AC-Inductors Design for a Modular Multilevel TSBC Converter, and Performance of a Low-Speed High-Torque Motor Drive Using the Converter

Kawamura, Wataru; Hagiwara, Makoto; Akagi, Hirofumi; Tsukakoshi, Masahiko; Nakamura, Ritaka; Kodama, Sumiyasu

doi:10.1109/tia.2017.2713338

Cited by 21 publications

(21 citation statements)

References 12 publications

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“…(1) Despite the high number of power cells required by the M3C, its constructive characteristics allow low-frequency operation with low circulating current requirements. Moreover, the above-mentioned advantages and its grid-code compliance performance are examined among the other high-power converter topologies in some real-world applications such as high-power wind energy and motor drive systems [41][42][43]. (2) Unlike a low voltage small grid, a power energy transmission system is a bulk costly system with expensive components and installation process.…”

Section: On Real-world Applicability Of the Proposed Approachmentioning

confidence: 99%

“…Therefore, they can be considered a mature and proven technology. Some reported applications are addressed in [17,[40][41][42][43][44], and M3Cs for these applications are commercially offered by a growing group of companies in the field [45]. (6) The M3C is the only converter system that effectively increases the power rating of the converter.…”

Section: On Real-world Applicability Of the Proposed Approachmentioning

confidence: 99%

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A Novel Control Scheme for Multi-Terminal Low-Frequency AC Electrical Energy Transmission Systems Using Modular Multilevel Matrix Converters and Virtual Synchronous Generator Concept

et al. 2020

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This paper proposes a new control scheme for the low frequency AC transmission (LFAC) system aiming at extending the point-to-point configuration to form a multi-terminal electrical energy network. The multi-terminal low frequency ac (MT-LFAC) system configuration is based on the use of modular multilevel matrix converters (M3Cs) and virtual synchronous generator (VSG) control. The M3C is the next ac/ac converter generation, which is used as an interface with the conventional AC network and the LFAC electrical energy system. Application of VSG control is proposed to enable proper power sharing, to provide synchronization of each terminal, and frequency stabilization, thus, to offer multiterminal forming capability. Two different operation modes are applied in the system to damp the frequency deviation after a dynamic perturbation, which provides additional stabilization feature to the VSG. Frequency restoration mode and commanded mode of power sharing are applied as dynamic states to validate the robustness of the VSG control system. Besides, to solve the negative impact of low X/R ratio in the LFAC electrical energy system, we enhance the VSG control by proposing a virtual-impedance-based solution, which increases the output total impedance on the low frequency side and prevents the coupling between P and Q. The operation of the proposed system is examined by simulation results with a precise model of M3Cs in the PSCAD/ EMTDC software environment (version 4.2.1, Winnipeg, MB, Canada).Energies 2020, 13, 747 2 of 19 delivery. However, neither technology is flawless. For example, the existence of the power electronic switches in the dc circuit breakers make them more vulnerable than the HVAC transmission system, especially when a fault takes place in the converter, due to the low dc-side impedances and sensitive semiconductor power converters [1,2]. On the other hand, the HVAC system offers advantages, such as more reliability of the well-known protection schemes and the change capability of voltage levels using transformers [3]. However, the HVAC transmission system's main disadvantage is the existence of the reactive power in comparison to no reactive power in the HVDC electrical energy system. Due to that, the existence of the reactive power can be translated as losses in the grid [4].The aforementioned points have led to an alternative solution which combines both sets of HVACs and HVDC advantages, known as a low frequency ac (LFAC) transmission system, or a fractional frequency transmission system (FFTS) [5][6][7]. This system transmits the power at a lower frequency range of about 1-60/3 Hz. The LFAC has already been proposed for the offshore wind energy and has offered attractive advantages compared to both transmission solutions. For example, in the HVDC electrical energy system, the implementation of a high capacity dc circuit breaker is difficult due to the absence of the zero crossing points of the DC current [8]. On the other hand, the LFAC system has zero-crossing, thus, the protection is more advantag...

