Ulwazi oluyisisekelo lwabasebenzisi
Inkampani yemikhiqizo yepulasitiki ikhiqiza ikakhulukazi amapayipi okuhambisa amanzi e-PE, amapayipi okudonsa amanzi ensimbi, njll. Le nkampani inemigqa yokukhiqiza emi-4, ingxenye yamandla okushayela isebenzisa ama-DC brushless motors kanye nama-DC variable frequency drive motors, kukhona amasethi amane we-400KVA, i-transformer ngayinye. Uhlangothi oluphansi lwengcindezi Ifakwe ibhokisi lesinxephezelo se-capacitance.Umdwebo wesistimu yokunikezwa kwamandla umi kanje:
Idatha yangempela yokusebenza
Injini ye-DC ye-transformer engu-400KVA, amandla aphezulu e-inverter angu-360KW, isici samandla esimaphakathi ngu-PF=0.7, ukusebenza kwamanje ngu-780A, ibhokisi lesinxephezelo elingalungile ngaphansi kwe-transformer ngayinye livame ukuhamba, i-capacitor iyakhula futhi ivuze, futhi isilawuli asikwazi ukulawula okungavamile, njll. I-Phenomena, izinga eliphelele lingu-0.8 kuphela, futhi inhlawulo engavumelekile icishe ibe ngu-15,000 ngenyanga.Ngaphezu kwalokho, ama-motor kanye neziqalisi ezithambile emgqeni wokukhiqiza ngezinye izikhathi zonakaliswa, okuthinta ukukhiqizwa.
Ukuhlaziywa Kwesimo Sesistimu Yamandla
Umthwalo oyinhloko wemoto ye-DC brushless motor kanye ne-inverter rectifier amandla kagesi angu-6 okulungisa ishayela elilodwa.Ngesikhathi sokusebenza kwemishini yokulungisa, i-AC ingaguqulelwa ku-DC, yakhe inombolo enkulu yemithombo yamanje ye-pulse, yethula ama-harmonic currents kugridi yamandla, futhi ithinte igridi yamandla.I-impedance yesici idala i-voltage esebenzayo ye-pulse current, okuholela ekuphumeni kohlaka lwe-voltage esebenzayo kanye neyamanje, kubeka engcupheni ikhwalithi nokusebenza kokuphepha kokuphakelwa kukagesi okushintshayo, okwandisa ukulahleka kolayini nokuphambuka kwamandla kagesi, nokuba umthelela omubi kugridi yamandla kanye nempahla kagesi yesikhungo samandla ngokwaso.
Isixhumi esibonakalayo sekhompiyutha yesilawuli sohlelo (i-PLC) siyazwela ekuhlanekeni kwe-harmonic kagesi osebenzayo wokushintshwa kwamandla kagesi.Ngokuvamile kubalulwe ukuthi ingqikithi yokulahleka kozimele we-voltage esebenzayo yamanje (THD) ingaphansi kuka-5%, kanye ne-voltage esebenzayo yamanje ye-pulse Uma izinga lohlaka liphezulu kakhulu, iphutha lokusebenza kohlelo lokulawula lingaholela ekuphazamisekeni ukukhiqiza noma ukusebenza, okuholela engozini enkulu yesibopho sokukhiqiza.
Lapho ibhange le-capacitor yesinxephezelo samandla asebenzayo liqala ukusebenza, ngenxa yokuthi isici samanje se-pulse i-impedance yebhange le-capacitor lincane, inani elikhulu le-pulse current lingeniswa ekubunjweni kwe-capacitor, futhi inani lamanje landa ngokushesha, lithinta kakhulu impilo yalo yesevisi. .Ngakolunye uhlangothi, lapho i-pulse capacitor yamanje yebhange le-capacitor ilingana ne-pulse inductor yamanje yesofthiwe yesistimu, ukwanda kwamandla e-harmonic (izikhathi ezingu-2-10) kuzobangela ukuthi i-capacitor ishise futhi iyibhubhise, futhi i-pulse current izobangela ukuthi imvamisa yamandla okukhiphayo ishintshe.I-waveform ye-sinusoidal iphumile ohlakeni, okuholela kugagasi elicijile elimise okwesaha, futhi lizobangela ukukhipha ingxenye yento yongqimba evikelayo, ngaleyo ndlela kusheshise ukumbozwa kwento yongqimba oluvikelayo, futhi kubangele umonakalo ku-capacitor.Ngakho-ke, ikhabhinethi yesinxephezelo samandla asebenzayo e-capacitor ayikwazi ukusetshenziselwa isinxephezelo samandla e-DC brushless motor kanye ne-inverter, futhi isihlungi esinomsebenzi wokucindezela wamanje we-pulse kufanele sikhethelwe isinxephezelo samandla asebenzayo aphansi.
