Enhanced control strategy of full-bridge modular multilevel converter

Adam, Grain Philip; Finney, S.J.; Williams, B.W.

doi:10.1109/icrera.2015.7418644

Cited by 10 publications

(5 citation statements)

References 19 publications

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“…The AC circuit breaker has a quick interruption function, but it takes relatively long to operate the circuit breaker, so there is the possibility of damage to the switch and to the device inside the converter. In 2011, a method was proposed of blocking the fault current by lowering the slope of the voltage by forming reverse voltage generated in the full bridge sub-module (FBSM) when a fault occurs [18,19]. However, in normal operation, this method is expensive when power loss deteriorates due to using double the number of passive devices compared with conventional HBSMs.…”

Section: Introductionmentioning

confidence: 99%

New Sub-Module with Reverse Blocking IGBT for DC Fault Ride-Through in MMC-HVDC System

Kim

2021

Energies

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When integrating multi-grid renewable energy systems, modular multi-level converters (MMCs) are promising for high-voltage DC (HVDC) transmission. Because of the characteristics of the system, however, it is more difficult to prevent a fault at the DC terminal than at the AC terminal of the MMC. Accordingly, a fault ride-through (FRT) strategy for the operation of the MMC in the DC terminal is required for stable system operation. In this paper, a solution for closed-circuit overcurrent caused by a permanent line-to-line DC fault is proposed. This method is able to reduce the fault current through the adjustment of the slope of the total voltage in the system by operating a sub-module having lower switching losses and fewer passive devices compared with existing topologies. Additionally, through the equivalent circuit of the proposed scheme in a sub-module in case of a fault, the FRT mechanism for the fault current is explained. The feasibility of this proposed technique was verified through time-domain simulations implemented by Powersim, Inc.

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Section: Introductionmentioning

confidence: 99%

New Sub-Module with Reverse Blocking IGBT for DC Fault Ride-Through in MMC-HVDC System

Kim

2021

Energies

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“…This corresponds to the minimum number of FB submodules needed to offer dc fault blocking, without exposing submodule capacitors and switching devices to excessive voltage stresses [13]. Generally, the number of HB and FB submodules in mixed submodule MMC could be selected to deliver custom features [14]. However, the use of two types of submodules may lead to limited compromise to the modularity of the power circuit and increase the complexity of the modulation and control.…”

Section: Introductionmentioning

confidence: 99%

Modular multilevel converter with modified half‐bridge submodule and arm filter for dc transmission systems with dc fault blocking capability

Ahmed¹,

Adam²,

Abdelsalam

et al. 2018

IET Power Electronics

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Although a modular multilevel converter (MMC) is universally accepted as a suitable converter topology for the high voltage dc transmission systems, its dc fault ride performance requires substantial improvement in order to be used in critical infrastructures such as transnational multi-terminal dc (MTDC) networks. Therefore, this paper proposes a modified submodule circuit for modular multilevel converter that offers an improved dc fault ride through performance with reduced semiconductor losses and enhanced control flexibility compared to that achievable with full-bridge submodules. The use of the proposed submodules allows MMC to retain its modularity; with semiconductor loss similar to that of the mixed submodules MMC, but higher than that of the half-bridge submodules. Besides dc fault blocking, the proposed submodule offers the possibility of controlling ac current in-feed during pole-to-pole dc short circuit fault, and this makes such submodule increasingly attractive and useful for continued operation of MTDC networks during dc faults. The aforesaid attributes are validated using simulations performed in MATLAB/SIMULINK, and substantiated experimentally using the proposed submodule topology on a 4-level small-scale MMC prototype.

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“…MTDC grids represent the initial step for realisation of future super grids to facilitate bulky powers transfer over long distances, with tight control over the directions and magnitudes of the power transfer in each DC line [1][2][3][4][5][6][7]. Such MTDC systems are anticipated to consist of more than one DC voltage levels [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Multi-port Converter for Medium and High Voltage Applications

Alsokhiry

Al‐Turki

Abdelsalam

et al. 2018

2018 7th International Conference on Renewable Energy Research and Applications (ICRERA)

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Enhanced control strategy of full-bridge modular multilevel converter

Abstract: Key words-dc fault ride-through capability; dc short circuit proof; high-voltage dc transmission systems; half and full bridge modular multilevel converters; and line commutated converter.

Cited by 10 publications

References 19 publications

New Sub-Module with Reverse Blocking IGBT for DC Fault Ride-Through in MMC-HVDC System

New Sub-Module with Reverse Blocking IGBT for DC Fault Ride-Through in MMC-HVDC System

Modular multilevel converter with modified half‐bridge submodule and arm filter for dc transmission systems with dc fault blocking capability

Multi-port Converter for Medium and High Voltage Applications

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