High Temperature Superconducting Magnetic Energy Storage and Its Power Control Technology
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JOURNAL OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA,VOL.6,NO.2,JUNE 2008 l37
High Temperature Superc0nducting Magnetic Energy
Storage and Its Power Control Technology
Xiao—Yuan Chen,Jian—Xun Jin,Kai-Meng Ma,Ju Wen,Ying Xin,Wei—Zhi Gong,
An—LiIl Ren,and Jing—Yin Zhang
Abstracb---High temperature superconducting(HTS)
power inductor and its control technology have been
studied and analyzed in the papen Based on the results
of simulations and practical experiments,a controHed release scheme has been proposed and verified for
developing a practical HTs sMEs prototype.
/ndex Terms---Electronic switch, SMES,high
temperature superconducting O-ITS)inductor,uninter-
ruptible power system(UPS).
1.Introduction
The power inductor energy storage technology has
important applications in the modern scientific and
technical field,i.e.,high—energy physics,high-energy laser,
electromagnetic propulsion,etc.Superconducting magnetic energy storage(SMZs)devices can store the excessive
electronic energy as electromagnetic energy in the
superconducting inductor and release the stored energy if
required.The advantages of SMES devices comparing with other energy storage devices include hi:gh energy storage
density,high energy storage efficiency,long application life-time and few environmental pollution.With the
development of applicable high temperature
superconducting(HTS)materials,SMES technology has
been progressed actively and is expected to apply in commercial applications[1】_[4】. In mis Paper,a I-ITS inductor design is introduced,with
its geometry design and magnetic field analysis presented.
Based on the results of simulations and experiments,a
controlled release scheme is proposed to discharge the
Manuscript receivedMarch l,2008;revisedApm l,2008. X.-YChen,J.-X.Jin,K.-M.Ma,J.Wbn arewiththeCenterofApplied Superconductivity and Electrical Engineering,University of Electronic Science and Technology of China,Chengdu,610054,China(e-mail: cxy_yjs( ̄ahoo.corn.cn'jxjin@ueste.edu.cll and hanqinmotmt@sina.corn. cn 83201229). YXin,W-Z.Gong,A.-L.Ren.and J.-YZhang a withDepartmentof Development of Innopower Superconductor Cable Co.Ltd.,Beijing, 100176,China(e-mail:yingxin@innopower.corn, gong weizhi@ innopower.corn and ren anLin@innopower.com). stored energy steadily and a simulation analysis on an
uninterruptible power system(UPS)is also presented to verify the controHed release scheme for SMES applications.
2.HTS Inductor Design
In this section,three HTS solenoid coils with different configurations are designed and analyzed.A common
configuration ofHTS solenoid coil is shown in Fig.1.
2.1 SpeciIicati0ns 0fHTS Conductor
Practically.Bi-2223 multifilament HTS tape conductor
is chosen to deign a HTS solenoid coil.Its main specifications are"width a is 4.23—m—m.thickness b is 0.23 innl,critical current厶is 100 A(77 K,0 T),and critical
current density 3,is 10kA/cmz.
2.2 Inductance Calculation
A formula for inductance calculation is given by【5】
and canbe expressedas follows
=2zr,u0N2R ̄T(p,g) (1)
where =4=x10-7,parameterⅣcisgivenby
N (2)
where N is the number of coil tams,and ,g)is the function ofs ̄e ratiop(=R2/R1),q(=D/RO.
Accordingto(1)and(2),thereis
2 ,g)[ N J.(3)
Considering the filling factor K for practical design,there is
Nab=( 一Rt)DK. (4)
The total length ofconductors S is given by
… + )]
2.3 Design of HTS Solenoid Coils
For practical design of HTS solenoid coil,t
hree 维普资讯 http://www.cqvip.com 138 JOURNAL OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA,VOL.6,NO.2,JUNE 2008
different coils with sanle inner radius R1 and section area
(R2-Rj are analyzed in this section.The main geometries of the three HTS solenoid coils are shown in Table 1.
× ×
\
Fig.1.Scheme ofHTS solenoid coils
Table 1.Main geometries ofthe three HTS coils
A.Case 1 From Table 2,the size ratios ,g)in Case 1,2,and 3
are(2,1),(1.5,2),(3,0.5),respectively.According to【61, p,g)in Case 1,2,and 3 are 0.3290,0.2046,and 0.5028,
respectively.A solenoid coil having the size ratio of(2,1)is a so—called Brooks coil,which can give a maximum inductance for a given 1en ̄nh of conductor.
In the design ofCase 1.the HTS coi1 should be wound with a certain insulating layer.The tota1 width and
thickness of Bi一2223 HTS conductor with insulating 1ayer
are 6 mm and 0.6 mm,respectively.Therefore,a reasonable
filling factor is 32.2%.Referring to(3)and(4),the inductanceL1 inCase 1 is 1H andthenumber oframsN1 is
2186.Referring to(5),the total length of HTS wires S1 is 1668m. To realize some magnetic specifications of the designed
coil,QuickField software is introduced.Assume that the
current through the designed coil 11 is 100A,the magnetic field distribution is generated as shown in Fig.2.