Frequency converters anoshandiswa zvakanyanya muiyo inosiyana yekumhanyisa transmission system indasitiri mukugadzira maindasitiri.Nekuda kwesimba rekuchinja maitiro eiyo inverter rectifier wedunhu, yakajairwa discrete system mutoro inogadzirwa pane yayo yekuchinja magetsi.Iyo frequency converter inowanzo shanda panguva imwe chete nemamwe maturusi akadai semakomputa uye masensa pane saiti.Midziyo iyi inonyanya kuiswa pedyo uye inogona kukanganisa imwe neimwe.Naizvozvo, magetsi emagetsi emagetsi anomiririrwa ne frequency converter ndechimwe chezvakakosha zveharmonic mugedhi remagetsi eruzhinji, uye kusvibiswa kweharmonic kunogadzirwa nemagetsi emagetsi midziyo yave chipingamupinyi chikuru pakuvandudzwa kwesimba remagetsi tekinoroji pachayo.
1.1 Chii chinonzi harmonics
Chikonzero chikuru cheharmonics ndeye discrete system kurodha.Kana yazvino ichiyerera nemutoro, hapana hukama hwemutsara neiyo yakashandiswa voltage, uye ikozvino imwe kunze kwe sine wave inoyerera, ichigadzira yakakwirira harmonics.Harmonic frequencies ndiwo akati wandei akawanda eiyo yakakosha frequency.Zvinoenderana nemusimboti wekuongorora weFrench mathematician Fourier (M.Furier), chero inodzokororwa waveform inogona kupatsanurwa kuita sine wave zvikamu zvinosanganisira yakakosha frequency uye harmonics yenhevedzano yeakakosha frequency akawanda.Harmonics is sinusoidal waveforms, uye imwe neimwe sinusoidal waveform inowanzo ine yakasiyana frequency, amplitude, uye phase angle.Harmonics inogona kukamurwa kuita kunyange uye isinganzwisisike harmonics, yechitatu, yechishanu uye yechinomwe manhamba isinganzwisisiki harmonics, uye yechipiri, yegumi neina, yechitanhatu uye yechisere nhamba dzinotove harmonics.Semuenzaniso, kana iyo yakakosha wave iri 50Hz, yechipiri harmonic i10Hz, uye yechitatu harmonic i150Hz.Muzhinji, zvisinganzwisisiki harmonics zvinokuvadza zvakanyanya kudarika kunyange harmonics.Mune yakaenzana-nhatu-phase system, nekuda kwekuenzana, kunyange harmonics yakabviswa uye chete isinganzwisisiki harmonics iripo.Kune matatu-phase rectifier load, the harmonic current is 6n 1 harmonic, yakadai se5, 7, 11, 13, 17, 19, nezvimwewo. The soft starter key inokonzera 5th uye 7th harmonics.
1.2 Miyero yakakodzera yekutonga kweharmonic
Inverter harmonic control inofanirwa kutarisisa kune zvinotevera zviyero: anti-kupindira zviyero: EN50082-1, -2, EN61800-3: radiation zviyero: EN5008l-1, -2, EN61800-3.Kunyanya IEC10003, IEC1800-3 (EN61800-3), IEC555 (EN60555) uye IEEE519-1992.
Iyo general anti-kupindira zviyero EN50081 uye EN50082 uye frequency inoshandura chiyero EN61800 (1ECl800-3) inotsanangura iwo radiation uye anti-kupindira mazinga emidziyo inoshanda munzvimbo dzakasiyana.Iwo ataurwa pamusoro apa mwero anotsanangura anogamuchirika mwero wemwaranzi pasi pemamiriro akasiyana ezvakatipoteredza: level L, hapana muganho wemwaranzi.Yakakodzera vashandisi vanoshandisa zvinyoro nyoro munzvimbo dzisina kukanganiswa dzechisikigo uye vashandisi vanogadzirisa radiation sosi zvirambidzo vega.Kirasi h ndiyo muganho wakataurwa ne EN61800-3, yekutanga nharaunda: muganhu kugovera, yechipiri nharaunda.Senge sarudzo yeredhiyo frequency sefa, yakashongedzerwa neredhiyo frequency sefa inogona kuita iyo yakapfava inotangisa kusangana neyekutengesa nhanho, iyo inowanzo shandiswa munzvimbo isiri yemaindasitiri.
2 Harmonic kudzora matanho
Matambudziko eHarmonic anogona kudzorwa, kukanganiswa kwemwaranzi uye kupindira kwemagetsi emagetsi kunogona kudzvanywa, uye matanho ehunyanzvi akadai sekudzivirira, kuzviparadzanisa nevamwe, kuisa pasi, uye kusefa anogona kutorwa.
(1) Isa passive sefa kana inoshanda sefa;
(2) Simudza transformer, deredza hunhu hunokanganisa dunhu, uye bvisa tambo yemagetsi;
(3) Shandisa green soft starter, hapana pulse current kusvibiswa.
