Fast multistep finite control set model predictive control for transient operation of power converters

Baidya, Roky; Aguilera, Ricardo P.; Acuna, Pablo; Delgado, Ramón A.; Geyer, Tobias; Quevedo, Daniel E.; Mouton, Toit

doi:10.1109/iecon.2016.7793404

Cited by 17 publications

(4 citation statements)

References 24 publications

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“…2, U sq =Ũ opt and thus, δ sq = 0. On the contrary, U eg is generally far from U opt (k) in the transformed space during transients, since it depends on the previous optimal solution U opt (k − 1) as per (12). Comparing these two control input sequences during transients, it can be said that δ sq δ eg .…”

Section: : Else 18mentioning

confidence: 99%

“…Subsequently, a deterministic use of multistep MPC under several drive system conditions has been evaluated in a three-level induction machine drive switching at 350 Hz [14]. The paper at hand extends the work in [12] by considering a generic control formulation for a power converter system (modeled as a linear system with quantized inputs), a detailed computational analysis, and a geometric optimality interpretation. Moreover, a grid-connected three-phase three-level H-Bridge (HB) converter as a case study is presented with the processor-inthe-loop (PIL) simulations for performance evaluation with different prediction horizons, and an optimality analysis with experimental verifications.…”

Section: Introductionmentioning

confidence: 97%

“…The previously discussed idea of obtaining a new initial sphere center to address the computational burden of SDA during transients was originally proposed in the preliminary work [12]. Afterwards, this idea has been adopted in [13] for a multistep MPC formulated as in [10], with simulations results on a variable speed drive system.…”

Section: Introductionmentioning

confidence: 99%

“…Citation information: DOI 10.1109/OJIES.2020.3029358, IEEE Open Journal of the Industrial Electronics Society : function [Θ, U ini , ρ ini ] = INITIALIZE(C H ) 2: Compute U uc as in (9) 3: if U uc ∈ C H then 4:Θ ←Ū uc = HU uc and U ini ← U eg as in(12) 5: else when U uc / ∈ C H…”

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confidence: 99%

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Enabling Multistep Model Predictive Control for Transient Operation of Power Converters

Baidya

Aguilera

Acuna

et al. 2020

IEEE Open J. Ind. Electron. Soc.

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Recently, an efficient multistep direct model predictive control (MPC) scheme for power converters has been proposed. It relies on the Sphere Decoding Algorithm (SDA) to solve the associated longhorizon optimal control problem. Since the SDA evaluates only a small number of candidate solutions to find the optimal one, a significant reduction in the average computational burden can be achieved compared to the basic exhaustive search approach. However, this is only true during steady-state operation. In fact, the SDA still requires a large execution time during transients. This paper shows that if not properly addressed, the dynamic performance of the system may be degraded, which clearly limits its practical application. To mitigate this issue, which particularly arises during transients, an efficient preconditioning approach for the SDA is proposed. This approach ensures that only a small number of candidate solutions are evaluated during both steady-state and transients. This allows the multistep direct MPC to become a viable control alternative for power converters operating at low semiconductor switching frequencies, e.g., below 450 Hz. The proposal is validated using a grid-connected three-level converter as a case study. Both processor-in-the-loop simulations and experimental results on a scaled-down 2.24 kVA laboratory setup are presented. INDEX TERMS Model predictive control, Integer least squares problem, Sphere decoding algorithm, Convex hull, Quadratic programming solver, Power converters.

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Section: : Else 18mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%