A Hierarchical Control Scheme for Reactive Power and Harmonic Current Sharing in Islanded Microgrids

Iman Lorzadeh, Mehdi Savaghebi Firoozabadi, Hossein Askarian Abyaneh, Josep M. Guerrero

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

6 Citations (Scopus)
484 Downloads (Pure)

Abstract

In this paper, a hierarchical control scheme consisting of primary and secondary levels is proposed for achieving accurate reactive power and harmonic currents sharing among interface inverters of distributed generators (DGs) in islanded microgrids. Firstly, fundamental and main harmonic components of each inverter output current are extracted at primary level and transmitted to the secondary controller. Then, instantaneous circulating currents at different frequencies are calculated and applied by the secondary level to generate proper control signals for accurate reactive power and harmonic current sharing among the inverters. Consequently, these signals are sent to the primary level and inserted as voltage references after passing the control blocks. In contrast to the conventional virtual impedance schemes, where reactive power and harmonic current sharing are realized at the expense of introducing additional voltage drop and distortion, the proposed control strategy effect on the amplitude and waveform quality of DGs’ voltage is negligible. Meanwhile, it is able to provide accurate harmonic current sharing even if nonlinear loads are directly connected at the terminal of DG units. Control system design is described in detail and simulation results are provided to demonstrate the effectiveness of the proposed control method.
Original languageEnglish
Title of host publicationProceedings of the 17th Conference on Power Electronics and Applications, EPE’15-ECCE Europe
Number of pages10
PublisherIEEE Press
Publication dateSep 2015
Pages1-10
DOIs
Publication statusPublished - Sep 2015
Event17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015 - Centre International de Conférence Genève (CICG), 17 rue Varembé CH . 1211 Genève 20, Geneva, Switzerland
Duration: 8 Sep 201510 Sep 2015

Conference

Conference17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015
LocationCentre International de Conférence Genève (CICG), 17 rue Varembé CH . 1211 Genève 20
CountrySwitzerland
CityGeneva
Period08/09/201510/09/2015

Keywords

  • Islanded microgrid
  • Harmonic currents sharing
  • Reactive power sharing
  • Instantaneous circulating currents
  • Hierarchical control

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    Lorzadeh, I., Firoozabadi, M. S., Askarian Abyaneh, H., & Guerrero, J. M. (2015). A Hierarchical Control Scheme for Reactive Power and Harmonic Current Sharing in Islanded Microgrids. In Proceedings of the 17th Conference on Power Electronics and Applications, EPE’15-ECCE Europe (pp. 1-10). IEEE Press. https://doi.org/10.1109/EPE.2015.7311770