2.1 Kushandisa passive kana inoshanda mafirita
Passive mafirita akakodzera kushandura hunhu impedance yekuchinja magetsi emagetsi pama frequency akakosha, uye akakodzera masisitimu akagadzikana uye asingashanduke.Active mafirita akakodzera kutsiva discrete system mitoro.
Passive mafirita akakodzera nzira dzechinyakare.Iyo passive sefa yakatanga kutanga nekuda kwechimiro chayo chakareruka uye chakajeka, yakaderera purojekiti kudyara, kuvimbika kwekushanda kwakanyanya uye mutengo wakaderera wekushanda.Ivo vanoramba vari nzira dzakakosha dzekudzvinyirira pulsed currents.Iyo LC sefa ndeyechinyakare passive yakakwirira-odha harmonic kudzvinyirira mudziyo.Iyo musanganiswa wakakodzera wesefa capacitor, marejitari uye resistors, uye yakabatana mukufambirana neiyo yakakwira-order harmonic sosi.Pamusoro pebasa rekusefa, rinewo basa remuripo risiri iro.Midziyo yakadaro ine zvimwe zvipingamupinyi zvisingakundiki.Kiyi yacho iri nyore kwazvo kuremerwa, uye inopisa kana yaremerwa, izvo zvinozoita kuti simba ripfuure mwero, muripo uye kurangwa.Uye zvakare, mafirita epamhepo haasadzoreki, saka nekufamba kwenguva, kuwedzera ebrittlement kana network mutoro shanduko inoshandura inoteedzana resonance uye kuderedza iyo sefa maitiro.Zvinotonyanya kukosha, iyo passive sefa inogona kungosefa imwe yepamusoro-yakarongeka harmonic chikamu (kana paine sefa, inogona chete kusefa yechitatu harmonic), kuitira kuti kana akasiyana e-high-order harmonic frequencies achisefa, mafirita akasiyana anogona kushandiswa kuwedzera. midziyo mari.
Kune akawanda marudzi emafirita anoshanda munyika dzakasiyana siyana pasirese, anogona kuteedzera uye kudzoreredza pulse currents emhando dzakasiyana uye amplitudes, uye hunhu hwekuripa hahuzokanganiswe nehunhu hwekuita kwegidhi remagetsi.Iyo yekutanga dzidziso yeanoshanda einjiniya mafirita akazvarwa mu1960s, ichiteverwa nekuvandudzwa kweiyo hombe, yepakati uye diki yekuburitsa simba rakazara-yakabatanidzwa redunhu tekinoroji, kuvandudzwa kwepulse wide modulation control system, uye harmonics yakavakirwa pa instantaneous speed reactive load theory.Chikumbiro chakajeka chezvino chekukurumidza kukurumidza chekutarisa nzira chakakonzera kukurumidza kuvandudza kweanoshanda einjiniya mafirita.Pfungwa yayo yakakosha ndeyekutarisa harmonic ikozvino inobva kune chinangwa chemuripo, uye midziyo yekubhadhara inogadzira bhendi yenguva yakawanda yekubhadhara ikozvino ine saizi yakafanana uye yakatarisana nepolar seiyo harmonic ikozvino, kuitira kuti ibvise pulse ikozvino inokonzerwa nepulse current. kunobva mutsara wepakutanga, uye wozoita ikozvino yemagetsi network Chete zvakakosha servings inosanganiswa.Chikamu chikuru ndeye harmonic wave jenareta uye otomatiki control system, ndiko kuti, inoshanda kuburikidza nedhijitari yemifananidzo yekugadzirisa tekinoroji iyo inodzora inokurumidza insulating layer triode.
Panguva ino, muchikamu cheyakakosha pulse ikozvino kutonga, passive mafirita uye anoshanda mafirita akaonekwa ari muchimiro cheanopindirana uye akasanganiswa maapplication, achiita zvizere mabhenefiti eanoshanda mafirita senge akareruka uye akajeka chimiro, kugadzirisa nyore, mutengo wakaderera. , uye kuita kwakanaka kwemuripo.Iyo inobvisa kukanganisa kwevhoriyamu yakakura uye yakawedzera mutengo weiyo inoshanda sefa, uye inosanganisa izvo zviviri pamwechete kuita kuti iyo yese system software iwane kuita kwakanyanya.
