Evaluation of Medium Voltage Network for Propagation of Supraharmonics Resonance

Shimi Sudha Letha, Angela Espin Delgado, Sarah K. Rönnberg and Math H. J. Bollen
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Shimi Sudha Letha: Department of Engineering Sciences and Mathematics, Luleå University of Technology, 931 87 Skellefteå, Sweden
Angela Espin Delgado: Department of Engineering Sciences and Mathematics, Luleå University of Technology, 931 87 Skellefteå, Sweden
Sarah K. Rönnberg: Department of Engineering Sciences and Mathematics, Luleå University of Technology, 931 87 Skellefteå, Sweden
Math H. J. Bollen: Department of Engineering Sciences and Mathematics, Luleå University of Technology, 931 87 Skellefteå, Sweden

Energies, 2021, vol. 14, issue 4, 1-17

Abstract: Power converters with high switching frequency used to integrate renewable power sources to medium and low voltage networks are sources of emission in the supraharmonic range (2 to 150 kHz). When such converters are connected to a medium voltage (MV) network these supraharmonics propagate through the MV network and can impact network and customer equipment over a wide range. This paper evaluates an existing Swedish MV electrical network and studies the pattern of supraharmonic resonance and the propagation of supraharmonics. The MV network consists of eight feeders including a small wind farm. Simulations reveal that, the bigger the MV network, the more resonant frequencies, but also the lower the amplitude of the resonance peaks in the driving point impedance. It was also identified that for short feeders as length increases, the magnitude of the transfer impedance at supraharmonic frequency decreases. For further increment in feeder length, the magnitude increases or becomes almost constant. For very long feeders, the transfer impedance further starts decreasing. The eight feeders in the network under study are similar but show completely different impedance versus frequency characteristics. Measurements at the MV side of the wind farm show time varying emissions in the supraharmonic range during low power production. The impact of these emissions coupled with system resonance is examined.

Keywords: supraharmonics; power-system harmonics; power quality; electric power distribution; power-system modelling (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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