Joumal of Science and Technology N 170(8 2015) Military University of Science and Technology TOI iru HOA VAN HANH OA MUC Tl£U HE THONG DIEN NHO TAI CAC VUNG BI^T LAP Nguyin HOu Buc Bai bao trinh bSy b[.]
Trang 1TOI iru HOA VAN HANH OA MUC Tl£U HE THONG DIEN NHO
TAI CAC VUNG BI^T LAP
Nguyin HOu Buc
Bai bao trinh bSy bai toin t6i iiu da muc ti&i d6i vdi he thong di?n lai gom nang lucmg gio, mat troi, may phat diesel vi h? thong tich tiu nang luong duoi dang ac quy cung cap di§n cho c4c dio cung nhu cic vimg khong c6 kgt noi v6i luoi di?n chfah Ket qui bai bao chi ra each nang cao ch5t lugng van hinh 5c quy, nang cao dp tin cay cung cap di?n, giam chi phi
vi 6 nhiem moi trucmg
Tit Idioa: He thong Sc quy Uii thdi he Ihong phdt dien lai, ludi dien biet lap toi wu
1 Gidd thieu
Su tang ttudng m^mh me cua cac ngudn nang lugng tai tao chi ra ring nang lu(>ng tai t ^ se la mgt phin quan ttgng ciia rat nhieu h? thdng dien ttong tuang lai khdng xa, Tuy nhien, khi ti ttong cdc nguon nang lugng tai tao cang cao thi ciing dat ra cac bai
t o ^ khd khan cho cac nha van hanh do tinh khdng on dinh cd huu ciia chung Tai cac
hki dao ciing nhu cdc vung khd khan cho viec lay di^n tur h^ thdng di^n chinh thi vi^c sir
dtmg hgp ly cac ngudn nang lugng l^i cdng ddng mdt vai ttd quan ttgng lam giam sir phv thugc vao cac nhien lieu hda thach, thudng la dau diesel [1-3] Su phat tiiln cua cic ngudn nang lugng mdi da md ra co hdi cho vi?c ting d\mg cdc hd thing tich tru nang lugng, djic biet Id he thing tich trii nang lugng dang dc quy Uu dilm cua vi?c kit hcrp h$ thing Sc quy vdi cac ngudn nang lugng mdi dugc trinh bay ttong [4-10] Cdc tai liju [6, 7] chi la ring cd thi su dung he thong ac quy dl phan phdi dien tit cac ngudn nang lugng mdi va gidm cac hi?u iing tieu cyc ddi vdi chit lugng dien nang do tinh gian doan cua cdc ngudn nang lugng mdi gay ra
Bai bao trinh bay mdt chiln luge vjn hdnh tdi um cho he thing difn lai gdm cac ngudn nang lugng gid, mat trdi, mdy phdt diesel kit hgp vdi he thdng dc quy cd xet toi cdc rang budc vl d nhiem tji cdc khu viic biet lap He thdng dc quy dugc van hanh dl dap ling da nhi$m vy gom tdi thilu hda chi phi van hanh mdy phat diesel bdng viec sii dting toi da cdc ngudn nang lugng mdi, dam bao can bing cdng suit, dilu khiln tin sl, dien
ap, Cdng suat nang lugng ciia h$ thing ic quy se gdm phin dy tm ndng lugng duong va
am de h?n che dac tinh biln dgng theo thdi tilt cua cac ngudn nang lugng mdi cung nhu \ fui
dam bao viec sii dyng may phdt diesel la toi thilu, Phuang phap dugc tiln hanh tten pMn mem Matlab, cac kit qud md phdng cho thiy hieu qud ciia phuong phdp dl xuit
' Dili hoc Di?n luc
Trang 22 Thu^t ngir
T - thdi gian tien hdnh tdi im (gid)
F('Pdg(0) - hdm chi phi nhien U|u cua mdy phdt diesel
Co, Cl, C2 - cdc h$ so chi phi nhien li?u
