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Recent Progress for HTS Power Technology R&D in Korea

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Presentation on theme: "Recent Progress for HTS Power Technology R&D in Korea"— Presentation transcript:

1 Recent Progress for HTS Power Technology R&D in Korea
IEA HTS Programme ExCo meeting 20-21 May 2010, Stockholm, Sweden Recent Progress for HTS Power Technology R&D in Korea - HTS wire, Cable, and FCL - Ok-Bae Hyun/KEPCO

2 Commercialization of CC
R&D status of HTS CC Commercialization of CC ~ km-L, 4mm-w High Throughput Process High performance CC 20 m – Ic : 1 kA/cm targeted EDDC Production tech. 1 km – Ic : 500 A/cm targeted R2R RCE SUNAM

3 Fabrication processes for each layer
Typical Thickness R&D (KERI/SuNAM) Pilot line (SuNAM) Process Speed Cu ~ 20 μm Electro-plating 240 m/h 300 ~ 600 m/h Ag 2~ 3 μm Sputt. 10 m/h 360 m/h SmBCO (GdBCO) ~ 2 μm EDDC 100 m/h R2R RCE LMO PLD 50 m/h Epi-MgO ~ 50 nm Evap. 70 m/h Textured-MgO ~ 10 nm IBAD Y2O3 ~ 7 nm 500 m/h Al2O3 200 m/h Hastelloy ~ 70 μm Electro-polishing 90 m/h 720 m/h EDDC : Evaporation using Drum in Dual Chamber (Batch type RCE) Evap. : Evaporation with e-beam. Production speed is 4 mm wide equivalent

4 Fabrication of 100 m long- SmBCO CC by IBAD-EDDC (KERI)
Cu Ba Sm 35 45 40 65 50 55 60 10 30 20 15 25 Compositional ratio. 100m Differential pumping Buffered Substrate O2 Halogen heater ~15 mTorr SmBCO ~10-5 Torr Cryo Pump TMP Sm (SG) Ba (LG) Cu (LG) This is typical results obtained from our EDDC system. This is the tape which was wound on the drum after the deposition of SmBCO. We confirmed high Ic was obtained in the composition of Ba poor and Cu-rich compared to stoichiometric composition. We investigated microstructure at end parts of left and right. As shown here, the surface is very clean and dense. C-axis growth is also confirmed in XRD analysis. The in-plane texture, Delta phi of the obtained SmBCO layer is 4 degree. 100 m

5 Ic properties of EDDC – SmBCCO CCs
2008 2009 Short tape 513 A/cm-w @ 0.7 m 638 A/cm-w @0.9 m Long tape 325 A/cm-w @20 m 187 A/cm-w @68 m Ic x L 6,500 Am 12,716 Am This graph shows Ic distribution of long SmBCO samples fabricated by EDDC. In 2008, high Ic was obtained but as you see here many critical defects were observed. In 2009, Average Ic level was enhanced and the number of critical defects was reduced. So, we tried to improve the Ic uniformity but we found Ic level was decreased. As a highest critical current of SmBCO we obtained 638 A/㎝-w for 3 micron thick sample. 2008 CC : High Ic was obtained but many critical defects were existed. 2009 CC : Ic was enhanced and the number of critical defects was reduced. Ic was decreased but its uniformity was improved in 60 m long section.

6 Jc-B-Θ property of EDDC - SmBCO CCs
We evaluated in-field property and angular dependency of Ic for our SmBCO samples. As a comparison with commercial YBCO CC, our SmBCO exhibits higher in-field property in these temperature conditions. In our EDDC process, we did not dope any material for artificial flux pinning. But we found dominant enhancement of c-axis flux pinning as shown here. Normalized magnetic field(H//c) dependence of critical current density( Jc) Jc-B property of EDDC-SmBCO was found to be superior compared with commercial YBCO EDDC-SmBCO without any doping shows c-axis flux pinning effect but its relationship with microstructure is not clear.

