Analysis and Validation for an Inverter-side Current Controller in LCL Grid-connected Power Systems

doi:10.35833/MPCE.2018.000505

Home > Archive>Volume 8, Issue 2, 2020 >387-398. DOI:10.35833/MPCE.2018.000505

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Analysis and Validation for an Inverter-side Current Controller in LCL Grid-connected Power Systems

DOI:

10.35833/MPCE.2018.000505

Author:

Jose M. Sosa ^{^1,2}
Jose M. Sosa
Tecnologico Nacional de Mexico / ITS de Irapuato (TecNM / ITESI), Irapuato, GTO 36821, Mexico;School of Sciences, Autonomous University of San Luis Potosi (UASLP), San Luis Potosi, SLP 78290, Mexico
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Panfilo R. Martinez-Rodriguez ^{^2,3}
Panfilo R. Martinez-Rodriguez
School of Sciences, Autonomous University of San Luis Potosi (UASLP), San Luis Potosi, SLP 78290, Mexico;Tecnologico de Monterrey, Monterrey, N.L. 64849, Mexico
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Gerardo Escobar ^{^3,4}
Gerardo Escobar
Tecnologico de Monterrey, Monterrey, N.L. 64849, Mexico;
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Gerardo Vazquez ^{^1,2}
Gerardo Vazquez
Tecnologico Nacional de Mexico / ITS de Irapuato (TecNM / ITESI), Irapuato, GTO 36821, Mexico;School of Sciences, Autonomous University of San Luis Potosi (UASLP), San Luis Potosi, SLP 78290, Mexico
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Andres A. Valdez-Fernandez ^{^2,3}
Andres A. Valdez-Fernandez
School of Sciences, Autonomous University of San Luis Potosi (UASLP), San Luis Potosi, SLP 78290, Mexico;Tecnologico de Monterrey, Monterrey, N.L. 64849, Mexico
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Juan F. Martinez-Garcia ^{^2,3}
Juan F. Martinez-Garcia
School of Sciences, Autonomous University of San Luis Potosi (UASLP), San Luis Potosi, SLP 78290, Mexico;Tecnologico de Monterrey, Monterrey, N.L. 64849, Mexico
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Affiliation:

1.Tecnologico Nacional de Mexico / ITS de Irapuato (TecNM / ITESI), Irapuato, GTO 36821, Mexico;2.School of Sciences, Autonomous University of San Luis Potosi (UASLP), San Luis Potosi, SLP 78290, Mexico;3.Tecnologico de Monterrey, Monterrey, N.L. 64849, Mexico

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Abstract:

Transformerless grid-connected inverters offer greater efficiencies when transferring power from renewable energy sources to the electrical grid. If the grid-inverter connection is done with an LCL filter, high attenuation of switching harmonics is achieved while preserving a small-size output filter. However, damping must be included in the controller to assure closed-loop stability. This paper proposes a reference computation methodology for the inverter-side current feedback in a photovoltaic (PV) generation system connected to the grid through an LCL filter. Theoretical analysis of the closed-loop system stability and of the steady-state performance are presented as well as experimental validation of the closed-loop performance. The feedback controller includes active damping and relies on a resonant control structure which improves the ability of dealing with grid harmonic distortion. The controller uses a reduced set of measurements, which requires the inverter-side current and grid voltage only, and assures a power factor close to unity.

Key words:LCL filter ; transformerless inverter ; grid connection ; inverter-side current feedback

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Received:November 06,2018
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Online: March 24,2020
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