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2DOF-based current controller for single-phase grid-connected voltage source inverter applications

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  • López-Alcolea, Francisco Javier
  • Molina-Martínez, Emilio J.
  • Parreño Torres, Alfonso
  • Vázquez, Javier
  • Roncero-Sánchez, Pedro

Abstract

This paper presents the design of a discrete-time control scheme for the current injected into the grid by a single-phase voltage source inverter (VSI). The VSI is connected to the grid by means of an LCL filter that attenuates the switching harmonics present in the output waveform of the inverter. The current control is based on a resonant regulator implemented in a Two-Degrees-Of-Freedom (2DOF) scheme that allows the location of all the poles to be defined in the closed loop of the system without the need for observers and measuring only the current injected into the grid. This control scheme, therefore, allows the attenuation of the resonance frequency of the LCL filter and requires no additional damping methods with which to mitigate the resonance phenomenon. The design parameters can be obtained using a fairly straightforward mathematical approach that involves only operations with real numbers. The simulation and experimental results obtained show that the control scheme performs correctly even considering changes in the grid inductance.

Suggested Citation

  • López-Alcolea, Francisco Javier & Molina-Martínez, Emilio J. & Parreño Torres, Alfonso & Vázquez, Javier & Roncero-Sánchez, Pedro, 2023. "2DOF-based current controller for single-phase grid-connected voltage source inverter applications," Applied Energy, Elsevier, vol. 342(C).
    • Handle: RePEc:eee:appene:v:342:y:2023:i:c:s0306261923005433
    DOI: 10.1016/j.apenergy.2023.121179
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    References listed on IDEAS

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