Abstract --UPFC-Unified Power Factor Control

UPFC-Unified Power Factor Control This This proj projec ectt prov provid ides es cont contin inuo uous us powe powerr fact factor or corre correct ctio ion n with without out manu manual al capacitive capacitive bank loading. loading. A PFC controller controller provides provides power factor factor correction and peak current limiting for a switch-mode power converter of any topology buck! boost or buck boost"! without having to directly sense inductor current. The PFC control techni#ue involv involves es using using a piecew piecewise ise-po -poly lynomi nomial al analog analog comput computer er AC" AC" to comput computee power power transistor on-times in accordance with separate polynomial transfer functions for powerfactor control and peak-current-linking using as inputs current representations of line input voltage $%&"! load output voltage $%'"! and long-term current demand $C'". A conduction cycle is initiated by sensing when the rate of change in the inductor current reaches reaches (ero using an au)iliary au)iliary winding on the current storage inductor! inductor! and terminated terminated after the computed on-time to implement either power-factor control or peak-currentlimiting.

The *eactive Power charge on your electricity bill is directly targeted against those companies companies who do not demonstrat demonstratee clear energy efficiency efficiency use. +ou will find this charge itemi(ed on electricity bill. *eactive power charges can be made significantly smaller by the introduction of Power Factor Correction Capacitors which is a widely recogni recogni(ed (ed method method of reduci reducing ng an electr electrical ical load load and minim minimi(i i(ing ng wasted wasted energy! energy! improving improving the efficiency efficiency of a plant and reducing reducing the electric electricity ity bill. bill. ,t is not always always necessary to reach a power factor of . A cost effective solution can be achieved by increasing your power factor to greater than ./0

This project uses regulated 0$! 10mA power supply. 120 three terminal voltage regulator regulator is used for voltage regulation. regulation. 3ridge type full wave rectifier rectifier is used to rectify the ac out put of o f secondary of 4564$ step down transformer.

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Ph7 8/ /95::24

Ameerpet: ;A-1! 4nd floor! b akers! Ameerpet! ?yderabad @ 15. Miyapur ‘X’ Roads: ;4! eher Pla(a! &ear >arada $idya andir! iyapur BD *oads! ?yderabad - :/.

Tis pro!ect pro"ides us wit te learnin#’s on te followin# aspects:

.
. *egulated Power >upply. 4. icrocontroller. 5. *esistive load. :. ,nductive load. 0. *elay bank unit. 9. Current transformer. 1. Potential transformer. 2. Eero-crossing detector. /. %C' display. . %<' indicators.

&oftware’s used:

. P,C-C compiler for
Ph7 8/ /95::24

Ameerpet: ;A-1! 4nd floor! b akers! Ameerpet! ?yderabad @ 15. Miyapur ‘X’ Roads: ;4! eher Pla(a! &ear >arada $idya andir! iyapur BD *oads! ?yderabad - :/.

4. P,C kit 4 programmer for dumping code into icro controller. 5. <)press >C? for Circuit design. :. Proteus for hardware simulation.

Re#ulated Power &upply:

'loc% dia#ram:

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Ph7 8/ /95::24

Ameerpet: ;A-1! 4nd floor! b akers! Ameerpet! ?yderabad @ 15. Miyapur ‘X’ Roads: ;4! eher Pla(a! &ear >arada $idya andir! iyapur BD *oads! ?yderabad - :/.

UPFC-Unified Power Factor Control (C)

Re#ulated power supply

(C) dri"er

(+) indicators

Crystal ,scillator

Micro controller

*ero-Crossin# )etector sensor Current transformer

Capacitors $an% 

Relay unit

Resisti"e load

./0 Power supply

1nducti"e load &witces

Potential Transformer

>tep down T6F

3ridge *ectifier 

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Filter Circuit

*egulator  Power supply to all sections Ph7 8/ /95::24

Ameerpet: ;A-1! 4nd floor! b akers! Ameerpet! ?yderabad @ 15. Miyapur ‘X’ Roads: ;4! eher Pla(a! &ear >arada $idya andir! iyapur BD *oads! ?yderabad - :/.