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Open AccessArticle

Multi-Objective Optimisation-Based Tuning of Two Second-Order Sliding-Mode Controller Variants for DFIGs Connected to Non-Ideal Grid Voltage

1
Department of Automatic Control and Systems Engineering, Faculty of Engineering, Gipuzkoa, University of the Basque Country UPV/EHU, Plaza de Europa 1, 20018 Donostia, Spain
2
Instituto Universitario de Automática e Informática Industrial (ai2), Universitat Politècnica de València, Camí de Vera s/n, 46022 València, Spain
*
Author to whom correspondence should be addressed.
Energies 2019, 12(19), 3782; https://doi.org/10.3390/en12193782
Received: 15 August 2019 / Revised: 27 September 2019 / Accepted: 28 September 2019 / Published: 5 October 2019
(This article belongs to the Special Issue Sliding Mode Control of Power Converters in Renewable Energy Systems)
In this paper, a posteriori multi-objective optimisation (MOO) is applied to tune the parameters of a second-order sliding-mode control (2-SMC) scheme commanding the grid-side converter (GSC) of a doubly-fed induction generator (DFIG) subject to unbalanced and harmonically distorted grid voltage. Two variants (i.e., design concepts) of the same 2-SMC algorithm are assessed, which only differ in the format of their switching functions and which contain six and four parameters to be adjusted, respectively. A single set of parameters which stays valid for nine different operating regimes of the DFIG is also sought. As two objectives, related to control performances of grid active and reactive powers, are established for each operating regime, the optimisation process considers 18 objectives simultaneously. A six-parameter set derived in a previous work without applying MOO is taken as reference solution. MOO results reveal that both the six- and four-parameter versions can be tuned to overcome said reference solution in each and every objective, as well as showing that performances comparable to those of the six-parameter variant can be achieved by adopting the four-parameter one. Overall, the experimental results confirm the latter and prove that the performance of the reference parameter set can be significantly improved by using either of the six- or four-parameter versions. View Full-Text
Keywords: decision making; design concept; doubly-fed induction generator; grid-side converter; harmonic distortion; multi-objective optimisation; second-order sliding-mode control; tuning; unbalanced voltage; wind power generation decision making; design concept; doubly-fed induction generator; grid-side converter; harmonic distortion; multi-objective optimisation; second-order sliding-mode control; tuning; unbalanced voltage; wind power generation
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Susperregui, A.; Herrero, J.M.; Martinez, M.I.; Tapia-Otaegui, G.; Blasco, X. Multi-Objective Optimisation-Based Tuning of Two Second-Order Sliding-Mode Controller Variants for DFIGs Connected to Non-Ideal Grid Voltage. Energies 2019, 12, 3782.

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