Qhov loj ntawm cov khoom siv hluav taws xob thiab cov kev siv cov khoom siv khiav ceev ceev
2.1 Qhov tseem ceeb ntawm electromagnetic cuam tshuam
Electromagnetic cuam tshuam, kuj hu ua electromagnetic disturbance (EMI), yog qhov cuam tshuam ntawm lub tshuab hluav taws xob sab nraud thiab cov pliaj tsis xav pauv hauv kev txais tos, feem ntau los ntawm kev sib tsuam hluav taws xob thiab hauv daim teb. Tus choj rectifier ntawm tus choj sib txuas yog qhov tsis muaj linear load rau lub hwjchim, thiab qhov sib haum ntawm nws yuav ua rau muaj kev cuam tshuam rau lwm cov khoom siv hluav taws xob thiab hluav taws xob ntawm tib daim phiaj siv hluav taws xob. Tsis tas li ntawd, feem ntau ntawm cov inverters ntawm qhov inverter siv PWM tshuab. Thaum lawv ua hauj lwm nyob rau hauv hom kev hloov thiab hloov ntawm kev kub ceev, ib qho loj npaum li cas ntawm kev sib tsoo suab paj nruag yog tsim tawm. Yog li, tus inverter yog ib qho khoom siv hluav taws xob rau lwm qhov khoom siv hluav taws xob thiab hluav taws xob hauv lub cev. Ntawm qhov tod tes, harmonic cuam tshuam hauv lub hwjchim daim phiaj no cuam tshuam nrog cov zaus sib txuas ntawm lub hwj huam khoom ntawm cov khoom siv zaus sib hloov. Muaj ntau qhov chaw ntawm cov teeb meem sib haum xeeb hauv lub hwj chim, xws li ntau yam khoom siv rectifier, cov twj AC thiab DC, cov khoom hluav taws xob hloov khoom siv, cov khoom tsis muaj linear thiab cov khoom siv teeb pom kev zoo. Cov ntim no ua rau lub suab seev thiab qhov hluav taws xob nyob rau hauv lub hwjchim kom muaj teebmeem, uas tuaj yeem ua rau muaj teeb meem cuam tshuam lwm yam khoom hauv lub hwjchim. Tom qab lub hwj huam ntawm qhov hluav taws xob los ntawm cov kab hauv lub hauv paug, yog tias nws tsis ua tiav, lub suab nrov sib tsoo yuav cuam tshuam nrog inverter los ntawm kab sib chaws. Lub mains cuam tshuam ntawm lub hwj huam mov rau inverter yog overvoltage, undervoltage, instantaneous fais fab tuag; ntog, poob; ntsia hlau loj hluav taws xob; xov tooj cua zaus cuam tshuam. Secondly, hom hom cuam tshuam los ntawm cov teeb liab tswj ntawm qhov inverter yuav cuam tshuam nrog rau qhov kev lag luam ntawm qhov inverter.
2.2 Txoj kev ntawm kev cuam tshuam electromagnetic
Tus inverter yuav ua kom muaj kev sib haum xeeb nrog kev muaj zog dua thiab muaj kev cuam tshuam rau lwm yam khoom siv hauv lub cev. Txoj kev cuam tshuam no zoo ib yam nkaus nrog kev sib txuas lus electromagnetic cuam tshuam, feem ntau muab faib rau hauv hluav taws xob electromagnetic, conduction, thiab inductive coupling. Tshwj xeeb: 1 tsim cov pa electromagnetic rau cov khoom hluav taws xob thiab hluav taws xob; 2 ua rau suab nrov electromagnetic mus rau tsav ncaj qha tsav, kom lub hlau poob thiab tooj liab noj ntawm lub zog nce, thiab ua rau cuam tshuam rau lub hwj chim qhov chaw, thiab kis mus rau lwm cov khoom siv los ntawm lub zog fais fab network; 3 Cov inverter inductively khub niam txiv uas nyob ib sab rau induce interference voltage los yog tam sim no. Ib yam li ntawd, cov teebmeem kev cuam tshuam rau hauv qhov system cuam tshuam nrog kev lag luam ntawm cov zaus sib txuas los ntawm tib txoj kev.
