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Methodology for Impedance Spectroscopy of Photovoltaic Modules Using a Power Converter.

Diego Alejandro Herrera-Jaramillo1, Juan David Bastidas-Rodríguez2, Carlos Andrés Ramos-Paja3

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Summary

This study introduces a low-cost method for Impedance Spectroscopy (IS) on photovoltaic (PV) systems using a power converter. This approach enables accurate in situ diagnostics without expensive equipment.

Keywords:
impedance spectroscopyphotovoltaic modulessynchronous boost converter

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Renewable Energy

Background:

  • Impedance Spectroscopy (IS) is crucial for analyzing electrochemical systems like batteries and photovoltaic (PV) devices.
  • Traditional IS methods rely on costly Frequency Response Analyzers (FRAs), limiting in situ diagnostics.
  • PV performance and degradation studies require accessible and flexible characterization tools.

Purpose of the Study:

  • To develop a cost-effective methodology for performing IS on PV systems.
  • To eliminate the need for specialized and expensive external equipment for PV diagnostics.
  • To validate a novel converter-based IS approach for accurate impedance characterization.

Main Methods:

  • A power converter was utilized to perform IS measurements on a PV system, replacing traditional FRAs.
  • Theoretical analysis of converter dynamics derived duty cycle amplitude for constant perturbation magnitude.
  • Experimental validation involved a synchronous Boost converter, a PV panel, and a digital signal processor (DSP) for perturbation injection.
  • Voltage and current measurements were conducted using an oscilloscope.

Main Results:

  • The proposed converter-based IS method accurately reproduced impedance spectra compared to a commercial FRA.
  • The methodology demonstrated feasibility as a low-cost solution for PV impedance characterization.
  • The approach proved to be flexible and scalable for various PV diagnostic applications.

Conclusions:

  • A novel, economical, and efficient method for PV system Impedance Spectroscopy has been successfully developed and validated.
  • The converter-based IS technique offers a practical alternative to traditional, expensive methods for in situ PV diagnostics.
  • This innovation facilitates broader adoption of advanced characterization techniques in renewable energy research and industry.