Suppliers of frequency converter energy feedback devices remind you that in modern industrial automation production, the application scope of pumps, fans and other equipment is becoming more and more extensive. Their consumption of electrical energy, throttling losses of baffles, valves and other equipment, as well as daily maintenance and repair costs, account for almost 20% of the cost. This is a considerable production expense. With the development of the economy, the deepening of reforms, and the intensification of market competition, energy conservation and consumption reduction have gradually become an important means to improve product quality and reduce production costs.
1. Basic Theory of Variable Frequency Energy saving Technology
The basic principle of frequency conversion technology is that for a long period of time, the frequency of the alternating current used by electrical equipment is maintained in a fixed state. The application of frequency conversion technology is to make the frequency a resource that can be adjusted and utilized freely. Nowadays, the most active and rapidly developing variable frequency technology is the speed regulation technology of variable frequency.
Frequency conversion technology includes computer technology, power electronics technology, and click transmission technology. It is a comprehensive technology that combines mechanical equipment and strong and weak electricity. It refers to the conversion of the signal of the power frequency current into other frequencies, which is mainly achieved through semiconductor components. Then, the alternating current is converted into direct current, and the inverter regulates the current and voltage while achieving stepless speed regulation of the electromechanical equipment. In summary, frequency conversion technology is to control the speed of a motor by changing the frequency of the current, thereby effectively controlling the motor equipment. These are all achieved on the basis of the year-on-year increase in current frequency and motor speed. The characteristic of frequency conversion technology is that it can ensure the smooth operation of the motor, automatically control acceleration and deceleration, and reduce energy consumption while improving work efficiency.
In the daily use of frequency converters, direct torque control and vector control are mainly used. In the future development of frequency converters, artificial neural networks and fuzzy self optimization control methods will be used. Moreover, as frequency converters continue to develop, their comprehensiveness will become increasingly high. In addition to completing basic speed regulation functions, they also have communication, programmable, and parameter identification functions set internally.
2. Energy saving principle of frequency converter
2.1 Variable frequency energy-saving methods
Ngokusho kwe-fluid mechanics, amandla=ingcindezi * izinga lokugeleza. Izinga lokugeleza nesivinini emandleni okukodwa kuyalingana, ingcindezi ilingana nesikwele sejubane, futhi amandla alingana nekhiyubhu yejubane. Uma ukusebenza kahle kwepompo yamanzi kulungisiwe, lapho izinga lokugeleza liyancipha, isivinini sizokwehla ngokulinganayo, futhi amandla okukhiphayo nawo azokwehla ebuhlotsheni be-cubic. Ngakho-ke, isivinini sephampu yamanzi sicishe silingane nokusetshenziswa kwamandla enjini. Isibonelo, uma injini yepompo yamanzi engu-55kW iguqulelwa ku-80% wejubane layo lasekuqaleni, amandla ayo asetshenziswa ngu-28kW/h, nesilinganiso sokonga amandla esingu-48%. Kodwa uma ijubane lilungiswa ku-50% yasekuqaleni, ukusetshenziswa kwamandla kuba ama-kilowatts angu-6 ngehora, futhi izinga lokonga amandla lifinyelela ku-87%.
2.2 Ukwamukela isinxephezelo sesici samandla okonga amandla
Amandla asebenzayo awabangeli nje kuphela ukuthi izinto zokusebenza zishise futhi andise ukugqokwa kwezintambo, kodwa okubaluleke kakhulu, ukuncipha kwesici samandla kuholela ekwehleni kwamandla asebenzayo wegridi yamandla. Ngenxa yalokho, inani elikhulu lamandla asebenzayo liyasetshenziswa ezintanjeni zamandla, okuholela ekwehleni kokusebenza kahle kwemishini kanye nokumoshakala okukhulu. Ngemva kokusebenzisa idivayisi yokulawula isivinini esishintshashintshayo, ukulahlekelwa kwamandla asebenzayo kuncipha nakakhulu ngenxa ye-capacitor yokuhlunga ngaphakathi kwesiguquli semvamisa, okwandisa amandla asebenzayo wegridi yamandla.
2.3 Ukusebenzisa indlela yokuqala ethambile yokonga amandla
Ngenxa yokuthi i-motor iqalwa nge-Y/D noma isiqalo esiqondile, isiqalo samanje siphindwe kane kuya kasikhombisa kunomanje olinganiselwe, okungadala umthelela ongathi sína kugridi yamandla kanye nezinto zokusebenza ze-electromechanical. Ngaphezu kwalokho, lokhu kudinga umthamo ophezulu kakhulu wegridi yamandla, ukukhiqiza igagasi elikhulu kakhulu ngesikhathi sokuqala, futhi kubangele umonakalo omkhulu kuma-valve nama-baffles ngesikhathi sokudlidliza, okuphinde kube yingozi kakhulu empilweni yesevisi yamapayipi nemishini. Ukusetshenziswa kweziguquli zefrikhwensi kusebenzisa umsebenzi wokuqala othambile wesiguquli sefrikhwensi ukuze kuqalwe okwamanje ukusuka ku-zero, futhi inani eliphakeme ngeke lidlule elamanje elilinganiselwe. Ngakho-ke, umthelela kugridi yamandla kanye nezidingo zomthamo wokunikezwa kwamandla ziyancipha kakhulu, futhi impilo yesevisi yama-valve nemishini yandiswa kakhulu.
