Uhlelo Lokuvusa Injini Kagesi
Uhlelo lokuvusa ijeneretha kagesi luyisekethe kanye nendlela esetshenziswa ukuhlinzeka ngogesi oqondile (DC) kuma-field windings ku-rotor yejeneretha ehambisanayo. Logesi wokuvusa ijeneretha ukhiqiza insimu yamagnetic edingekayo ukuze ijeneretha ikhiqize i-voltage ku-stator. Ngaphandle kokuvusa okwanele, ijeneretha ngeke ikwazi ukwakha i-voltage yokugcina edingwa uhlelo lwamandla. Ngakho-ke, uhlelo lokuvusa ijeneretha ludlala indima ebalulekile ekuzinzeni kwe-voltage, ukulawulwa kwamandla okusabela, kanye nokusebenza okuphephile kwejeneretha kanye negridi.
Imisebenzi Eyinhloko Yohlelo Lokuvusa Imizwa
Umsebenzi oyisisekelo kakhulu wesistimu yokuvuselela amandla ukuhlinzeka ngogesi wasemajukujukwini ukudala i-magnetic flux ku-rotor. Kodwa-ke, ekusebenzeni kwesistimu yamandla yanamuhla, indima yayo ibanzi kakhulu. Uhlelo lokuvuselela amandla lusebenza ngokubambisana ne-Automatic Voltage Regulator (AVR) ukugcina i-voltage ye-terminal generator ezinzile naphezu kwemithwalo ehlukahlukene. Lapho umthwalo ukhuphuka, i-voltage ivame ukwehla; i-AVR iphendula ngokukhulisa i-excitation current ukuze ibuyisele i-voltage endaweni ebekiwe.
Ngaphezu kwalokho, uhlelo lokuvusa lunquma ikhono lomkhiqizi lokuhlinzeka noma lokumunca amandla okusabela. Ngokwandisa ukuvusa (ukuvusa ngokweqile), ijenereyitha ivame ukuhlinzeka ngamandla okusabela (i-VAR), ngaleyo ndlela isize ekuphakamiseni i-voltage yesistimu. Ngokuphambene nalokho, ngokunciphisa ukuvusa (ukuvusa okungaphansi), ijenereyitha ingamunca i-VAR futhi yehlise i-voltage. Leli khono libalulekile ekulawuleni iphrofayili ye-voltage kumanethiwekhi okudlulisa nokusabalalisa.
Uhlelo lokuvusa ludlala indima ekuzinzeni kwesikhashana. Uma kwenzeka ukuphazamiseka okufana ne-short circuit, ukuvusa okwanda ngokushesha (ukuphoqelela insimu) kungasiza ijeneretha ukuthi igcine ukuvumelanisa. Ngakho-ke, impendulo enamandla yokuvusa iyisici esibalulekile sokuklama ijeneretha.
Izimiso Eziyisisekelo Zokusebenza
Ijenereyitha ehambisanayo ikhiqiza i-voltage ye-AC ku-stator ngenxa yezinguquko ekugelezeni kwe-magnetic ye-rotor ejikelezayo. I-rotor inikezwa i-DC current ngokusebenzisa uhlelo lokuvusa. I-voltage yokuphuma kwejenereyitha ihlobene ne-magnetic flux—enqunywa yi-field current. I-AVR ilinganisa i-terminal voltage nge-voltage transformer (PT/VT), iyiqhathanisa nereferensi, bese ilungisa i-amplifier ye-exciter ukuze ikhuphule noma yehlise i-field current.
Ngaphansi kwezimo ezijwayelekile, i-AVR igcina i-voltage ngaphakathi kwemingcele efiselekayo. Ngaphansi kwezimo eziguquguqukayo, njengokushintsha komthwalo okungazelelwe noma ukuphazamiseka kwesistimu, i-AVR kanye ne-exciter kumele zikwazi ukuphendula ngokushesha kodwa zihlale zizinzile ukuvimbela ukuminyana kwe-voltage.
Izingxenye Eziyinhloko
Ngokuvamile, uhlelo lokuvusa luqukethe:
1. Umthombo wamandla okuvuselela: ungavela kujeneretha encane (i-exciter), kusuka kumatheminali ejeneretha nge-rectifier, noma kusuka emthonjeni ozimele njengebhethri/i-UPS yezidingo zokulawula.
2. I-Automatic Voltage Regulator (AVR): ubuchopho bomlawuli obulawula ukuvusa ngokusekelwe ku-voltage kanye/noma impendulo yamanje.
