Design of an LLCL type filter for stand-alone PV systems’ harmonics

Year 2019, Volume: 3 Issue: 1, 36 - 50, 31.03.2019

Suleyman Adak , Hasan Cangi , Ahmet Serdar Yılmaz

https://doi.org/10.30521/jes.506076

Cited By: 11

Abstract

This paper is
regarding the design, modeling and simulation for reducing harmonics with
passive LLCL filter in off-grid solar system. It is desired that current and
voltage waveforms are to be in the sinusoidal form during energy generation
from stand-alone solar systems. This condition can be provided by the most
important one of the main factors which to determine the quality of electrical
energy. Due to the harmonics produced by the non-linear loads, the waveform of
the current and voltage is distorted from the sinusoidal form. The passive LLCL
filter is designed and analyzed for mitigation of the total harmonic distortion
for current (THDI) in the proposed off-grid PV system. The passive
LLCL filter is practically installed between solar inverter and non-linear
load. Simulation results are in a good compliance with the theoretical
analysis. This study describes a design methodology of a LLCL filter for
off-grid power system with a comprehensive study of how to mitigate the
harmonics in off-grid solar system. The using of a LLCL filter mitigates
the THDI that injected by a six pulse rectifier which is used as a
non-linear load. The simulation result shows that the reduction of THDI
from 89.89% to 3.257%. This paper attempts to show that the using of LLCL
filter with a stand-alone solar system can highly improve the power quality of
the system.

Keywords

PV module model, Passive LLCL harmonic filter, Total harmonic distortion (THD), Off-grid PV system

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