Enhancement on capacitor-voltage-balancing capability of a modular multilevel cascade inverter for medium-voltage synchronous-motor drives

Okazaki, Yuji; Matsui, Hitoshi; Muhoro, M. Moses; Hagiwara, Makoto; Akagi, Hirofumi

doi:10.1109/ecce.2015.7310550

Cited by 8 publications

(6 citation statements)

References 23 publications

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“…4). This is certainly an advantage over previous works (see [14], [16], [22]), where a transition zone with relatively large circulating currents is typically produced, degrading the converter efficiency.…”

Section: A Vector Control Of V ∆ Cαβmentioning

confidence: 80%

“…An additional difference to recent approaches reported in the literature [14], [16], [22], is that the proposed control system uses software-implemented switches to achieve a fast transition between the operating modes, avoiding the use of weighting factors to change the control system from the low-frequency to the high-frequency modes. In this work a seamless transition is possible because the circulating currents become null at the end of the LFM (see Fig.…”

Section: A Vector Control Of V ∆ Cαβmentioning

confidence: 93%

“…8, which is based on (5). Moreover, the proportional part of the controllers can regulate other components in i Σ dq , even in the HFM [22]. At the output of the controller, the inverse dq-and Σ∆αβ0-transformations are applied to the desired output cluster voltages in Σ∆αβ0-coordinates to obtain V P N * abc .…”

Section: Circulating Current Controller and Signal Generatormentioning

confidence: 99%

“…8) to determinate the transistor gate signals. In this work, the cell balancing algorithm presented in [22] and the machine control system discussed in [23] are used.…”

Section: Circulating Current Controller and Signal Generatormentioning

confidence: 99%

See 3 more Smart Citations

An Integrated Converter and Machine Control System for MMC-Based High-Power Drives

Espinoza-B.

Cárdenas

Clare

et al. 2019

IEEE Trans. Ind. Electron.

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Section: A Vector Control Of V ∆ Cαβmentioning

confidence: 80%

Section: A Vector Control Of V ∆ Cαβmentioning

confidence: 93%

Section: Circulating Current Controller and Signal Generatormentioning

confidence: 99%

“…8) to determinate the transistor gate signals. In this work, the cell balancing algorithm presented in [22] and the machine control system discussed in [23] are used.…”

Section: Circulating Current Controller and Signal Generatormentioning

confidence: 99%

See 2 more Smart Citations

An Integrated Converter and Machine Control System for MMC-Based High-Power Drives

Espinoza-B.

Cárdenas

Clare

et al. 2019

IEEE Trans. Ind. Electron.

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show abstract

“…These voltages are referred to the P N abc frame using the inverse Σ∆αβ0 transformation in order to be processed by the cell balancing algorithm (see [26]). In this work the angle θ e is the rotor-flux angle of the vector controlled induction machine.…”

Section: B Analysis Of the System Using The Vp V Model For Lfmmentioning

confidence: 99%

An Enhanced $dq$-Based Vector Control System for Modular Multilevel Converters Feeding Variable-Speed Drives

Espinoza

Cárdenas

Díaz

et al. 2017

IEEE Trans. Ind. Electron.

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Abstract-Modular Multilevel Converters (M 2 C) are considered an attractive solution for high power drive applications. However, energy balancing within the converter is complex to achieve, particularly when the machine is operating at low rotational speeds. In this paper a new control system, based on cascaded control loops and a vector-power-voltage (vP V ) model of the M 2 C, is proposed. The control system is implemented in a dq-synchronous frame rotating at ωe rad/s with the external loop regulating the capacitor voltages using PI controllers. The internal loop controls the converter currents using PI and resonant controllers. In addition the control systems required to operate the machine at other points, i.e. at medium and high rotational speeds, are also discussed in this work. Experimental results obtained with a M 2 C-based drive laboratory prototype with eighteen power cells are presented in this paper.Index Terms-Modular Multilevel Converter, variable speed drives, low-frequency operation, voltage balancing.

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Review on low‐frequency ripple suppression methods for MMCs for medium‐voltage drive applications

Wang

Chen

Liao

et al. 2018

IET Power Electronics

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Advantages of the modular multilevel converter (MMC) such as modularity, scalability, fault-tolerant ability, low device switching frequency, transformerless grid connection etc. have made it the most promising converter topology for medium-tohigh-voltage, high-power applications. However, in MMC-based medium-voltage drives, the excessive fundamental-frequency submodule capacitor voltage ripple at low speeds or start-up poses a major technological challenge. A lot of low-frequency ripple suppression methods have been proposed to address this problem. This study summarises the state of the art in this area and classifies these methods into three categories. The pros and cons of them are discussed. An in-depth analysis of these methods from a practical viewpoint is given. Some future research trends are also discussed.

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Enhancement on capacitor-voltage-balancing capability of a modular multilevel cascade inverter for medium-voltage synchronous-motor drives

Cited by 8 publications

References 23 publications

An Integrated Converter and Machine Control System for MMC-Based High-Power Drives

An Integrated Converter and Machine Control System for MMC-Based High-Power Drives

An Enhanced $dq$-Based Vector Control System for Modular Multilevel Converters Feeding Variable-Speed Drives

Review on low‐frequency ripple suppression methods for MMCs for medium‐voltage drive applications

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