Impendulo evela kumphakeli weyunithi ikukhumbuza ukuthi ohlelweni lokulawula isivinini esishintshashintshayo, lapho umthwalo wenjini ungamandla anamandla, njengamayunithi okumpompa insimu kawoyela, ama-hoists wokumba, njll; Noma imithwalo emikhulu ye-inetia efana namafeni, amapayipi kasimende, imishini yokulinganisa ashukumisayo, njll; Lapho imithwalo yamabhuleki esheshayo idingeka ezigayweni zensimbi, amapulani amakhulu e-gantry, ama-spindle amathuluzi omshini, njll., injini nakanjani ingena inqubo yokukhiqiza amandla. Okusho ukuthi, i-motor rotor ihudulwa amandla angaphandle noma umzuzu womthwalo we-inertia uyagcinwa, okubangela ukuthi isivinini sangempela semoto sibe sikhulu kunokukhishwa kwesivinini sokuvumelanisa ngesiguquli sefrikhwensi. Amandla kagesi akhiqizwa injini azogcinwa ku-DC bus filtering capacitor yesiguquli sefrikhwensi. Uma la mandla engasetshenzisiwe, i-voltage yebhasi ye-DC izokhuphuka ngokushesha, ithinte ukusebenza okuvamile kwesiguquli sefrikhwensi.
Iyunithi yempendulo yamandla, ngokuthola ngokuzenzakalelayo i-voltage yebhasi ye-DC yesiguquli sefrikhwensi, iguqula i-voltage ye-DC yesixhumanisi se-DC yesiguquli sefrikhwensi ibe i-voltage ye-AC ekwifrikhwensi nesigaba esifanayo ne-voltage yegridi. Iyunithi yempendulo yamandla yesiguquli semvamisa ixhunywe kugridi ye-AC ngemva kwezixhumanisi eziningi zokuhlunga umsindo, ngaleyo ndlela kufezwe injongo yempendulo yamandla kugridi. Iyunithi yempendulo yamandla yesiguquli sefrikhwensi icaphuna ukuthi ugesi obuyiselwe kugridi ufinyelela ngaphezu kuka-97% wamandla akhiqiziwe, okonga ugesi ngempumelelo.
Umgomo nezici zeyunithi yempendulo yamandla aphezulu
1. Ukwamukela imodi ye-AC-DC-AC eqondile yamandla aphezulu (high high), isici esiyinhloko sokushintsha isifunda yi-IGBT. I-hivert yvf high-voltage inverter isebenzisa uchungechunge lokuxhunywa kwamayunithi amandla kanye nendlela estakiwe yokukhulisa igagasi.
2. Iyunithi yamandla isebenzisa i-IGBT ekulungiseni okuvumelanayo, futhi isilawuli sokulungisa esivumelanayo sithola i-voltage yokufaka yeyunithi yegridi ngesikhathi sangempela. Isithombe seyunithi yempendulo yamandla sesiguquli sefrikhwensi sisetshenziselwa ukuthola isigaba sevolthi yokufaka yegridi kusetshenziswa ubuchwepheshe bokulawula okukhiywe ngesigaba. Ngokulawula umehluko wesigaba phakathi kweshubhu ye-rectifier inverter switch kanye ne-grid voltage, ukuhamba kwamandla kagesi phakathi kwegridi neyunithi yamandla kungalawulwa. Isigaba esihlanekezelwe, iyunithi yamandla ibuyisela amandla kagesi kugridi, kuyilapho ngokuphambene, amandla kagesi ajovwa kuyunithi yamandla asuka kugridi. Ubukhulu bamandla kagesi bulingana ngokuqondile nomehluko wesigaba. Ubukhulu nesiqondiso samandla kagesi kunqunywa iyunithi voltage. Mayelana nokulungiswa okuvumelanayo, uhlangothi lokulungisa lulingana neyunithi yempendulo yamandla yesiguquli esizinzile sokunikezwa kwamandla kwe-crane. Umehluko wesigaba phakathi kwegridi yamandla kanye ne-inverter ehambisana nobukhulu nesiqondiso samandla kagesi ukhiqizwa ukuchezuka phakathi kweyunithi kagesi kanye nenani lokusetha iyunithi ngomthetho we-PID.
Ukulungiswa kwempendulo yamandla emishini yamakhemikhali amadala akukwazi nje ukuqinisekisa iyunithi yempendulo yamandla aphezulu esanda kuthuthukiswa, kodwa futhi kuqhube ukuhlolwa kokuguga emikhiqizweni yeyunithi yempendulo yamandla aphezulu ngaphansi kwezimo ezihlukahlukene zomthwalo. Iyunithi yokuhlola ingaxhunywa kumthwalo we-RL wempahla yokuguga ukuze kwenziwe ukuhlolwa kokusebenza komthwalo emikhiqizweni. Yenza ukusebenza komkhiqizo kuzinze futhi kuphelele.