7 Motor & tension control
Continuous High Speed Transport Ic Measurement (HSTM) system Current control to keep the measured voltage as critical voltage criterion Reel to reel system & DSP control / High speed Ic meas. > 400 m/h PI DAC Vref (Critical voltage criterion) Current for P/S to HTS conductor K*V1/n + V:measure voltage P/S current reference  critical current (Linearization of the control voltage) Current lead - HTS conductor Motor & tension control Voltage tap Current tap In the practical production line of cc, we think speed up of performance test is also very important. Recently we developed high speed transport Ic measurement system. Main principle of this system is that we control the current to keep the measured voltage as critical voltage criterion. Conventional R2R Transport Mes. Conventional R2R hall sensor Mes.

8 New non-contact type Ic measurement system
Gap(between hall sensor and superconducting layer) dependency of Ic is smaller for new system Calibration point Applied magnetic field Super current flow CC tape I+ I- X Z Y Cross sectional view I+ I- Noise So, we recently developed new system based on ampere law. The principle is line intergration of magnetic field for two loops around the tape crosssection. We found 실제 자장을 측정하는 구간은 그림에서 파란색 화살표, 제일 왼쪽끝 자장은 적분구간을 크게하면 거의 제로가 된다. 핵심은 중심부에서 Bz(수직자장)을 구하는 것이다.(특허) 기존의 방법은 h(초전도층과 센서사이 간격)에 민감하게 변하나 새로운 방법은 적분 루프안에 전류량의 절대값을 측정하기 때문에 원리적으로는 간격에 의존하지 않는다. Using Ampere law Define A= line integration of magnetic field of left loop B= line integration of magnetic field of right loop From the scanning magnetic field, Ic= 78.2 A From the conventional 4 probe method Ic= 84 A The deviation is caused by the noise of data

9 Properties of IBAD template (SuNAM)
In-plane texture of buffer layers Multi-turn IBAD system with max. spool size ~ 2 km. Df of MgO (220) in production : 7 ~ 8 o . IBAD-MgO Homo-epi MgO

10 R2R – RCE system by SuNAM Heater Use of inexpensive metal source.
High rate deposition ( > 10 nm/sec) Process speed : < ~ 600 m/hr. Optimization underway. E-gun (30 KW) 29 Multi-turn R2R QCM Metal tape Y, Sm Cu Ba computer Feedback program Source for metal evaporation : 30 kw pierce e-gun Substrate transportation : Multi-turn R2R system, more than 20 turns

11 Ic properties of GdBCCO CCs by R2R-RCE
SUNAM Min Ic : 220 A/cm-w Ave Ic : 298 A/cm-w Max Ic : 340 A/cm-w Min. Ic : 265 A/cm-w L : 120 m Measured by HSTM V-V distance : 60 cm GdBCO Surface after annealing

12 High Critical Current GdBCO CCs by R2R-RCE
SUNAM

13 REBCO CCs by EDC and R2R-RCE
Ic of 637 A/cm was achieved for 3 μm-thick EDDC-SmBCO CC. But, critical defects due to de-lamination were observed for long CC tapes. High performance Ic measurement systems were developed. New hall sensor measurement system using Ampere law High speed transport measurement (HSTM)system R2R Pilot line for the production of CC was installed in SuNAM Co. De-lamination problem was resolved for R2R-RCE CCs R2R-RCE process for high & uniform Ic of GdBCO CCs was established Min. Ic of 220 A/cm-w at 77 K for 200 m-long CC Highest Ic of 510 A/cm-w at 77 K for short sample

14 Development of HTS Cable
HTS Cable by LS Cable Development of HTS Cable HTS Cable of LS Cable DAPAS Project in Korea - Project period : 2001~2011 - Total budget : $146million (Gov. : $100million / Industry : $46million) - Participant : LS Cable, KEPCO, KERI 22.9kV 50MVA - Location : KEPCO’s I-cheon Substation - Development : 2008 ~ 2011 - Length : 500m - Accessory : 2 Termination, 1 Joint, Cooling system - Equal to 5 circuit of Cu cable 22.9kV 154kV 1GVA - Type test, 2010 (Gochang Power Testing Center) - PQ test, 2011 - Real grid application : 2012 ~ - Equal to 6-8 circuit of Cu cable 154kV 22.9kV 50MVA 154kV 1GVA Accessory ** DAPAS : Development of Advanced Power system by Applied Superconductivity tech.)