Hlunga uhlelo lokwelashwa kwesinxephezelo samandla asebenzayo
Imigomo yokubusa
Idizayini yempahla yesinxephezelo yesihlungi ihlangabezana nezidingo zokucindezelwa kwe-harmonic kanye nokuphathwa kokucindezelwa kwamandla okusebenzayo.
Ngaphansi kwemodi yokusebenza yesistimu engu-0.4KV, ngemva kokuthi isisetshenziswa sesinxephezelo sesihlungi sesiqalile ukusebenza, ishayela liyacindezelwa, futhi isilinganiso samandla sanyanga zonke sicishe sibe ngu-0.92.
I-high-order harmonic resonance, i-resonance overvoltage, kanye ne-overcurrent okubangelwa ukuxhuma kumjikelezo wegatsha lesinxephezelo sesihlungi ngeke kwenzeke.
Umklamo Ulandela Amazinga
Ikhwalithi yamandla Ama-harmonics egridi yomphakathi GB/T14519-1993
Ikhwalithi yamandla Ukushintshashintsha kwe-Voltage nokucwayiza kwe-GB12326-2000
Izimo zobuchwepheshe ezijwayelekile zedivayisi yesinxephezelo samandla asebenzayo aphansi-voltage GB/T 15576-1995
Idivayisi yesinxephezelo samandla asebenzayo we-low-voltage JB/T 7115-1993
Izimo zobuchwepheshe zesinxephezelo samandla asebenzayo JB/T9663-1999 “Isilawuli sesinxephezelo esizenzakalelayo samandla asebenzayo aphansi-voltage” kusukela enanini eliphezulu lomkhawulo wamanje we-harmonic wamandla aphansi kanye nempahla kagesi GB/T17625.7-1998
Imigomo ye-Electrotechnical Amandla capacitor GB/T 2900.16-1996
I-voltage ephansi ye-shunt capacitor GB/T 3983.1-1989
I-Rector GB10229-88
I-Reactor IEC 289-88
I-oda yesilawuli sesinxephezelo samandla asebenzayo aphansi asebenzayo izimo zobuchwepheshe DL/T597-1996
Ibanga eliphansi le-voltage yokuvikela indawo kagesi engu-GB5013.1-1997
I-low-voltage ephelele yokushintsha kanye nemishini yokulawula GB7251.1-1997
Design imibono
Ngokwesimo esithile senkampani, inkampani yethu idizayine isethi ye-DC enemininingwane yemoto kanye ne-soft starter esebenzayo yesihlungi sesinxephezelo samandla.Cabangela ngokugcwele isici samandla omthwalo nokucindezelwa kwe-harmonic, futhi ufake izihlungi ohlangothini lwe-voltage engezansi engu-0.4KV yesiguquli senkampani ukuze uthole isinxephezelo samandla asebenzayo aphansi ukuze ucindezele ama-harmonics, unxephezele amandla asebenzayo, futhi uthuthukise isici samandla.Ngesikhathi sokusebenza kwe-DC motor kanye ne-inverter, idivayisi yokulungisa kabusha ikhiqiza ama-harmonics aphezulu angu-6K+1.Ngemva kokubola kwamanje futhi kuguqulwe uchungechunge lwe-Fourier, izikhathi ezingu-5 ze-250HZ kanye nezikhathi ezingu-7 zama-harmonics aphezulu ngaphezu kuka-350HZ ziyakhiqizwa.Ngakho-ke, ekwakhiweni kwesinxephezelo samandla asebenzayo wesihlungi somlilo kagesi, kuyadingeka ukuklama amafrikhwensi angama-250HZ, 350HZ nangaphezulu ukuze kuqinisekiswe ukuthi igatsha lesinxephezelo lesihlungi lingacindezela ngempumelelo ama-harmonics ngenkathi kunxeshezelwa amandla asebenzayo kanye nokwenza ngcono isici samandla.
