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KSTAR 전력계통 안정화를 위한 무효전력보상 및 고조파 필터 시스템 설계
홍성록(Seong-Lok Hong),공종대(Jong-Dae Kong),황인성(In-Sung Hwang),엄대영(Dae-Young Eom),김양수(Yaung-Soo Kim),박병주(Byung-ju Park),유항규(Hang-Kyu Yoo) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
KSTAR(Korea Superconducting Tokamak Advanced Reseach)장치는 차세대핵융합연구장치로써 30개의 초전도자석으로 구성된다. 이 초전도자석에 전원을 공급하게 되는 PF (Poloidal Field) MPS (Magnet Power Supply)는 12상 Pulse 운전을 하게 되는데 이때 h=kp±1의 특성고조파와 90%에 가까운 무효전력이 발생되어 KSTAR 전력계통과 인근 부하장치에 치명적인 영향을 줄 수 있어 고조파와 무효전력을 동시에 보상할 수 있는 최적의 무효전력보상장치의 도입은 필연적이다. 본 논문에서는 KSTAR 1st Plasma 실험시의 무효전력과 고조파를 저감하기 위해 설치했던 즉, 1단계 기계식 스위칭에 의한 RPC(Reactive power compensator)의 보상특성의 평가결과를 기반으로 KSTAR 2009년 Plasma 실험에 대비하여 이의 운전특성과 설치 공간에 따르는 제약 등을 고려하여 최적의 RPC 설계를 도출하기 위해 실시한 TSC(Thyristor Switch Capacitor)기반의 RPC[1] 모의해석 결과와 기술적 사항을 소개하고자 한다.
Stabilization of the KSTAR Power System for the First Plasma Operation
Jong-Dae Kong,Seong-Lok Hong,In-Sung Hwang,Jae-Hoon Choi,Chang-Hwan Kim,Dong-Keun Lee,Yaung-Soo Kim,Myeun Kwon,Byung-Ju Park,Hang-Kyu Yoo IEEE 2010 IEEE transactions on plasma science Vol.38 No.9
<P>After more than ten years of construction, the Korea Superconducting Tokamak Advanced Research (KSTAR) device finally completed its assembly in June 2007. We conducted the first plasma operation from April 2008 to July 2008 and succeeded in the plasma generation in July 2008. The electric power system for the first plasma operation is made up of various electric devices, including 154-kV circuit-breaker systems, a 154/22.9-kV 50-MVA transformer, 22.9-kV circuit-breaker systems, and reactive power compensator (RPC) and harmonic filter (HF) systems. When the poloidal-field magnet power supplies were operated, the reactive power and harmonic currents (12n ± 1) were generated instantaneously in the KSTAR electric power system for the first plasma generation due to the characteristics of the KSTAR superconducting coils. The measured voltage drop and harmonics seriously affected the other experimental equipment as well. Therefore, it is important to compensate the reactive power and remove the harmonics with the RPC and HF system for the superconducting tokamak device. In this paper, we discuss the stability of the electric power system and the operational results of the RPC and HF systems during the KSTAR first plasma operation. Furthermore, the upgrade plan of the electric power system based on the KSTAR operation plan will be discussed.</P>
공종대(Jong-Dae Kong),홍성록(Seong-Lok Hong),황인성(In-Seong Hwang),김양수(Yaung-Soo Kim),엄대영(Dae-Young Eom) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
핵융합반응은 초고온의 플라즈마 상태에서 가벼운 원자핵들이 융합하여 무거운 원자핵으로 바뀌는 현상으로, 이 과정에서 감소된 질량이 막대한 에너지로 변환되는데 이를 핵융합에너지라고 한다. 핵융합에너지는 인류의 에너지 위기를 극복할 수 있는 최적의 대체에너지이며, 무한, 청정, 고효율에너지이다. 이에 국가핵융합연구소(NFRI)는 Green Energy 의 개발과 핵융합에너지 상용화 기술을 개발하기 위해 핵융합연구장치인 KSTAR(Korea Superconducting Tokamak Adavanced Research)를 제작하여 장치의 운전연구 및 기술 확보에 힘을 쏟고 있다. 또한 핵융합 관련 파생기술을 활용한 첨단 신사업 창출에 기여하고 있다. 본 논문에서는 KSTAR 1st Plasma 실험 시 KSTAR 장치에 전력을 공급하기 위한 전력설비 현황, 전력품질분석, 전력사용량 분석을 통해 향후 KSTAR 장치 운전을 위해 필요한 수전설비 증설, 무효전력보상장치 증설 등과 같은 전력계통의 효율화와 안정화를 위한 개선사항에 대해 기술하였다.
