Mitigation of Harmonics in Grid-Connected and Islanded Microgrids via Virtual Admittances and Impedances

Alexander Micallef, Maurice Apap, Cyril Spiteri-Staines, Josep M. Guerrero

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

134 Citationer (Scopus)
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Abstract

Optimization of the islanded and grid-connected operation of microgrids is important to achieve a high degree of reliability. In this paper, the authors consider the effect of current harmonics in single phase microgrids during both modes of operation. A detailed analysis of the effect of the output impedance of the considered primary control loops on the harmonic output of the considered voltage source inverters is initially carried out. A virtual admittance loop is proposed to attenuate the current harmonic output in grid-connected operation that is generated due to the grid voltage distortion present at the point of common coupling (PCC) and due to local non-linear loads. This paper also considers the harmonic current sharing and resulting voltage harmonics at the PCC during islanded operation of the microgrid. A capacitive virtual impedance loop was implemented to improve the harmonic current sharing and attenuate the voltage harmonics at the PCC. Experimental results are given to validate the operation of the proposed algorithms.
OriginalsprogEngelsk
TidsskriftI E E E Transactions on Smart Grid
Vol/bind8
Udgave nummer2
Sider (fra-til)651 - 661
Antal sider11
ISSN1949-3053
DOI
StatusUdgivet - mar. 2017

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