3. Izibonelo zokusetshenziswa kobuchwepheshe bokonga amandla obuhlukahlukene
Sisebenzise ukufakwa kwesilawuli sesivinini esishintshashintshayo empompini yamanzi ezungezayo engu-160kW njengesibonelo ukuze sibuyisele amathuluzi okonga amandla ahlukahlukene. Sihlole ukusetshenziswa kukagesi ngaphambi nangemuva kokuthenga kabusha futhi sathola imiphumela egculisa kakhulu.
3.1 Imodi yokulawula ngaphambi kokuguqulwa kwefrikhwensi
Ekusebenzeni kwepompo yamanzi ejikelezayo, lapho izinga lokugeleza lishintsha ngenxa yezidingo zenqubo, kuyadingeka ukulungisa ukuvulwa kwe-pump outlet kanye ne-inlet ukuze ushintshe izinga lokugeleza langempela lepompo. Le ndlela yokulungisa ibizwa ngokuthi ukulungiswa kwe-throttling. Kulesi sibonelo, ukuvulwa kwe-valve ye-outlet ne-inlet cishe ku-60%. Ngokombono wokusetshenziswa kwamandla, lena indlela yokulungisa engenawo umnotho.
3.2 Imodi yokulawula ngemva kokuguqulwa kokuguqulwa kwefrikhwensi
Ekusebenzeni kwepompo yamanzi ejikelezayo, lapho izinga lokugeleza lishintsha ngenxa yezidingo zenqubo, kokubili ama-valve angenayo kanye ne-outlet avuliwe ngokugcwele. Ngokulungisa isivinini semoto, indawo yokusebenza efanelekile nentsha ingatholakala ukuze kutholwe izinga lokugeleza elifanele. Ngokwesimo sangempela kanye nezidingo zasendaweni, ukulawula okwenziwa ngesandla noma okuzenzakalelayo kungenziwa. Kulesi sibonelo, ngenxa yokuthi asikho isidingo sokushintsha njalo izinga lokugeleza, imvamisa yangempela yokusebenza yemoto inqunywa ukuthi ibe ngu-40Hz ngokusekelwe esimweni sangempela kanye nezidingo esizeni, futhi ukulawula okwenziwa ngesandla kwamukelwa ikakhulukazi ukuze konge amandla.
4. Izinguquko ekusebenzeni ngemva kokusebenzisa isistimu yokulawula isivinini esishintshashintshayo
Isiqalo esithambile esiphelele sifinyelelwe. Lapho i-motor iqala, ijubane le-rotor liyakhula kancane kancane ngokuvama kokunikezwa kwamandla okokufaka, okuholela ekwandeni okushelelayo kwejubane. Isikhathi sokuqala salo lonke uhlelo sisethelwe kumasekhondi angaba ngu-20, okungeke kubangele noma yimuphi umthelela ohlelweni futhi bushelelezi kunendlela yokuqala yokuqala.
Umsinga osetshenziswa kugridi kagesi nawo wehliswe kakhulu, okwenza ukusetshenziswa kwezinto zikagesi kuphephe kakhudlwana. Ngesikhathi esifanayo, njengoba imvamisa iyancipha, isivinini se-motor sibuye sinciphe, sinciphise ukuguga kwemishini futhi sinciphise kakhulu amathuba okuhluleka kanye nezindleko zokulondoloza. I-transformer ehlinzeka ngamandla kagesi empompini yamanzi ilondoloze iningi lomthamo wokuphakelwa kwamandla. Ngokunciphisa nje umthwalo osebenzayo, umthamo ogciniwe ungama-kilowatts angama-50, okwenza ngcono ukusebenza kahle kokusetshenziswa kwemishini. Amandla we-motor nawo athuthukisiwe ngendlela efanayo, okwenza ukusebenza kwemoto kube ukonga kakhulu.
Ukusetshenziswa kobuchwepheshe bokuguqula imvamisa kuthuthukise ikhwalithi yomkhiqizo, kwanciphisa ukusetshenziswa kwamandla, ukonga amandla, futhi kwathuthukisa nakakhulu izinzuzo zezomnotho zamabhizinisi. Ukusetshenziswa kobuchwepheshe bokulawula isivinini sokuguqulwa kwemvamisa kudinga ukuguqulwa kwalezi zisetshenziswa ukuze kuzuzwe ukongiwa kwamandla.