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Indexed by:Journal Papers

Date of Publication:2019-11-01

Journal:IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS

Included Journals:SCIE、EI

Volume:66

Issue:11

Page Number:8892-8901

ISSN No.:0278-0046

Key Words:Adaptive quasi-proportional-resonant (AQ-PR) control; robust control strategy; single-phase grid-connected converter; super-twisting sliding mode (ST-SM) control; system perturbations

Abstract:In single-phase grid-connected converters, unexpected perturbations and variations of system parameters can deteriorate the performance of grid current and dc link voltage control and even jeopardize the stability and operation of loads. In this paper, a robust control strategy for the single phase grid-connected converter operating under multiple system perturbations is proposed. An adaptive quasi-proportional-resonant (AQ-PR) controller for the grid current is adopted in combination with an equivalent inductance identification algorithm, which assures that the parameters of the AQ-PR controller can be online calibrated to attain accurate current regulation under ac side inductance uncertainties. A super-twisting sliding mode (ST-SM) controller for the dc-link voltage is proposed to enhance system behavior under both internal and external disturbances. The convergence of the controller is ensured by utilizing Lyapunov theory. Experimental prototype and rigorous tests are presented to validate the feasibility and robustness of the proposed approach under various perturbations.