/'dg(0 - cdng suat phdt ciia may phdt diesel
Pvt (t) - cdng suat phdt cua h$ thong bien ddi nang lucmg gid
•Ppv(0 - cdng suit phdt cua he th6ng nang lugmg mat trdi
Pb(t) - cong sudt trao ddi gjua h$ thdng dc quy vd thanh cdi AC
P](t) - cdng suat nhu cdu cua phy tdi
^Renew(0 " cdng sudt phdt cua cdc ngudn nang lugng mdi
^bmin - cdng sudt gidi han dudi cua cdng suat he thong ac quy
Pbmax - cdng sudt gidi ban trSn cua cdng suat he thdng ac quy
^dgmin - cdng sudt gidi ban dudi cua cdng suat may phat diesel
-Pdgmax - cdng sudt gidi ban tren cua cdng sudt mdy phdt diesel
^min-dg - cdng suat gidi ban dudi cua mdy phdt diesel cd xem xet trao ddi cdng suat acquy
^max-dg - cdng suat gidi han tren cua may phat diesel cd xem xet trao ddi cdng suat acquy
DOD - dp sau cua vi$c phdng cua h$ thong dc quy
Eb - cdng sudt tich trtr cua h? thdng dc quy
£"60 - trang thdi nap ciia ac quy tai thdi diem ban ddu ciia qua trinh tdi uu hda
Pb-ia{l) - cdng suit trong cua h$ thdng dc quy
Tjdis - hidu suat phdng ciia dc quy
;;ch - hieu suat nap ciia dc quy
ERCS - t^ng lu^ng dy trft trong h6 thdng ac quy
AfRcncw - dp khdng chac chdn cua cdng suat phdt tii cac nguon nang lugng mdi tinh theo gid
APw - ^9 khdng chdc chdn ciia cdng sudt phdt tix ngudn nang lugng gid
APpv - dp khdng chac chan cua cdng suat phat tii ngudn ndng lugng mat trdi Afi - do khdng chdc chdn cua nhu cau tieu thy phu tdi
Trang 3ATg,, - thai gian yen ciu md lugng du ttu phai dam bdo sin sang
Boc- lgi ich t i viec tilt ki$m nhien li?u
BR™W - lgi ich cd dugc tu vi?c gidm d nhilm mdi ttudng
BEM - lgi >ch thu dugc tu vi$c tan dyng cdc ngudn nang lugng mdi
JpQ - lgi ich thu dugc tii vi?c nang cao chit lugng didn nang
3 M6 ta he thong diSn lai
Hinh 1 Saddh? thdng dien lai
He thing dien lai bao gdm cac ngudn nang lugng gid, mat ttdi va cdc mdy phai diesel H$ thing ic quy dugc tich hgp vao he thong dien nhim han chl dac tinh phj thudc thdi tilt cua cdc ngudn nang lugng mdi, ddng thdi giam vi?c tidu thy diesel, qua
dd giam d nhilm mdi trudng, tdi thieu hda chi phi van hdnh Ngoai ra, he thing dc quy cdn cd thi dugc iing dyng trong cac iihi?m vy khde nhau nhu diln khiln di$n ap, cung cap nang lugng du tru, san bang phy tdi Hinh 1 md td h$ thdng di?n lai vd cac d6ng cdng suat tuang ling cung cip di|n cho phy tdi d khu vyc bi$t lap vdi ludi di$n chinh Gid thiet rang cac ngudn nang lugng gid, mat ttdi, h | thing ic quy, may phat diesel, tai dugc ndi vdi thanh cdi dien xoay chilu Mdy phdt dien gid dugc nli trye tiep vdi thanh cdi AC He thdng pin mat ttdi dugc ndi vdi thanh cdi AC qua mdt bd bien doi mdt chieu thanh xoay chieu (DC/AC) Mdy phat diesel dugc ndi trye tilp vdi thanh cai
