Partial preview of the text
Download final exam preparation and more Exams Power Electronics in PDF only on Docsity!
ao2ba University, Institute of Technology, School of Electrical and Computer Engineer aneneeeeensn a a= Academic Year 2013/14 | Power Electronics and Drives eet Ok eceeeat Instruction: 60% Pints Attempt all the five questions. Marks given to each question 1, 2, 3, 4and 5 are 14 pts, 10 pts, 12 pts. The sixth question is a bonus. Answers and steps of computation should be readable and shown clearly. If there is un Final Examination information, appropriate engineering assumption can be made. Examination is closed book, Any sort of cheating in the examination will result zero in the course. eee eae eee eae 9 pts, 15 pts, and -given parameter or __ a. Consider 3-phase Inverter Bridge shown Tf OE Aenearcnnsees aucex dee eeneeevenerens s etoereeeeervenees f +0000 CC CerD REEDS Asxrexnncenemnee sr in Fig. la. It is controlled to Hroduce' a ee Revveresernneceeet troveoneenennaramer Freer ae grrr omen re Gene ' 60 Hz, 6-step (180-degree) three phase T2 Se eee antes + sstewwanwunanedeeoy + cainietfaiankivinaivorie + maaeteutndetae ‘ fede eeleueaakamenaaa ‘ eslacsientetelambaiinintaae ' voltage at 50 Hz. V,-=220 V. Ye eee ao moe : T4 ¢ 3 , ' 4 5 Te See See ee seceeeesa ; SS8 Set eeeseeeaeae r SSS See eee eee eee r See Ses eee eee ee r cesses ters erere 7 Sees ese eee eee ee 1 a) Draw the switching pattern of the !'% Kem Lavin: ea inane Lesmoieeaignaaaeeaai . . . . . ; i : ‘ i ; switches indicating time voltage T6 : en ; We puotiad oe ae x i : ; waveform for phase U, V, W and line 29 ft ' eee eee Lae Se Nae voltage U-\V/. Use the graph given on the U POReRO ROH RER RROD ossoneaneranvean BP RR RK ON RRC RC OCR - cK KER RKAR OR ER { cece RAR eRe e ; Seeeeeeeeneaneenes f ; 4 ' i ' ' Heh pet aes 3 b) Calculate RMS of the fundamental phase pa | manson fears aes ete ee ‘ 1 ' ' ? + eee ee Sovesesnsnnsseren ticcsccennsemse dnovaceonensnanics ircsrensnnreveners deerevsennvvoreeeve ‘ c) Calculate the total harmonic distortion Vi ae ee oe fe ae alae oC SSSR e eee ees OF Trt ttaasennecasna qn annnassndaiaaeeadqusacanccdcansns das ipddadnsnneehabsdee heseisesecanibonce of the output voltage. ; 3 moe oe a ere WE OS, ee d) If the inverter is enntroiled as PWM= — teil Kasssnsnsasanseces Ananoussansnnances b aauxsouaneanennice Lasnscuuanrmarssupen Aes cadastekiugis ; inverter using sine-triangle modulation AMMAN EKK RRR ER adit, eneane a_i seawoeewereedees | A009 tetCesewenknnn i KO WARK Rowe i | : : : technique, what will be the modulation = |——----~ fo fo nea fon frre Pe ee | Ue ee einanag hen nae eee Die Se eee ' index to produce 50 V RMS fundamental! W Ssennaenemeaseaoe ixanueennanaanesas : Gukananaaeeananes Mecncpeuneetee aes Spatinsiuncanien iL coatersuaaaieecs ’ ‘ i ' ‘ 4 Bee I pestis Snceciascaeeaie Pelee i Sane J nsnansssoshereeneutenetlerersenceoce eons Se ae Pr rrr TT ter rT t Pesesssnsaencsssaa frsnnssancnnvonscadnansacansnnsssageabvusceesanantsonsnabnnensoesasantnensh a a ' ‘ ‘ ' sia 1 ..b nthe eee 
