Impacts of Three MMC-HVDC Configurations on AC System Stability Under DC Line Faults

Tang, Geng; Xu, Zheng; Zhou, Yutian

doi:10.1109/tpwrs.2014.2315666

Cited by 145 publications

(70 citation statements)

References 13 publications

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“…For more information, see http://creativecommons.org/licenses/by/3.0/ point (i.e.,V AC = 2 π V DC ). 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%

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.

119

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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 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.

119

View full text Add to dashboard Cite

show abstract

“…In the absence of an appropriate control strategy, this fault may lead the electrical installations to a significant material damage in. For this, several research studies have begun in this area to resolve the problematic of the AC and DC faults [27][28][29][30]. The majority of these studies have shown an improvement in the quality of energy in the presence of a fault while mitigating the impact on the system, but the response time and amplitude of the measured variables remain higher.…”

Section: Scenario Iii: DC Faultmentioning

confidence: 99%

Adaptive Sensorless Control of PMSGs-Based Offshore Wind Farm and VSC-HVdc Stations

Benadja

Chandra

2015

IEEE J. Emerg. Sel. Topics Power Electron.

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“…The operation of the MMC during unbalanced AC [12], [13] and DC [12], [14] grid conditions has also been studied. The specific case of the singular voltage condition, where positive and negative sequence of the AC grid voltages are equal, is highly problematic as it may result in singularities in the calculation of current references.…”

Section: Introductionmentioning

confidence: 99%

Control of Modular Multilevel Converters Under Singular Unbalanced Voltage Conditions With Equal Positive and Negative Sequence Components

Prieto‐Araujo

Junyent-Ferré

Clariana-Colet³

et al. 2017

IEEE Trans. Power Syst.

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Abstract-This article focuses on the control of Modular Multilevel Converters (MMC) for High Voltage DC (HVDC) applications during unbalanced AC grid voltage sags where positive and negative sequence voltages are equal. The control scheme is based on six arm energy regulators, six independent current controllers and two reference calculation stages that convert the power references into grid and inner current references. Conventional inner AC currents reference calculation fails if the amplitude of the positive and the negative sequence AC grid voltages are equal, a state which is referred to in this paper as singular voltage condition. This article discusses the types of network faults that cause this condition and proposes three different solutions to operate the converter in such scenarios. The adequacy of the proposed solutions is validated through simulations considering each of the problematic fault scenarios.

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Impacts of Three MMC-HVDC Configurations on AC System Stability Under DC Line Faults

Cited by 145 publications

References 13 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

Adaptive Sensorless Control of PMSGs-Based Offshore Wind Farm and VSC-HVdc Stations

Control of Modular Multilevel Converters Under Singular Unbalanced Voltage Conditions With Equal Positive and Negative Sequence Components

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