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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of the Korean Institute of Electrical Engineers P
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Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 64, Issue 4 - Dec 2015
Volume 64, Issue 3 - Sep 2015
Volume 64, Issue 2 - Jun 2015
Volume 64, Issue 1 - Mar 2015
Selecting the target year
Quantitative Analysis on the Electrical Fire Preventive Effect of Safety Inspection for Electrical Facilities for General Use
Kim, Taek-Hee ; Yoo, Jae-Geun ; Jeon, Jeong-Chay ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 64, issue 2, 2015, Pages 45~49
DOI : 10.5370/KIEEP.2015.64.2.045
This paper presents a quantitative analysis method to quantitatively indicate a electrical fire preventive effect of safety inspection for electrical facilities for general use. Logic model was developed based on whether enforcement of safety inspection for electrical facilities, and then the developed analysis model was converted to hydraulic model by using mathematical logic. The electrical fire preventive effect of safety inspection for electrical facilities was quantitatively calculated by applying electrical safety inspection results and fire statistics for five years to the developed hydraulic model. The results show that electrical fire preventive effects of 5,542 cases on annual average for five years.
A Development of Smart Monitoring Technique for Photovoltaic Power Systems
Cho, Hyun Cheol ; Sim, Kwang Yeal ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 64, issue 2, 2015, Pages 50~56
DOI : 10.5370/KIEEP.2015.64.2.050
This paper presents a smart monitoring technique for photovoltaic power systems by using wire and wireless communication networks in which the RS-232/484 and the Zigbee communication networks are inherently established respectively. In the proposed monitoring systems, environmental data sequences and the output power measured by sensors in photovoltaic systems are transferred to PC systems via two communication networks. We made electronic hardware boards for sensors and communication networks to construct its real-time monitoring system and carry out experiments for demonstrating reliability of the proposed monitoring system.
Development and Application of Operation Methods of Battery Energy Storage System for Frequency Regulation
Lim, Geon-Pyo ; Park, Doo-Yong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 64, issue 2, 2015, Pages 57~61
DOI : 10.5370/KIEEP.2015.64.2.057
Current research and development efforts and other projects for energy storage systems (ESS) have recently been gaining attention. This is due to the many applications where ESS, particularly batteries, can be used. Among these are peak shaving, frequency regulation, and stabilization of renewable energy output. KEPCO has completed the construction and demonstration of a 4-MW battery energy storage system (BESS) located in Jeju City to verify its practicability in the power grid. KEPCO Research Institute has also been developing technology for the commercialization of BESS, and has been conducting a trial run of a 52-MW ESS (28MW + 24MW of Seo-Anseong and Shin-Yongin substations) constructed in 2014 for frequency regulation. This paper discusses the development of operation methods, as well as an operation user interface, for the safe operation and monitoring of BESS used for frequency regulation in a power system. Included are operation and simulation methods for various normal and transient frequency situations that can be experienced by a power system. Also discussed are the results obtained after applying these methods to the 4-MW BESS and the 52-MW ESS, both used for frequency regulation. The technology in this paper will be applied to 500MW ESS for frequency regulation of KEPCO by 2017. It is expected that this technology helps a safe and reliable operation and control of ESS for frequency regulation through its continuous upgrade.
A Study on the Voltage Drop of Induction Generator along the Rotor Shape
Kim, Jong-Gyeum ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 64, issue 2, 2015, Pages 62~66
DOI : 10.5370/KIEEP.2015.64.2.062
Induction generator is easy to durability and maintenance than the synchronous generator. So, recently Induction generator has been widely applied to small-scale hydroelectric power plant. When the rotor is operating faster than synchronous speed, induction machine can generate electric power. Induction generator has a large inrush currents, such as the starting current of the induction motor. Induction motor has been designed a variety of rotor shape in order to reduce starting current. Since the occurrence of high inrush current cause a voltage drop to the system, it will need to reduce possible. Because the starting current of the squirrel-cage induction motor varies in accordance with the rotor shape, it is necessary to analyze the magnitude of inrush current in order to apply to the generator. In this study, we analyzed the inrush current and the voltage drop caused in accordance with the rotor shape of 1500kw induction generator.
