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

Jakob Nömm, Sarah K. Rönnberg and Math H. J. Bollen
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Jakob Nömm: Electric Power Engineering, Luleå University of Technology, 931 87 Skellefteå, Sweden
Sarah K. Rönnberg: Electric Power Engineering, Luleå University of Technology, 931 87 Skellefteå, Sweden
Math H. J. Bollen: Electric Power Engineering, Luleå University of Technology, 931 87 Skellefteå, Sweden

Energies, 2018, vol. 11, issue 9, 1-13

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.

Keywords: frequency variations; islanded operation; nanogrids; power quality; power system reliability (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: 2018
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