Low-Frequency Scheduler for Optimal Conduction Loss in Series/Parallel Modular Multilevel Converters

Tashakor, Nima; Iraji, Farzad; Goetz, Stefan

doi:10.1109/tpel.2021.3110213

Cited by 24 publications

(3 citation statements)

References 63 publications

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“…7) [50], [51]. SMs with four terminals are used in MMSPC arms, such as the double-H-bridge SMs [50], asymmetrical/symmetrical double-halfbridge SMs [52], [53], three-switch SMs [54], [55] [see Fig. 7(a)-(d)], and each SM connects to its adjacent SM through two output terminals [51].…”

Section: ) Mmspcmentioning

confidence: 99%

Beyond the MMC: Extended Modular Multilevel Converter Topologies and Applications

Sun

Tian

Pou

et al. 2022

IEEE Open J. Power Electron.

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The unique advantages of modular multilevel converters (MMCs) have led to wide adoption of the converter topology in high voltage dc (HVDC) transmission systems, with great potential for use in medium voltage motor drive and dc grid applications. Inspired by the structure of the MMC, many extended converter topologies have been developed in the literature. These include, in addition to conventional parallel multiphase connection, a variety of series-connected topologies. Extended MMCs integrate the modular nature of cascaded SMs of the MMC but with different topology structure leading to substantially different operating principles. Given the growing number of such topologies, this paper provides a critical review of MMC derived topologies and summarizes individual advantages and disadvantages. The control schemes * : Common characteristics and advantages/disadvantages of the whole category.

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Section: ) Mmspcmentioning

confidence: 99%

Beyond the MMC: Extended Modular Multilevel Converter Topologies and Applications

Sun

Tian

Pou

et al. 2022

IEEE Open J. Power Electron.

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“…The main advantage is that it has improved waveform quality, low dv/dt, low output voltage total harmonic distortion (THD), and reduced cost of the converter [1][2][3][4][5]. The most widely used conventional multilevel converters are neutral-point-clamped (NPC) inverter, floating capacitor (FC) inverter, and cascaded H-bridge (CHB) inverter [6][7][8]. As a mature topology, the three-level neutral-point clamped converter shows the advantages in medium-voltage applications [9].…”

Section: Introductionmentioning

confidence: 99%

An optimization method for reducing the voltage fluctuation of the floating‐capacitor in ANPC five‐level inverter

Lu³

et al. 2023

IET Power Electronics

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The excessive fluctuation of the floating capacitance's (FCs) voltage affects the output performance and output power of the 3P‐5L‐ANPC converter. In order to minimize the fluctuation of the FCs voltage, an optimization control method based on zero‐sequence voltage (ZSV) injection is proposed. The method takes reducing the maximum amplitude of the voltage fluctuation of the three‐phase floating capacitor as the control target. Firstly, the mathematical equation between the modulation voltage and the voltage fluctuation of the FCs are established, and then the maximum fluctuation amplitude of the FCs voltage is obtained by using the established mathematical equations. Secondly, the range of ZSV injection is determined according to the conditions such as the control of neutral point voltage and the limitation of high‐phase voltage leaps. Finally, the equations of the maximum amplitude in the voltage fluctuation of the three‐phase FCs are established, and the ZSV with the minimum voltage amplitude fluctuation of the FCs is obtained within the effective range of the ZSV injection. Compared with the traditional shifted pulse width modulation (SPWM)/space vector pulse width modulation (SVPWM) method, the proposed method can effectively reduce the fluctuation of the FC voltage by 50%. Simulation and experimental results are presented to verify the effectiveness of the proposed method.

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“…Multi-level converters have attracted attention and research from many scholars due to their characteristics of high output quality, strong fault tolerance, and excellent scalability [4]. The research content covers topologies [5], modulation strategies [6], fault diagnosis [7], fault-tolerant operation [8], loss optimization [9,10], etc. When a multi-level converter is used as a power converter in ESS [11,12], the energy storage batteries can be distributed among the sub-units of the converter.…”

Section: Introductionmentioning

confidence: 99%

An Analysis and Optimization of the Battery Capacity Difference Tolerance of the Modular Multi-Level Half-Bridge Energy Storage Converter

Pan,

Wang,

Buja

2023

Energies

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As a power converter of battery energy storage, the multi-level converter and its battery balancing control have received much attention from scholars. This paper focuses on the modular multi-level half-bridge energy storage converter (MMH-ESC), including its topology, working principle, and pulse width modulation (PWM) methods. Under the battery balancing control strategy based on level-shifted carrier PWM (LS-PWM), formulas are derived and calculations are performed to get the charge or discharge of each submodule (SM), thereby obtaining the tolerance for capacity differences among these batteries. A range of battery capacity values that can maintain a balanced state is provided to enhance flexibility in battery configuration and utilization, avoiding the limitation of all batteries to the same capacity. Finally, a new bridge arm modulation wave allocation method is proposed. This method significantly expands the range of SM battery capacity selection and provides a high-tolerance modulation method for the converter under extreme or even fault conditions.

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Low-Frequency Scheduler for Optimal Conduction Loss in Series/Parallel Modular Multilevel Converters

Cited by 24 publications

References 63 publications

Beyond the MMC: Extended Modular Multilevel Converter Topologies and Applications

Beyond the MMC: Extended Modular Multilevel Converter Topologies and Applications

An optimization method for reducing the voltage fluctuation of the floating‐capacitor in ANPC five‐level inverter

An Analysis and Optimization of the Battery Capacity Difference Tolerance of the Modular Multi-Level Half-Bridge Energy Storage Converter

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