AC He thong ac quy Vanadium Redox (VRB) dugc su dung va dugc ndi qua mOt b9 biln ddi mot chilu thanh xoay chilu trudc khi ndi vdi thanh cai AC He thong ac quy VRB dugc sii dyng bdi vi cdng suit va nang lugng cua dc quy cd the dugc chgn mot each ddc ldp vdi nhau, do dd ta cd thi chgn dung lugng cho he thong dc quy mgt cdch tdi uu Chiln luge vjn hanh cho he thing dien lai nay la sii dyng tti?t dl cac ngnSn
Trang 4ndng lugng sach va do vdy gidm chi phi van hdnh ciing nhu khi thai ra mdi tnrdng bang
viec ling dyng h? thong tich trir nang lugng dudi dang ac quy
4 Chien lirgrc v^n hanh hf thong difn lai
A Phumtgphdp
ThuEit todn tdi uu ndy dugc thdnh lap vd thye hien trong phan mSm Matlab Bdi
todn la tdi uu phi tuyen cd rdng budc va sir dyng phuorng phdp lap trinh binh phuong
lien tyc De xay dung bdi toan, mpt sd gid thiet sau dugc su dyng:
- Cdng suat cua cdc nguon nang lugng gid va m^t trdi dugc dy dodn theo tiing gid
Id san cd Dp sai sd ciia dy doan dugc cung c ^ dudi dang ti le phdn tram ciia cong sudt
lip ddt
- Dudng cong phdt dien cua may phdt diesel va cdng suit tieu thy dy doan ciia
phy tai cung san cd
- Cac dac tinh ky thudt ciia he thdng ac quy nhu cdng sudt, ndng lugng, miic do
phdng, hidu suit phdng, s^ dugc cung cdp
- Cac ket qud ciia qua trinh toi uu hda Id bieu dd cdng suat phat theo gid ctia he
thdng ac quy, bieu do trang thdi s?ic ciia dc quy, bieu dd phdt dien theo gid cua may phat
diesel, chi phi vdn hdnh toi uu hda ciia h$ th6ng d i ^ lai, hxgng khi thdi CO2,
NOx-B Bdi todn
Myc tieu ciia bdi todn Id ddm bdo dp tm cay cung cap di^n vd sii dung tdi da cac
ngudn nang lugng mdi, do vdy se ddn tdi chi phi van hdnh va hrgng khi thdi la tdi thidu
Do vdy, ham myc tieu ciia bdi todn Id ^ i thieu hda chi phi van hdnh vd dugc md ta nhu sau:
min(i;F(P^(())) (1)
(=1
Hdm chi phi nhien lieu dugc xdc dinh theo cdng thiic sau:
'''-^^'^%p ^mm~p^it))rj^ /i<0 ^^^
Hilu theo mdt each khde thi ndng lugng tu mat ttdi va gid se dugc dilu do mdt
cdch tdi tm nhd cd sy giiip dd cua he thdng 5c quy Nhu vay, tieu thy nhien lieu se Id
nhd nhit Dilu ndy dan tdi chi phi van hanh ciia he thdng va lugng khi thdi ciing se la
toi thilu Ham myc tiey se chiu cdc rdng buoc sau;
1) Can bing giua cdng suat phdt va nhu cau ciia phy tdi tai timg thdi dilm:
pjt)+p^(.t)+p^(.')+n(.>)-pfi)=o (3)
Trang 5P.^«)-PM + P^(') <") Phuong trinh (3) dung vdi mgi thdi dilm Pt, cd hai hudng tuy theo thdi dilm h?
thdng dc quy la nap hay xa nang lugng Nlu he thing ic quy d hang thai nap dien thi dau
cua fb la am, vd ngugc lai nlu Sc quy d ttang thdi phdng thi cdng suat Pb cd dau duong
2) Cdng suit trao ddi giua h? thing ic quy va thanh cdi AC dugc xdc dinh theo
cdng thiic sau:
P,.i') = -P,^(.t)-P^(l)+P,(t) (5)
Do cdng sudt ciia h? thdng dc quy phdi ndm trong gidi ban cho phep nen se cd cac
rdng bu$c bit phuong trinh sau:
P,^^P,(')^P^ (6)
Thaythe(5)vao(6):
^ta„S-.PR™w(')-P^(0 + W ) £ C (7)
Rang huge ndy trd thanh:
