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Robust Control Strategy Design for Single-Phase Grid-Connected Converters Under System Perturbations | IEEE Journals & Magazine | IEEE Xplore

Robust Control Strategy Design for Single-Phase Grid-Connected Converters Under 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 voltag...Show More

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.
Published in: IEEE Transactions on Industrial Electronics ( Volume: 66, Issue: 11, November 2019)
Page(s): 8892 - 8901
Date of Publication: 08 March 2019

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