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전기방사에 의한 폴리에테르이미드(PEI)-MWCNT 복합섬유의 제조 및 물성에 대한 연구
김아롱,강영아,박종승,Kim, A-Rong,Kang, YoungAh,Park, Jong S. 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.5
We have prepared multi-walled carbon nanotube (MWCNT)-embedded conductive composite fibers using polyetherimide (PEI) as a polymer matrix (denoted as PEI-MWCNT). Uniform dispersion of the MWCNTs in dimethylacetamide was achieved after functionalization with quadruple hydrogen bonding sites, after which conductive composite fibers were produced via an electrospinning process. PEI-MWCNT fibers were prepared containing up to 3 wt% MWCNTs, and the resulting fibers were analyzed in order to determine the diameter and electrical conductivity of the fibers. Analysis of the fibers with scanning electron microscopy (SEM) revealed highly porous fiber structures, and that the MWCNTs were well-dispersed within the PEI matrix. Increasing the amount of MWCNTs in the fiber resulted in a decrease in the average fiber diameter, and the electrical conductivity was improved even when only a small amount of functionalized MWCNT was present.
내부고장을 고려한 AF-SMES 시스템의 시뮬레이션 해석 및 제작에 관한 연구
김아롱(A-Rong Kim),김재호(Jae-Ho Kim),김해종(Hae-Jong Kim),김석호(Seok-Ho Kim),성기철(Ki-Chul Seong),박민원(Minwon Park),유인근(In-Keun Yu) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Recently, utility network is getting more and more complicated and huge. In addition to, demands of power conversion devices which have non-linear switching devices are getting more and more increased. Consequently, according to the non-linear power semiconductor devices, current harmonics are unavoidable. Those current harmonics flow back to utility network and become one of the reasons which make the voltage distortion. On the other hands, voltage sag from sudden increasing loads is also one of the terrible problems inside of utility network. In order to compensate the current harmonics and voltage sag problem, AF(Active Filter) systems could be a good solution method and SMES(Superconducting Magnetic Energy Storage) system is a very good promising source due to the high response time of charge and discharge. Therefore, the combined system of AF and SMES is a wonderful device to compensate both harmonics current and voltage sag. However, unfortunately SMES needs a superconducting magnetic coil. Because of the introduction of superconducting magnetic coil, quench problem caused by unexpected reasons is always existed. In case of discharge operation, quench is a significantly harmful factor according as it decreases the energy capacity of SMES. Therefore, this paper presents a decision method of the specification of the AF-SMES system considering internal fault condition. Especially, authors analyzed the change of the original energy capacity of SMES regarding to the size of resistance caused by quench of superconducting magnetic coil. Finally, based on this simulation, authors manufactured actual Active Filter System using DSP.
전력품질 개선을 위한 2.5MJ급 SMES 적용 시뮬레이션
김아롱(A-Rong Kim),김진근(Jin-Geun Kim),김경훈(Gyeong-Hun Kim),박민원(Minwon Park),유인근(In-Keun Yu),박정도(Jung-Do Park),이동영(Dong-Young Yi),이상진(Sangjin Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
Wind power generation system (WPGS) causes frequency and voltage fluctuation due to wind speed variation. Superconducting magnetic energy storage (SMES) system can overcome the fluctuations through the fast response time of energy charging and discharging. The SMES system should be connected to the terminal of the WPGS for frequency stabilization. To demonstrate the effectiveness of SMES system for power quality improvement, Ulleung island power network was modeled in a real time digital simulator (RTDS). The RTDS-based simulation results of power quality improvement with SMES are investigated and discussed in detail.
소형 HTS SMES와 실시간 전력계통 시뮬레이터의 연계 알고리즘 제안
김아롱(A-Rong Kim),김경훈(Gyeong-Hun Kim),김광민(Kwang-Min Kim),박민원(Minwon Park),유인근(In-Keun Yu),심기덕(Kideok Sim),김석호(Seok-Ho Kim),성기철(Ki-Chul Seong),박영일(Youngil Park) 대한전기학회 2010 전기학회논문지 Vol.59 No.1
Superconducting Magnetic Energy Storage (SMES) system is one of the key technologies to overcome the voltage sag, swell, interruption and frequency fluctuation by fast response speed of current charge and discharge. In order to evaluate the characteristics of over mega joule class grid connected High Temperature Superconducting (HTS) SMES system, the authors proposed an algorithm by which the SMES coil could be connected to the Real Time Digital Simulator (RTDS). Using the proposed algorithm, users can perform the simulation of voltage sag and frequency stabilization with a real SMES coil in real time and easily change the capacity of SMES system as much as they need. To demonstrate the algorithm, real charge and discharge circuit and active load were manufactured and experimented. The results show that the current from real system was well amplified and applied to the current source of simulation circuit in real time.
Connection algorithm of Real Time Digital Simulator with HTS SMES for power quality improvement
A-Rong Kim(김아롱),Dae-Won Kim(김대원),Gyeong-Hun Kim(김경훈),Jin-Geun Kim(김진근),Minwon Park(박민원),In-Keun Yu(유인근),Kideok Sim(심기덕),SeockHo Kim(김석호),Ki-Chul Seong(성기철) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Superconducting Magnetic Energy Storage (SMES) system is one of the key technologies to overcome the voltage sag, swell, interruption and frequency fluctuation by fast response speed of current charge and discharge. In order to evaluate the characteristics of over mega joule class grid connected High Temperature Superconducting (HTS) SMES system, the authors proposed an algorithm by which the SMES coil could be connected to the Real Time Digital Simulator (RTDS). Using the proposed algorithm, users can perform the simulation of voltage sag and frequency stabilization with a real SMES coil in real time and easily change the capacity of SMES system as much as they need. To demonstrate the algorithm, real charge and discharge circuit and active load were manufactured and experimented. The results show that the current from real system was well amplified and applied to the current source of simulation circuit in real time.
김아롱(A-Rong Kim),김경훈(Gyeong-Hun Kim),김진근(Jin-Geun Kim),박민원(Minwon Park),유인근(In-Keun Yu),이상진(Sangjin Lee),박정도(Jung-Do Park),이동영(Dong-Young Yi) 대한전기학회 2010 전기학회논문지 Vol.59 No.12
Wind power generation system (WPGS) of Ulleung Island causes frequency and voltage fluctuation due to wind speed variation during night time. Superconducting magnetic energy storage (SMES) system can overcome the fluctuations through the fast response time of energy charging and discharging. The SMES system should be connected to the terminal of the WPGS for frequency stabilization. To demonstrated the effectiveness of SMES system for power quality improvement, Ulleung Island power network was modeled in a real time digital simulator (RTDS). The RTDS-based simulation results of power quality improvement with SMES are investigated and discussed in detail.