DC fault ride‐through capability and STATCOM operation of a HVDC hybrid voltage source converter

Feldman, Ralph; Farr, Ewan; Watson, Alan J.; Clare, John; Wheeler, Patrick; Trainer, D.R.; Crookes, R.W.

doi:10.1049/iet-gtd.2012.0713

Cited by 27 publications

(25 citation statements)

References 21 publications

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“…This also facilitates blocking dc-side faults [34], [37], as the stacks have sufficient negative voltage capability to oppose the ac-grid voltage. During such events, the AAC can also act as a STATCOM in order to support the ac grid [34], [38], [39], similar to the system described in [40].…”

Section: A Alternate Arm Convertermentioning

confidence: 99%

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The Extended Overlap Alternate Arm Converter: A Voltage-Source Converter With DC Fault Ride-Through Capability and a Compact Design

Merlin

Soto

Judge

et al. 2018

IEEE Trans. Power Electron.

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122

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Abstract-The alternate arm converter (AAC) was one of the first modular converter topologies to feature dc-side fault ridethrough capability with only a small penalty in power efficiency. However, the simple alternation of its arm conduction periods (with an additional short overlap period) resulted in 1) substantial sixpulse ripples in the dc current waveform, 2) large dc-side filter requirements, and 3) limited operating area close to an energy sweet spot. This paper presents a new mode of operation called extended overlap (EO) based on the extension of the overlap period to 60• , which facilitates a fundamental redefinition of the working principles of the AAC. The EO-AAC has its dc current path decoupled from the ac current paths, a fact allowing 1) smooth dc current waveforms, 2) elimination of dc filters, and 3) restriction lifting on the feasible operating point. Analysis of this new mode and EO-AAC design criteria are presented and subsequently verified with tests on an experimental prototype. Finally, a comparison with other modular converters demonstrates that the EO-AAC is at least as power efficient as a hybrid modular multilevel converter (MMC) (i.e., a dc fault ride-through-capable MMC), while offering a smaller converter footprint because of a reduced requirement for energy storage in the submodules and a reduced inductor volume.Index Terms-AC-DC power conversion, active filters, capacitive energy storage, HVDC transmission, power system faults, power transmission protection.

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Section: A Alternate Arm Convertermentioning

confidence: 99%

“…The EO-AAC retains the property of the SO-AAC of being able to fully control the arm currents even in the presence of a dc-side short-circuit fault to the extent that it can operate as a STATCOM [34], [38], [39]. Fig.…”

Section: Dc-side Faultmentioning

confidence: 99%

The Extended Overlap Alternate Arm Converter: A Voltage-Source Converter With DC Fault Ride-Through Capability and a Compact Design

Merlin

Soto

Judge

et al. 2018

IEEE Trans. Power Electron.

Self Cite

122

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“…The Alternate Arm Converter (AAC) is another type of modular multilevel VSC that has been proposed for HVDC transmission applications [13], [14]. The AAC offers several benefits over the HB-MMC, such as comprising typically 30-40% fewer SMs [15], requiring approximately half the SM capacitance to yield a given SM capacitor voltage ripple [16], [17], and providing DC fault ride-through capability [18], [19]. In addition to each arm comprising a valve (formed by FB SMs) and an inductor, there is also a series-connection of self-commutated semiconductor devices with anti-parallel diodes, termed a Director Switch (DS).…”

Section: Introductionmentioning

confidence: 99%

“…A comparison of the HB-MMC, FB-MMC and AAC attributes is shown in Table I [1], [9], [13]- [19]. The nominal SM capacitor voltage is equal for all converters.…”

Section: Introductionmentioning

confidence: 99%

The Alternate Arm Converter “Extended-Overlap” Mode: AC Faults

Farr

Feldman

Clare

et al. 2021

IEEE Trans. Power Electron.

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This paper presents AC fault ride-through strategies for the "extended-overlap" operating mode of the Alternate Arm Converter (AAC), which is a type of modular multilevel Voltage Source Converter (VSC) that has been proposed for HVDC transmission applications. The AAC offers several benefits over the Half-Bridge (HB) Modular Multilevel Converter (MMC), such as requiring fewer Sub-Modules (SMs) with a smaller capacitance and providing DC fault ride-through capability. Novel symmetrical and asymmetrical AC fault ride-through strategies are described and these strategies are experimentally validated by using a Small Scale Prototype (SSP).

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“…Thereby research efforts have been made to propose either, MMC with different SM topologies allowing a DC-Fault tolerance while limiting the impact on power losses [3,4,5] One of these new topologies of VSC-HVDC with DC-Fault blocking capability is the Alternate Arm Converter which has been first published in 2010 [6]. The aim of this topology is to take the main strengths of the MMC and to improve the other features such as the DC-Fault tolerance and the converter footprint [7,8]. The converter is composed of three legs, six arms and each arm is made of a stack of Full-bridge SMs and a Director Switch (DS).…”

Section: Introductionmentioning

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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DC fault ride‐through capability and STATCOM operation of a HVDC hybrid voltage source converter

Cited by 27 publications

References 21 publications

The Extended Overlap Alternate Arm Converter: A Voltage-Source Converter With DC Fault Ride-Through Capability and a Compact Design

The Extended Overlap Alternate Arm Converter: A Voltage-Source Converter With DC Fault Ride-Through Capability and a Compact Design

The Alternate Arm Converter “Extended-Overlap” Mode: AC Faults

Energy and director switches commutation controls for the alternate arm converter

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