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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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KEPCO Journal on Electric Power and Energy
Journal Basic Information
Journal DOI :
Korea Electric Power Corporation
Editor in Chief :
Volume & Issues
Volume 2, Issue 2 - Jun 2016
Volume 2, Issue 1 - Mar 2016
Selecting the target year
Global Trend of CO
Capture Technology Development
Baek, Jeom-In ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 143~165
DOI : 10.18770/KEPCO.2016.02.02.143
The amount of greenhouse gas emission reduction based on INDCs (Intended Nationally Determined Contributions) submitted to UN by each party is not sufficient to achieve the Paris Agreement's aim to "hold the increase in the global average temperature to well below
above pre-industrial levels and to pursue efforts to limit the temperature increase to
" which was determined in the
Conference of the Parties to the UNFCCC (COP 21). Accordingly, the emission reduction target of each party will be revised for the
goal. Among the several options to reduce the carbon emission, CCS (Carbon Capture and Storage) is a key option to curb
emissions from large emission sources such as fossil-based power plants, cement plants, and steel production plants. A large scale CCS demonstration projects utilizing
capture technologies are under way around the world. It is anticipated, however, that the deployment of those
capture technologies in great numbers without government support will be difficult due to the high capture cost and considerable increase of cost of electricity. To reduce the carbon capture cost,
generation technologies are under development in a pilot or a bench scale. In this paper, current status of large scale CCS demonstration projects and the
generation capture technologies are summarized. Novel capture technologies on wet scrubbing, dry sorbent, and oxygen combustion are explained in detail for all capture areas: post-combustion capture, pre-combustion capture, and new combustion technologies.
Review of CO
Storage Projects and Driving Strategy of CO
Storage Program in Korea
Gwon, Lee-Gyun ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 167~185
DOI : 10.18770/KEPCO.2016.02.02.167
Synthesis of the Raw Materials of Polycarbonate and Polyurethane by CO
Baek, Jun-Hyeon ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 187~192
DOI : 10.18770/KEPCO.2016.02.02.187
Chemical utilization of
is recognized as the technology for the reduction of greenhouse gas as well as the use of carbon to resources. Although various chemicals are commercially produced, the innovative development is still necessary to utilize large quantity of
. In this report, the current status of technology to preserve -CO-O- linkage into the molecules was introduced, particularly for the synthesis of dimethyl carbonate (DMC) and polyols, which are raw materials of polycarbonate and polyurethane, respectively. RIST developed the novel process for the DMC production via urea methanolysis and the new catalytic system for polyol synthesis. Because of high contents of
in both chemicals, it is expected that they are able to contribute for the reduction of greenhouse gas.
Development Trend of High Efficiency & Low Emissions Thermal Power Plants
Yu, Seok-Hyeon ; Gang, Seung-Gyu ; Seok, Jin-Ik ; Yu, Jeong-Seok ; Choe, Yong-Jun ; Go, Yeong-Geon ; Kim, Hyeong-Jin ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 193~203
DOI : 10.18770/KEPCO.2016.02.02.193
화력발전설비의 격상 수명 연장
Hong, Gyeong-Tae ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 205~209
DOI : 10.18770/KEPCO.2016.02.02.205
Introduction and Current Status of Ultra Supercritical Circulating Fluidized Bed Boiler
Lee, Si-Hun ; Lee, Jong-Min ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 211~221
DOI : 10.18770/KEPCO.2016.02.02.211
The increase of world's population and economic development are the keys drivers behind growing demand for energy. Especially the demand for electricity would eventually result in an increase of coal usage. Therefore ultra supercritical circulating fluidized bed boiler has been developed as solutions of economic eco-friendly technologies for coal and of increasing supplies of low grade fuels. Ultra supercritical circulating fluidized bed boiler has an once through type of steam cycle different from drum type in subcritical circulating fluidized bed boiler. Also, the duplication of a proven commercial module with 100-300 MWe subcritical circulating fluidized bed might be the key for design of 500~800 MWe ultra supercritical circulating fluidized bed boiler. After 2017, ultra supercritical circulating fluidized bed boiler might become standard model over subcritical circulating fluidized bed boiler. Therefore, this paper will help you to understand ultra super critical circulating fluidized bed (USC-CFB) through describing the background, status and prospect of the CFB technology.