Operation of KSTAR PF Superconducting Magnet Power Supplies Under MG Power System
Hyun-Sik Ahn,Dong-Ken Lee,Jae-Hoon Choi,Jong-Kuk Jin,Seong-Lok Hong,Dae-Young Eom,Kap-Rai Park Institute of Electrical and Electronics Engineers 2016 IEEE transactions on applied superconductivity Vol.26 No.4
<P>Poloidal field (PF) power supplies provide 20-25 kA to PF superconducting magnets to generate, maintain, and control the Korea Superconducting Tokamak Advanced Research (KSTAR) plasma. A substantial amount of grid power for PF power supplies is required. Before 2014, available grid power for PF power supplies reached only 50 MVA, which is comparably small to support the rated operation of PF magnets. To achieve high-performance and long pulse operation of KSTAR plasma, the motor generator (MG) system, whose maximum power is 200 MVA, was designed and tested up to 150 MVA with PF magnets in 2014. Frequency fluctuation of line voltage, voltage distortion, and harmonic current increases are found during the operation. The power supply control can be seriously affected by these problems because every PF power supply uses a 12-pulse thyristor converter that is sensitive to the power quality. In this paper, key features of power supply control under grid and MG power system are described, and the test results are presented.</P>
Choi, Jae-Hoon,Lee, Dong-Keun,Kim, Chang-Hwan,Jin, Jong-Kook,Han, Sang-Hee,Kong, Jong-Dae,Hong, Seong-Lok,Kim, Yang-Su,Kwon, Myeun,Ahn, Hyun-Sik,Jang, Gye-Yong,Yun, Min-Seong,Seong, Dae-Kyung,Shin, Hy The Korean Institute of Electrical Engineers 2013 Journal of Electrical Engineering & Technology Vol.8 No.2
The Korea Superconducting Tokamak Advanced Research (KSTAR) device is an advanced superconducting tokamak to establish scientific and technological bases for attractive fusion reactor. This device requires 3.5 Tesla of toroidal field (TF) for plasma confinement, and requires a strong poloidal flux swing to generate an inductive voltage to produce and sustain the tokamak plasma. KSTAR was originally designed to have 16 serially connected TF magnets for which the nominal current rating is 35.2 kA. KSTAR also has 7 pairs of poloidal field (PF) coils that are driven to 1 MA/sec for generation of the tokamak plasma according to the operation scenarios. The KSTAR Magnet Power Supply (MPS) was dedicated to the superconducting (SC) coil commissioning and $2^{nd}$ plasma experiment as a part of the system commissioning. This paper will describe key features of KSTAR MPS for the $2^{nd}$ plasma experiment, and will also report the engineering and commissioning results of the magnet power supplies.
Jae-Hoon Choi,Dong-Keun Lee,Chang-Hwan Kim,Jong-kook Jin,Sang-Hee Han,Jong-Dae Kong,Seong-Lok Hong,Yang-Su Kim,Myeun Kwon,Hyun-Sik Ahn,Gye-Yong Jang,Min-Seong Yun,Dae-Kyung Seong,Hyun-Seok Shin 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.2
The Korea Superconducting Tokamak Advanced Research (KSTAR) device is an advanced superconducting tokamak to establish scientific and technological bases for attractive fusion reactor. This device requires 3.5 Tesla of toroidal field (TF) for plasma confinement, and requires a strong poloidal flux swing to generate an inductive voltage to produce and sustain the tokamak plasma. KSTAR was originally designed to have 16 serially connected TF magnets for which the nominal current rating is 35.2 kA. KSTAR also has 7 pairs of poloidal field (PF) coils that are driven to 1 MA/sec for generation of the tokamak plasma according to the operation scenarios. The KSTAR Magnet Power Supply (MPS) was dedicated to the superconducting (SC) coil commissioning and 2<SUP>nd</SUP> plasma experiment as a part of the system commissioning. This paper will describe key features of KSTAR MPS for the 2<SUP>nd</SUP> plasma experiment, and will also report the engineering and commissioning results of the magnet power supplies.
Superconducting Magnet Power Supply System for the KSTAR 2nd Plasma Experiment and Operation
JAE HOON CHOI,DONG KEUN LEE,CHANG HWAN KIM,Jong-kook Jin,Sang-Hee Han,JONG DAE KONG,SEONG LOK HONG,Yang-Su Kim,MYEUN KWON,Hyun-sik Ahn,Gye-yong Jang,Min-seong Yun,Dae-Kyung Seong,Hyun-seok Shin 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.2
The Korea Superconducting Tokamak Advanced Research (KSTAR) device is an advanced superconducting tokamak to establish scientific and technological bases for attractive fusion reactor. This device requires 3.5 Tesla of toroidal field (TF) for plasma confinement, and requires a strong poloidal flux swing to generate an inductive voltage to produce and sustain the tokamak plasma. KSTAR was originally designed to have 16 serially connected TF magnets for which the nominal current rating is 35.2 kA. KSTAR also has 7pairs of poloidal field (PF) coils that are driven to 1 MA/sec for generation of the tokamak plasma according to the operation scenarios. The KSTAR Magnet Power Supply (MPS) was dedicated to the superconducting (SC) coil commissioning and 2nd plasma experiment as a part of the system commissioning. This paper will describe key features of KSTAR MPS for the 2nd plasma experiment, and will also report the engineering and commissioning results of the magnet power supplies.