Isolated MMC-based ac/ac stage for ultrafast chargers

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

doi:10.1109/isie45552.2021.9576217

Cited by 17 publications

(33 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The proposed control solution is tested in the MMC topology for UFCSs presented in [6]. In this case, the nominal active power of the UFCS is 3 MW.…”

Section: Ultra-fast Ev Charging Stations Topologymentioning

confidence: 99%

“…Compared to other existing voltage-source converters (VSCs), MMCs are considered more efficient and reliable solutions for high-and medium-power applications; see e.g., [4,5]. These applications include ultra-fast charging stations (UFCSs) of electric vehicles (EVs); see e.g., [6,7]. In this novel application, the MMC should ensure bidirectional power transfer between the grid and the DC bus with lower losses and perturbation to the grid.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Long-Horizon Nonlinear Model Predictive Control of Modular Multilevel Converters

Dreke

Lazăr

2022

Energies

View full text Add to dashboard Cite

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.

show abstract

“…The proposed control solution is tested in the MMC topology for UFCSs presented in [6]. In this case, the nominal active power of the UFCS is 3 MW.…”

Section: Ultra-fast Ev Charging Stations Topologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Long-Horizon Nonlinear Model Predictive Control of Modular Multilevel Converters

Dreke

Lazăr

2022

Energies

View full text Add to dashboard Cite

show abstract

“…The selection of EV charger topology will influence its harmonic current emission directly [7]. Instead of converters with a fixed level number, MMC is extensible and considered as a suitable topology for MV fast chargers to achieve a higher withstanding voltage and operation efficiency [8], [9]. Therefore MMC-based MV fast chargers are mainly focused and grid-tied MMC current injection estimation is intended in this paper.…”

Section: Introductionmentioning

confidence: 99%

Harmonic Current Emission Estimation of Modular Multilevel Converters in MV Charging Stations

Gong

Ćuk

Cobben

2023

IEEE Trans. Power Delivery

View full text Add to dashboard Cite

This paper proposes a novel framework for modular multilevel converter (MMC) current harmonic emission estimation from medium voltage (MV) charging stations. The framework is enlightened by wave decomposition, exploiting an analytical derivation of the emission, without a time-domain model. Accordingly, voltage harmonic distribution in grids can be estimated with a frequency-domain model, using the estimated voltage-dependent current emission in the iterations. Compared to conventional timedomain simulation, such method not only enables analytical harmonic estimation integrated with a large load-flow model, but also benefits from the potential of distributed computation. A 10.5 kV grid-tied single-phase half-bridge MMC simulation case on PLECS has been implemented and investigated for comparison.Corresponding results revealed that the estimated harmonic series kept the absolute average difference to the PLECS model lower than 0.02% and a correlation ratio higher than 99.990% with the simulated ones. The effectiveness of the proposed estimation framework is successfully verified.

show abstract

“…The selection of EV charger topology will influence its harmonic current emission directly [7]. Instead of converters with a fixed level number, MMC is extensible and considered as a suitable topology for MV fast chargers to achieve a higher withstanding voltage and operation efficiency [8], [9]. Therefore MMC-based MV This work was supported by NEON (New Energy and mobility Outlook for the Netherlands, with project number 17628), a cross-over project financed by NWO (the Dutch Research Council).…”

Section: Introductionmentioning

confidence: 99%

Harmonic Current Emission Estimation of Modular Multilevel Converters in MV Charging Stations

Gong¹,

Ćuk²,

Cobben³

2022

Preprint

View full text Add to dashboard Cite

<p>This paper proposes a novel framework for modular multilevel converter (MMC) current harmonic emission estimation from medium voltage (MV) charging stations. The framework is enlightened by wave decomposition, exploiting an analytical derivation of the emission, without a time-domain model. Accordingly, voltage harmonic distribution in grids can be estimated with a frequency-domain model, using the estimated voltage-dependent current emission in the iterations. Compared to conventional time-domain simulation, such method not only enables analytical harmonic estimation integrated with a large load-flow model, but also benefits from the potential of distributed computation. A 10.5kV grid-tied single-phase half-bridge MMC simulation case on PLECS has been implemented and investigated for comparison. Corresponding results revealed that the estimated harmonic series kept the absolute average difference to the PLECS model lower than 0.02% and a correlation ratio higher than 99.79% with the simulated ones. The effectiveness of the proposed estimation framework is successfully verified.</p>

show abstract

Isolated MMC-based ac/ac stage for ultrafast chargers

Cited by 17 publications

References 18 publications

Long-Horizon Nonlinear Model Predictive Control of Modular Multilevel Converters

Long-Horizon Nonlinear Model Predictive Control of Modular Multilevel Converters

Harmonic Current Emission Estimation of Modular Multilevel Converters in MV Charging Stations

Harmonic Current Emission Estimation of Modular Multilevel Converters in MV Charging Stations

Contact Info

Product

Resources

About