Decoupled Modulation Scheme for Modular Multilevel Converters in Medium-Voltage Applications

Li, Binbin; Han, Linjie; Mao, Shukai; Zhou, Shaoze; Qu, Zirao; Xu, Dianguo

doi:10.1109/tpel.2020.2983748

Cited by 10 publications

(3 citation statements)

References 26 publications

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“…Secondly, it realizes the high-voltage and high switching frequency multilevel outputs with low-voltage switching devices, which reducing the switching losses. Finally, it also has a common DC bus, which is highly reliable and covers a wide range of power levels [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…The SM capacitor voltage ripple estimation and optimal sizing for MMC was studied in [18], which is suitable for variablespeed drive. Nevertheless, from [18][19][20][21][22][23][24], the operation frequencies are all below 100 Hz; these prior works are suitable for low frequency conditions, and do not take into account high-speed operating conditions with a speed above 10 kr/min. Pan et al [26] developed a SiC-based MMC prototype for high-speed drive, and then, Pan et al [27] presented a new integrated control method for the high-speed MMC drive, where the motor speed reached 15 kr/min.…”

Section: Introductionmentioning

confidence: 99%

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A Discrete-Time Current Control Method for the High-Speed Permanent Magnet Motor Drive Using the Modular Multilevel Converter

Xia,

Peng,

Huang

2024

Symmetry

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High-speed permanent magnet motors (HSPMMs) have received attention in direct drive systems from the industry. Modular multilevel converters (MMCs) have become the most practical solution for HSPMMs in industrial applications due to the advantages of their highly modular structure, high-quality output and high reliability. In this article, the symmetrical discrete-time model of the MMC for the HSPMM drive is presented. Based on this symmetrical discrete-time model, the discrete-time current regulator has been designed. Moreover, the submodel (SM) capacitor energy balance models for MMC have been described, and the energy balance control scheme is introduced. Finally, the simulation and experimental results show that the presented discrete-time current regulator has a strong dynamic response at high speed (15 kr/min), and the SM capacitor voltage balance control is also achieved. Compared with the conventional PI current controller, the proposed discrete-time current regulator improves the current loop dynamic performance at high-speed, and the energy balance control scheme can ensure the SM capacitor voltage balance of the MMC.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Discrete-Time Current Control Method for the High-Speed Permanent Magnet Motor Drive Using the Modular Multilevel Converter

Xia,

Peng,

Huang

2024

Symmetry

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“…T he modular multilevel converter (MMC) has been attracting the interest of the industrial community in the past decades due to its easy scalability to higher voltages, standardized components assembly, superior efficiency and inherent redundancy [1]. In low and medium voltage operations, the converter can be employed in several scenarios such as AC motor drives [2], in STATCOM applications [3], microgrids [4] and electric vehicles [5].…”

Section: Introductionmentioning

confidence: 99%

On the Roles and Interactions of the MMC Internal Energy Balancing Degrees of Freedom for Three-Wire Three-Phase Connections

Spier

Prieto‐Araujo

Lopez-Mestre³

et al. 2023

IEEE Trans. Power Delivery

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This paper proposes a comprehensive analysis of the Modular Multilevel Converter (MMC) focusing on the different arm applied voltage components, that this paper will refer as degrees of freedom (DOFs), which must be considered in order to perform the internal energy balancing of the converter. The analysis relies on the commonly used differential and additive reference frames. By means of a steady-state analysis, the different voltages components applied and currents components flowing through the converter are studied and an in-depth discussion of the roles of each DOF in the converter is presented. Furthermore, the mathematical expressions of the power exchanged between the AC/DC networks and within the converter, between the arms (vertical) and among phase-legs (horizontal), are derived considering all the DOFs of the MMC, revealing potential interactions among the differential and additive quantities. Finally, the theoretical analysis is validated through comparisons between the values obtained with the mathematical expressions and the simulation results assuming different case scenarios.

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Optimal Modulation Method for Modular Multilevel Converters in Medium-voltage DC Distribution Networks

Zhu

Chen

Xue

et al. 2022

2022 IEEE 5th International Conference on Automation, Electronics and Electrical Engineering (AUTEEE)

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Decoupled Modulation Scheme for Modular Multilevel Converters in Medium-Voltage Applications

Cited by 10 publications

References 26 publications

A Discrete-Time Current Control Method for the High-Speed Permanent Magnet Motor Drive Using the Modular Multilevel Converter

A Discrete-Time Current Control Method for the High-Speed Permanent Magnet Motor Drive Using the Modular Multilevel Converter

On the Roles and Interactions of the MMC Internal Energy Balancing Degrees of Freedom for Three-Wire Three-Phase Connections

Optimal Modulation Method for Modular Multilevel Converters in Medium-voltage DC Distribution Networks

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