A New H-Bridge Hybrid Modular Converter (HBHMC) for HVDC Application: Operating Modes, Control, and Voltage Balancing

Ghat, Mahendra B.; Shukla, Anshuman

doi:10.1109/tpel.2017.2751680

Cited by 52 publications

(17 citation statements)

References 44 publications

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“…These topologies, with a specific harmonic elimination modulation, were proposed to optimize the conventional two-level converter in terms of ac output quality, switching losses, and dc fault blocking ability [12]- [14]. Three-phase series and parallel hybrid MMCs were later proposed based on the same director-switch concept [15]. However, the high dv/dt stress over director switches is the main problem for high voltage applications, and although the series-connected configuration distributes the dc-link voltage into three levels, balancing capacitor voltages needs intricate control, especially during unbalanced grid faults.…”

Section: Introductionmentioning

confidence: 99%

A T-Type Modular Multilevel Converter

Wang

Massoud

Williams

2021

IEEE J. Emerg. Sel. Topics Power Electron.

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This paper proposes a novel modular multilevel converter (MMC) named 'T-type MMC' (T-MMC) for reliable, controllable and efficient performance in energy conversion applications. Circuitry configurations and control structures are presented, with respect to fundamental and additional functions. The T-MMC topology consists of two solid-state power stages (Stage-I and Stage-II), which are coordinated for ac and dc fault tolerance, increased ac-side voltage synthesis, etc. Energy storage elements can be integrated into the submodules. As a result, the T-MMC based energy storage system can not only increase system inertia but maintain continuous power transmission during faults. A thyristor forcedcommutation technique facilitates actively-controlled utilization of symmetrical thyristors in the conduction path; thus T-MMC normal-mode operation losses can be equivalent to those of the conventional half-bridge MMC. Simulation and experimentation demonstrate the performance of the T-MMC. Index Terms − T-Type Modular Multilevel Converter, ac/dc fault, thyristor, energy storage system.

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Section: Introductionmentioning

confidence: 99%

A T-Type Modular Multilevel Converter

Wang

Massoud

Williams

2021

IEEE J. Emerg. Sel. Topics Power Electron.

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“…MMCs necessitate a complex control structure to effectuate the multiple control objectives such as output current control, capacitor voltage balancing (VB), inter‐arm voltage/energy balancing control, and circulating current (CC) suppression control [2, 3]. In the last decade, substantial research in terms of the submodule (SM) topologies, high‐performance control schemes, VB control methods, SM capacitor ripple minimisation schemes, and MMC derived hybrid topologies has been carried out to overcome the technical challenges associated with the operation and control [9–15].…”

Section: Introductionmentioning

confidence: 99%

Submodule power balancing control of modular multilevel converters under capacitor degradation

Ronanki

Williamson

2020

IET power electron.

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Section: Introductionmentioning

confidence: 99%

“…The converter design is a technical challenge for boosting LV directly to HV due to the conflict between the required high voltage level, e.g., ±800 kV [9] and the restricted voltage ratings of semiconductor components, e.g., 22 kV for SiC thyristors, and 15 kV for SiC transistors [10]. Fortunately, with the development of semiconductors and converter topologies, possible solutions are provided [11][12][13]. To address the challenges, DC converters with high voltage gains [14][15][16][17], modular multilevel converters (MMCs) [18][19][20][21][22] and multi-module converters [23][24][25] are studied extensively.…”

Section: Introductionmentioning

confidence: 99%

Multi-Port High Voltage Gain Modular Power Converter for Offshore Wind Farms

Song

et al. 2018

Sustainability

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In high voltage direct current (HVDC) power transmission of offshore wind power systems, DC/DC converters are applied to transfer power from wind generators to HVDC terminals, and they play a crucial role in providing a high voltage gain, high efficiency, and high fault tolerance. This paper introduces an innovative multi-port DC/DC converter with multiple modules connected in a scalable matrix configuration, presenting an ultra-high voltage step-up ratio and low voltage/current rating of components simultaneously. Additionally, thanks to the adoption of active clamping current-fed push-pull (CFPP) converters as sub-modules (SMs), soft-switching is obtained for all power switches, and the currents of series-connected CFPP converters are auto-balanced, which significantly reduce switching losses and control complexity. Furthermore, owing to the expandable matrix structure, the output voltage and power of a modular converter can be controlled by those of a single SM, or by adjusting the column and row numbers of the matrix. High control flexibility improves fault tolerance. Moreover, due to the flexible control, the proposed converter can transfer power directly from multiple ports to HVDC terminals without bus cable. In this paper, the design of the proposed converter is introduced, and its functions are illustrated by simulation results.

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A New H-Bridge Hybrid Modular Converter (HBHMC) for HVDC Application: Operating Modes, Control, and Voltage Balancing

Cited by 52 publications

References 44 publications

A T-Type Modular Multilevel Converter

A T-Type Modular Multilevel Converter

Submodule power balancing control of modular multilevel converters under capacitor degradation

Multi-Port High Voltage Gain Modular Power Converter for Offshore Wind Farms

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