Ka tswelopele e potlakileng ya moruo wa naha ya rona, haholoholo kgolo e potlakileng ya diindaseteri tsa merafo, tse qhibidisang le tsa ho qhibidila lahla, tlhokahalo ya motlakase e ntse e eketseha.Har'a bona, lisebelisoa tsa ho lokisa sebōpi sa maqhubu a mahareng ke e 'ngoe ea lisebelisoa tse kholo ka ho fetisisa tsa tlhahiso ea matla a harmonic, empa hobane bahlahisi ba bangata ba fokotsa litšenyehelo tsa sehlahisoa 'me ha ba kenye lisebelisoa tsa theknoloji ea khatello ea harmonic, marang-rang a hona joale a matla a sechaba a silafatsoa haholo ke li-harmonics tse kang haze weather .Pulse ea hona joale e fokotsa ts'ebetso, phetisetso le ts'ebeliso ea matla a motlakase, e futhumatsa lisebelisoa tsa motlakase, e baka ho thothomela le lerata, ho koala lilemo, ho khutsufatsa bophelo ba ts'ebeletso, esita le ho baka ho hloleha kapa ho chesa.Li-Harmonics li ka baka resonance ea lehae e tšoanang kapa letoto la li-resonance tsa sistimi ea matla, ka hona, ea holisa litaba tsa harmonic le ho etsa hore li-capacitor li chese le lisebelisoa tse ling.Harmonics e ka boela ea baka tšebeliso e mpe ea li-relay tsa ts'ireletso le lisebelisoa tse ikemetseng le ho ferekanya litekanyo tsa matla.Harmonics kantle ho sistimi ea matla e ka kena-kenana haholo le lisebelisoa tsa puisano le lisebelisoa tsa elektroniki.
Sebōpi sa motlakase sa maqhubu a mahareng ke e 'ngoe ea mehloli e meholo ka ho fetisisa ea har'a moroalo oa marang-rang, hobane e fetoloa maqhubu a mahareng ka mor'a ho lokisoa.Harmonics e tla beha ts'ebetso e bolokehileng ea marang-rang a motlakase kotsing.Ka mohlala, hona joale ha harmonic e tla etsa hore ho be le tahlehelo e eketsehileng ea tšepe e phahameng-frequency vortex ho transformer, e leng se tla etsa hore transformer e chese haholo, e fokotse molumo oa motlakase, e eketse lerata la transformer, 'me e be kotsing e tebileng ea bophelo ba tšebeletso ea transformer. .Phello e khomarelang ea maqhubu a harmonic e fokotsa karolo ea kamehla ea mokhanni le ho eketsa tahlehelo ea mohala.Harmonic voltage e ama ts'ebetso e tloaelehileng ea lisebelisoa tse ling tsa motlakase ho marang-rang, e bakang liphoso tsa ts'ebetso ho lisebelisoa tsa taolo ea othomathiki le netefatso ea tekanyo e sa nepahalang.Harmonic voltage le hona joale li ama ts'ebetso e tloaelehileng ea lisebelisoa tsa puisano tsa peripheral;overvoltage ea nakoana le overvoltage ea nakoana e bakoang ke li-harmonics e senya lera la ho kenya letsoho la mochini le lisebelisoa, e leng se bakang liphoso tsa mekhahlelo e meraro le tšenyo ea li-transformer;harmonic voltage le Palo ea hona joale e tla baka karolo ea letoto la resonance le parallel resonance ho marang-rang a matla a sechaba, ho baka likotsi tse kholo.Ts'ebetsong ea ho khomarela liphetoho tse sa khaotseng, ntho ea pele eo u ka e fumanang ho tloha ho DC ke motlakase oa square wave, o lekanang le superposition ea li-harmonics tse phahameng.Le hoja potoloho ea morao-rao e hloka ho hloekisoa, li-harmonics tse phahameng li ke ke tsa hloekisoa ka ho feletseng, e leng lebaka la ho hlahisa li-harmonics.
Re qapile li-filters tse hlophisitsoeng ka mokhoa o le mong tsa makhetlo a 5, 7, 11 le 13.Pele ho puseletso ea filthara, matla a karolo ea ho qhibiliha ha sebōpi sa motlakase sa maqhubu a mahareng ke 0.91.Kamora hore sesebelisoa sa matšeliso a sefa se kenngoe tšebetsong, puseletso e phahameng ke 0.98 capacitive.Kamora ho sebelisa sesebelisoa sa mats'eliso a filthara, sekhahla sa phallo ea motlakase (boleng ba THD) ke 2.02%.Ho ea ka matla a boleng ba matla a GB/GB/T 14549-1993, boleng ba voltage harmonic (10KV) bo ka tlase ho 4.0%.Kamora ho sefa ea 5th, 7th, 11th le 13th harmonic hajoale, sekhahla sa ho sefa se ka ba 82∽84%, se fihlang boleng bo lumelletsoeng ba maemo a k'hamphani ea rona.Phello e ntle ea puseletso.
