-quality power to loads as main source by using stable voltage method regardless of load conditions. In particularly, output voltage of stand-alone PCS gets severely unbalanced voltage under unbalanced loads. Fundamental positive and negative sequences are transformed by two coordinates transformation which are rotated in each opposite direction, respectively. Each fundamental d-q voltage is regulated by each fundamental PI control. In addition, low-order harmonics are compensated through resonant controllers. Performance of stand-alone microgrid is tested for feasibility, and it is verified that output voltage of THD is improved to 1% from 2.2% under 50 kW balanced load, and is improved to 1.1% from 2.6% under 50 kW unbalanced load.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"266 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122227713","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}

{"title":"Introduction and Current Status of Ultra Supercritical Circulating Fluidized Bed Boiler","authors":"Si-Hun Lee, Jong-Min Lee","doi":"10.18770/KEPCO.2016.02.02.211","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.02.211","url":null,"abstract":"","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124670468","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}

{"title":"이산화탄소 포집기술 국외 기술개발 동향","authors":"백점인","doi":"10.18770/KEPCO.2016.02.02.143","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.02.143","url":null,"abstract":"COP21에서 채택된 파리협정에서 명시한 지구 대기온도 $2^{circ}C$ 이하 상승억제 목표를 달성하기 위해서는 현재 각 당사국이 제출한 감축 목표치로만은 부족한 상황이다. 이에 따라 향후 감축목표를 상향하기 위한 작업이 이루어질 것이다. $CO_2$ 배출량을 줄이기 위한 여러 수단 중 이산화탄소 포집 및 저장(CCS: ...","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116453245","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}

{"title":"Evaluation of Degradation Characteristics of Thermal Barrier Coating on Gas Turbine Blades","authors":"Yongchan Jung, Min-Tae Kim, Ju-Hak Lee, Jamin Ahn, Kihong Kim","doi":"10.18770/KEPCO.2016.02.02.273","DOIUrl":"https://doi.org/10.18770/KEPCO.2016.02.02.273","url":null,"abstract":"In order to evaluate the lifespan of high-temperature parts with thermal barrier coating in gas turbines used for power generation, this study was performed on an 80 MW-class gas turbine exceeding 24 k equivalent operating hours. Degradation characteristics were evaluated by analyzing the YSZ (Yttria Stabilized Zirconia) top coat, which serves as the thermal barrier coating layer, the NiCrAlY bond coat, and interface layers. Microstructural analysis of the top, middle, and bottom sections showed that Thermal Growth Oxide (TGO) growth, Cr precipitate growth within the bond coat layer, and formation of diffusion layer occur actively in high-temperature sections. These microstructural changes were consistent with damaged areas of the thermal barrier coating layer observed at the surface of the used blade. The distribution of Cr precipitates within the bond coat layer, in addition to the thickness of TGO, is regarded as a key indicator in the evaluation of degradation characteristics.","PeriodicalId":445819,"journal":{"name":"KEPCO Journal on electric power and energy","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114536399","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}