15 Real-grid application
HTS Cable by LS Cable - milestone 22.9kV HTS Cable has been developed and new project deploying on Real-Grid started . 154kV 1GW HTS power cable is under development till (Type Test) / 2011 (PQ Test) Milestone 2004 2005 2006 2007 2003 2002 2001 1st Phase 2nd Phase Fundamental Design Single Core 30m 50MVA/30m 3-Core 50MVA/100m Fab. Evaluation. 1,000MVA 2008 2009 2010 3rd Phase Evaluation Type test 22.9kV 50MVA, 500m Real-grid application (I-cheon Substation) DAPAS (MEST) Year 154kV 22.9kV 1ST Proto TYPE NEW Project (MKE) Application Type Test PQ

16 HTS cable application – 22.9 kV, 500 m
Cooling System Termination 3-Core HTS Cable

17 HTS cable (Underground part)
HTS cable operation by KEPCO Splicing Termination HTS cable (Underground part) Cryogenic system 154/22.9kV M.TR (#5) DS CB HTS Cable 500m 50MVA HTS cable HTS cable circuit 22.9kV, 50MVA, 500m HTS Cable layout (Ichon SS) 22.9kV, 50MVA, Real Grid Project Route length : 500m Location : KEPCO’s I-cheon substation Installation & Commissioning : 2010 Operation : 2011 ~

18 154 kV HTS cable 154kV 1GVA - Type test, 2010 (Gochang Power Testing Center) - PQ test, 2011 - Real grid application : 2012 ~ - Equal to 6-8 circuit of Cu cable - World best power transmission performance acquisition (1GVA) A 154kV 1GVA HTS termination was designed, manufactured, and successfully tested in accordance with IEC Extra DC voltage test was performed successfully

19 Withstand Voltage Test (14 kV Termination)
Test Item Test Requirement Result AC Voltage test with LN2 Level Level 1 (General Point) -Interface at Upper of Spacer AC225kV/15min Pass Imp.±750kV /10times Imp.±800kV /3times Imp.±850kV Imp.±900kV Level 2 (Weak Point) Middle of Spacer DC Voltage test DC 220kV/10min DC300kV/10min

20 Peak current limitation
Hybrid SFCL - evolution Superconductor HTS + SW Hybrid (1/2 Hz limiting) Hybrid (1/2 Hz non-limiting) PCL Hybrid Possibly useful at medium voltages HTS Reactor S/W HTS Reactor/Limiter VI SB DC HTS Power fuse ? Peak current limitation Reactor/Limiter VI SB DC HTS

21 14kV/12.5kArms, 1 phase fault test
Fast switch enabling a FCL 14kV/12.5kArms, 1 phase fault test step 1 : fast fault detection step 2 : triggering mechanical fast switch immediately through the controller, by a capacitor bank energy step 3 : initiating to open and generate arcing of the contact at the same time step 4: interruption of main circuit when current become zero step 5 : commuted to parallel current limiting resistor

22 FCL – Peak current limiting type
Concept of the PC-FCL Double line commutations  2 stage current limitation S1 to limit the fault current for the first ½ cycle upon fault S2 to limit the fault current after the first ½ cycle Reducing the voltage stress of the S1 switch through a parallel resistor Peak control(mode-1) Type 2(mode-2) Mode 1+2

23 Real circuit for the PC-FCL
Peak current controlled FCL by semiconductor SWs Simulated wave Real circuit for the PC-FCL Use one or multiple module of an IGBT and a resistor in parallel

24 14kV/12.5kArms, 1 phase fault test (S2) Mechanical fast switch
Peak current controlled FCL 14kV/12.5kArms, 1 phase fault test CT CLR controller (S2) Mechanical fast switch Fast fault detector PCR Rogowski coil Driver (S1) Solid state module


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