3. I-Rectifier: iguqula amandla e-AC abe yi-DC ye-rotor, ikakhulukazi ezinhlelweni ezingenamabhulashi noma ezimile.
4. Uhlelo lokusabalalisa lwamanje lwensimu: ngesimo sezindandatho zokushelela namabhulashi ezinhlelweni ezithile, noma ukujikeleza ngaphandle kwamabhulashi ezinhlelweni ezingenamabhulashi.
5. Ukuvikelwa kanye nemikhawulo: Umkhawulo Wokuvusa Okungaphezu Kokuvusa (OEL), Umkhawulo Wokuvusa Okungaphansi Kokuvusa (UEL), Umkhawulo We-Volts/Hz, kanye nokulahlekelwa ukuvikelwa kokuvusa kanye nokuvikelwa kokushisa kwe-rotor.
6. Imishini yokuqapha: ukukalwa kwamandla kagesi, i-voltage yasensimini, izinga lokushisa, kanye nesimo sokushintsha.
Ukuthembeka kohlelo lokuvusa kubalulekile ekuphepheni kwejeneretha. Ukwehluleka kwezingxenye ezifana ne-rectifier noma i-AVR kungabangela ukungazinzi kwamandla kagesi, ukulahlekelwa ukuvusa, kanye nomonakalo we-rotor ngenxa yokushisa ngokweqile.
Izinhlobo Zezinhlelo Zokuvusa Imizwa
1. Uhlelo Lokuvusa I-DC (I-Exciter Ejwayelekile/Ejikelezayo ye-DC)
Lolu hlelo lusebenzisa ijeneretha encane ye-DC (i-exciter) enomgodi ofana nojeneretha oyinhloko. Ukukhishwa kwe-DC kwe-exciter kuqondiswa ku-rotor ngamasongo okushelela namabhulashi. Izinzuzo zalo zifaka phakathi ukwakheka kwalo okulula nokuqondakala kalula, kodwa kudinga ukulungiswa njalo emabhulashini, amasongo okushelela, kanye ne-commutator. Lolu hlelo manje alusasetshenziswa kakhulu ezitshalweni zamandla zesimanje ngenxa yokusabela kwalo okulinganiselwe okuguquguqukayo kanye nezidingo eziphezulu zokulungisa.
2. Uhlelo Lokuvusa I-AC Olungenamabhulashi
Ohlelweni olungenamabhulashi, i-AC exciter (i-AC generator encane) ikhiqiza i-AC current ezingxenyeni ezijikelezayo, bese ilungiswa ngama-rectifier ajikelezayo ukuze inikeze i-generator rotor eyinhloko. Ngenxa yokuthi ayisebenzisi amabhulashi nama-slip rings ku-main field current, idinga ukulungiswa okuncane futhi ithembeke kakhulu ekusebenzeni kwesikhathi eside.
Izinzuzo zezinhlelo ezingenamabhulashi zifaka phakathi ukulungiswa okuncane kwemishini kanye nokuthembeka okuphezulu. Kodwa-ke, impendulo yazo enamandla ngokuvamile ihamba kancane kunezinhlelo ezimile, futhi ukuxilongwa kwamaphutha kuma-diode ajikelezayo kungaba nzima kakhulu ngoba ayingxenye yengxenye ejikelezayo.
3. Uhlelo Lokuvusa Okungaguquki
Izinhlelo ezimile zisebenzisa ama-rectifier e-thyristor noma e-IGBT adonsa amandla kuma-terminal e-generator (nge-transformer yokuvuselela) bese enikeza i-DC ku-rotor ngama-slip rings. Ngenxa yokuthi ukulawula kwenziwa kusetshenziswa ama-electronics anamandla asheshayo, lezi zinhlelo zinempendulo enhle kakhulu enamandla. Lokhu kuzenza zilungele izitshalo ezinkulu zamandla ezidinga amakhono okuqinisa insimu ngesikhathi sokuphazamiseka.
Okubi ukuthi isadinga izindandatho zokushelela namabhulashi, futhi idinga uhlelo oluhle lokupholisa nokuvikela ama-electronics kagesi. Kodwa-ke, maqondana nokusebenza kokulawula i-voltage kanye nokuzinza, ukuvusa okungaguquki kuvame ukuba yisinqumo esikhethwayo ezitshalweni eziningi zamandla zanamuhla.
