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The Jh International Workshop on Remote Sensing and
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RENEW ABLE ENERGY FOR LOCAL COMMUNITY:PERMORMANCE OF SOLAR
HYBRID SYSTEM IN THE GOBI
Amarbayar Adiyabat 1
NUM-SPE, Department o f Application Physics, School ofPhvsics
and Electronics, Sa tion al [Jniversity ofA ongoba, .
Address: k l l szuguuikn gudan f-J,
B a g a tobuu ,Sukhbaator district, Ulaanbaatar, },fongolzaCell:
~ 9 7 6 9 9 0 4 5 0 7 0 .Fax: T 976-11-329993, email: amarbayar.
fgmail.com
AbstractThis paper presents the results of a long-term
performance analysis of PV -hybrid system based on 5years
operational data from the field site of -oyon SOllllL Umnugobi
province. Mongolia projectsupported by New Energy and Industrial
Technology DeYelopment Organization of Japan (NEDO).The NEDO h s
performed demonstrative research on the independent dispersed PV
-hybrid systems:PV, 200kW. DEG (Diesel Engine Generator): 100kVA
*3set) from 2002 to 2004 in Mongolia. Themain purpose of this
project was to improve system reliability and cost performance on
the naturalconditions and distinctive social systems. which are
rarely seen in Japan.t has been observed that the high PV
penetration (during project period: 80.-l during 09/2003-
12/2007) 71 of total supplied energy. and the low system failure
ratio. On the other hand, averagePR(perfonnanceratio) indicated
0.20 (during project period). 0.14 (estimated values
between09/2003-12/2007) due to the limited demand and
distributed/grid-connected PV units (lOOkW)with the auxilicuy power
mode.
Introduction
The NEDO has performed demonstrative researchon hybrid type
photovoltaic (PV) power generationsystems from 2002 to 2004 at oyon
soum,Umnugobi province, Mongolia (see Figure 1). Themain purpose of
these projects was to improve system
reliability and cost performance on the naturalconditions and
distinctive social systems are rarelyseen in Japan [ 1].This paper
describes the results o f a long-term
Figure 1 Location of the Noyon soum center
performance analysis of PV -hybrid systems based on measured
operation data during projectperiod, and actual record data after
the project period.
System configurationThe system consists o f 4 dispersed
grid-connected PV units, 2 centralized PV units, 2 leadacid battery
units, central controller unit, and 3 sets of existing DEG (see
Figure 2). DispersedPV
units located at school ( 40kW), hospital ( 40kW), admin office
1 OkW), andtelecommunication station (lOkW). Modular PC (power
conditioner) 10kW employing multiunits build up systems were used
in each PV unit. PC (10kW*lOset) in a power center (PV100kW), were
separated into 2 lines (units) and each of them were designed to
connectstorage batteries (288kWh, 1000Ah*2V*144cell).Power
conditioners of two centralized PV units, alternately switch
between self-sustainedoperations and grid-connected operations by
orders of a central controller and carry outadjustment of PV
outputs and control of load sharing according as power demand
variation(figure 3). In this site, all of PV array are mounted at a
fixed angle (60 degree) and facingsouth (azimuth 0 degree).
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.Iem a tional Workshop on Remote Sensing and Environmenta l
Innovatio ns in Mo ngolia
dj
PV array Battery ~ ~ Diesel Gen.
~ ~ ~ t t j 88kWh*2 n t t ltoOkVA *3 set, ' : )oo,ft ;. 50kW*2
untt ~ .l . : ; . ~ Cent.Controller
AC380V
;::::
'V array ~ -- Q)--L-- Local Grid i~
12 24
DBattery charge by PV
D E G
D Battery dischargeL J PVsupply
f tgu re 2 S ys tem c onfigur ation of the N oyo n
fi eld siteF igur e 3 M ain operation mod e (P V+ B at and D
EG
switching operati on)
ysis nd methodfield data analysis is divided into 2 parts :
solar energy resource e valuation , and system
o rmance. For evaluation of the solar energy resource, we use
monthly average irradiation ,irradiation variable ratio. The system
performance indices include reference yield, final
d. system performance ratio , PV penetration ratio.thi s
analysis , system operation data referred by 2 different source.
Main data is measuredration data during the project period (09
/2003-03 /2005) , which was provided by an
plementer of the NEDO project The actual data recorded after
project period (04/2005-~ 7
which was obtained by a follow-up survey at the field site .
Main operation datas measured every 30 minutes and stored in the
data loggers. Measurement items were aslows : incident global
irradiance in array-plane (tilt angle : 60 degree) , PV unit
outputs
Wh/30minut], battery input (charge) [kWh /30minut] , DEG output
[kWh/30minut] [ ]ar Energy Resource Indices : The horizontal and
in-plane irradiations [kWh/m 2/day] were
se d for the indices of solar energ y resource. stem Performance
Indices : All system performance data have been evaluated in terms
of
erational performance and reliability . The evaluation
procedures are based on the IECan dard 61724 [7].
Yr = H A I Gs J) YA = E A.d / P max 2)Yr = E zoad d P max 3) P R
= Yr Yr 4)
The reference yield Yc is based on the in-plane irrad iation 4
and represents the theoreticallyailable energy Gs per day and kWp.
The final V system yield Y 1 is the daily PV systemtput energy p to
the load per day and kWp , represents the number of hours per day
that
:he array would need to operate at its rated output power P max
to contribute the same dailyarray energy to the system as it was
monitored. The system performance ratio P R is the ratio
f PV energy actually used to the energy theoretically available
i .e . Y r/Yr . I t is independentf location and system size and
indicates the overall losses on the array s rated output due to
module temperature , incomplete utilization of irradiance and
system componentnefficiencies or failures [2 , 3].
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