Alternate arm converter operation of the modular multilevel converter

Merlin, Michaël M. C.; Judge, Paul D.; Green, T. C.; Mitcheson, Paul D.; Moreno, F. Javier; Dyke, Kevin J.

doi:10.1109/ecce.2014.6953654

Cited by 21 publications

(14 citation statements)

References 13 publications

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“…(9). But the derivation of that equation was made assuming that "no harmonic current is circulating in the arms" [15]. In our simulation, no Circulating Current Suppression Controller has been used and therefore this hypothesis is not valid.…”

Section: Influence Of the Coupled Inductors On The Circulating Curmentioning

confidence: 98%

Transient analysis of a modular multilevel converter with coupled arm inductors

Dzonlaga

Joca

Quéval

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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The influence of the coupling of the arm inductors of a modular multilevel converter has been investigated through transient simulations. In particular, positive, negative and zero coupling coefficient were considered for both steady-state and transient operating conditions. The effect of the coupling on the transient response, the capacitor voltage ripple, the circulating current, the DC short-circuit current and the switch power losses has been closely examined. The possibility to reduce either the circulating current or the DC short-circuit current has been demonstrated, opening the door to improved performances of modular multilevel converter with only minor modifications.

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Section: Influence Of the Coupled Inductors On The Circulating Curmentioning

confidence: 98%

Transient analysis of a modular multilevel converter with coupled arm inductors

Dzonlaga

Joca

Quéval

et al. 2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…If the upper arm is to be cut off by switching off DS upper_arm at the end of 2α, then the ZCS control is applied, leading to (19) and (20), respectively, to achieve soft switching of DS upper_arm by letting i cir = −i g_ac /2 as shown in the equation below:…”

Section: Zcs Controlmentioning

confidence: 99%

“…i upper_arm = 0 (19) i lower_arm = − i g_ac (20) Conversely, if the lower arm is to be cut off by switching off DS lower_arm at the end of 2α, then the ZCS control is implemented to modify (16) and (17) into (22) and (23), respectively, to achieve soft switching of DS lower_arm by letting i cir = +i g_ac /2 as shown in the equation below:…”

Section: Zcs Controlmentioning

confidence: 99%

“…Therefore, the AAC requires lower number of cells; hence, the size and losses of the AAC are lower compared with the MMC [13,17]. The major advantages of the AAC include the number of SMs or cells per arm is greatly reduced (∼50% compared with the MMC) and the ability to block DC-side faults, as well as to ride through AC-side faults in each SM as mentioned in [12,13,[18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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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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“…From a design perspective, each AAC arm requires fewer submodules as it operates over only half of the voltage range of other MMC configurations [17]. The insertion of a single arm in the conduction path at any given time reduces losses compared to existing topologies [18, 19] while also eliminating any path for circulating currents to flow [17].…”

Section: Introductionmentioning

confidence: 99%