Nonlinear backstepping controller design for sharing active and reactive power in three-phase grid-connected photovoltaic systems

T. K. Roy, M. A. Mahmud, M. J. Hossain, A. M T Oo

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

17 Citations (Scopus)

Abstract

In this paper, a nonlinear backstepping controller is designed for three-phase grid-connected solar photovoltaic (PV) systems to share active and reactive power. A cascaded control structure is considered for the purpose of sharing appropriate amount of power. In this cascaded control structure, the dc-link voltage controller is designed for balancing the power flow within the system and the current controller is designed to shape the grid current into a pure sinusoidal waveform. In order to balance the power flow, it is always essential to maintain a constant voltage across the dc-link capacitor for which an incremental conductance (IC) method is used in this paper. This approach also ensures the operation of solar PV arrays at the maximum power point (MPP) under rapidly changing atmospheric conditions. The proposed current controller is designed to guarantee the current injection into the grid in such a way that the system operates at a power factor other than unity which is essential for sharing active and reactive power. The performance of the proposed backstepping approach is verified on a three-phase grid-connected PV system under different atmospheric conditions. Simulation results show the effectiveness of the proposed control scheme in terms of achieving desired control objectives.

Original languageEnglish
Title of host publicationChallenges for Future Grids
Subtitle of host publication2015 Australasian Universities Power Engineering Conference (AUPEC)
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages6
ISBN (Electronic)9781479987252, 9781479987245
ISBN (Print)9781479987269
DOIs
Publication statusPublished - 2015
Externally publishedYes
Event25th Australasian Universities Power Engineering Conference, AUPEC 2015 - Wollongong, Australia
Duration: 27 Sep 201530 Sep 2015

Other

Other25th Australasian Universities Power Engineering Conference, AUPEC 2015
CountryAustralia
CityWollongong
Period27/09/1530/09/15

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