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 |
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Page view: 115
Net amount: 649 |
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Author:
Jose M. Sosa1,2,Panfilo R. Martinez-Rodriguez2,3,Gerardo Escobar3,4,Gerardo Vazquez1,2,Andres A. Valdez-Fernandez2,3,Juan F. Martinez-Garcia2,3
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Author 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. |
Keywords: |
LCL filter ; transformerless inverter ; grid connection ; inverter-side current feedback |
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Received:November 06, 2018
Online Time:2020/03/24 |
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