Txhawm rau siv passive lim lossis cov lim dej tsis ua haujlwm
May 23, 2025| Qhov tseem ceeb ua rau muaj kev sib raug zoo yog vim tsis muaj kev thauj khoom. Thaum qhov tam sim no ntws los ntawm lub nra, nws tsis muaj txoj kev sib raug zoo nrog kev siv voltage, uas ua rau tsis-sinusoidal tam sim no thiab yog li tsim kev sib raug zoo. Feem ntau hais lus, qhov kev tsim txom tshwm sim los ntawm khib-kev ua kom muaj zog yog ntau dua thiab tseem ceeb tshaj li ntawm txawm tias muaj kev sib raug zoo. Hauv kev sib npaug ntawm peb-theem system, vim yog cov symmetry, txawm-ua kom muaj kev sib haum xeeb tau raug tshem tawm, thiab tsuas yog khib-kev txiav txim siab ua ke muaj nyob. For three-phase rectifier loads, the harmonic currents that occur are 6n ± 1 order harmonics, such as 5, 7, 11, 13, 17, 19, etc. The inverter mainly generates 5th and 7th order harmonics.
Harmonic mitigation tov:
1. Txo lub impedance ntawm Circuit Court thiab txiav tawm cov txheej txheem sib kis
Qhov tseem ceeb ua rau muaj kev sib raug zoo yog kev siv cov haujlwm tsis sib xws. Yog li, txoj kev daws teeb meem yog cais cov fais fab khoom siv ntawm cov thauj khoom uas tsim kev sib raug zoo los ntawm cov khoom uas muaj kev sib raug zoo. Cov khoom siv tam sim no tshwm sim los ntawm cov tuav tsis tau ua rau cov hluav taws xob hluav taws xob ntws ntawm cov kab hluav taws xob, thiab sib xyaw ua ke rau ntawm cov kab sib txuas, ua rau muaj kev sib xyaw ua ke ntws los ntawm nws. Yog li, ntsuas los txo cov kev puas tsuaj ntawm cov kev ua kom muaj zog kuj tseem tuaj yeem ua tiav los ntawm kev nce qib hla ntawm cov cable thiab txo qhov kev cuam tshuam ntawm Circuit Txwv.
2. Siv cov ntxaij lim dej lossis cov lim dej tsis ua haujlwm
Lub hom phiaj tseem ceeb ntawm kev siv lub lim passive yog hloov kho lub zog ntawm lub zog hluav taws xob ntawm cov chaw tshwj xeeb, thiab nws yog qhov tsim nyog rau kev ruaj khov thiab tsis hloov pauv
Thaum kev siv cov lim lim dej feem ntau yog rau kev them nyiaj rau cov khoom tsis yog linear.
Cov ib yam kev coj ua feem ntau ua haujlwm lim dej siab. Lub LC lim yog tsim cov kev sib txuas ua ke tsim nyog ntawm cov hluav taws xob capacitors, inductors thiab resistors, thiab txuas nrog rau kev sib txuas nrog cov kev sib cav sib ceg nrog cov khoom sib txuas lus nrog cov khoom sib txuas lus. Dhau li uas muaj cov nyhuv lim, nws tseem muaj kev ua haujlwm ntawm kev them nyiaj rau hluav taws xob. Txawm li cas los xij, cov cuab yeej no yog nquag dhau. Thaum overloaded, nws yuav raug puas thiab tej zaum yuav ua rau muaj kev sib txawv ntawm kev sib txawv, ua kom nplua. Ib qho ntxiv, cov ntxaij lim dej tsis tuaj yeem tswj tau, yog li cov khoom siv hluav taws xob hloov pauv, cov zaus uas muaj peev xwm hloov pauv, thiab cov nyhuv lim yuav tsis kam. Cov ntxaij lim dej tseem ceeb dua, passive ntxaij lim dej tsuas yog lim ib hom kev sib haum xeeb (piv txwv li, ib co lim dej tsuas yog lim tawm ntawm lub ntsej muag thib peb). Yog tias cov khoom sib txawv sib txawv yuav tsum tau lim, cov lim sib txawv yuav tsum muaj, uas nce cov cuab yeej siv peev.
Jinneng Hluav Taws Xob Tsawg-Voltage nquag Siv Hluav Taws Xob Lim (APF) Nws yog cov cuab yeej uas nyiam rau kev daws teeb meem kev daws teeb meem. Cov cuab yeej no siv cov txiaj ntsig kev nce qib tam sim no-lub sijhawm them txoj kev los tshem tawm cov kab mob sib tsoo. Los ntawm kev tshawb nrhiav tsis tu ncua ntawm cov harteronic thiab reactive Cheebtsam ntawm lub nra, nws siv cov kev taw qhia sib luag tab sis kev sib txawv rau hauv lub zog thiab xa tawm. Qhov no ua tiav cov haujlwm ntawm kev tsim txom kev sib raug zoo thiab kev them nqi kho mob uas muaj lub zog txawv.