Fractional-Order LCαL Filter-Based Grid Connected PV Systems

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Abstract

this paper introduces a new class of fractional-order LCL (FoLCL) low-pass filters to mitigate current harmonics caused by inverters in grid connected photovoltaic (PV) systems. Usually LCL filters interconnect inverters to utility grids to filter out harmonics produced by inverters. This produces resonance that causes instability to the overall system. A fractional-order capacitor of impedance 1/SαCα is proposed to replace the integer-order capacitor in LCL filter with its fractional-order counterpart to form a LCαL filter. Unlike what is normally used in passive damping, the dynamics of the fractional-order capacitors exhibit intrinsic passive damping effect of fractional-order 0 < α < 1, which can be controlled to minimize heat dissipation due to the embedded passive damper in fractional-order capacitors,.Cα ≡ Cα Besides introducing an intrinsic controllable resistance that depends on LCαL, the filter provides wider bandwidth to mitigate higher order resonance frequencies than its integer-order counterpart. The performance analysis of the proposed filters is verified via numerical simulations.

Original languageBritish English
Title of host publication2019 IEEE 62nd International Midwest Symposium on Circuits and Systems, MWSCAS 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages533-536
Number of pages4
ISBN (Electronic)9781728127880
DOIs
StatePublished - Aug 2019
Event62nd IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2019 - Dallas, United States
Duration: 4 Aug 20197 Aug 2019

Publication series

NameMidwest Symposium on Circuits and Systems
Volume2019-August
ISSN (Print)1548-3746

Conference

Conference62nd IEEE International Midwest Symposium on Circuits and Systems, MWSCAS 2019
Country/TerritoryUnited States
CityDallas
Period4/08/197/08/19

Keywords

  • and resonance damping
  • fractional-order capacitors
  • Grid-connected inverters
  • LCL filter
  • Photovoltaic (PV) systems

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