A Dual Modular Multilevel Converter With High-Frequency Magnetic Links Between Submodules for MV Open-End Stator Winding Machine Drives

Diab, Mohamed S.; Massoud, Ahmed M.; Ahmed, Shehab; Williams, B.W.

doi:10.1109/tpel.2017.2735195

Cited by 61 publications

(40 citation statements)

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“…With fundamental and second-order ripple powers pulsating simultaneously in MMC arms [13], the SM capacitors experience wide voltage fluctuations, especially at low operating frequencies, that could threat the safety of switching devices and adversely affect the MMC normal operation. To maintain SM capacitor voltageripple within tolerated values, the SM capacitance should be designed fairly large to compensate for the high voltage-ripple, which increases the converter volume and weight, while increasing the system stored energy.…”

Section: Low-frequency Operationmentioning

confidence: 99%

“…Nonetheless, multilevel converter topologies are much preferred as motor drives in MV applications, being able to provide a stepped output voltage waveform that reduces / stresses on the motor terminals. With the shortcomings of the state-of-the-art multilevel converter topologies [9]- [11], the modular multilevel converter (MMC) has established itself as a mature technology with prominent advantages that enabled it to be a standard converter interface in the high-voltage directcurrent transmission field [12], while promoting it as a promising candidate for MV machine drives [13]. Since threephase MMC topologies can be typically extended to supply sixphase machines, six-phase MMC configurations are not frequently reported in literature [14].…”

Section: Introductionmentioning

confidence: 99%

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Quasi two-level PWM operation of a nine-arm modular multilevel converter for six-phase medium-voltage motor drives

Diab

Adam

Williams

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-This paper proposes a hybrid converter for mediumvoltage six-phase machine drive systems that mixes the operation of a traditional two-level voltage-source inverter and the modular multilevel converter (MMC) to enable operation over a wide frequency range. Topologically, the proposed converter consists of nine arms resembling two sets of three-phase MMCs with three common arms, yielding a nine-arm MMC with a 25% reduction in the number of employed arms compared to a traditional dual three-phase MMC. The multilevel property of a standard MMC is emulated in the proposed converter, however on a two-level basis, resulting in a stepped two-level output voltage waveform. The proposed converter has a reduced footprint with advantages of small voltage steps, modular structure, and ease of scalability. Further, it is able to drive high-power six-phase machines within low operating frequencies at the rated torque. The operating principle of the converter is elaborated, and its modulation scheme is discussed. The features of the proposed converter are verified through simulations and experimentally.Index Terms-Medium-voltage drives, modular multilevel converter (MMC), nine-arm MMC, six-phase machines, submodule (SM) capacitor voltage ripple, quasi two-level PWM.

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Section: Low-frequency Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quasi two-level PWM operation of a nine-arm modular multilevel converter for six-phase medium-voltage motor drives

Diab

Adam

Williams

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

Self Cite

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“…De (17), considerando a relação de transformação k, a tensão no secundário do TMF pode ser também expressa como:…”

Section: ) Tensão No Secundário Do Transformador V S : Pode Ser Deteunclassified

“…Diversos recursos contribuem para sua confiabilidade, como modularidade, escalabilidade e formas de onda com baixa distorção harmônica [15], [16]. Além dos CMMs, as topologias que utilizam transformadores de interfase e de média frequência, como aquelas discutidas em [17]- [20], apresentam vantagens quanto à redução das correntes sobre semicondutores e a transferência de potência em média frequência com isolação galvânica. Estas características se resumem à menores perdas de condução, e menor peso, volume e custo, quando comparado às topologias que utilizem transformadores convencionais de 50-60 Hz [21], [22].…”

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Estudo e Validação Experimental de um Conversor Multinível Modular Entrelaçado CA-CC Monofásico Para Aplicações de Transformadores de Estado Sólido

Joca¹,

Barreto²,

Júnior³

et al. 2018

Eletrônica de Potência

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Este artigo tem como objetivo apresentar o estudo teórico e a obtenção de resultados experimentais de uma topologia monofásica baseada em um conversor multinível modular entrelaçado. A estrutura pode ser empregada como o estágio ca-cc em aplicações de transformador de estado sólido. O objetivo é a conexão entre uma rede elétrica ca de média tensão e uma rede cc de baixa tensão. A nova técnica de entrelaçamento divide as correntes através das pernas do conversor multinível modular e é responsável pela modulação de tensão nos submódulos. O transformador de média frequência de 10 kHz fornece isolação galvânica e conecta o conversor multinível modular entrelaçado a um conversor de ponte completa. As características do conversor são discutidas, considerando a estrutura, o princípio de operação, a técnica de modulação e o esquema de controle. O sistema de controle regula a corrente de entrada e a tensão de barramento, no lado de alta tensão, e a tensão de saída e o fluxo de potência bidirecional, no lado de baixa tensão. A validação experimental do conversor é feita com um protótipo de pequena escala.

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Hybrid space‐vector pulse width modulation strategies for a four‐level open‐end winding induction motor drive with an improvised harmonic performance and balanced DC ‐link capacitors

Lakhimsetty

Kumar

Somasekhar

2021

Int Trans Electr Energ Syst

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Summary The four‐level open‐end winding induction motor (4‐L OEWIM) drive is constituted by two 2‐level voltage source inverters (VSIs), wherein their DC‐link voltages should be maintained in the ratio of 2:1. Owing to the unsymmetrical structure of the power circuit, the 4‐L OEWIM drive is plagued with the drawback of capacitor voltage imbalance. The DC‐link capacitor of one of the inverters, which is operated with the lower voltage level, that show the propensity of getting charged up by its higher voltage counterpart, belonging to the other inverter. In this article, two variants of space‐vector pulse width modulation (SVPWM) schemes are suggested for the 4‐L OEWIM drive. The suggested sample based SVPWM techniques achieve the voltage balancing of the DC‐link capacitors, while improving the harmonic performance of the drive. Specifically, one of the two proposed PWM schemes manages to clamp one of the inverters in every sampling time interval. Hence this scheme results in lowering the total harmonic distortion (THD) in the no‐load current in most of the operating range of the drive, resulting in lower ripple in the motor phase current, lower ohmic loss and reduced torque ripple. The performances of the proposed PWM techniques are assessed with the aid of simulation studies and are validated with the experimentation.

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A Dual Modular Multilevel Converter With High-Frequency Magnetic Links Between Submodules for MV Open-End Stator Winding Machine Drives

Abstract: proportional to the magnitude of the output current, while inversely proportional to the operating frequency. With this serious

Cited by 61 publications

References 59 publications

Quasi two-level PWM operation of a nine-arm modular multilevel converter for six-phase medium-voltage motor drives

Quasi two-level PWM operation of a nine-arm modular multilevel converter for six-phase medium-voltage motor drives

Estudo e Validação Experimental de um Conversor Multinível Modular Entrelaçado CA-CC Monofásico Para Aplicações de Transformadores de Estado Sólido

Hybrid space‐vector pulse width modulation strategies for a four‐level open‐end winding induction motor drive with an improvised harmonic performance and balanced DC ‐link capacitors

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