Extended operating region of modular multilevel converters using full-bridge sub-modules

Marca, Ygor Pereira; Duarte, J.L.; Roes, M. G. L.; Wijnands, Korneel

doi:10.23919/epe21ecceeurope50061.2021.9570628

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2024

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Cited by 2 publications

References 14 publications

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Multivariable control of ac/ac modular multilevel converters under square wave operation using Fourier expansion

Reyes Dreke,

Pereira Marca,

Pouresmaeil

et al. 2024

2024 IEEE 21st International Power Electronics and Motion Control Conference (PEMC)

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Multivariable control of ac/ac modular multilevel converters under square wave operation using Fourier expansion

Reyes Dreke,

Pereira Marca,

Pouresmaeil

et al. 2024

2024 IEEE 21st International Power Electronics and Motion Control Conference (PEMC)

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Long-Horizon Nonlinear Model Predictive Control of Modular Multilevel Converters

Dreke

Lazăr

2022

Energies

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Modular Multilevel Converters (MMCs) are a topology that can scale several voltage levels to obtain higher efficiency and lower harmonics than most voltage-source converters. MMCs are very attractive for renewable energy applications and fast charging stations for electric vehicles, where they can improve performance and reduce costs. However, due to the complex architecture and the large number of submodules, the current control of modular multilevel converters is a challenging task. The standard solution in practice relies on hierarchical decoupling and single-input-single-output control loops, which are limited in performance. Linearization-based model predictive control was already proposed for current control in MMCs, as it can optimize transient response and better handle constraints. In this paper, we show that the validity of linear MMC models significantly limits the prediction horizon length, and we propose a nonlinear MPC (NMPC) solution for current control in MMCs to solve this issue. With NMPC, we can employ long prediction horizons up to 100 compared to a horizon of 10, which is the limit for the prediction range of a linear MMC model. Additionally, we propose an alternative MMC prediction model and corresponding cost function, which enables directly controlling the circulating current and improves the capacitor voltages’ behavior. Using the state-of-the-art in sequential quadratic programming for NMPC, we show that the developed NMPC algorithm can meet the real-time constraints of MMCs. A performance comparison with a time-varying linearization-based MPC for an MMC topology used in ultra-fast charging stations for electric vehicles illustrates the benefits of the developed approach.

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Extended operating region of modular multilevel converters using full-bridge sub-modules

Abstract: Extended operating region of modular multilevel converters using full-bridge sub-modules.

Cited by 2 publications

References 14 publications

Multivariable control of ac/ac modular multilevel converters under square wave operation using Fourier expansion

Multivariable control of ac/ac modular multilevel converters under square wave operation using Fourier expansion

Long-Horizon Nonlinear Model Predictive Control of Modular Multilevel Converters

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