Experimental Study for Gate Trap and Generation Current using DCIV Method
Kim, Young Kwon ; Lee, Dong Bin ; Choi, Won Hyeok ; Park, Taesik ; Lee, Myoung Jin ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 223~225
DOI : 10.18770/KEPCO.2016.02.02.223
The newly proposed analysis method using a direct-current current-voltage (DCIV) simulation is introduced for investigating leakage current composing MOS transistor. From comparing the density and location of traps using DCIV method and investigating the leakage current of gate channel transistor, we proposed the graphical analysis method to correlate the DCIV current and leakage mechanism by the traps. And, our graphical method intuitively explains that leakage current in MOS transistor is well correlated with the DCIV current of the MOS transistor arrays due to two kinds of traps created by Fowler-Nordheim (F-N) stress and Hot carrier stress, respectively.
Effect Analysis for Frequency Recovery of 524 MW Energy Storage System for Frequency Regulation by Simulator
Lim, Geon-Pyo ; Choi, Yo-Han ; Park, Chan-Wook ; Kim, Soo-Yeol ; Chang, Byung-Hoon ; Labios, Remund ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 227~232
DOI : 10.18770/KEPCO.2016.02.02.227
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.
CIM and OPC-UA based Integrated Platform Development for ensuring Interoperability
Kim, Jun-Sung ; Park, Hee-Jeong ; Choi, Seung-Hwan ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 233~244
DOI : 10.18770/KEPCO.2016.02.02.233
Smart grid is called it as a system of systems. There are diverse types of systems in smart grid environment. Therefore, one of key factors to achieve smart grid successfully is interoperability among diverse systems. To secure interoperability, smart grid operating system should be developed complied with standards in terms of the data representation and communication. Common Information Model (CIM) and OLE Process for Control - Unified Architecture (OPC-UA) are the representative international standards in smart grid domain. Each standard defines data representation and communication by providing common information model and the unified architecture. In this paper, we explain a smart grid platform that we have developed to comply with CIM and OPC-UA standards for secure interoperability among numerous legacy systems.
Introducing the Latest 3GPP Specifications and their Potential for Future AMI Applications
Koumadi, Koudjo M. ; Park, Byong-seok ; Myoung, Nogil ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 245~251
DOI : 10.18770/KEPCO.2016.02.02.245
Despite the exponential throughput improvement in mobile communications systems, their ability to satisfy requirements of state-of-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.
Analysis of Voltage Control of Stand-Alone Microgrid for High Quality Power Supply
Jo, Jongmin ; Lee, Hakju ; Shin, Chang-hoon ; Cha, Hanju ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 253~257
DOI : 10.18770/KEPCO.2016.02.02.253
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.
Development of AMI NMS (Network Management System) using SNMP for Network Monitoring of Meter Reading Devices
Kim, Young-Il ; Park, So-Jeong ; Kim, Young-Jun ; Jung, Nam-Jun ; Choi, Moon-Suk ; Park, Byung-Seok ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 259~268
DOI : 10.18770/KEPCO.2016.02.02.259
KEPCO installed AMI (Advanced Metering Infrastructure) metering system for low-voltage customers from 2008. AMI metering system of KEPCO has operated 2.55 million customers and will plan to operate 22 million customers until 2020. KEPCO developed AMI NMS (Network Management System) to operate the meter reading network efficiently. NMS monitors the network status of DCUs (Data Concentration Unit) and modems. NMS provides functionalities of data collection and analysis. It collects property data of network device, network topology information, communication performance information, fault information, and etc. It analyzes collected data and controls network devices by remote access. AMI NMS collects about 370 MIBs (Mangement Information Bases) using SNMP (Simple Network Management Protocol). This paper introduces main functionalities, designed context, and implemented service screen.