I-AVR, i-Stabilizer, kanye nokulawula okuthuthukisiwe
Ama-AVR anamuhla avame ukuhlonyiswa nge-Power System Stabilizer (PSS) ukuze afake i-damping kuma-frequency aphansi ohlelweni lwamandla. I-PSS inikeza isignali eyengeziwe ku-AVR ngokusekelwe ekushintsheni kwejubane le-rotor noma amandla, ngaleyo ndlela isize ekunciphiseni ukujiya kwe-rotor angular ngemva kokuphazamiseka. Inhlanganisela ehlelwe kahle ye-AVR esheshayo ne-PSS ingandisa kakhulu i-margin yokuzinza kwesistimu.
Ngaphandle kwe-PSS, kunezinye izindlela zokulawula ezifana nokulawula amandla noma ukulawula amandla okusabela (ukulawula i-VAR). Kulezi zindlela, i-AVR ayigcini nje ngokuqondisa i-voltage ye-terminal kodwa futhi ilawula ukuvusa ukuze igcine i-power factor ethile yejeneretha, ihlangabezane nezidingo zokusebenza kwenethiwekhi.
Ukuvikelwa Kokusebenza kanye Nemikhawulo
Ukuze kusebenze kahle ijenereyitha, ukuvusa kunqunyelwe yimingcele eminingana. I-OEL ivimbela ukugeleza kwensimu okuphezulu kakhulu, okungafudumeza i-rotor futhi kunciphise impilo yokuvikela. I-UEL ivimbela ukuvusa okuphansi kakhulu, okungaholela ekungazinzini noma ekulahlekelweni kwezimo zokuvusa, lapho ijenereyitha ingaziphatha njengenjini yokungenisa futhi imunce ama-VAR amakhulu ohlelweni. Umkhawulo we-Volts/Hz uvikela umongo wensimbi ekugcwalisweni ngenxa yama-voltage aphezulu kakhulu kuma-frequency aphansi, isimo esingase senzeke ngesikhathi sokuqala noma ngesikhathi sokuphazamiseka kwemvamisa.
Ukuvikelwa kokulahlekelwa ukuvusa kuvame ukuqapha izici zamandla okusabela noma okusabela ukuze kutholakale izimo zensimu ezibuthakathaka ngokungavamile. Uma kutholwa, uhlelo lungakhipha i-alamu, lunciphise umthwalo, noma lukhubeke ukuze kuvinjelwe umonakalo.
Izinselele Zokunakekela Nokusebenza
Ukugcinwa kwesistimu yokuvuselela kuncike ohlotsheni. Izinhlelo ezibhulashiwe zidinga ukuhlolwa njalo kokuguga kwebhulashi, ukuhlanzeka kwendandatho yokushelela, kanye nothuli lwekhabhoni. Ezinhlelweni ezingenamabhulashi, ukunakwa kugxilwe esimweni sama-diode ajikelezayo, ukuxhumana, kanye nesistimu yokupholisa. Ezinhlelweni ezimile, ukugcinwa kugxila kumamojula e-thyristor/IGBT, amasekethe okulawula, kanye nekhwalithi yomoya opholile kanye nokuhlunga umoya.
Enye inselele ukulungisa i-AVR kanye ne-PSS. Ukuyibeka ngamandla kakhulu kungabangela ukuzingela noma ukunyakaza kwamandla kagesi, kuyilapho ukuyibeka kancane kakhulu kungenza ijeneretha ingakwazi ukumelana nokuphazamiseka. Ngakho-ke, ukuqalisa kanye nokuhlola okunamandla (isb., ukuhlolwa kwempendulo yesinyathelo) kubalulekile ekusebenziseni uhlelo lokuvusa.
I-Penutup
Uhlelo lokuvusa igesi kagesi luyinto ebalulekile ekusebenzeni kwejeneretha ehambisanayo kanye nohlelo lwamandla lulonke. Ngokuhlinzeka ngogesi wamandla olawulwayo, lugcina i-voltage, lulawula amandla asabelayo, luthuthukisa ukuzinza, futhi luvikela ijeneretha ezimweni zokusebenza eziyingozi. Izinhlobo ezahlukene zokuvusa igesi—i-DC evamile, engenamabhulashi, kanye ne-static—zinikeza izinketho zokuhlangabezana nokuthembeka, izindleko zokulungisa, kanye nezidingo zokusebenza eziguquguqukayo. Kumagridi kagesi ayinkimbinkimbi afuna ikhwalithi yamandla ephezulu, uhlelo lokuvusa oluklanywe kahle, olulawulwa kahle, nolugcinwe kahle luyisihluthulelo sokusebenza okuphephile, okusebenzayo, nokuzinzile kwejeneretha.
