Impact of Multiple Grid-Connected Solar PV Inverters on Harmonics in the High-Frequency Range

Kasun Peiris, Sean Elphick, Jason David and Duane Robinson ()
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Kasun Peiris: Australian Power Quality Research Centre, University of Wollongong, Wollongong 2522, Australia
Sean Elphick: Australian Power Quality Research Centre, University of Wollongong, Wollongong 2522, Australia
Jason David: Australian Power Quality Research Centre, University of Wollongong, Wollongong 2522, Australia
Duane Robinson: Australian Power Quality Research Centre, University of Wollongong, Wollongong 2522, Australia

Energies, 2024, vol. 17, issue 11, 1-13

Abstract: In recent years, integration of solar photovoltaic (PV) systems into distribution networks has been increasing rapidly, as it has become the most promising renewable energy source (RES) in the transition of power generation from centralised to decentralised systems. With the power electronic (PE) interfaces that use high-frequency internal switching, all renewable energy sources are considered to be harmonic emitters, especially near switching frequencies, i.e., above 2 kHz. This paper evaluates the behaviour of high-frequency harmonics in the 2–20 kHz range due to the parallel operation of multiple solar PV inverters connected to a low-voltage (LV) network. The circulation current component that flows within the installation due to the low impedance paths at higher frequencies is analysed. Summation of high-frequency harmonic currents is observed with phase diversity analysis. The circulating current component can become 14 times higher than the grid current component at higher frequencies.

Keywords: power quality; harmonic; solar PV system; rooftop solar; high-frequency harmonics; supraharmonic; resonance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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