Dynamic Performance Evaluation and Optimization of Common HFAC Bus Lightweight MMC-SST

Bu, Zemin; Zhao, Wei; Zhang, Min; Teng, Jiaxun; Li, Xin; Sun, Xiaofeng

doi:10.1109/tpel.2023.3326288

Cited by 4 publications

(2 citation statements)

References 38 publications

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“…In addition, in [18][19][20] and in [10,[21][22][23][24][25][26][27], the MMC converts a single-phase and a three-phase MV grid, respectively, into a square wave mediumfrequency voltage. Furthermore, in [28][29][30][31], the MMC submodules directly connect to multiple medium-frequency transformers and ac/dc converters, and the MMC legs connect to a dc bus voltage. However, the MMC with a single-phase ac and a dc bus voltage port, as in [26][27][28][29][30][31], is not needed in this application.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, in [28][29][30][31], the MMC submodules directly connect to multiple medium-frequency transformers and ac/dc converters, and the MMC legs connect to a dc bus voltage. However, the MMC with a single-phase ac and a dc bus voltage port, as in [26][27][28][29][30][31], is not needed in this application. Therefore, the proposed ultrafast charger in Figure 1b implements a three-phase to single-phase ac/ac MMC with FB SMs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Single-Stage MV-Connected Charger Using an Ac/Ac Modular Multilevel Converter

Marca,

Roes,

Wijnands

et al. 2024

Energies

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Modular multilevel converters with non-sinusoidal ac voltage output can reduce cost and volume in medium-voltage-connected electric vehicle battery charging applications. The use of full-bridge submodules in such converters enables single-stage ac/ac voltage conversion, allowing a medium-voltage grid to be directly connected to a medium-frequency isolation transformer. The application of a square wave voltage at the medium-frequency transformer’s single-phase port enhances the converter’s efficiency and power density in comparison to a sinusoidal voltage. This paper presents the analysis and modelling of a modular multilevel converter, comparing its operation with sinusoidal and square wave output voltages. A single control scheme for both output voltage waveforms is proposed for the three-phase and single-phase ac currents, circulating currents, and the energy stored in the submodule capacitors. The control strategy of the three-phase and single-phase port currents is verified through simulation and experiments using a scaled-down prototype, thereby validating its suitability for high-power bidirectional battery chargers.

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