ࡱ> fhekFq`dbjbjqPqP c|::'zzzzzzz$""""LnD)Buuu((((((($*h>-(]zuuuuu(zzN)(((uzz((u(((zz( P "$L((d)0)(-'-(-z( uu(uuuuu((( uuu)uuuu""zzzzzz AUTONOMNI PWM-IZMJENJIVA  ZA SUN ANE FOTONAPONSKE ELEKTRANE Viktor `unde Tehni ki fakultet Sveu iliata u Rijeci, Vukovarska 58, 51000 Rijeka }eljko Jakopovi, Zvonko Ben i Fakultet Elektrotehnike i ra unarstva Sveu iliata u Zagrebu, Unska 3, 10000 Zagreb Sa~etak: Izvraena je usporedba izmjenjiva a sa strujnim ulazom i izmjenjiva a s naponskim ulazom glede faktora snage. Pokazano je da se s izmjenjiva em sa strujnim ulazom na na elu modulacije airine strujnih impulsa ne mo~e postii jedini ni faktor snage na mjestu priklju ka na izmjeni nu mre~u. Naprotiv, s izmjenjiva em s naponskim ulazom lako se posti~e jedini ni faktor snage. Zato se taj izmjenjiva  uvelike primjenjuje u sun anim elektranama s fotonaponskim modulima. Za njega je izveden matemati ki uvjet upravljanja po jedini nom faktoru snage i dana je na elna shema regulacijskog kruga. Klju ne rije i: sun ane elektrane, u inska elektronika, autonomni pretvara i UVOD Funkcija PWM-izmjenjiva a je da omogui prije-nos elektri ne energije iz fotonaponskih modula u razdjelnu mre~u uz ato je mogue vei faktor snage. Budui da je napon fotonaponskih modula nevaloviti istosmjerni, a napon razdjelne mre~e sinusni izmjeni ni, izmeu fotonaponskih modula i izmjeni ne mre~e mora se nalaziti pretvara ki sklop za pretvorbu istosmjernog napon u izmje-ni ni. Taj pretvara ki sklop nu~no mora sadr~avati odvojnu priguanicu, jer trenuta na snaga fotona-ponskih modula nije jednaka trenuta noj snazi koju prima razdjelna mre~a. 1. NA ELNA TOPOLOGIJA IZMJENJIVA A Ograni it emo se samo na prijenos elektri ne energije iz fotonaponskih modula u jednofaznu mre~u. Kasnije se razmatranje lako proairi i na trofaznu mre~u. Optimalni spoj za spajanje istosmjerne mre~e fotonaponskih modula s jednofaznom izmjeni nom mre~om je mosni spoj. Kao ato je tetraedar najsavraenije geometrijsko tijelo omeeno s etiri ravne plohe, tako je i jednofazni mosni spoj najsavraeniji od svih mosnih spojeva, slika 1. Iz simetrije tetraedra je o ito da su sve etiri sklopke u jednakim strujno-naponskim uvjetima. Odvojna priguanica mo~e se nalaziti ili u seriji s istosmjer-nim mre~om ili u seriji s izmjeni nom mre~om. U prvom slu aju radi se o izmjenjiva u sa strujnim ulazom, a u drugom o izmjenjiva u s naponskim ulazom, slika 2.  Sl. 1.: Izmjeni na mre~a i troailo nalaze se u mi-moilaznim bridovima tetraedra. U preostala etiri brida nalaze se elektri ke sklopke. Osnovni kriterij odabira topoloakog polo~aja od-vojne priguanice je faktor snage s kojim izmjeni na mre~a prima energiju iz fotonaponskih modula. Faktor snage  jednak je [1]:  EMBED Equation.3  (1) gdje je: I1/I faktor izobli enja struje I1 efektivna vrijednost osnovnog harmonika struje I efektivna vrijednost ukupne struje cos (1 faktor faznog pomaka osnovnog harmo-nika struje prema sinusnom naponu mre~e  Sl. 2.: Mogua dva topoloaka polo~aja odvojne priguanice. 2. IZMJENJIVA  SA STRUJNIM ULAZOM Uzet emo da P- i N-sklopke sklapaju redoslijedom prema slici 3 [1, 2]. Joa emo uzeti da je odvojna priguanica tako velikog induktiviteta da je istosmjerna struja id bezna ajne valovitosti. Tada je struja izmjeni ne mre~e is kvazipravokutnog valnog oblika; tj. pored razina +1 i (1 postoji i razina 0. Fazni pomak (1 osnovnog harmonika struje prema sinusnom naponu mo~e se po volji podeaavati. Odreuje ga impulsni ureaj sinkroniziran na napon mre~e. Amplituda osnovnog harmonika stru-je mo~e se takoer po volji podeaavati trajanjem 2( razine nula.  