^*(')£-/L. PR »(') + flW (8)
P6,(.l)i-P^-P^.^(.t) + Pft) (9)
3) Cdng suat phdt ciia mdy phdt diesel cung phdi nim trong gidi ban nha sdn xuat
cho phdp:
V ^ ' ' * ( ' ) S - P d ^ (10)
Do vdy, hai gidi ban cdng suit mdi ddi vdi cdng suit may phdt diesel dugc xac
d)nh nhu sau:
/ L ^ =niax(-P^ -P.m-P^O + PMP.,^) (11)
^™<-*=n>i>(-f^-/'.«)-P^«) + / > ( 0 , P ^ ) (12)
^™-as S P j , ( O S / l , ^ , (13) Cdc rang budc nay phai ddp ling tai mgi thdi dilm van hdnh
4) Tl?ng thdi nap cua dc quy phai nim ttong gidi han cho phep Theo ddng cdng
suat nhu hinh 1, ham myc tieu phdi chiu them rang budc sau:
E,(l-DOD)<E^-f^P,^^(,)<E, (,4)
Cdng suit cua he thing ic quy xet tdi cd hieu suit thai va nap dugc tinh theo cdng
thiic sau:
Trang 6P.-^{t)- (-P^(t) + P,it)-P^it))/r}^ P^>0
P < 0 (15)
Hai rdng bupe bat phuorng trinh ndy phdi dugc ddp iing tai mgi thdi diem van hdnh
5 C^c kit qua mo phong
A Cdc gid thiet vi h§ thdng
De md phdng kiem chung phuorng p h ^ de xuit tren, ta gid thiet rdng he thdng dien bao gom cdc thanh phdn sau: Hai tua bin gid cdng sudt dinh miic 100 kW, he thdng ndng lugng ra^t trdi cd cdng suit 50 kW, may phat diesel vdi cdng suit dinh muc 250 kW, mdt h? thong dc quy VRB cdng suit la 200 kW va ndng lugng dinh muc la 500 kWh Cac hi^u sudt n^p vd phdng ciia ac quy ldn lugt Id 90% vd 80% Dp phdng sau (DOD) Id 80% Do
sy khdng chdc chan cua cac ngudn nang lugng gid vd mat trdi nen he thdng ac quy dugc phan bd mpt phdn cdng suit dy tru duong vd dm Gid thiet rang dy dodn ve vi?c phdt dien Clia cdc nguon ndng lugng gid vd mgt trdi cd dp l?ch Id 20% so vdi cdng sudt dinh miic
Do v^y, cdc phin dy trii duong vd am se Id 50 kWh, trong do bao gdm 40 kWh la ciia ngudn nang lugng gid va 10 kWh Id ciia nang lugng mat trdi
Bdng 1 trinh bdy tdm tdt cac thdng sd ve h$ thdng dien Iai Miic dp thdi khi trung
binh COi vd NOx doi vdi mdy phdt diesel Idn lugt Id 2,64 kg/L and 13 g/kWh [11] Tign
phat do d nhiem mdi trudng gid thiSt Id 3 c€/kg CO2 vd 1 c€/100 g NOx
Bdng 1 Cdc thong so chinh ciia h^ thong
Thanh phdn
May phdt diesel
Tua bin gio
Mat trdi
He thong dc quy
Tai
Thong so
250 kW
200 kW
50 kW
500 kWh, 200 kW: +Dy tru 50 kWh DOD: 100 kWh
Cong suat van banh: 300 kWh Cong suit max: 204 kVA
He so tdi: 0.85
Ludi di?n cd dien dp thdp theo tieu chudn CIGRE dugc chpn Id tdi vdi dudng cong phy tai nhu hinh 2 [12]: Cdng suit ldn nhit cua tdi Id 204 kVA vd he sd tdi la 0.85 Dudng cong md td tieu thy ndng lugng cua may phat diesel dugc the hi?n tren hinh 3 Hinh 4 md td dy bdo phdt di?n tii cac nguon nang lupng mdi
Trang 7Hinh 2 Bu&ng cong tieu thu cUa phu tdi Hinh 3 Dudng cong tieu thv nang U
cua mdy phdt diesel
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r — 1 1 1 1
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1 Solar 1
, , , r ~ T — i i l !