Ka hona, re lokela ho sekaseka lisosa tsa li-harmonics le ho nka mehato ea ho hatella li-harmonics tse phahameng, tse bohlokoa ho netefatsa ts'ebetso e bolokehileng le e moruo ea litsamaiso tsa matla.
Ntlha ea pele, sesosa sa li-harmonics tsa sebōpi sa maqhubu a mahareng
1. Li-Harmonics li hlahisoa ke meroalo e sa tsitsang, e kang li-rectifiers tse laoloang ke silicon, lisebelisoa tsa matla a ho fetola, joalo-joalo Leqhubu la harmonic le hlahisoang ke mojaro ona ke palo e kholo ea makhetlo a mangata a sebetsang.Ka mohlala, karolo e meraro ea likarolo tse tšeletseng tsa pulse rectifier haholo-holo e hlahisa li-harmonics tsa 5th le 7th, ha karolo e meraro ea 12-pulse rectifier e hlahisa haholo-holo ea 11 le ea 13.
2. Ka lebaka la li-harmonics tse hlahisoang ke meroalo ea li-inverter tse kang li-furnaces tsa maqhubu a mahareng le li-inverters, ha se feela li-harmonics tsa bohlokoa tse hlahisoang, empa hape le li-harmonics tse nyenyane tseo maqhubu a tsona a leng makhetlo a mabeli a makhetlo a mabeli a inverter.Ka mohlala, sebōpi sa maqhubu a mahareng se sebetsang ho 820 Hz se sebelisa mochine o motlakase oa mekhahlelo e meraro ha se hlahise li-harmonics tsa 5 le 7 feela, empa hape le li-harmonics tse fokolang ho 1640 Hz.
Harmonics e teng hammoho le grid hobane lijenereithara le li-transformer li hlahisa li-harmonics tse nyane.
2. Kotsi ea li-harmonics seboping sa maqhubu a mahareng
Tšebelisong ea libono tsa maqhubu a mahareng, palo e kholo ea li-harmonics e hlahisoa, e lebisang tšilafalong e tebileng ea marang-rang a matla.
1. Li-harmonics tse phahameng li tla hlahisa matla a motlakase kapa a hona joale.Tšusumetso e matla e bolela matla a nako e khuts'oane a ho feta (tlase) a sistimi, ke hore, lebelo la hang-hang la motlakase le sa feteng 1 millisecond.Pulse ena e ka ba e ntle kapa e mpe, 'me e ka ba le letoto kapa tlhaho ea oscillatory, e etsang hore sesebelisoa se che.
2. Harmonics e fokotsa phetisetso le ts'ebeliso ea matla a motlakase le lisebelisoa tsa thermoelectric, e hlahisa ho sisinyeha le lerata, e etsa hore lipheletsong tsa eona e be lilemo, e fokotsa bophelo ba ts'ebeletso, esita le ho se sebetse kapa ho chesa.
3. E ama lisebelisoa tsa matšeliso a matla a sebetsang a tsamaiso ea motlakase;ha ho na le li-harmonics ka har'a marang-rang a matla, motlakase oa capacitor o eketseha ka mor'a hore capacitor e kenngoe, 'me hona joale ka capacitor e eketseha le ho feta, e leng ho eketsang tahlehelo ea matla ea capacitor.Haeba pulse e teng hona joale e phahame, capacitor e tla be e fetile-hona joale 'me e laetsoe, e tla chesa capacitor le ho potlakisa ho phunyeha ha thepa ea bohale.
4. Sena se tla fokotsa lebelo le bophelo ba tšebeletso ea lisebelisoa tsa motlakase le ho eketsa tahlehelo;e ama ka ho toba matla a tšebeliso le sekhahla sa tšebeliso ea transformer.Ka nako e ts'oanang, e tla eketsa lerata la transformer mme e khutsufatse haholo bophelo ba tšebeletso ea transformer.
5. Libakeng tse nang le mehloli e mengata ea harmonic ho marang-rang a matla, esita le palo e kholo ea ho senyeha ha li-capacitor tsa elektronike tse ka hare le tsa ka ntle li ile tsa etsahala, 'me li-capacitor tsa substation li chesoa kapa li khoptjoa.
6. Harmonics e ka boela ea baka ts'ireletso ea relay le ho hloleha ha sesebelisoa ka boiketsetso, ho baka pherekano tekanyong ea matla.Ena ke bokantle ba tsamaiso ea matla.Harmonics e baka tšitiso e tebileng ho lisebelisoa tsa puisano le lisebelisoa tsa elektroniki.Ka hona, ho ntlafatsa boleng ba matla a sebōpi sa maqhubu a mahareng ho fetohile sepheo se seholo sa karabo.
Three, intermediate frequency sebōpi harmonic mokhoa oa ho laola.
1. Ntlafatsa bokhoni ba potoloho e khuts'oane ea sebaka sa khokahanyo ea sechaba sa marang-rang a matla le ho fokotsa tšitiso ea harmonic ea sistimi.
