14-11-2014, 10:51 AM
Abstracts: The implementation of Active Filters in this modern electronic age has become an increasingly essential element to the power network. Power electronic devices classified collectively as ‘nonlinear loads’, such as computers, printers, faxes, fluorescent lighting and most other office equipment all create harmonics. The main source of production of harmonics are the' INDUCTION FURNACE’ used in many industries. So it is very essential to reduce the harmonics in induction furnace to improve the power supply quality. The major issues associated with the supply of harmonics to nonlinear loads are severe overheating and insulation damage. Increased operating temperatures of generators and transformers degrade the insulation material of its windings. This would permanently damage the device and result in loss of generation causing widespread blackouts. One solution to this foreseeable problem is to install active filters for each nonlinear load in the power system network. The installation of active filters proves indispensable for solving power quality problems in distribution networks such as harmonic current compensation, reactive current compensation, voltage sag compensation, voltage flicker compensation and negative phase sequence current compensation. Basically there are two types of Active filters [1]SERIES ACTIVE FILTER [2]SHUNT ACTIVE FILTER. Series active power filters are operated mainly as a voltage regulator and as a harmonic isolator between the nonlinear load and the utility system. The series connected filter protects the consumer from an inadequate supply voltage quality. The cost of shunt active ?lters is high, and they are dif?cult to implement in large scale. Additionally, they also present lower ef?ciency than shunt passive ?lters. So in this project we are making”HARMONIC REDUCTION BY SERIES FILTER FOR MAINTAINING POWER QUALITY”.