Abahlinzeki bemishini yempendulo yamandla yeziguquli zemvamisa bakukhumbuza ukuthi ezinhlelweni zendabuko zokulawula imvamisa ezakhiwe iziguquli zemvamisa yenhloso ejwayelekile, amamotho asynchronous, nemithwalo yemishini, lapho umthwalo ongaba khona odluliswa yinjini wehliswa, injini ingase ibe sesimweni sokubhuleka kabusha; Noma lapho injini yehla isuka ejubaneni elikhulu iye kwisivinini esiphansi (kuhlanganise nokupaka), imvamisa ingase yehle ngokuzumayo, kodwa ngenxa ye-inertia yomshini wenjini, ingase ibe sesimweni sokukhiqiza amandla kabusha. Amandla emishini agcinwe ohlelweni lokudlulisa aguqulwa abe amandla kagesi yinjini futhi abuyiselwe kusekethe ye-DC ye-inverter ngama-diode ayisithupha ahamba ngamasondo e-inverter. Ngalesi sikhathi, i-inverter isesimweni esilungisiwe. Kuleli qophelo, uma zingekho izinyathelo ezithathwayo ukuze kudle amandla kusiguquli sefrikhwensi, la mandla azobangela ukuba i-voltage ye-capacitor yokugcina amandla kusekethe emaphakathi ikhuphuke. Uma ibhuleki ishesha kakhulu noma umthwalo owenziwe ngomshini uyisixhumi, la mandla angase abangele umonakalo kusiguquli sefrikhwensi, ngakho-ke kufanele sicabangele indlela yokusebenzisa la mandla.
Eziguqulini ezijwayelekile, kunezindlela ezimbili ezivame ukusetshenziswa zokuphatha amandla avuselelwayo: (1) ukuwahlakaza "ku-braking resistor" esethwe ngokuzenzisa ngokuhambisana ne-capacitor kusekethe ye-DC, ebizwa ngokuthi yi-power braking state; (2) Uma ibuyiselwa kugridi yamandla, ibizwa nge-feedback braking state (eyaziwa nangokuthi isimo sokuvuselela ibhuleki). Kukhona enye indlela yokubhuleka, okuyi-DC braking, engasetshenziswa ezimeni lapho kudingeka khona ukupaka okunembile noma lapho i-brake motor ijikeleza ngokungavamile ngenxa yezinto zangaphandle ngaphambi kokuqala.
Ngokuthuthuka kobuchwepheshe bokuguqula imvamisa, ukuklanywa nokusetshenziswa kwe-frequency converter braking, ikakhulukazi indlela entsha yokubhuleka "ye-energy feedback braking", kunezinzuzo "ze-feedback braking" nokusebenza kahle okuphezulu, kanye nezinzuzo "zokubhuleka kokusetshenziswa kwamandla", okungangcoliswanga igridi yamandla nokuthembeka okuphezulu.
Ukubhuleka ukusetshenziswa kwamandla
Indlela yokusebenzisa i-resistor ye-braking ebekwe kumjikelezo we-DC ukuze imunce amandla kagesi okuvuselelayo wemoto ibizwa ngokuthi i-energy ukusetshenziswa braking, enenzuzo yokwakha elula; Akukho ukungcola kugridi yamandla (uma kuqhathaniswa nokulawula impendulo), izindleko eziphansi; Okubi wukusebenza kahle okuphansi, ikakhulukazi ngesikhathi sokubhuleka njalo, okuzodla inani elikhulu lamandla futhi kwandise umthamo we-resistor yokubhuleka.
Ngokuvamile, eziguqulini ezivamile, iziguquli zefrikhwensi yamandla aphansi (ngaphansi kuka-22kW) zifakwe iyunithi yebhuleki eyakhelwe ngaphakathi, edinga kuphela i-resistor yamabhuleki yangaphandle. Iziguquli zamandla aphezulu (ngaphezulu kuka-22kW) zidinga amayunithi amabhuleki angaphandle kanye nezinsimbi zamabhuleki.
Ukubhuleka kwempendulo
Ukuze uzuze ukubhuleka kwempendulo yamandla, izimo ezifana nokulawula i-voltage ngefrikhwensi efanayo nesigaba, ukulawulwa kwamanje kwempendulo, njll. kuyadingeka. Isebenzisa ubuchwepheshe be-inverter obusebenzayo ukuze iguqule amandla kagesi avuselelwe kumandla we-AC wefrikhwensi efanayo nesigaba njengegridi yamandla bese iwabuyisela kugridi, ngaleyo ndlela kuzuzwe ukubhuleka. Inzuzo ye-feedback braking ukuthi impendulo yamandla kagesi ithuthukisa ukusebenza kahle kwesistimu. Ububi bayo ukuthi: (1) le ndlela yokubhuleka impendulo ingasetshenziswa kuphela ngaphansi kukagesi wegridi ozinzile ongajwayele ukuba namaphutha (ukushintshashintsha kwegridi kagesi okungeqile ku-10%). Ngoba ngesikhathi sokusebenza kwe-braking yokukhiqiza amandla, uma isikhathi sephutha le-voltage yegridi yamandla sikhulu kuno-2ms, ukwehluleka kokushintsha kungase kwenzeke futhi izingxenye zingalimala. (2) Phakathi nempendulo, kukhona ukungcoliswa kwe-harmonic kugridi yamandla. (3) Ukulawula kuyinkimbinkimbi futhi izindleko ziphezulu.
Indlela entsha yokubhuleka (i-capacitor impendulo braking)
Ubuchwepheshe bempendulo yamandla busebenzisa i-IGBT njengebhuloho lokulungisa kabusha, futhi imojula yokusebenza ye-IGBT ingafinyelela ukugeleza okuphindwe kabili kwamandla, kuyilapho isebenzisa ama-chips e-DSP anesivinini esiphezulu ukuze kukhiqizwe amapulse okulawula e-PWM. Ngakolunye uhlangothi, ingakwazi ukubuyisela emuva amandla kagesi agciniwe ku-capacitor kuya kugridi yamandla; Ngakolunye uhlangothi, isici samandla okufakwayo singabuye silungiswe ukuze kuqedwe ukungcoliswa kwe-harmonic kugridi yamandla,
Ngesikhathi sokusetshenziswa kwamandla, i-DSP yeyunithi yokulawula ukulungiswa ikhiqiza ama-pulses e-PWM angu-6 aphezulu ukuze ilawule ukuqhutshwa nokunqamuka kwama-IGBT angu-6 ohlangothini lokulungisa. Ukuqhutshwa nokunqamuka kwe-IGBT kusebenza kanye nezinsimbi ukuze kukhiqizwe i-sine waveform yamanje ehambisana nesigaba se-voltage yokufaka, ngaleyo ndlela kuqedwe ama-harmonic akhiqizwa ibhuloho lokulungisa futhi kuqede ukungcoliswa kwe-harmonic kugridi yamandla.
Uma usesimweni sokukhiqiza amandla, amandla abuyiselwa ebhasini le-DC ngokusebenzisa i-diode ohlangothini lwe-inverter, futhi njengoba enqwabelana, i-voltage ebhasini le-DC nayo iyanda. Uma idlula inani elithile, ingxenye yempendulo yamandla ohlangothini lwesilungisi iyaqala, ihlehlisa amandla e-DC ibe amandla e-AC. Ngemva kokulungisa isigaba nobukhulu, idluliselwa emuva kugridi yamandla we-AC ukuze kuzuzwe imiphumela yokonga amandla.