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Nonlinear current control scheme for a single-phase grid-connected photovoltaic system
journal contribution
posted on 2014-01-01, 00:00 authored by Apel MahmudApel Mahmud, H R Pota, M J HossainThis paper presents a new nonlinear current control scheme for a single-phase grid-connected photovoltaic (PV) system. The controller is designed using partial feedback linearization which linearizes the system partially and enables the controller design scheme for reduced-order PV systems. The reference current is calculated from the maximum power point tracking system. The proposed current control approach introduces the internal dynamics and the stability of the internal dynamics is a key requirement for the implementation of the controller. In this paper, an energy-based Lyapunov function is used to analyze the stability of internal
dynamics of a PV system. The performance of the controller is evaluated based on the tracking of grid current to the reference current by considering the changes in atmospheric conditions. To ensure the suitability of the proposed controller in a real system, a large system similar to a practical system is simulated under different operating conditions such as changes in atmospheric conditions and faults on various parts of the system and compared with conventional controllers. The experimental validation of the proposed control scheme is also presented in this paper.
dynamics of a PV system. The performance of the controller is evaluated based on the tracking of grid current to the reference current by considering the changes in atmospheric conditions. To ensure the suitability of the proposed controller in a real system, a large system similar to a practical system is simulated under different operating conditions such as changes in atmospheric conditions and faults on various parts of the system and compared with conventional controllers. The experimental validation of the proposed control scheme is also presented in this paper.
History
Journal
IEEE Transactions on Sustainable EnergyVolume
5Issue
1Pagination
218 - 227Publisher
Institute of Electrical and Electronics EngineersLocation
United StatesPublisher DOI
ISSN
1949-3029Language
engPublication classification
C Journal article; C1.1 Refereed article in a scholarly journalCopyright notice
2013 IEEEUsage metrics
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Categories
Keywords
Current controllergrid-connected photovoltaic (PV) systemLyapunov functionmaximum power point trackingpartial feedback linearizing controllerScience & TechnologyTechnologyGreen & Sustainable Science & TechnologyEnergy & FuelsEngineering, Electrical & ElectronicScience & Technology - Other TopicsEngineeringSLIDING MODE CONTROLLERTRACKINGALGORITHM