Sl. 3.: Napon i struja mre~e izmjenjiva a sa struj-nim ulazom u mosnom spoju.  Sl. 4.: Mre~om komutirani tiristorski izmjenjiva  u mosnom spoju. Odabirom (1 = 0, osnovni harmonik struje je u fazi s naponom. Faktor faznog pomaka je pozitivan:  EMBED Equation.3 . Pozitivni cos (1 zna i da izmjeni na mre~a prima energiju. Faktor izobli enja struje mre~e za bilo koji ( je manji od 0,96. Izobli enje struje mre~e ne mo~e se smanjiti, primjerice, metodom modulacije airine impulsa. Naime, poznato je da modulacija airine impulsa premjeata harmonike u blizinu sklopne frekvencije, a da pritom ne smanjuje faktor izobli enja. Zato se izmjenjiva i sa strujnim ulazom ne primjenjuju za prijenos elektri ne energije iz istosmjernog izvora u izmjeni nu mre~u. Posebna vrsta izmjenjiva a sa strujnim ulazom je mre~om komutirani tiristorski izmjenjiva , slika 4. Ako je odvojna priguanica dovoljno velika, struja izmjeni ne mre~e je pravokutnog valnog oblika. Fazni pomak osnovnog harmoni kog lana (1 je uvijek vei od 0 (zbog potrebnog vremena odma-ranja tiristora), a faktor izobli enja struje je 0,9. Zato je faktor snage manji nego u slu aju kvazi-pravokutne struje:  EMBED Equation.3  (2) Kut  je kut upravljanja. 3. IZMJENJIVA  S NAPONSKIM ULAZOM Uzet emo da P- i N-sklopke sklapaju redoslijedom prema slici 5 [1, 2]. Tada je izlazni napon izmjenjiva kog sklopa vi kvazipravokutnog valnog oblika. Kao i u slu aju izmjenjiva a sa strujnim ulazom imamo dvije upravlja ke varijable: Q i (. Varijabla Q odreuje fazni pomak osnovnog har-monika izlaznog napona izmjenjiva a prema sinus-nom naponu, a vaz~    &*TXdf<8:^`ٽ򏛆wijIKh*K#CJEHUaJjK h*K#CJUVaJh*K#6CJaJjh*K#CJUaJh*K#CJaJh*K#5CJaJh*K#CJaJh*K#6CJaJh*K#5CJaJh*K#6CJ]aJh*K#CJaJh*K#5CJaJh*K#56CJaJ h*K#5h*K#h*K#5CJaJ%<z|~ `   TVXZdf:<$a$$xa$$a$$@&a$dZ\P@DFT#$ ^`a$$ ^`a$ $ ^a$$da$$a$$a$PR>@BL N P R 4!6!z!|!!6#8#:#X#Z###$$$J%L%r%пл{jh*K#Ujh*K#Ujh*K#U h*K#6 jdh*K#6 jjh*K#6 j-h*K# h*K#H* h*K#6]h*K# h*K#5jMh*K#CJUaJh*K#5CJaJ jjh*K#6CJaJh*K#6CJaJh*K#CJaJh*K#CJH*aJ.T#V#X#\#^###$$$$t&v&P)R),,,,,,,@-B-<>>>B>$a$`$a$dr%t%v%x%%%%L&N&,+.+0+,,,,,,,,,@-B-*.,...0./// /"/8/:/>>֮֝֘֝ɝ|w|ecU"h*K#OJQJaJmH nH sH tH  h*K#](h*K#6OJQJ]aJmH nH sH tH  h*K#CJ\ h*K#5 h*K#6]j h*K#EHU%j7K h*K#UVmH nH sH tH  jdh*K#6 h*K#H* jjh*K#6h*K#jh*K#Uj h*K#EHU%j4:K h*K#UVmH nH sH tH &rijabla ( njegovu amplitudu.  Sl. 5.: Napon i struja mre~e izmjenjiva a s napon-skim ulazom u mosnom spoju. Fotonaponski moduli i izmjenjiva ki sklop mogu se nadomjestiti naponskim izvorom kvazipravokutnog valnog oblika. Ako se pretpostavi da je induktivitet odvojne priguanice velik, viai harmonici struje (3, 5, 7, ...) se mogu zanemariti, pa treba ra unati samo s osnovnim harmonikom kvazipravokutnog napo-na. Tako se dolazi do nadomjesne sheme prikazane na slici 6.  Sl. 6.: Nadomjesna shema izmjenjiva a s napon-skim ulazom za ra unanje struje kroz odvojnu pri-guanicu.  Sl. 7.: Fazorski dijagram naponsko-strujnih odnosa izmjenjiva a s naponskim ulazom u mosnom spoju. Sada se naponsko-strujni odnosi u nadomjesnoj shemi mogu prikazati fazorima, slika 7. Uprav-lja kom varijablom Q namjeata se fazni kut struje is prema naponu vs, a varijablom ( njezina amplituda. Fazni kut struje is prema naponu vs mora biti takav da izmjeni na mre~a prima energiju iz fotona-ponskih modula. Najpovoljnije je odabrati takav par vrijednosti Q i ( da je struja is u fazi s naponom vs. Odr~avanjem faznosti struje i napona izmjeni ne mre~e, uz pretpostavku da su harmonici struje mre~e zanemarivi, dobije se faktor snage  = 1. `toviae, struja mre~e mo~e biti kapacitivna (na tom na elu zasnivaju se tzv. stati ki kompenzatori jalove snage). 