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Tap chi Khoa hoc va Cong nghe 102 (2014) 006-011 ' la ham trl &cn\ vi (ham tre sau mot chu ky lay mau), NEU e, la NS VA de, la NB Tffl AD, la NB NEU e, la NB VA de, la NB THI AD, la NB AD( la bi^n thien ciia khoang dan ciia van FET mot chu ky dong cat tai thai diem lay mau thii k Cuoi cimg cac tap m a dau sg dupe lam ro hoa bang phuong phap tam (Centre of Area/COA) nhir sau: I/'('(0)"(' I/'(-(0) Hinh So kh6i bp dieu khien logic ma dung de xac dinh thay doi ciia khoang dan ciia van FET mot chu ky dong cat (1) Trong p h u o n g trinh (1) ta co: xii) la gia trj thii / ciia khoang bien thifin ciia h a m lien thupc dau A D , , Khoi mo hoa (Fuzzification) lam nhiem vy chuyen cac dau vao (e^ va de^.) va ( A D , ) a dang gia tri ro cac ham lien thugc co dang hinh tam giac va hinh thang nhir hinh.4 Thong thuong, thuc te cac ham lien thupc hinh thang va tam giac dirpc chpn vai ly cac ham lien thupc dang d§ thuc thi va lam don gian hoa dang ke qua trinh suy luan mir / i ( x ( / ) ) l a gia trj h a m Hen thuoc ciia b i l n AD, lingvoi x{i), •^coA '^ S'^ tti ciia bien thien dau AD, sau lam ro hoa Dpng CO suy lu£in (Inference Engine) bao gom 25 quy tac quan he giija dau vao (e^ va de^.) va dau (AD,,) duac trinh bay nhir tren bang I !, mm ,0 04 -0.02 0.02 0.04 e, max Bang I Bang cac quy tJc de PB PS ZZ NS NB NB ZZ NS NS NB NB NS PS ZZ NS NS NB ZZ PS PS ZZ NS NS PS PB PS PS ZZ NS PB PB PB PS PS ZZ I -SO Trong bang, 1, y nghTa ciia cac chii viet tat tieng Anh nhu sau: NB 40 NS (b) 40 MF ZZ PS 80 de,mxi PB NB: Negative Big (Am nhilu) NS, Negative Small (Am it) PS: Positive Small (DuoTig it) 0.02 0,04 AD, max AD, 0.04 -0.02 (c) ZZ: Zero (Khong am va khong duong) Hinh Cac ham lien thupc: (a) Cac ham hen thupc ciia bien e,, (b) Cac ham lien thupc ciia bien t/e,, (c) PB: Positive Big (Ducmg nhi6u) Cac ham Hen thupc cua bien ADk Tai mot thai diem nhat dinh, theo bang, ta co mot so cac quy t5c mo duac trinh bay nhu sau: Tbirc ngtiiSm NEU e, la PB VA de, la NB THI AD^ la ZZ He th6ng nap kc quy su dung nang lirpTig mat trcri duac trinh bay nhu tren hinh 5, bao gom: NEU e, la PS VA de^ la NB THI AD, la NS 1- NEU e, la ZZ VA de, l a N B T H I AD, laNS Mot bp thu thap dQ heu 14 bit NI USB-6009 ciia hang (National Instruments/NI) [8] vdi dau vao tuong tir de dien ap va dong dien ciia bang Tap chi Khoa hoc va Cong ngh$ 102 (2014) 006-011 pin mat troi, dau tucmg tir dtia den chan dau vao tuong tir ciia vi dieu khien dsPIC 2- Toan bo thuat toan dieu khien dupe viet bang ngon ngir C, Phan mem Pelles C [10] dupe su dyng de bien dich ma ngu6n C cac file a dinh dang thu vien lien ket dpng (Dynamic Link Library/DLL), Cac file DLL sau se duac gpi moi tnrang LabVIEW Hinh la giao dien nguoi sir dung duac xay dung bang phan mem LabVIEW cho phuong phap P&O va cho phuong phap dua tren logic ma Giao dien bao gom cac phan tit luong ao (Virtual InstrumentsWI) dung de hien thi dien ap cua bang pin mat trai, dong dien cua bang pin mat trai va cong suat ciia bang pin mat troi, Ben canh do, giao dien hien ihi cac thong so sau: Mach dpng luc: Mach nang ap tir mot chieu sang mpt chieu (Boost DC/DC Converter) co cac thong so nhir sau: - Cupn cam L = 50mH - T u d i e n C = lmF - Khoa chuyen mach FET - Diot chuyen mach D 3- Bang pin mat troi Model SL120CE-24M [9] 4- Mot laptop cai phan LabVIEW dung de luong va dieu khien 5- Tai la 5c quy 24V dupe noi vai dau ciia mach nang ap dD; bien thien khoang dan cua khoa FET mpt chu ky dong cat Dk_l: thoi gian dan mot chu ky dong cat k-\ cua van FET tai thai diem lay mau thii Mach dieu khien qua trinh dong cat cua khoa FET sii dung vi dieu khien Microchip dsPlC33fjl2mc202 vai dau vao la tin hieu tucmg tir thay doi tir den 3,3V va dau la tin hieu diSu biSn dp rpng xung (Pulse Width Modulation/PWM) tan so 50kHz Dk: thai gian dan mpt chu ky dong cat ciia van FET tai thai diem lay mSu thii k Tin hieu dieu khien (control signal) dua den dau vao analog cua vi dieu khien dsPIC Do thi bien thien theo thai gian ciia cong su^t Edn nhat bang pin mat troi Cac gia tri dien ap, dong dien va cong suat dupe liru lai o dang file "txt" de dupe ve lai su dung phan mem Matiab Hinh,7 la thay doi ciia cong suat Ion nhat cua bang pin mat troi iheo thai gian .