Software Functional Requirements and Architectures of Microgrid Energy Management System
Sohn, Jin-Man ; Yun, Sang-Yun ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 269~272
DOI : 10.18770/KEPCO.2016.02.02.269
Distribution management system or microgrid energy management system plays an important role in monitoring, operation and control of electrical distribution systems by utilizing IT infrastructure. Nowadays, the rapid increase of the distributed resources makes the conventional management system have some additional functionality for the reliable operation due to intermittent renewables and the efficient operation on the economical purpose. In this paper, the brief standard software functional requirements of microgrid energy management system are provided through survey of the recent commercial products of the major vendors, and furthermore the architectures of microgrid energy management system are provided in comparison with major suppliers' microgrid energy management system. The summary of investigation will be able to make the developers and researchers focus on the specific functionality in the real world.
Evaluation of Degradation Characteristics of Thermal Barrier Coating on Gas Turbine Blades
Jung, Yongchan ; Kim, Mintae ; Lee, Juhyeung ; Ahn, Jamin ; Kim, Kihong ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 273~278
DOI : 10.18770/KEPCO.2016.02.02.273
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.
Experimental Evaluation of Cohesion Properties for Various Coals
Kim, Minsu ; Lee, Yongwoon ; Ryu, Changkook ; Park, Ho Young ; Lee, Hyun Soo ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 279~284
DOI : 10.18770/KEPCO.2016.02.02.279
Assessing the handling properties of coal becomes a major issue for the operation of a fuel supply system in power plants, due to the increased types of coal imported into Korea. In this study, the cohesion strengths of 13 bituminous and sub-bituminous coals from different countries were tested by measuring the amount of force that leads to a failure of consolidated particles. The particle size was in the range of 0.1-2.8 mm, which represents the coarse particles before pulverization. While the cohesion strength was proportional to the compression force in the tested range, the effects of the surface moisture content and the weight fraction of fines were crucial for cohesive coals. At fixed conditions of surface moisture and particle size, large variations were found in the cohesion propensity between coals. For coals of 0.1-0.5 mm with the moisture added close to the critical value, cohesive coals had the density over
after consolidation. The cohesion propensity was not correlated with the basic properties of coals with sufficient statistical significance.
Performance Comparison of Spray-dried Mn-based Oxygen Carriers Prepared with γ-Al
, and MgAl
as Raw Support Materials
Baek, Jeom-In ; Kim, Ui-Sik ; Jo, Hyungeun ; Eom, Tae Hyoung ; Lee, Joong Beom ; Ryu, Ho-Jung ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 285~291
DOI : 10.18770/KEPCO.2016.02.02.285
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, spraydried 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%
and 30 wt% support were produced using spray dryer. Two different types of
were applied as starting raw support materials. The oxygen carrier prepared from
showed high mechanical strength stronger than commercial fluidization catalytic cracking catalyst at calcination temperatures below
, while the ones prepared from
required higher calcination temperatures. Oxygen transfer capacity of the oxygen carrier prepared from
was less than 3 wt%. In comparison, oxygen carriers prepared from
showed higher oxygen transfer capacity, around 3.4 and 4.4 wt%, respectively. Among the prepared Mn-based oxygen carriers, the one made from
showed superior oxygen transfer performance in the chemical-looping combustion of
, and CO. However, it required a high calcination temperature of
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.
Development of the Corrosion Deterioration Inspection Tool for Transmission Tower Members
Woo, Sangkyun ; Chu, Inyeop ; Youn, Byongdon ; Kim, Kijung ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 293~298
DOI : 10.18770/KEPCO.2016.02.02.293
Recently, interests for maintenance of transmission tower are increasing to extend life of structures and reduce maintenance cost. However, existing classical diagnosis method of corrosion deteriorated degree on the transmission tower steel members, visual inspection, has a problem that error often due to difference of inspector's individual knowledge and experience. In order to solve the problem, this study carried out to develop the corrosion deterioration inspection tool for transmission tower steel members. This tool is composed of camera equipment and computer-aided diagnosis system. We standardized the photographing method by camera equipment to obtain suitable pictures for image processing. Diagnosis system was designed to evaluate automatically degree of corrosion deterioration for member of transmission tower on the basis of the RGB color image processing techniques. It is anticipated that developed the corrosion deterioration inspection tool will be very helpful in decision of optimal maintenance time for transmission tower corrosion.