2. Harmonic matšeliso a hajoale a amohela filthara ea AC le sefa se sebetsang.
3. Eketsa palo ea pulse ea lisebelisoa tsa converter ho fokotsa harmonic hona joale.
4. Qoba ho resonance ea capacitor parallel le moralo oa tsamaiso inductance.
5. Sesebelisoa se thibelang maqhubu a phahameng se kopantsoe ka letoto la motlakase oa motlakase oa DC ho thibela ho phatlalatsoa ha li-harmonics tse phahameng.
7. Khetha mokhoa o motle oa wiring oa transformer.
8. Thepa e arotsoe ka lihlopha bakeng sa phepelo ea matla, 'me sesebelisoa sa ho hloekisa se kenngoa.
Tse 'ne, lisebelisoa tsa taolo ea har'a sebopi se mahareng
1. Hongyan passiv filter sesebelisoa.
Hongyan passiv filter sesebelisoa.Tšireletso ke mohanyetsi oa letoto la capacitor, 'me filthara ea passive e entsoe ka capacitor le resistor ka letoto,' me tokiso e hokahane ho isa bohōleng bo itseng.Ka makhetlo a khethehileng, ho hlahisoa loop e tlase ea impedance, joalo ka 250HZ.Ena ke sefe ea bohlano ea harmonic.Mokhoa ona o ka lefella li-harmonics le matla a sebetsang, 'me o na le mohaho o bonolo.Leha ho le joalo, bothata bo ka sehloohong ba mokhoa ona ke hore matšeliso a eona a angoa ke ho sitisoa ha marang-rang le boemo ba ho sebetsa, 'me ho bonolo ho lumellana le tsamaiso, ho fella ka amplification ea harmonic, overload esita le tšenyo ea kristale ea metsi. sefefo.Bakeng sa meroalo e fapaneng haholo, ho bonolo ho etsa hore ho be le matšeliso a tlaase kapa a overcompensation.Ho phaella moo, e ka lefella feela li-harmonics tse tsitsitseng tsa maqhubu, 'me phello ea matšeliso ha e ntle.
2. Hongyan e sebetsang filtara thepa
Li-filters tse sebetsang li baka maqhubu a harmonic a boholo bo lekanang le antiphase.Etsa bonnete ba hore hona joale lehlakoreng la phepelo ea motlakase ke leqhubu la sine.Khopolo ea motheo ke ho theha matšeliso a hona joale a nang le matla a tšoanang le a moroalo oa harmonic hona joale le ho fetola boemo, le ho tlosa matšeliso a hona joale ka mojaro oa harmonic hona joale ho hlakola pulse hona joale.Ena ke mokhoa oa ho felisa lihlahisoa, 'me phello ea ho sefa e betere ho feta li-filters tse sa sebetseng.
3. Mosireletsi oa Hongyan Harmonic
Mosireletsi oa harmonic o lekana le karabelo ea letoto la capacitor.Hobane impedance e tlase haholo, hona joale ho tla phalla mona.Ha e le hantle sena ke karohano ea impedance, kahoo motlakase oa harmonic o kentsoeng tsamaisong o rarollotsoe.
Lisireletsi tsa Harmonic hangata li kentsoe ka pel'a lisebelisoa tse bobebe.Ke lihlahisoa tsa boleng bo holimo tsa taolo ea li-harmonic, tse ka hananang le tšusumetso ea ho ts'oara, ho monya li-harmonics tse phahameng ka makhetlo a 2 ~ 65, le ho sireletsa lisebelisoa.Taolo ea Harmonic ea lisebelisoa tsa ho laola mabone, lik'homphieutha, lithelevishene, lisebelisoa tsa ho laola lebelo la likoloi, lisebelisoa tsa motlakase tse ke keng tsa senyeha, lisebelisoa tsa mochine oa CNC, li-rectifiers, lisebelisoa tse nepahetseng, le mekhoa ea ho laola elektronike.Li-harmonics tsena kaofela tse hlahisoang ke lisebelisoa tsa motlakase tse se nang moeli li ka baka ho hloleha ho tsamaiso ea kabo ka boeona kapa lisebelisoa tse amanang le sistimi.Mosireletsi oa harmonic a ka felisa li-harmonics mohloling oa matla a matla, 'me ka bohona a felisa li-harmonics tse phahameng, lerata le phahameng haholo, li-spikes tsa pulse, surges le litšitiso tse ling ho lisebelisoa tsa motlakase.Mosireletsi oa harmonic a ka hloekisa phepelo ea motlakase, a sireletsa lisebelisoa tsa motlakase le lisebelisoa tsa matšeliso, a thibela mosireletsi ho khoptjoa ka phoso, ebe a boloka ts'ebetso e bolokehileng ea lisebelisoa tsa motlakase sebakeng se phahameng.
Nako ea poso: Apr-13-2023