: 03 04 05 M I 21 22 23 00
Hinh 4 Dyr bdo cong sudt phdt cua cdc nguon ndng lufmg m&i theo ngdy
Ba boi cdnh khde nhau dugc md phdng Trudng hgp thii nhit, tai chi dugc cung cdp bdi may phdt diesel, ddy la trudng hgp co bdn Trong trudng hgp nay, qua trinh toi
uu khdng dugc thye hien Trudng hgp thu hai, cac ngudn nang lugng mdi vd may phat diesel cimg cung cdp di?n cho phy tdi Ddi vdi trudng hgp ndy thi qud trinh tdi uu cung khdng dugc tien hdnh Trudng hgp thu ba, h? thdng ac quy dugc tich hgp vdo cung vdi may phdt diesel, cdc ngudn ndng lupng mdi de cung cdp cho nhu cdu phy tdi Bdi toan tdi uu dupc tien hdnh de tdi thieu hda chi phi van hdnh vd khi thdi d nhilm mdi trudng
B Tnr&ng hgp 1: Cung cdp di§n phi/i tdi bdng mdy phdt diesel
Trong trudng hgp nay, may phdt diesel chiu trach nhiem cung c i p dien cho phu tdi H$ thdng di?n khdng cd cdc nguon nang lugng mdi cung nhu he thdng dc quy Dya theo cdc gid thiet d phin tren, cdc ket qud md phdng dugc tdm tdt trong bang 2
Bdng 2 Tom tdt cdc ket qud mo phong khi chi mdy phdi diesel
cung cdp cho phli ldi
Nhien lieu (L) 716.9 CO2 (kg) 1892.6 NO.(kg) 30.883
Day la tiirdng hgp ca ban d l cac trudng hgp khac so sdnh
Trang 8C Tn^fng hfp 2: Cung cdp di$n cho ph^ tdi bdng mdy phdt diesel vd cdc ngudn ndng lirfrng mci
Trong trudng hgp ndy, cdc ngudn nang lugng mdi va may phdt diesel ciing cung cdp cho phu tdi Cdng sudt d u thira tii cdc ngudn ndng lugng mdi Id ldng phi Do tinh gidn doan ciia cdc ngudn nang lugng mdi, cdc may phdt diesel phdi dugc vdn hdnh lidn tyc tham chi ngay cd khi cac ngudn ndng lugng mdi du dap ung nhu ciu phy tdi Cdc kSt qud md phdng cho trudng hgp ndy dugc ghi trong bang 3
Bdng 3 Tom tat cdc kit gud mo phong khi mdy phdt diesel
vd cdc nguon ndng lti(mg m&i ciing cung cdp cho tdi
Nhien li$u (L)
470
CO: (kg) 1240.8
NO (kg) 16.225
Nang lugng mdi du (kWh) 281.5
Tii ket qud md phdng ta t h i y viec tieu thy nhien lieu Id gidm so vdi trong trudng hgp 1 Ngudn nang lugng mdi cung cdp 59,3% tdng nhu ciu phy tdi, nhung lugng nhien li?u tieu thy gidm chi la 27,5% Cdng suit du thiia tii cdc ngudn ndng lugng mdi vd vi§c van hanh mdy phdt diesel d trang thai dy phdng ndng trong 6 gid la cac nguyen nhdn chinh ldm gidm tinh hi$u qud cua cdc ngudn nang lugng mdi ddi vdi chi phi van hdnh
vd d nhilm mdi trudng
D, Tnr&ng hgp 3: Cung cap tdi bang mdy phdt diesel, cdc nguSn ndng lirgng m&i vd h^ thong dc quy
Trong trudng hgp ndy, cdc ngudn nang lugng mdi, mdy phdt diesel va h? thdng
dc quy cung cung cap cho tdi Bai toan tdi im md bdi bao trinh bdy se dugc thuc hi$n ddi vdi trudng hgp nay Bang 4 tdm tat cac ket qud md phdng
Bdng 4 Tom tdt cdc kit qua mo phong khi mdy phdt diesel,
cdc nguon ndng luong m&i vd ac quy cung cap cho tdi
Nhien li?u (L)
354.5
CO, (kg) 935.88 NO<(kg) 13.591 Phin nang lugng mdi mat (kWh) 78.82
Tieu thy nang lugng vd d nhiem mdi trudng ciia hd thing dugc gidm xuong T i n thit nang lugng ttong trudng hgp cd dc quy nhd ban rit nhilu so vdi ndng lugng du thira ttong trudng hgp 2 Vi he thdng dc quy cd t h i cung cdp di$n ttong trudng hgp cdng suit tit cdc ngudn nang lugng mdi gidm dot nggt, mdy phdt diesel lai dang nghi Hay ndi each khac thi cdng suit dy phdng ttong cac gid may phdt diesel nghi la tit 3c quy Cdng suat phdt cua mdy phdt diesel, cdng sudt vd ttang thdi nap cua i c quy dugc
