Asymmetric overlap and hysteresis current control of zero-current switched alternate arm converter

Wickramasinghe, Harith R.; Konstantinou, Georgios; Pou, Josep; Agelidis, Vassilios G.

doi:10.1109/iecon.2016.7793990

Cited by 17 publications

(28 citation statements)

References 18 publications

(36 reference statements)

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“…Presently, there are three types of 2α control, namely fixed 2α, variable 2α and asymmetric 2α. For fixed 2α, the duration when both DS upper_arm and DS lower_arm are closed is set at a constant value, which is selected by taking into account the ratings of DSs and the maximum voltage generated by the SMs per arm [13,39,46]. These papers, which employ the fixed 2α control, are listed in Fig.…”

Section: Overlap Period Controlmentioning

confidence: 99%

Arm energy balancing control in AACs: a comparative analysis

Leow

Ooi

2020

IET Power Electronics

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The alternate arm converter (AAC) is an emerging state-of-the-art topology for voltage-source converter (VSC) by combining two-level converter and modular multilevel converter (MMC). The AAC performs better than the MMC in terms of the ability to block DC-side faults and ride through AC-side faults. Moreover, the number of sub-modules (SMs) per arm of the AAC is reduced by about 50% compared with the MMC. The key issue with AAC is the energy deviation during the alternate operation between the upper and lower arms. Presently, several AAC balancing techniques have been proposed, but no comparative analysis has been performed to provide insight on the effect of each balancing technique on AAC performance. In this study, five proposed balancing techniques are reviewed accordingly, followed by comparing them in terms of four parameters-the presence of DC filter, balancing capability, the presence of redundant SMs and zero-current switching control. Furthermore, a simulation work has been performed to study and compare the effects of each of the five balancing techniques. Both literature and simulation-based comparative analysis are significant to help select appropriate balancing technique as well as to provide helpful insights to improve the existing balancing techniques.

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Section: Overlap Period Controlmentioning

confidence: 99%

Arm energy balancing control in AACs: a comparative analysis

Leow

Ooi

2020

IET Power Electronics

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“…2: High-level comparison selected hybrid converters (A≡ AAC, B≡ CMC-MMC, C≡ AFC-B converter, and D≡ hybrid converter with alternate common arm and director switches)[42,54,55,57,[110][111][112][113][114][115][116] …”

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confidence: 99%

Review of technologies for DC grids – power conversion, flow control and protection

Adam

Vrana

et al. 2019

IET Power Electronics

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This article reviews dc transmission technologies for future power grids. The article emphasizes the attributes that each technology offers in terms of enhance controllability and stability, resiliency to ac and dc faults, and encourage increased exploitations of renewable energy resources (RERs) for electricity generation. Discussions of ac/dc and dc/dc converters reveal that the self-commutated dc transmission technologies are critical for better utilization of large RERs which tend to be dispersed over wide geographical areas, and offer needed controllability for operation of centralized and decentralized power grids. It is concluded that the series power flow controllers have potential to restrict the expensive isolated dc/dc converters to few applications, in which the prevention of dc fault propagation is paramount. Cheaper non-isolated dc/dc converters offer dc voltage tapping and matching and power regulation but they are unable to prevent pole-shifting during pole-to-ground dc fault. To date hybrid dc circuit breakers target dc fault isolation times ranging from 3ms to 5ms; while the resonance-based dc circuit breakers with forced current zeros target dc fault clearance times from 8ms to 12.5ms.

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“…To control the differential current during this short period, different techniques have been explored such as the hysteresis controller [15,18] which allows high dynamics in addition to a simple implementation. Recently, a current control has been proposed in [19] providing, among other features, a reduced switching frequency compared to the hysteresis controller.…”

mentioning

confidence: 99%

“…To minimize the impact on the converter footprint and the losses, the Overlap period should be as short as possible (long enough to control the energy and achieve the DSs soft opening) to limit the SMs requirement. Mentioned in [18,20], an adaptive control of the overlap length can be implemented accordingly to the energy deviation at the beginning of the Overlap period.…”

mentioning

confidence: 99%

Energy and director switches commutation controls for the alternate arm converter

Vermeersch

Gruson

Guillaud

et al. 2019

Mathematics and Computers in Simulation

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This is an author-deposited version published in: https://sam.ensam.eu Handle IDAbstract The Alternate Arm Converter (AAC) is promising multilevel Voltage Source Converter (VSC) suitable for High Voltage Direct Current (HVDC) transmission systems. This converter exhibits interesting features such as a DC Fault Ride Through capability thanks to the use of Full-Bridge Sub-Modules (SM) and a smaller footprint than an equivalent Modular Multilevel Converter (MMC).After an analysis of the converter operating modes called Non-overlap and Overlap mode, a sequential representation of the AAC operation is proposed. The main originality of this paper is the use of the Petri Net to describe all the phases and to highlight their sequencing. According to the phases identified thanks to the sequential approach, models and control structures for the grid currents, the internal energy and the Zero Current Switching (ZCS) are detailed. Furthermore, the step-by-step approach proposed in this paper allows a clear and rigorous modelling of this complex converter.

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Asymmetric overlap and hysteresis current control of zero-current switched alternate arm converter

Cited by 17 publications

References 18 publications

Arm energy balancing control in AACs: a comparative analysis

Arm energy balancing control in AACs: a comparative analysis

Review of technologies for DC grids – power conversion, flow control and protection

Energy and director switches commutation controls for the alternate arm converter

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