8/8/2019 Tech Storage
1/268 EnErgyBiz magazinE July/August 2007
Our TakeLettersFinancial Front
Technology FrontierIntroducingMetricsLegal EagleFinal Take
enrgy Storag Brakthroughsan evolving teChnology for managing the
grid
by miChael w. howard and haresh Kamath
FroM The eArLiesT day f t lctc ytm, ngytag a bn cndd an mtant
tcnlgy f managng t
gd. Tday, t cangng ay n c lctc gnatd and
d a makng tag vn m attactv tan bf. T aa-
anc f n, m ct-ffctv tcnlgy tn makng t lkly
tat ngy tag ll fnally bcm a alty n t na ft.
T lctc gd at a an nm jt-n-tm dctn and
dlvy ytm, t gnatd at t am tm t cnmd,
and t lttl tag f lctcal ngy. T man tat t tanm-n and dtbtn ytm mt
b blt t accmmdat maxmm
fl at tan avag fl, ltng n ndtlzatn
f at. engy tag can mv at tlzatn, nanc t
ntk lablty, nabl m ffcnt f balad gnatn, and
t a g ntatn f ntmttnt nabl gnatn.
engy tag xt n many lctcal
ytm. in t untd stat, abt 2.5 cnt
f lctcty tat a tg t ntk a
bn td. pmd yd faclt, t fm f
lag-cal tag mt famla t tlt, -
nt mt f t tag. pmd yd all t
tag f nm qantt f ngy, tg t
q a g ntal nvtmnt. Cmd a
ngy tag (CAes) a l-dly mlmntdtcnlgy tat ff-ak nabl lctcty
t cm and t a, c can lat b d
t gnat t lctcty. sc tcnq cld
b d t t nabl ngy f cnvnnt
datc at lat tm.
8/8/2019 Tech Storage
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sbcb tday at .ngybzmag.cm
st-datn tag tcnlg c a ltacaact
and flyl av n t alcatn, c a t n
c and ngy qmnt a nt lag bt n t
tag xctd t a gat dal f cyclng. sc tcnl-
g can b d t add -qalty dtbanc and
fqncy glatn, alcatn n c nly a f klatt t
mgaatt a qd f a f cnd mnt.
A gat dal f fft a gn nt t dvlmnt f
lctcmcal batt. utlt a famla t lad-acd
batt c a xtnvly d f back n bta-
tn and lant. in lag-cal alcatn, v,
t batty cmt c a dm lf and vanadm
dx fl batt a m ffctv. extnv ac and
dvlmnt nvtmnt n t tcnlg av bgn t
ay ff, and val cnt ntallatn a dmntatng t
vablty f batty ngy tag n alcatn c a akavng f tanmn and dtbtn at
dfal.
Ltm-n batty tcnlgy a ld nabl t
tabl lctnc vltn and m t d t am
n t tantatn makt by nablng lg-n ybd lctc
vcl (pheV). T dad adtn f pheV ld av
gnfcant ffct n t tlty ndty. if 2 cnt f vcl n
t untd stat lg-n ybd by 2020, t ld man
2 mlln pheV ld xt n t gd. T nt a cag-
ng lad aacng 40 ggaatt. Amng c cagng
ld b dn maly at ngt, pheV ld dc t dnal
flctatn n lctcal lad. in m cnct, pheV mgt
al b d a dtbtd ngy tag ytm, dcagng
ngy back t t gd n ncay. sc a dvlmntcld tntally gv tlt acc t
ggaatt f n
dmand.
wat mgt a tlty ytm bad n c tcnlg
lk lk? Lag-cal tcnlg c a md yd and
CAes may b d t t lag amnt f ngy gnatd
fm nd fam and t nabl c, allng t
ngy t b datcd n t ndd. Flyl mgt
b d t vd mnt-t-mnt fqncy glatn
l lag-fl batt vd m lag-cal amng
v val . statgcally lacd dm-lf batt-
cld a bttlnck n t dtbtn ytm tg
ak avng, l dcng dmand cag t ctm.
ultacaact lacd at btatn cld mtgat t ffct
f mmntay nttn n dtbtn fd. T mav
agggatn f pheV batt cld abb ngy dcd
by ncla balad lant dng t ngt and cld b d
t vd nnng v ctcal back t ndtal
ctm dng t day.
T al callng f ngy tag nt t t
bl, bt t ll b d. T n qtn tat
tag nt an tnty; t ll tak tatgy and
ndtandng f t tnty t mak t xltd t
t fll tntal.
Michael W. Howard is vice president of research at the Electric
Power
Research Institute and Haresh Kamath is project manager at
EPRI.
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