Survey on the Hexverter topology &amp;#x2014; A modular multilevel AC/AC converter

Karwatzki, Dennis; Baruschka, Lennart; Mertens, Axel

doi:10.1109/icpe.2015.7167914

Cited by 29 publications

(29 citation statements)

References 11 publications

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“…at t = 2 s and restores to 1.0 p.u. at t = 2.5 s. In this case, the outer‐loop control (26) and (28) must be replaced by constant reactive power control . Figure (a) shows the voltage of source‐side system.…”

Section: Simulation Verificationmentioning

confidence: 99%

“…It is also shown in [20] that the Hexverter system offers superior performance for low-frequency wind turbines. Other research on Hexverter mainly focuses on its branch energy control based on adjacent compensating power [21][22][23]. Compared with M3C, only six branches are required for Hexverter to achieve AC/AC conversion, so equipment volume and cost is greatly reduced.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Control of Modular Multilevel AC/AC Converter in Y Configuration for Fractional Frequency Transmission System

Meng

Shang

et al. 2020

IEEJ Transactions Elec Engng

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The modular multilevel AC/AC converter topology in Y configuration, which is called Y‐MMC, suitable for fractional frequency transmission system is proposed in this paper. Y‐MMC can directly connect two three‐phase AC systems of different frequencies and voltage amplitudes with only six equivalent branches, and it has satisfying performance in power quality and characteristics. Y‐MMC enjoys a simple and symmetrical structure with no circulating current problem. The detailed topology and operating principle of Y‐MMC are addressed in this paper. The frequency‐decoupled mathematical model of the Y‐MMC system is deduced. Corresponding control scheme is thoroughly designed, including the inner loop current control, the outer loop control, the individual‐balancing control, and frequency leakage suppression control. The paper also lays emphasis on the optimization of reactive power distribution between the main branches and the assistant branches of Y‐MMC. The validity of the Y‐MMC topology and the effectiveness of the proposed control scheme are verified by the simulation results in MATLAB/Simulink. © 2020 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Section: Simulation Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and Control of Modular Multilevel AC/AC Converter in Y Configuration for Fractional Frequency Transmission System

Meng

Shang

et al. 2020

IEEJ Transactions Elec Engng

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“…Substituting (18) and (19) into (1) and (2), the branch voltage and current can be derived as follows:…”

Section: Branch Power Analysis Of Hexvertermentioning

confidence: 99%

“…Subsequent studies on the Hexverter mainly focus on its branch energy control based on adjacent compensating power [16][17][18]. Reference [19] presents a simplified qualitative comparison of previously presented cascaded multilevel converter topologies for AC/AC conversion, with particular emphasis on motor drive applications.…”

Section: Introductionmentioning

confidence: 99%

Control scheme of hexagonal modular multilevel direct converter for offshore wind power integration via fractional frequency transmission system

Meng

Liu²,

Luo³

et al. 2017

J. Mod. Power Syst. Clean Energy

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A fractional frequency transmission system (FFTS) is a promising solution to offshore wind power integration, for which the hexagonal modular multilevel converter (Hexverter) is an attractive choice for power conversion. The Hexverter has recently been proposed to directly connect two three-phase systems of different frequencies and voltage amplitudes, with only six branches in the FFTS in that case. This paper examines for the first time the control scheme of the Hexverter when applied to offshore wind power integration via a FFTS. Firstly, the frequency-decoupled mathematical model of the Hexverter is deduced by introducing the double dq transformation. Then the branch energy of the Hexverter is analyzed in detail and the reactive power constraint equation is obtained. The corresponding control scheme is thoroughly discussed, including the inner loop current control, the outer loop voltage control in both grid-connected mode and passive mode, and a novel optimization method to minimize the circulating current in the Hexverter. Finally, a simulation model of offshore wind power integration via a 4-terminal FFTS based on the Hexverter is built in MATALB/Simulink to verify the feasibility of Hexverter and the effectiveness of the control scheme proposed in this paper.

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“…A chainlink based matrix converter which is capable of producing AC output by using unipolar submodules is presented in [14]. Hexverter, using six branches of Modular Multilevel Converter (MMC) for three-phase AC-AC system, is surveyed in [15]. In [16] a Hexverter arisen by omitting DC-link of back-to-back modular multilevel converter is presented.…”

Section: Introductionmentioning

confidence: 99%

T‐type direct AC/AC converter structure

Khodabandeh

Zolghadri

Shahbazi

et al. 2016

IET Power Electronics

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Survey on the Hexverter topology — A modular multilevel AC/AC converter

Cited by 29 publications

References 11 publications

Modeling and Control of Modular Multilevel AC/AC Converter in Y Configuration for Fractional Frequency Transmission System

Modeling and Control of Modular Multilevel AC/AC Converter in Y Configuration for Fractional Frequency Transmission System

Control scheme of hexagonal modular multilevel direct converter for offshore wind power integration via fractional frequency transmission system

T‐type direct AC/AC converter structure

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