Trang 9md td tten hinh 5 Tren hinh 5 ta thiy he thing i c quy dugc phdng thdp nhit t»i thdi dilm culi ngay va h? thing di^n dugc van hanh vdi tieu thy ndng lugng la nhd nhit
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P(lg(250kW) I-Pbat(200kW) 1 Ebat(500kWh}|
•^ ""oo 01 02 D3 04 05 06 07 OS 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 00
Time(h)
Hinh 5 Cong sudt phdt cda mdy phdt diesel, cong sudt vd trang thdi nQp cua he thong dc quy
Dya tren cdc phan du trir duong vd dm da dugc phdn bo, he thong ac quy cd the tham gia dilu khiln tin so tdi vd cdng suat phdn khdng cua h$ thdng trong cde trudng hgp qud dp Khi mdy phat diesel gap sy eo, h? thdng dc quy va cdc ngu6n ndng lugng mdi cd the ddm bdo sy cung cap di$n mpt each lien tyc cho mdt so phy tdi quan trpng Nbi^m vy ndy lam tang gid trj cua h? thong dc quy khi dugc iing dyng tai cdc vung xa xdi h o ^ ddo
6 K e t l u a n
Bai bdo trinb bdy bdi todn van hdnh tdi uu da muc tieu cho he thdng di^n Iai tai cdc viing bi^t lap Cdc ngudn ndng lugng mdi cung vdi may phdt diesel va he thong
ac quy cung cap cho phy tdi Bdi bdo tap tmng chi ra cdc kha nang md h$ thdng ae quy
cd thi ndng cao chit lugng v^n hdnh trong vi$c gidm chi phi vd 6 nhiem mdi tnidng ddng thdi ndng cao dp tin cdy cung cap dien,
T M li^u t h a m k h a o
1 R Hunter and G EUiot Wind-Diesel Systems: A Guide to the Technology and hs Implementation Cambridge U.K., Cambridge Univ Press, 1994
2 F Katiraei and C Abbey Diesel Plant Sizing and Performance Analysis of a Remote Wind-Diesel Microgrid in Proc IEEE Power Eng Soc General Meeting, June 2007,
pp 24-28
3 P Lautier, M Prevost, and P Martel Off'-grid Diesel Power Plant Efficiency Optimization and Integration of Renewable Energy Sources, in Proc IEEE Can Electrical Power Conf.,
Montreal, QC, Canada, Oct 2007
Trang 104 S C SnritiijP K Sexi,B.Kiopos)d Advancement of Energy Storage Devices and Appliaitions in Electrical Power System, in Proc 2008 IEEE Power and Energy Society Genwal Meeting
-Ccmversion and Delivery of Electrical of Electrical Energy in tbe 21th Century
5 H Ibrahim, A lUnca, J Perron Conversion and Analysis of Different Energy Storage Techniques Based on their Performance Index, in Proc Electrical Power Conf (EPC 2007),
IEEE Canada, 2007
6 K Qian, C Zhou, Z Li, Y Yuan Benefits of Energy Storage in Power Systems with High Level of Intermittent Generation, in Proc 20th Intemational Conf on Distribution, Part 1
(CIRED 2009) Prague, Czech Republic, 2009
7 S Faias, P Santos, F Matos, J Sousa, R Castro Evaluation of Energy Storage Devices for Renewable Energies Integration: Application to a Portuguese Wind Farm, in Proc 5th
Intemational Conf on European Electricity Market (EEM 2008), Libon, Portugal, 2008
8 K Ki-Hyeok, W Dong-Jun Power Management Strategy of Stand-alone Hybrid System to Reduce the Operation Mode Changes Transmission & Distribution Conference &
Exposition: Asia and Pacific, Seoul, 2009
9 A M Van Voorden, G C Paap The Use of Batteries in Stand-alone Renewable Power Systems Power Tech, 2005 IEEE Russia
10 R Chedid, S Rahman Unit Sizing and Control of Hybrid Wind-Solar Power Systems IEEE
Trans, on Energy Conversion, May 1997
11 www.dieselserviceandsupply.com
12 Benchmark Systems for Network Integration of Renewable and Distributed Energy Resources CIGRE Technical Brochure, Task Force C6.04.02,2011
Ngdy nhdn bdi: 28 thdng 6 ndm 2015 Ngdy nhgn bdn sua ldn cuoi: 01 thdng 8 ndm 2015