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Section: On Real-world Applicability Of the Proposed Approachmentioning

confidence: 99%

Section: On Real-world Applicability Of the Proposed Approachmentioning

confidence: 99%

A Novel Control Scheme for Multi-Terminal Low-Frequency AC Electrical Energy Transmission Systems Using Modular Multilevel Matrix Converters and Virtual Synchronous Generator Concept

et al. 2020

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“…Since a TSBC converter is suitable for high-power, low-speed, high-torque motor drives from a practical point of view, it will take the place of a traditional naturally commutated cycloconverter in the near future. The simple reason is that the TSBC converter would be free from shunt capacitors and shunt harmonic filters installed at the AC mains side [48][49][50][51][52][53].…”

Section: Motor Drive Applications a Few Manufacturersmentioning

confidence: 99%

A review of developments in the family of modular multilevel cascade converters

Akagi

2018

IEEJ Transactions Elec Engng

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This paper starts with a historical review of the family of modular multilevel cascade converters, and the topology and terminology of the family. Then, it answers the following question: 'What motivated the author to apply phase-shifted-carrier pulse-width modulation (PSC PWM) to the family?' The success in academic research on this application owes to integrating inter-cluster balancing or inter-arm balancing control into the middle layer of a hierarchical control system consisting of three layers. This integration makes it easy to expand the PSC PWM to any bridge-cell or chopper-cell count per cluster or arm. Finally, this paper ends with future scenarios of a few promising family members and their practical applications, from the personal experience and view of the author.

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“…Multilevel inverters (MLIs) have drawn much attention in renewable, vehicular and industrial applications [1][2][3][4][5][6]. Also, MLIs have been utilized in flexible AC transmission, heating and air conditions [7].…”

Section: Introductionmentioning

confidence: 99%

“…The proposed topology provides an optimized design solution to CMLI in terms of reducing the implementation cost and physical size while maintaining the quality of the output voltage waveform. Three-phase CMLI has been widely used in large-scale renewable energy applications to comply with the high-power conversion requirement [1][2][3][4]. In order to improve the quality of the output voltage waveform, the number of components required to implement the three-phase CMLI should be significantly increased which increases the implementation cost, inverter physical size and complicates the control system.…”

Section: Introductionmentioning

confidence: 99%

A Novel Concept for Three-Phase Cascaded Multilevel Inverter Topologies

et al. 2018

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Abstract:One of the key challenges in multilevel inverters (MLIs) design is to reduce the number of components used in the implementation while maximising the number of output voltage levels. This paper proposes a new concept that facilitates a device count reduction technique of existing cascaded MLIs. Moreover, the proposed concept can be utilised to extend existing single phase cascaded MLI topologies to three-phase structure without tripling the number of semiconductor components and input dc-supplies as per the current practice. The new generalized concept involves two stages; namely, cascaded stage and phase generator stage. The phase generator stage is a combination of a conventional three-phase two level inverter and three bi-directional switches while the cascaded stage can employ any existing cascaded topology. A laboratory prototype model is built and extensive experimental analyses are conducted to validate the feasibility of the proposed cascaded MLI concept.

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AC-Inductors Design for a Modular Multilevel TSBC Converter, and Performance of a Low-Speed High-Torque Motor Drive Using the Converter

Cited by 21 publications

References 12 publications

A Novel Control Scheme for Multi-Terminal Low-Frequency AC Electrical Energy Transmission Systems Using Modular Multilevel Matrix Converters and Virtual Synchronous Generator Concept

A Novel Control Scheme for Multi-Terminal Low-Frequency AC Electrical Energy Transmission Systems Using Modular Multilevel Matrix Converters and Virtual Synchronous Generator Concept

A review of developments in the family of modular multilevel cascade converters

A Novel Concept for Three-Phase Cascaded Multilevel Inverter Topologies

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