Overview on submodule topologies, modeling, modulation, control schemes, fault diagnosis, and tolerant control strategies of modular multilevel converters

Deng, Fujin; Lu, Yong-Qing; Liu, Chengkai; Qian, Heng; Yu, Qiang; Zhao, Jifeng

doi:10.23919/cjee.2020.000001

Cited by 111 publications

(46 citation statements)

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“…Both the analytical and experimental approaches provide the same results. As can be seen, in the inverter side the most stressed switches are Sy,21, Sy,22, while the least stressed switches are located in the middle leg Sy, 23,Sy,24. In the rectifier side, the most stressed and the least stressed power semiconductors are Dx, 21,Dx,22 and Sx,23,Sx,24, respectively. Based on the datasheet provided by the power semiconductor manufacturers, it has been possible to estimate the efficiency distribution of the proposed converters using an analytical approach and a simulation approach.…”

Section: Simulation Resultsmentioning

confidence: 96%

“…In fact, the number of power semiconductors in multilevel converters increases as the number of the voltage levels increases, and, therefore, we could think that cost and reliability worsen. However, some multilevel topologies proposed in the literature have fault tolerance capability [22][23][24]. Additionally, even if the number of power devices increases, there is a reduction in passive devices, which leads to less use of copper and iron.…”

Section: Introductionmentioning

confidence: 99%

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High-Performance 3-Phase 5-Level E-Type Multilevel–Multicell Converters for Microgrids

et al. 2021

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This paper focuses on the analysis and design of two multilevel–multicell converters (MMCs), named 3-phase 5-Level E-Type Multilevel–Multicell Rectifier (3Φ5L E-Type MMR) and 3-phase 5-Level E-Type Multilevel–Multicell Inverter (3Φ5L E-Type MMI) to be used in microgrid applications. The proposed 3-phase E-Type multilevel rectifier and inverter have each phase being accomplished by the combination of two I-Type topologies connected to the T-Type topology. The two cells of each phase of the rectifier and inverter are connected in interleaving using an intercell transformer (ICT) in order to reduce the volume of the output filter. Such an E-Type topology arrangement is expected to allow both the high efficiency and power density required for microgrid applications, as well as being capable of providing good performance in terms of quality of the voltage and current waveforms. The proposed hardware design and control interface are supported by the simulation results performed in Matlab/Simulink. The analysis has been then validated in terms of an experimental campaign performed on the converter prototype, which presented a power density of 8.4 kW/dm3 and a specific power of 3.24 kW/kg. The experimental results showed that the proposed converter can achieve a peak efficiency of 99% using only silicon power semiconductors.

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Section: Simulation Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

High-Performance 3-Phase 5-Level E-Type Multilevel–Multicell Converters for Microgrids

et al. 2021

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“…The advantages of paralleling the legs using the ICT lies in the fact that the phase current is equally shared between the legs, the amplitude of the total current ripple is reduced and the harmonic contents of the voltage at high frequency are shifted at twice the switching frequency. The main idea of using the five-level converter is to improve the equality of the voltage and current waveforms without giving up the benefit of high efficiency and high-power density [28][29][30]. In fact, keeping constant the switching frequency and the other passive parameters, increasing the number of voltage levels means reducing the current ripple, which leads to a low Total Harmonic Distortion (THD).…”

Section: Multilevel Convertersmentioning

confidence: 99%

Design and Implementation of Reduced Grid Impact Charging Station for Public Transportation Applications

Benedetto

Ortenzi

Lidozzi

et al. 2021

WEVJ

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This paper deals with the complete design procedure, implementation and control software realization for a multi-converter charging station with reduced grid impact due to local electromechanical energy storage. In particular, energy storage is accomplished by a dedicated flywheel designed and built for this purpose. The proposed charging station was designed for ultra-fast charging procedures presenting a strongly reduced impact on the electrical grid. Modes of operations are described with reference to pure electric buses in public transportation applications.

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“…It has the advantages of low switching frequency, small output voltage change rate, and excellent system Fig. 4 MMC topology electromagnetic compatibility [28][29] . It also has the disadvantages of circulating current suppression, interphase circulating current suppression, and sub-module capacitor voltage equalization.…”

Section: Topologymentioning

confidence: 99%

Review of low carrier ratio converter system

Zhang

Luo

et al. 2021

Chin. J. Electr. Eng.

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With the rapid development of new energy power generation and high-power traction technology, the voltage and power levels of converter devices have been continuously improved, and the application of high-power converters is becoming increasingly widespread. However, high-power converters are affected by switching losses and heat dissipation, meaning they are not suitable for high carrier conditions. Therefore, research of low carrier ratio converter systems has received increased attention. Based on existing research, the problems of large current harmonics, low observation accuracy, and poor stability that may occur at low carrier ratios are explained. In addition, the topologies, modulation strategies, and control methods of the low carrier ratio converter system are analyzed and classified. Finally, future research directions of low carrier ratio converter systems are proposed.

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Overview on submodule topologies, modeling, modulation, control schemes, fault diagnosis, and tolerant control strategies of modular multilevel converters

Cited by 111 publications

References 0 publications

High-Performance 3-Phase 5-Level E-Type Multilevel–Multicell Converters for Microgrids

High-Performance 3-Phase 5-Level E-Type Multilevel–Multicell Converters for Microgrids

Design and Implementation of Reduced Grid Impact Charging Station for Public Transportation Applications

Review of low carrier ratio converter system

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