4. U INSKI KRUG PWM-IZMJENJIVA A Analizom naponsko-strujnog naprezanja elektri kih sklopki i njihovih sklopnih karakteristika kod izmjenjiva a s naponskim ulazom dolazi se do zak-lju ka da sklopke moraju biti strujno dvosmjerne, naponski unipolarne te da mogu uklapati i isklapati struju. Ostvaruju se antiparalelnim spojem diode i nekog od tranzistora (npr. bipolarni tranzistor ili tranzistor s izoliranom upravlja kom elektrodom, IGBT). Danas se naj eae koristi IGBT-sklopka, slika 8. Upotrebom IGBT-sklopki izlazni napon izmjenji-va a se mo~e modulirati metodom airine impulsa. I dalje vrijedi nadomjesna shema na slici 6., s time da je odvojna priguanica manjeg induktiviteta jer su harmonici premjeateni u podru je sklopne frek-vencije.  Sl. 8.: IGBT-usmjeriva . Mo~e raditi ili u isprav-lja kom ili u izmjenjiva kom na inu rada.  Sl. 9.: Nadomjesna shema izmjenjiva a s napon-skim ulazom za ra unanje struje kroz odvojnu pri-guanicu u slu aju nezanemarivog otpora izmjeni ne mre~e. Nadomjesna shema na slici 6. mo~e se upotpuniti uvoenjem otpora Rs izmjeni ne mre~e, slika 9. U tom slu aju izlazni napon izmjenjiva a treba biti:  EMBED Equation.3  (3) Uvratenjem sinusnog napona mre~e:  EMBED Equation.3  i sinusnu struju mre~e fazno pomaknutu za kut 1:  EMBED Equation.3  u (3) dobije se:  EMBED Equation.3  (4) gdje je:  EMBED Equation.3 . Ova jednad~ba za  EMBED Equation.3  poprima oblik:  EMBED Equation.3  (5) Pripadajui fazorski dijagram prikazuje slika 10.  Sl. 10.: Fazorski dijagram naponsko-strujnih od-nosa izmjenjiva a s naponskim ulazom u mosnom spoju pri jedini nom faktoru snage. LITERATURA (1( J. G. Kassakian, M. F. Schlecht, G. C. Verghe-se, Osnove energetske elektronike, I. dio, Graphis, Zagreb, 2000, ISBN: 953-6647-25-7 (2( N. Mohan, T. Undeland, W. Robins, Power Electronics: Converters, Applications and Design, Wiley Text Books, Third Edition, 2002, ISBN: 0471226939 (3( M. Crappe, L. Gertmar, A. Habck, W. Leon- hard, D. Povh, Power Electronics and Control 5. REGULACIJSKI KRUG PWM-IZMJENJIVA A Regulacijski krug u na elu se sastoji od regulatora napona i regulatora struje, slika 11.  Sl. 11.: Blokovska shema regulacijskog kruga auto-nomnog PWM-izmjenjiva a za odr~avanje jedini -nog faktora. Regulator napona odreuje amplitudu struje is koju izmjenjiva  aalje u mre~u. Referentnim signalom regulatora napona  EMBED Equation.3  namjeata se optimalna radna to ka fotonaponskog modula. Izlazni napon regulatora napona mno~i se sa sinusnim signalom koji je u fazi s naponom izmjeni ne mre~e. Tako se dobije referentni signal struje  EMBED Equation.3 . Regulator struje je npr. histerezni regulator. ZAKLJU AK Osnovni kriterij odabira izmjenjiva a za prijenos elektri ne energije iz fotonaponskih modula u izmjeni nu razdjelnu mre~u je faktor snage na mjestu priklju ka izmjenjiva a na tu izmjeni nu mre~u. Pokazano je da se s izmjenjiva em s na-ponskim ulazom na na elu modulacije airine naponskih impulsa mo~e postii jedini ni faktor snage. Zato je izmjenjiva  s naponskim ulazom premoan izmjenjiva u sa strujnim ulazom. by Microelectronics in Future Energy Systems, EPE Journal, Vol. 10, No. 1, April 2000, str. 6-10, 40-46 (4( J. Rodriguez, J. Dixon, J. Espinoza, P. 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