Power Factor Correction/Control (PFC)
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1 Power Facor Correcion/Conrol (PFC) Prof. Dr. Ing. Ralph Kennel Technische Universiä München Elecrical Drive Sysems and Power Elecronics Arcissraße München
2 Reacive Power Volage Curren Reacive Power
3 Acive Power Volage Curren Acive Power
4 Acive Power Volage Curren Acive Power of course, his can mahemaically be spli ino a consan erm (acive power) and a variable erm (reacive power)
5 Acive Power his is, however, a mahemaical operaion only because here is no ime wih elecrical charge flowing back in realiy his is pulsaing acive power only!!! Acive Power of course, his can mahemaically be spli ino a consan erm (acive power) and a variable erm (reacive power)
6 Acive Power physically his is no really reacive power because here is no ime wih elecrical charge flowing back in realiy his is pulsaing acive power only!!! Acive Power of course, his can mahemaically be spli ino a consan erm (acive power) and a variable erm (reacive power)
7 Acive Power pulsaing acive power reacive power in realiy his is pulsaing acive power only!!! Acive Power
8 P F C = Power Facor Conrol Power Facor = P W (acive power) P S (apparen power)
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15 PFC volage curren wih diode recifiers and fully conrolled recifier bridges, he power facor is normally cos = 1 cos = 1 oday harmonics are a more severe issue! alhough his has nohing o do wih "PFC", "PFC" is ofen used o refer o he compensaion of harmonics
16 Charging Converer B4-Brücke mi kapaziiver Las Sromkurvenform oday harmonics are a more severe issue! alhough his has nohing o do wih " PFC", " PFC " is ofen used o refer o he compensaion of harmonics
17 Charging Converer B4-Brücke mi kapaziiver Las Sromkurvenform prohibied in public power grid (because of grid nework perurbaions)
18 Charging Converer B4-bridge wih capacive load harmonics specrum wihou filering H1 H3 H5 H7 H9 H11 H13 H15 H17 H19 H21 prohibied in public power grid (because of grid nework perurbaions) he filering would be considerable!
19 Charging Converer 3-phase B6-diode bridge wih capacive load curren waveform harmonics specrum oher soluion: fully conrolled acive fron endconverer (AFE) he filering would be considerable!
20 Charging Converer U 0 mains mooring - - curren waveform - regeneraion line curren line volage oher soluion : fully conrolled grid-ie-converer
21 Charging Converer + + U 0 mains - harmonics specrum - wih opimized filering H1 H3 H5 H7 H9 H11 H13 H15 H17 H19 H21
22 Charging Converer fully-conrolled grid-side grid-ie-converer curren waveform harmonics specrum neverheless!!! even wih good single-phase "PFC" eiher he baeries are pulsaingly charged (law of energy conservaion!) or a emporary buffer sore for energy is needed
23 Charging Converer fully-conrolled grid-side grid-ie-converer curren waveform harmonics specrum no even a ricky conrol can change anyhing for ha!!! neverheless!!! even wih good single-phase "PFC" eiher he baeries are pulsaingly charged (law of energy conservaion!) or a emporary buffer sore for energy is needed
24 Charging Converer fully-conrolled grid-side grid-ie-converer curren waveform harmonics specrum no even a ricky conrol can change anyhing for ha!!! or can i? neverheless!!! even wih good single-phase "PFC" eiher he baeries are pulsaingly charged (law of energy conservaion!) or a emporary buffer sore for energy is needed
25 PFC volage curren how should he associaed curren look like, so ha here can be a consan power flow? power of course a u = 0 and/or i = 0 no power can be ransmied (law of energy conservaion!) wih an energy sorage device (capacior) he bridging ime (= energy), however, is considerably smaller!
26 PFC volage curren is his curren waveform accepable??? power once you calculae he harmonics specrum i is suprising, how close one can ge his curren waveform, wihou exceeding he accepable limis for harmonics
27 PFC volage curren is his curren waveform accepable??? power once you calculae he harmonics specrum some companies use his effec o reduce he DC link capaciance, bu of course, hey don ell i around.
28 Thank You!!! Any Quesions? Prof. Dr.-Ing. Ralph Kennel Technische Universiä München Elecrical Drive Sysems and Power Elecronics
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