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Energies 2017, 10(3), 336; doi:10.3390/en10030336

An Improved LCL Filter Design in Order to Ensure Stability without Damping and Despite Large Grid Impedance Variations

1
Université de Tunis El Manar, Ecole Nationale d’Ingénieurs de Tunis, LR 11 ES 15, Laboratoire des Systèmes Electriques, BP 37-1002 Tunis le Belvédère, Tunisie
2
Laboratoire des Systèmes et Applications des Technologies de l’Information et de l’Energie, University of Cergy-Pontoise, 33 bd du Port, 95000 Cergy-Pontoise, France
*
Author to whom correspondence should be addressed.
Academic Editor: Miquel Castilla
Received: 4 November 2016 / Accepted: 9 February 2017 / Published: 9 March 2017
(This article belongs to the Special Issue Control and Communication in Distributed Generation Systems)
View Full-Text   |   Download PDF [4553 KB, uploaded 10 March 2017]   |  

Abstract

With the smart grid revolution, there is a growing interest in the use of power converters associated to LCL filters to interface between the main utility grid and loads or renewable energy sources. LCL filters are commonly used mainly due to their low cost and high filtering performances. To achieve these performances, it is necessary to meticulously pick out the LCL filter parameters, taking into account grid code requirements and grid configuration and/or conditions. Several methodologies for LCL filter design have been presented and discussed in the literature. The main goal of this paper is to propose a simple, robust and systematic design methodology for LCL filter parameter tuning. The considered design methodology is aimed to overcome the shortcomings of classical design methodologies, namely, stable operation under different grid configurations and conditions. Compared to previous works, the proposed design methodology allows the achievement of robust LCL filter design with regard to large grid impedance variations without the use of any damping method. Also, it takes into account accuracy of capacitor standard values and proposes a simple design method for the converter side inductor that avoids saturation problems. An example of LCL filter design is presented and discussed. The obtained filter parameters were firstly tested using a Matlab-Simulink software tool. After that, they were tested through the development of an experimental set-up. The obtained simulation and experimental results show the reliability and efficiency of the proposed design methodology. View Full-Text
Keywords: LCL filter; design methodology; grid connected power converter; total harmonic distortion factor (THD); weak grid conditions LCL filter; design methodology; grid connected power converter; total harmonic distortion factor (THD); weak grid conditions
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Said-Romdhane, M.B.; Naouar, M.W.; Belkhodja, I.S.; Monmasson, E. An Improved LCL Filter Design in Order to Ensure Stability without Damping and Despite Large Grid Impedance Variations. Energies 2017, 10, 336.

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