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Energies 2018, 11(9), 2456; https://doi.org/10.3390/en11092456

An Analysis of Frequency Variations and its Implications on Connected Equipment for a Nanogrid during Islanded Operation

Electric Power Engineering, Luleå University of Technology, 931 87 Skellefteå, Sweden
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Received: 29 July 2018 / Revised: 9 September 2018 / Accepted: 12 September 2018 / Published: 16 September 2018
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Abstract

Frequency, voltage and reliability data have been collected in a nanogrid for 48 weeks during islanded operation. Frequency values from the 48 week measurements were analyzed and compared to relevant limits. During 19.5% of the 48 weeks, the nanogrid had curtailed the production due to insufficient consumption in islanded operation. The curtailment of production was also the main cause of the frequency variations above the limits. When the microgrid operated on stored battery power, the frequency variations were less than in the Swedish national grid. 39.4% of all the interruptions that occurred in the nanogrid are also indirectly caused by the curtailment of solar production. Possible solutions for mitigating the frequency variations and lowering the number of interruptions are also discussed. View Full-Text
Keywords: frequency variations; islanded operation; nanogrids; power quality; power system reliability frequency variations; islanded operation; nanogrids; power quality; power system reliability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Nömm, J.; Rönnberg, S.K.; Bollen, M.H.J. An Analysis of Frequency Variations and its Implications on Connected Equipment for a Nanogrid during Islanded Operation. Energies 2018, 11, 2456.

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