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.