Mitigation Harmonic with LCL Passive Fitler in off-Grid PV System

Year 2018, Volume: 2 Issue: 1, 9 - 20, 30.06.2018

Süleyman Adak

Abstract

Working of power systems stable and safety depends
on the foundation of quantities such as voltage and current which are sinusoidal
and 50 Hz frequency. However, these foundation quantities lose their sinusoidal
characteristics because of many reasons unwanted harmonics component occur in the
off-grid power system. It is a highly preferred method to use passive LCL
filter for reduction harmonic components occur in the solar system.The proposed
power system is a combination of solar panels, DC/DC boost converter , solar inverter,
six-pulse rectifier, passive  LCL filters
and R-L inductive load.  A six-pulse
uncontrolled rectifier produces 5th, 7th, 11th, 13th, 17th, 19th, etc.
harmonics components.A passive LCL filter is used to reduce input current of Total
Harmonic Distortion (THD_I) of  three-phase uncontrolled rectifier. Off-grid power
system is modeled by using Matlab/Simulink package program.  Simulation results show that THD_I
value reduced from 89,89 %  to 2,927 %. As
a result, LCL filter  improves both system
efficiency and reliability in off-grid power system.

Keywords

LCL filter, Total harmonic distortion (THD), Off-grid PV system

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