Design of Thermodynamic Cycle and Cryogenic Turbo Expander for 2 kW Class Brayton Refrigerator
Lee, Jinwoo ; Lee, Changhyeong ; Yang, Hyeongseok ; Kim, Seokho ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 299~305
DOI : 10.18770/KEPCO.2016.02.02.299
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 recuperative 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 designed and the cryogenic turbo expander is designed in accordance with the thermodynamic cycle.
Investigation on Effective Operational Temperature of HTS Cable System considering Critical Current and AC loss
Kim, Tae-Min ; Yim, Seong-Woo ; Sohn, Song-Ho ; Lim, Ji-Hyun ; Han, Sang-Chul ; Ryu, Kyung-Woo ; Yang, Hyung-Suk ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 307~310
DOI : 10.18770/KEPCO.2016.02.02.307
The operational cost for maintaining the superconductivity of high-temperature superconducting (HTS) cables needs to be reduced for feasible operation. It depends on factors such as AC loss and heat transfer from the outside. Effective operation requires design optimization and suitable operational conditions. Generally, it is known that critical currents increase and AC losses decrease as the operational temperature of liquid nitrogen (
) is lowered. However, the cryo-cooler consumes more power to lower the temperature. To determine the effective operational temperature of the HTS cable while considering the critical current and AC loss, critical currents of the HTS cable conductor were measured under various temperature conditions using sub-cooled
by Stirling cryo-cooler. Next, AC losses were measured under the same conditions and their variations were analyzed. We used the results to select suitable operating conditions while considering the cryo-cooler's power consumption. We then recommended the effective operating temperature for the HTS cable system installed in an actual power grid in KEPCO's 154/22.9 kV transformer substation.
A Method to Find Feature Set for Detecting Various Denial Service Attacks in Power Grid
Lee, DongHwi ; Kim, Young-Dae ; Park, Woo-Bin ; Kim, Joon-Seok ; Kang, Seung-Ho ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 311~316
DOI : 10.18770/KEPCO.2016.02.02.311
Network intrusion detection system based on machine learning method such as artificial neural network is quite dependent on the selected features in terms of accuracy and efficiency. Nevertheless, choosing the optimal combination of features, which guarantees accuracy and efficienty, from generally used many features to detect network intrusion requires extensive computing resources. In this paper, we deal with a optimal feature selection problem to determine 6 denial service attacks and normal usage provided by NSL-KDD data. We propose a optimal feature selection algorithm. Proposed algorithm is based on the multi-start local search algorithm, one of representative meta-heuristic algorithm for solving optimization problem. In order to evaluate the performance of our proposed algorithm, comparison with a case of all 41 features used against NSL-KDD data is conducted. In addtion, comparisons between 3 well-known machine learning methods (multi-layer perceptron., Bayes classifier, and Support vector machine) are performed to find a machine learning method which shows the best performance combined with the proposed feature selection method.
Study on Emerging Technologies in Electric Power Industry
Park, Sooman ;
KEPCO Journal on Electric Power and Energy, volume 2, issue 2, 2016, Pages 317~325
DOI : 10.18770/KEPCO.2016.02.02.317
In recent years, the U.S, Japan, Europe and other developed countries are strategically developing technologies in order to prepare for paradigm shift affecting the electric power industry in a preemptive way. In particular, a chance for new business models and innovation in the electric power industry would rapidly increase with convergence of various technologies including Information and communication technologies. This study gathered up the theories and methodologies, and sorted out emerging technologies for the electric power industry with those theories. In order to find the emerging technologies, first, we identified the possible key issues of the electric power industry in the future using four mining techniques such as STEEP. Second, we drew agenda related with each key issue. Third, we organized candidates of the emerging technologies for solving the agenda and set the priority after evaluating the possibility of technical innovation and business. Finally, we selected the top fourteen of emerging technologies and assessed their feasibility. This study has a methodological significance because the emerging technologies were developed with a market-oriented approach rather than technical-push one that has been primarily used in another studies. The results of this study are able to be used in establishment of technology policy and R&D planning in the electric power industry.