umsebenzi wokuklama
Amandla aphelele we-DC motor kanye ne-frequency converter umugqa wokukhiqiza ohambisana ne-transformer engu-400KVA anxeshezelwa ukusuka ku-0.7 kuya ngaphezulu kuka-0.95.Isinxephezelo sesihlungi sidinga ukumiswa kumthamo we-380kvar, esihlukaniswa ngamaqembu angu-4 womthamo futhi sinqunywe ngokuzenzakalelayo ukuze kunxeshezelwe ukugoba kohlangothi lwe-low-voltage ye-transformer ngokulandelanayo.Umthamo wokulungisa ohlukanisiwe ungu-45kvar, ongavumelanisa nezimfuneko zamandla ahlukahlukene womugqa wokukhiqiza, ngakho umklamo uqinisekisa ngokugcwele ukuthi amandla alungisiwe angaphezulu kuka-0.9.
Ukuhlaziywa komthelela ngemva kokufakwa kwesinxephezelo sesihlungi
NgoJulayi 2010, idivayisi yesinxephezelo samandla asebenzayo esihlungi yamamotho e-DC kanye neziguquli zefrikhwensi yafakwa futhi yaqala ukusebenza.Idivayisi ilandelela ngokuzenzakalelayo izinguquko zomthwalo wamamotho e-DC neziguquli zefrikhwensi, icindezela ama-harmonics e-oda eliphezulu ngesikhathi sangempela, inxephezela amandla asebenzayo, futhi ithuthukisa isici samandla.imininingwane kanjena:
Ngemva kokuthi idivayisi yesinxephezelo sesihlungi isiqalile ukusetshenziswa, ijika lesici samandla ngemva kokusetshenziswa kwesinxephezelo sesihlungi singaba ngu-0.99 (ingxenye ephakanyisiwe icishe ibe ngu-0.7 lapho kukhishwa idivayisi yesinxephezelo sesihlungi)
Layisha ukusebenza
Eyamanje esetshenziswa i-400KVA transformer yehlisiwe isuka ku-770A iye ku-520A, yehle ngo-33%.Ngemva kwesinxephezelo, inani lokunciphisa ukulahlekelwa kwamandla ngu-WT=△Pd*(S1/S2)2*τ*[1-(cosφ1/cosφ2)2]=5×{(0.7×400)400}2×0.4≈2.8( kw· h) Kufomula, i-Pd ukulahleka kwesikhashana kwesiguquli, okungu-5KW, kanti ukonga konyaka wezindleko zikagesi ngu-2.8*20*30*10*0.7=11,700 yuan (ngokusekelwe ekusebenzeni amahora angu-20 a usuku, izinsuku ezingu-30 ngenyanga, izinyanga ezingu-10 ngonyaka, ugesi we-kwh 0.7 yuan).
isimo amandla factor
Isici esiphelele samalungelo enkampani sikhuphuke sisuka ku-0.7 saya ku-0.95, isici samalungelo sanyanga zonke sahlala ku-0.96-0.98, futhi inhlawulo ikhuphuke isuka ku-15,000 yuan ngenyanga yaya ku-3,000-5,000 yuan ngenyanga.
Isihlungi se-BLDC motor nesiqalisi esithambile
Idivayisi yesinxephezelo samandla asebenzayo inamandla okucindezela i-pulse current futhi inxephezele umthwalo wamandla asebenzayo, ixazulule inkinga yenhlawulo yamandla esebenzayo, ikhuphule umthamo ophumayo we-transformer, inciphise ukusetshenziswa kwamandla asebenzayo, futhi ikhulise okukhiphayo, ilethe izinzuzo ezisobala zezomnotho. enkampanini kanye nokubuyiselwa kokutshalwa kwezimali kwephrojekthi yekhasimende ngonyaka odlule.Ngakho-ke, inkampani yaneliseke kakhulu ngesinxephezelo samandla asebenzayo wama-brushless DC motors nezihlungi ze-inverter, futhi izokwethula amakhasimende athile esikhathini esizayo.
Isikhathi sokuthumela: Apr-14-2023