Umphakeli weyunithi ye-frequency converter braking unit ukukhumbuza ukuthi ezimeni zokukhiqiza, sivame ukuhlangana nenye inkinga: ungayifinyelela kanjani impendulo yamandla kusuka kumotho ukuya ebhasini le-DC, bese usuka ebhasini le-DC uye kugridi yamandla kagesi we-AC? Ngenxa yokusetshenziswa kwamabhuloho angalawuleki okulungisa ama-rectifier kuma-converter avamile, kufanele kuthathwe ezinye izindlela zokulawula ukuze kuzuzwe lokhu.
Indlela ephumelela kakhulu yokufinyelela ukudluliswa kwamandla okuqondiswa kabili phakathi kwesekethe ye-DC kanye nomthombo wamandla ukusebenzisa ubuchwepheshe be-inverter obusebenzayo: okungukuthi, ukuguqula amandla kagesi avuselelwe abe namandla e-AC wefrikhwensi efanayo nesigaba njengegridi futhi uyibuyisele kugridi, ngaleyo ndlela uzuze ukubhuleka.
Umdwebo wohlelo lokubhuleka kwegridi yempendulo
Njengoba kuboniswe emfanekisweni, umdwebo wesimiso wokubhuleka kwegridi yempendulo, osebenzisa isilungisi samanje se-PWM sokulandela ngomkhondo, esenza kube lula ukuzuza ukugeleza kwamandla okuqondiswa kabili futhi enesivinini sokuphendula esiguqukayo esisheshayo. Ngaleso sikhathi, le topology isivumela ukuthi silawule ngokugcwele ukushintshana kwamandla asebenzayo futhi asebenzayo phakathi kwezinhlangothi ze-AC ne-DC.
Izici zamabhuleki
a. Isetshenziswa kakhulu kuzimo zokubhuleka impendulo yamandla yokudluliswa kwe-PWM AC, esebenza kahle kakhulu okonga amandla;
b. Ayikhiqizi izingxenye zamanje ze-harmonic ezihlelekile, ezihambisana nemvelo;
c. Isici samandla ≈ 1;
d. Ohlelweni lokudluliswa kwezimoto eziningi, amandla okuvuselela omshini ngamunye ngamunye angasetshenziswa ngokugcwele;
e. Londoloza utshalomali futhi ulawule kalula izingxenye zamandla ezivumelanayo nezisebenzayo ohlangothini lwegridi;