Modular Multilevel Converters for Transportation Electrification: Challenges and Opportunities

Ronanki, Deepak; Williamson, Sheldon S.

doi:10.1109/tte.2018.2792330

Cited by 269 publications

(113 citation statements)

References 70 publications

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“…where T d is the time delay of the control system. Equation (31) links v s to i s through (10), meaning that neither the sum capacitor voltages nor the single-phase side quantities appear in the admittance calculation. Effectively, the admittance of the ac/ac MMC coincides with the admittance of an ac/dc MMC with analogous settings [26], and also with the admittance of a two-level VSC [33], with a VSC phase inductance of L/2.…”

Section: A Three-phase Side Admittancementioning

confidence: 99%

“…As concluded in [9] and [10], MMCs will be the main future solution for ac railway power supplies. However, being a relatively recent and unconventional subject, the existing literature on ac/ac MMCs for railway power supplies and similar applications is somewhat scarce.…”

Section: Introductionmentioning

confidence: 97%

“…M ODULARITY, scalability, low power losses, and low harmonic distortion are several properties that make modular multilevel converters (MMCs) [1], [2] increasingly used in high-power applications, such as voltage source converter (VSC) based high-voltage dc systems, static synchronous compensators, and medium-voltage motor drives [3]- [6]. MMCs can be configured to perform ac/ac conversion, which makes them suitable as railway power supplies [7]- [10], especially in European countries with a low-frequency railway grid, e.g., Germany (16.7 Hz) and Sweden (16 2 / 3 Hz). Compared with other VSCs for railway power supplies, the MMC is a particularly attractive solution because it can operate without the 16 2 / 3 Hz transformer and the 33 Hz filter, which are costly and bulky [7].…”

Section: Introductionmentioning

confidence: 99%

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Control and Admittance Modeling of an AC/AC Modular Multilevel Converter for Railway Supplies

Bessegato

Ilves

Harnefors

et al. 2020

IEEE Trans. Power Electron.

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Control and Admittance Modeling of an AC/AC Modular Multilevel Converter for Railway Supplies IEEE transactions on power electronicsAccess to the published version may require subscription. N.B. When citing this work, cite the original published paper. Permanent link to this version:Abstract-Modular multilevel converters (MMCs) can be configured to perform ac/ac conversion, which makes them suitable as railway power supplies. In this paper, a hierarchical control scheme for ac/ac MMCs for railway power supplies is devised and evaluated, considering the requirements and the operating conditions specific to this application. Furthermore, admittance models of the ac/ac MMC are developed, showing how the suggested hierarchical control scheme affects the three-phase and the single-phase side admittances of the converter. These models allow for analyzing the stability of the interconnected system using the impedance-based stability criterion and the passivitybased stability assessment. Finally, the findings presented in this paper are validated experimentally, using a down-scaled MMC.

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Section: A Three-phase Side Admittancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Control and Admittance Modeling of an AC/AC Modular Multilevel Converter for Railway Supplies

Bessegato

Ilves

Harnefors

et al. 2020

IEEE Trans. Power Electron.

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“…Actually, the integration of various PEC in a single circuitry (reconfigurable PEC or RPEC) is preferred because it has several advantages such as low cost, portability, modularity, an increment of power density, and a wide operation region [15][16][17][18][19][20][21][22][23][24][25][26][27][28]. However, this increment of versatility rises the modeling and control complexity.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

A Reconfigurable Buck, Boost, and Buck-Boost Converter: Unified Model and Robust Controller

Licea

Pérez-Pinal

Gutiérrez

et al. 2018

Mathematical Problems in Engineering

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The need for reconfigurable, high power density, and low-cost configurations of DC-DC power electronic converters (PEC) in areas such as the transport electrification and the use of renewable energy has spread out the requirement to incorporate in a single circuit several topologies, which generally result in an increment of complexity about the modeling, control, and stability analyses. In this paper, a reconfigurable topology is presented which can be applied in alterative/changing power conversion scenarios and consists of a reconfigurable Buck, Boost, and Buck-Boost DC-DC converter (RBBC). A unified averaged model of the RBBC is obtained, a robust controller is designed through a polytopic representation, and a Lyapunov based switched stability analysis of the closed-loop system is presented. The reported RBBC provides a wide range of voltage operation, theoretically from −∞ to ∞ volts with a single power source. Robust stability, even under arbitrarily fast (bounded) parameter variations and reconfiguration changes, is reported including numerical and experimental results. The main advantages of the converter and the robust controller proposed are simple design, robustness against abrupt changes in the parameters, and low cost.

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“…Moreover, torque production happens during charging, which can result into motor rotation. The other associated problems are acoustic noise and mechanical vibrations [13].…”

Section: Introductionmentioning

confidence: 99%

Extreme Fast Charging Technology—Prospects to Enhance Sustainable Electric Transportation

2019

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With the growing fleet of a new generation electric vehicles (EVs), it is essential to develop an adequate high power charging infrastructure that can mimic conventional gasoline fuel stations. Therefore, much research attention must be focused on the development of off-board DC fast chargers which can quickly replenish the charge in an EV battery. However, use of the service transformer in the existing fast charging architecture adds to the system cost, size and complicates the installation process while directly connected to medium-voltage (MV) line. With continual improvements in power electronics and magnetics, solid state transformer (SST) technology can be adopted to enhance power density and efficiency of the system. This paper aims to review the current state of the art architectures and challenges of fast charging infrastructure using SST technology while directly connected to the MV line. Finally, this paper discusses technical considerations, challenges and introduces future research possibilities.

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Modular Multilevel Converters for Transportation Electrification: Challenges and Opportunities

Cited by 269 publications

References 70 publications

Control and Admittance Modeling of an AC/AC Modular Multilevel Converter for Railway Supplies

Control and Admittance Modeling of an AC/AC Modular Multilevel Converter for Railway Supplies

A Reconfigurable Buck, Boost, and Buck-Boost Converter: Unified Model and Robust Controller

Extreme Fast Charging Technology—Prospects to Enhance Sustainable Electric Transportation

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