2.2 Deredza kuvharika kwechiuno uye cheka nzira yekufambisa
Mhedzisiro yekugadzirwa kweharmonic inokonzerwa nekushandiswa kwemitoro isina mutsara, saka, mhinduro inokosha ndeyekuparadzanisa mitsara yemagetsi e-harmonic-generating mitoro kubva kumagetsi emagetsi e-harmonic-sensitive mitoro.Iyo yakakanganiswa yazvino inogadzirwa neasina mutsara mutoro inoburitsa yakakanganiswa kudonha kwemagetsi pane iyo impedance yetambo, uye iyo synthesized yakakanganiswa voltage waveform inoshandiswa kune mamwe mitoro yakabatana kune imwechete mutsara, uko yakakwirira harmonic currents inoyerera.Naizvozvo, matanho ekudzikisa pulse ikozvino kukuvara anogona zvakare kuchengetedzwa nekuwedzera muchinjiko-chikamu nharaunda yetambo uye kudzikisa loop impedance.Parizvino, nzira dzakadai sekuwedzera simba rekushandura, kuwedzera nzvimbo ye-cross-sectional yetambo, kunyanya kuwedzera nzvimbo ye-cross-sectional yetambo dzisina kwazvakarerekera, uye kusarudza zvinhu zvinodzivirira zvakadai semabreaker breakers uye fuse zvinoshandiswa zvakanyanya muChina.Nekudaro, iyi nzira haigone kubvisa zvachose harmonics, asi inoderedza hunhu hwekudzivirira uye mabasa, inowedzera mari, uye inowedzera yakavanzika njodzi mumagetsi ekupa system.Batanidza mitsetse mitsetse uye isina-mutsara mitoro kubva kune imwechete magetsi magetsi
Mapoinzi ekubuda (PCCs) anotanga kupa simba kudunhu rega rega, saka iyo yekunze-ye-frame voltage kubva kune discrete mitoro haigone kuendeswa kune mutsara mutoro.Iyi ndiyo mhinduro yakanaka kune ikozvino harmonic dambudziko.
2.3 Isa emerald green inverter simba pasina harmonic kusvibiswa
Iyo yemhando chiyero chegirinhi inverter ndeyekuti iyo yekupinza uye inobuda mafungu ari sine mafungu, iyo yekupinza simba chinhu inodzoreka, iyo simba chinhu chinogona kuiswa kune 1 pasi pemutoro chero upi zvawo, uye iyo inobuda frequency yemagetsi frequency inogona kudzorwa zvisina tsarukano.Iyo yakavakirwa-mukati AC reactor ye frequency converter inokwanisa kudzvanya maharmonics uye kuchengetedza bhiriji rekudzoreredza kubva kusimba repakarepo pamawere emagetsi emagetsi.Kudzidzira kunoratidza kuti harmonic yazvino isina reactor iri pachena yakakwira kupfuura iyo ine reactor.Kuti uderedze kupindira kunokonzerwa nekusvibiswa kweharmonic, sefa yeruzha inoiswa mune inobuda dunhu reiyo frequency converter.Kana iyo frequency converter ichibvumira, iyo inotakura frequency ye frequency converter inoderedzwa.Mukuwedzera, mu-high-power frequency converters, 12-pulse kana 18-pulse rectification inowanzoshandiswa, nokudaro kuderedza harmonic content mumagetsi emagetsi nekubvisa low harmonics.Semuenzaniso, 12 pulses, yakaderera harmonics ndeye 11th, 13th, 23rd, uye 25th harmonics.Saizvozvo, kune gumi nemasere pulses, mashoma eharmonics ndeye 17th uye 19th harmonics.
Iyo yakaderera harmonic tekinoroji inoshandiswa mumanyoro ekutanga inogona kupfupikiswa sezvizvi:
(1) Iyo yakatevedzana kuwanda kweiyo inverter magetsi ekupa module inosarudza 2 kana nezve 2 yakatevedzana-yakabatana inverter magetsi ekupa modules, uye inobvisa iyo harmonic zvikamu zvinoenderana nekuunganidza waveform.
(2) The rectifier circuit inowedzera.Pulse width modulation soft starters inoshandisa 121-pulse, 18-pulse kana 24-pulse rectifiers kuderedza pulse currents.
(3) Kushandisazve inverter simba modules munhevedzano, nekushandisa 30 single-pulse series inverter power modules uye kushandisazve simba redunhu, iyo pulse ikozvino inogona kuderedzwa.
(4) Shandisa itsva DC frequency conversion modulation nzira, senge diamond modulation yekushanda voltage vector zvinhu.Parizvino, vazhinji vanogadzira inverter vanoisa kukosha kukuru kune dambudziko reHarmonic, uye nehunyanzvi vanovimbisa kusvibira kweiyo inverter panguva yekugadzira, uye nekugadzirisa dambudziko rekuwirirana.
3 Mhedziso
Kazhinji, tinogona kunzwisisa zvakajeka chinokonzera harmonics.Panyaya yekushanda chaiko, vanhu vanogona kusarudza mafirita anofamba uye mafirita anoshanda kudzikisa hunhu hweiyo loop, kucheka nzira yakabatana yekutapurirana kweharmonic, kugadzira uye kushandisa girinhi yakapfava yekutanga pasina kusvibiswa kweharmonic, uye kushandura iyo yakapfava Iyo harmonics inogadzirwa ne iyo yekutanga inodzorwa mukati mechikamu chidiki.
Nguva yekutumira: Kubvumbi-13-2023