Common High-Frequency Bus-Based Cascaded Multilevel Solid-State Transformer With Ripple and Unbalance Power Decoupling Channel

Teng, Jiaxun; Bu, Zemin; Sun, Xiaofeng; Fu, Huanshuai; Zhao, Wei; Li, Xin

doi:10.1109/tpel.2022.3153367

Cited by 8 publications

(2 citation statements)

References 50 publications

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“…The structure in Fig. 2(c) has the full modularity aspect and a common DC-link for the system [6], [7], [8], [9]. This structure consists of a modular multilevel converter (MMC) as the AC/DC conversion between the MVAC and MVDC as well as DC/DC converters connected to each MMC submodule capacitor to construct the LVDC port.…”

Section: Introductionmentioning

confidence: 99%

Submodule Capacitor Voltage Balancing Through High-Frequency-Side Control for Multiport MMC-Based Solid-State Transformers

Budiwicaksana,

Lee

2024

IEEE Open J. Ind. Electron. Soc.

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This paper proposes a novel submodule capacitor voltage balancing control for multiport modular multilevel converter (MMC)-based solid-state transformers (SSTs). To balance each submodule capacitor voltage, the balancing control is usually applied to the MMC. However, the low switching frequency operation and bulky arm inductance of the MMC limit the controller bandwidth and stability margin. These issues are addressed by moving the balancing control to the back-end DC/DC converter which is operated at high switching frequency. The controller gains are designed based on the small-signal model. The superiority of the proposed controller over the conventional one has been verified through Bode plot, pole-zero map, and Nyquist path analyses. Experimental results for a 2.4 kW prototype system have also verified the accuracy of the model and effectiveness of the proposed balancing control for step load changes.INDEX TERMS Balancing control, modeling, modular multilevel converters, solid-state transformer. FIGURE 1. Basic structure and application of a multiport SST.

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Section: Introductionmentioning

confidence: 99%

Submodule Capacitor Voltage Balancing Through High-Frequency-Side Control for Multiport MMC-Based Solid-State Transformers

Budiwicaksana,

Lee

2024

IEEE Open J. Ind. Electron. Soc.

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“…MMC-based ac/ac converters can be broadly categorized into two subgroups: (i) direct ac/ac converters such as modular multilevel matrix converters (M3Cs) [14]- [16] and hexverters [17], and (ii) indirect ac/ac converters including back-to-back MMC (BTB-MMC) [18]- [21] and MMC based solid-state transformer (MMC-SST) [22]- [24]. The direct ac/ac MMCs typically use full-bridge submodules to support power conversion directly between two different ac frequencies, without a main dc link.…”

Section: Introductionmentioning

confidence: 99%

A New Class of Modular Multilevel Converter for Direct AC-AC Conversion

Wijesekera,

Li,

Kish

2023

IEEE Open J. Power Electron.

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This article introduces the modular multilevel ac/ac converter (M2AC) which capitalizes on a new partial power processing mechanism (P3M) to achieve direct voltage transformation in single frequency power systems. The proposed P3M allows direct voltage transformation using only half-bridge submodules (HBSM) by harnessing internally circulating dc currents to achieve the charge balance of the submodule capacitors. The M2AC represents a new class of modular multilevel converter (MMC) where, unlike with the classical back-to-back MMC, all submodules contribute to net ac power transfer. When contrasting this single-stage ac/ac conversion process with the ac/dc-dc/ac conversion process for the back-to-back MMC, the M2AC is shown to have a significantly lower semiconductor effort requirement. The article begins by using the classical dc-ac MMC structure to motivate the derivation of the M2AC. A detailed analysis of the M2AC's fundamental working principle is conducted with emphasis on the P3M. A dynamic controller is proposed that incorporates key functionalities such as output voltage regulation and submodule capacitor voltage balancing controls. The M2AC's principle of operation and the proposed controls are validated by simulation studies, and experimental tests performed on a laboratory-scale 250 Vpk, 1.25 kW prototype further confirm the efficacy of the novel P3M. The M2AC offers a new approach to voltage conversion in ac power systems that may be an attractive solution for certain distribution and transmission level applications, primarily where voltage regulation and power flow control are core objectives.INDEX TERMS Modular multilevel converter, direct ac/ac conversion, partial power processing.

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A Lightweight Cascaded Mutilevel Solid State Transformer Scheme Based on Ripple-Power Decoupling Channel

Teng

Zhao

et al. 2022

2022 4th International Conference on Smart Power &Amp; Internet Energy Systems (SPIES)

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Common High-Frequency Bus-Based Cascaded Multilevel Solid-State Transformer With Ripple and Unbalance Power Decoupling Channel

Cited by 8 publications

References 50 publications

Submodule Capacitor Voltage Balancing Through High-Frequency-Side Control for Multiport MMC-Based Solid-State Transformers

Submodule Capacitor Voltage Balancing Through High-Frequency-Side Control for Multiport MMC-Based Solid-State Transformers

A New Class of Modular Multilevel Converter for Direct AC-AC Conversion

A Lightweight Cascaded Mutilevel Solid State Transformer Scheme Based on Ripple-Power Decoupling Channel

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