^"-j*.! \Hinh Giao dien nguai sir dung xay dung I p h k mSm LabVIEW cho MPPT Hinh He thong thuc nghiem nap ac quy sii dung nSng luong mat troi vai MPPT 20 '"""I'l (a) Phuang phap P&O 25 Tim8[s) (b) phuong phap dua tren logic mo Hinh Thay doi cong suat lan nhat ciia bang pm mat trai theo thoi gian Tap chi Khoa h^c v^ Cong nghf 102 (2014) 006-011 10 15 20 25 •nmels) 30 35 40 15 £0 (b) Phuang phap dua tren logic met Hinh Thay doi ciia dien ap cila bang pin mat trai theo th6i gian Fki££y l o ^ method (a) Phuang phap P&O (b) Phuong phap dua tren logic mo Hinh Thay doi cua dong dien ciia bang pin mlit trai theo thoi gian Theo hinh ta thay chat lupng dong ciia h^: thoi gian qua d6 va dp qua dieu chinh cua phuang phap logic m a nho hen phuang phap P&O Cu the de dat duac cong suat lan nhat phuang phap P&O mat gan 10 giay phuong phap dua tren logic ma chi mat giay de dat duac cong suat lan nhat Chat lupng tTnh ciia he: phuang phap dua tren logic ma CO sai so xac lap nho hon phuong phap P&O nhiet dp tren be mat ciia bang pin mat triri Phan mem LabVIEW duac sir dyng de luong va dieu khien cac thong so cua he thong Phuong phap dua tren logic mo CO nhieu uu diem so voi phuong phap P&O Dieu cho thay sir dung phuong phap logic mo sg dupe ling dung nhieu hon cho he nang lupng mat troi, nhat la voi cac he cong suat Ion Day se la cac budc nghien cim tiep theo cua nhom tac gia Tai lieu tham khao Hinh va hinh lan lucrt la thay 361 cua dien ap va dong dien dau ciia bang pin mat trai img vai cong suat Ian nhat theo thoi gian, Phuong phap dua tren logic m a co tan so va bien dp ciia dien ap va f Ket luan Bai bao da tong hop cac buoc thuc thi ciia hai phuang phap diing de van hanh he thSng nap ic quy su dung nang lupng mat troi img vai di6m lam viSc cong suat cue dai diiu kien moi truong thay d6i: Phuong phap P&O va phuong phap dua tren logic ma, Cac phirang_ phap khong doi hoi phai sii dung cac cam bien moi truong dk dp birc xa va [1] S Bai and B, C, Babu, "Comparative study between P&O and Current Compensation method for MPPT of PV energy system," Conference on Engineering and Systems (SCES) 2012 Students, (2012) I - 6, [2] R, Ramaprabha, B L, Mathur, and M Sharanya, "Solar array modeling and simulation of MPPT using neural network," 2009 International Conference on Control, Automation, Communication and Energy Conservation, (2009) 1-5 [3] S Prenmideepreechacham and N Patanapirom, "Solararray modelling and maximum power point tracking using neural networks," Power Tech Conference Proceedings 2003 IEEE Bologna, vol 2,2003 Tap chi Khoa hQC v^ Cong ngbe 102 (2014) 006-011 [4] B K Bose, "Intelligent control and estimation in power electronics and drives," IEEE International Conference of Electric Machines and Drives, 1997 [5] F H Martinez S., "Fuzzy logic conUoller for boost converter with active power factor conection," 7th Internanonal Conference on Power Electronics, (2007) 936-940 [6] M G Simoes, "Fuzzy Logic Based Intelligent Control of a Variable Speed Cage Machine Wind Generation System," IEEE Transactions on Power Electronics, vol 12,(1997)87-95 [7] T Gupta, "Implementation of a Fuzzy Controller for DC-DC Converters Using an Inexpensive 8-b Microcontroller," IEEE Transactions on Industrial Electronics, vol, 44, (1997) 661 - 669 [8] http,//sine.ni,com/mps/cds/view/p/lang/en/nid/20l987 [9] http-//nbkxsolar.en made-inch i n a, CO m/p roductA'bunvhlYbtiF/China-Mono-SolarPaneM 20W-SL120CE-24M-,htnil [10] http://wv/w, smorgasbordet.com/pel I esc/ ... tit luong ao (Virtual InstrumentsWI) dung de hien thi dien ap cua bang pin mat trai, dong dien cua bang pin mat trai va cong suat ciia bang pin mat troi, Ben canh do, giao dien hien ihi cac thong... thai diem lay mSu thii k Tin hieu dieu khien (control signal) dua den dau vao analog cua vi dieu khien dsPIC Do thi bien thien theo thai gian ciia cong su^t Edn nhat bang pin mat troi Cac gia... chuyen mach D 3- Bang pin mat troi Model SL120CE-24M [9] 4- Mot laptop cai phan LabVIEW dung de luong va dieu khien 5- Tai la 5c quy 24V dupe noi vai dau ciia mach nang ap dD; bien thien khoang dan
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