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Characterisation of Harmonic Resonance Phenomenon of Multi-Parallel PV Inverter Systems: Modelling and Analysis

Author

Listed:
  • Kasun Peiris

    (Australian Power Quality Research Centre, University of Wollongong, Wollongong, NSW 2522, Australia)

  • Sean Elphick

    (Australian Power Quality Research Centre, University of Wollongong, Wollongong, NSW 2522, Australia)

  • Jason David

    (Australian Power Quality Research Centre, University of Wollongong, Wollongong, NSW 2522, Australia)

  • Duane Robinson

    (Australian Power Quality Research Centre, University of Wollongong, Wollongong, NSW 2522, Australia)

Abstract

Solar PV inverters require output filters to reduce unwanted harmonics in their output, where LCL filters are a more economical choice than larger inductance-only filters. A drawback of these filters is that they can introduce power quality disturbances, especially at higher frequencies (above 2 kHz). This paper investigates and characterises the resonance phenomenon introduced by different filter types, i.e., LC or LCL, and identifies their behavioural change when combined with multiple parallel grid-tied PV inverter systems. MATLAB/Simulink modelling aspects of PV inverter systems related to resonance phenomenon are presented, including establishing resonance at a specific frequency where potentially large variations in the parameter selection across manufacturers may exist. In addition, a method is developed to establish output filter frequency response through measurements, which is used to develop validated solar PV harmonic models for high-frequency analysis. The low-frequency harmonic models can be used up to the resonant frequency where the current flowing through the filter capacitor is insignificant compared to the current flowing into the electricity network.

Suggested Citation

  • Kasun Peiris & Sean Elphick & Jason David & Duane Robinson, 2025. "Characterisation of Harmonic Resonance Phenomenon of Multi-Parallel PV Inverter Systems: Modelling and Analysis," Energies, MDPI, vol. 18(2), pages 1-23, January.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:2:p:443-:d:1571863
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