Yintoni iTotal Harmonic Distortion(THD)?
Iyonke i-Harmonic Distortion (THD) lubudlelwane obusebenza rhoqo obunceda ukulinganisa ubungakanani bendlela inkqubo ekhupha ngayo igalelo lekopi. . Ingumlinganiselo wokuphazamiseka kwe-harmonic ekhoyo kwisignali kwaye ichazwa njengomlinganiselo wesambuku samagunya azo zonke iinxalenye ze-harmonic kumandla okuphindaphinda okusisiseko. Oku kuya kunxulumana nonikezelo lwamandla kuphela kwaye kuphela kwecandelo elenza naluphi na uhlobo lwamaza. Ixabiso eliphantsi leTHD, ingxolo encinci okanye ukuphazamiseka kwindlela yokuphuma kwenkqubo.
Kuvavanyo ngalunye rhoqo, ixabiso leTHD liphakathi kwe-0 kunye ne-1:
ZERO - Ixabiso elisondele kwi-zero lithetha ukuba imveliso inokuphazamiseka okuphantsi kwe-harmonic. Imveliso ye-sine wave inecandelo eliphindaphindayo elifana negalelo.
ENYE - Ixabiso elisondeleyo kwi-1 lithetha ukuba kukho ukuphazamiseka okukhulu kwe-harmonic kwisiginali. Phantse yonke imixholo yefrikhwensi kwisignali yahlukile kwifrikhwensi yesiginali yokufaka.
I-THD inokubonakaliswa njengepesenti, ukusuka kwi-0 ukuya kwi-100%, apho i-100% ihambelana ne-1.
Kwizicelo ezininzi, iTHD ephantsi iyafuneka. I-THD ephantsi ithetha ukuba imveliso yenkqubo ifana negalelo lenkqubo kunye nokuphazamiseka okuncinci.
Kutheni ibalulekile nje?
Okokuqala, njengenkcazo, ii-harmonics zi-voltages okanye ii-currents eziphindaphinda kwi-frequency esisiseko, kwaye i-Australia yi-50 Hz: 100, 150, 200 Hz, njl njl. amaza omoya asisiseko akhoyo kwisixhobo sombane esingenamda kunye nesixhobo sombane.
Abaqhubi be-LED yimithombo yamandla e-elektroniki kwii-luminaires ze-LED eziqulethe izixhobo zokuvuselela (i-reactance kunye ne-capacitive components). Azikho izixhobo ezingeyo-linear kuba ziguqula i-wave wave yangoku etsalwa kwisignali yombane obonelelweyo kwaye ibonakala ingaphantsi kwe-sinusoidal.
Uninzi lwabaqhubi be-LED baquka ibhulorho ye-diode yokulungisa uphawu lokufaka i-AC ukuze isebenze imodyuli ye-DC LED. Ukusebenza kokutshintsha kwezi bhulorho ze-diode kuvelisa i-discontinuous current ethi ekugqibeleni igqwethe i-sine wave.
Ngoko ke, xa umqhubi we-LED exhunywe kwinkqubo yamandla ephambili, ivelisa i-harmonic currents ephazamisa umbane wokubonelela. Kwaye i-luminaires engaphezulu (kunye nabaqhubi be-LED abangewona umgca) kwisiphaluka, ukuphazamiseka okukhulu kwindlela yokusabalalisa amandla, okwenza ukuba ingasebenzi kakuhle, ichaphazela ukusebenza kwezinye izixhobo kunye nokugqithisa i-wiring.
Kungenxa yoko le nto inkcazo yombane yesixhobo sokukhanyisa kufakelo olutsha ihlala ifuna ukuba ubuninzi beTHD yokukhanya bube ngaphantsi kwe-15%.