A Study on Performance Enhancement of Distance Relaying by DC Offset Elimination Filter
Lee, Kyung-Min ; Park, Yu-Yeong ; Park, Chul-Won ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 64, issue 2, 2015, Pages 67~73
DOI : 10.5370/KIEEP.2015.64.2.067
Distance relay is widely used for the protection of long transmission line. Most of distance relay used to calculate line impedance by measuring voltage and current using DFT. So if there is a computation error due to the influence of phasor by DC offset component, due to excessive vibration by measuring line impedance, overreach or underreach can be occurs, and then abnormal and non-operation of distance relay can be issue. It is very important to implement the robust distance relaying that is not affected by DC offset component. This paper describes an enhanced distance relaying based on the DC offset elimination filter to minimize the effects of DC offset on a long transmission line. The proposed DC offset elimination filter has not need any prior information. The phase angle delay of the proposed DC offset filter did not occurred and the gain error was not found. The enhanced distance relay uses fault current as well as residual current. The behavior of the proposed distance relaying using off-line simulation has been verified using data about several fault conditions generated by the ATP simulation software.
Development of Peak Power Demand Forecasting Model for Special-Day using ELM
Ji, Pyeong-Shik ; Lim, Jae-Yoon ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 64, issue 2, 2015, Pages 74~78
DOI : 10.5370/KIEEP.2015.64.2.074
With the improvement of living standards and economic development, electricity consumption continues to grow. The electricity is a special energy which is hard to store, so its supply must be consistent with the demand. The objective of electricity demand forecasting is to make best use of electricity energy and provide balance between supply and demand. Hence, it is very important work to forecast electricity demand with higher precision. So, various forecasting methods have been developed. They can be divided into five broad categories such as time series models, regression based model, artificial intelligence techniques and fuzzy logic method without considering special-day effects. Electricity demand patterns on holidays can be often idiosyncratic and cause significant forecasting errors. Such effects are known as special-day effects and are recognized as an important issue in determining electricity demand data. In this research, we developed the power demand forecasting method using ELM(Extreme Learning Machine) for special day, particularly, lunar new year and Chuseok holiday.
Design and Feedback Performance Analysis of the Inverter-side LC Filters Used in the DVR System
Park, Jong-Chan ; Shon, Jin-Geun ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 64, issue 2, 2015, Pages 79~84
DOI : 10.5370/KIEEP.2015.64.2.079
Voltage sags are considered the dominant disturbances affecting power quality. Dynamic voltage restorers(DVRs) are mainly used to protect sensitive loads from the electrical network voltage disturbances such as sags or swells and could be used to reduce harmonic distortion of ac voltages. The typical DVR topology essentially contains a PWM inverter with LC Filter, an injection transformer connected between the ac voltage line and the sensitive load, and a DC energy storage device. For injecting series voltage, the PWM inverter is used and the passive filter consist of inductor(L) and capacitor(C) for harmonics elimination of the inverter. However there are voltage pulsation responses by the characteristic of the LC passive filter that eliminate the harmonics of the PWM output waveform of the inverter. Therefore, this paper presented design and feedback performance of LC filter used in the DVRs. The voltage control by LC filter should be connected in the line side since this feedback method allows a relatively faster dynamic response, enabling the elimination of voltage notches or spikes in the beginning and in the end of sags and strong load voltage THD reduction. Illustrative examples are also included.
Analyzing Smart Grid Energy Data using Hadoop Based Big Data System
Cho, YoungTak ; Lee, WonJin ; Lee, Ingyu ; On, Byung-Won ; Choi, Jung-In ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 64, issue 2, 2015, Pages 85~91
DOI : 10.5370/KIEEP.2015.64.2.085
With the increasing popularity of Smart Grid infrastructure, it is much easier to collect energy usage data using AMI (Advanced Measuring Instrument) from residential housing, buildings and factories. Several researches have been done to improve an energy efficiency by analyzing the collected energy usage data. However, it is not easy to store and analyze the energy data using a traditional relational database management system since the data size grows exponentially with an increasing popularity of Smart grid infrastructure. In this paper, we are proposing a Hadoop based Big data system to store and analyze energy usage data. Based on our limited experiments, Hadoop based energy data analysis is three times faster than that of a relational database management system based approach with the current system.
Capacity Gain of Polarization Aligned Dual-Polarized Antenna Systems
Wang, Hanho ; Noh, Gosan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 64, issue 2, 2015, Pages 92~95
DOI : 10.5370/KIEEP.2015.64.2.092
Capacity reflecting effects of quantized feedback information is evaluated through computer simulation for practical implementation of polarization angle estimation and compensation. In the dual-polarization antenna case, evaluated capacity values varies more than four times depending on accuracy of the polarization angle estimation and compensation. Using 6-bit the quantized feedback information, we can achieve 96.8 percentage of the capacity of the perfect feedback information case.