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APFC System for Industrial Use

The document describes an automatic power factor correction system for industrial power use to minimize penalties. It uses a microcontroller to detect the phase difference between the supply voltage and current using zero crossing detectors. Based on the detected phase difference, it controls relays to bring shunt capacitors into the circuit to maintain the power factor near unity. The system includes hardware components like a microcontroller, op-amps, LCD, capacitors, relays, and relay driver. It requires software like Keil compiler and can be programmed in embedded C or assembly languages.

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Abhijit Pattnaik
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124 views2 pages

APFC System for Industrial Use

The document describes an automatic power factor correction system for industrial power use to minimize penalties. It uses a microcontroller to detect the phase difference between the supply voltage and current using zero crossing detectors. Based on the detected phase difference, it controls relays to bring shunt capacitors into the circuit to maintain the power factor near unity. The system includes hardware components like a microcontroller, op-amps, LCD, capacitors, relays, and relay driver. It requires software like Keil compiler and can be programmed in embedded C or assembly languages.

Uploaded by

Abhijit Pattnaik
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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APFC (Automatic Power Factor Compensation) FOR

INDUSTRIAL POWER USE TO MINIMISIE PENALITY


ABSTRACT
The project is designed to minimize penalty for industrial units using automatic power factor
correction unit.
In this proposed system, two zero crossing detectors are used for detecting zero crossing of

voltage and current. The time lag between the zero-voltage pulse and zero-current pulse is duly
generated by suitable operational amplifier circuits in comparator mode is fed to two interrupt
pins of a microcontroller. It displays time lag between the current and voltage on an LCD. The
program takes over to actuate appropriate number of relays from its output to bring shunt
capacitors into load circuit to get the power factor till it reaches near unity. The capacitor bank
and relays are interfaced to the microcontroller using a relay driver. The microcontroller used in
this project belongs to 8051 family.
Furthermore, the project can be enhanced by using thyristor control switches instead of relay
control to avoid contact pitting often encountered by switching of capacitors due to high in rush
current.

BLOCK DIAGRAM

HARDWARE REQUIREMENTS:

SOFTWARE REQUIREMENTS:

8051 series Microcontroller, Op-amps, LCD, Shunt


Capacitors, Relays, Relay driver IC, Choke,
Crystal, Switches, Slide Switch, Resistors,
Capacitors,
Diodes,
Transformer,
Voltage
Regulator, Lamp.

Keil compiler
Languages: Embedded C or Assembly

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