Dynamic Internal Overcurrent Control for Undetected DC Faults for Modular Multilevel Converters

Ruffing, Philipp; Schnettler, Armin; Petino, Cora

doi:10.1049/cp.2017.0070

Cited by 6 publications

(7 citation statements)

References 0 publications

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“…The control principles of FB MMC HVDC are more complex than with HB MMC, but studies and performance have been demonstrated on simulation models [7]- [9]. These studies confirm steady-state performance and propose control options for DC faults, but they are concerned solely with 2-terminal HVDC systems.…”

Section: Introductionmentioning

confidence: 87%

“…FB MMC has an additional controllability compared with HB MMC which can be exploited to regulate one variable on the DC side [7], [9]. Fig.…”

Section: Full Bridge MMC Controllermentioning

confidence: 99%

“…It is also important that FB MMC employs an arm voltage controller, which is continuously balancing internal MMC energy. Energy balancing may override DC current control in order to prevent dangerous arm voltage levels [7] [9].…”

Section: Full Bridge MMC Controllermentioning

confidence: 99%

“…In recent years some research has been directed on developing FB (Full Bridge) MMC converters [5]- [9]. FB MMC is immune to DC faults, and it can prevent DC fault propagation either by blocking the converter or by controlling the DC current [1].…”

Section: Introductionmentioning

confidence: 99%

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Low-Energy Protection System for DC Grids Based on Full-Bridge MMC Converters

Jovcic

Lin

Nguefeu

et al. 2018

IEEE Trans. Power Delivery

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This paper studies protection and control methods for a large DC grid based solely on Full Bridge MMC (Modular Multilevel) converters. An initial theoretical study concludes that DC CB energy dissipation will depend on inductance and square of fault current but not on protection operating time. It is proposed to use differential protection because of robust selectivity and also since it operates well with small series inductors. The analysis of DC CB dissipated energy leads to new protection logic design that delays tripping signals until local current reduces to low values. Low speed DC Circuit Breakers with very small inductors are adequate. The design of controllers for MMC converters should be coordinated with DC grid protection and the study derives values for current controller references. The fault recovery time is found to depend on current reference settings at MMC terminals, and optimal values are derived. The conclusions are confirmed using EMTP simulation on a 400kV, 4-MMC DC grid considering two topologies: with 5 overhead lines and with 5 DC cables.

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Section: Introductionmentioning

confidence: 87%

“…FB MMC has an additional controllability compared with HB MMC which can be exploited to regulate one variable on the DC side [7], [9]. Fig.…”

Section: Full Bridge MMC Controllermentioning

confidence: 99%

Section: Full Bridge MMC Controllermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Low-Energy Protection System for DC Grids Based on Full-Bridge MMC Converters

Jovcic

Lin

Nguefeu

et al. 2018

IEEE Trans. Power Delivery

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“…Module redundancy controllers are specific for this kind of power converter and operate by residual values obtained by calculating the difference between measured and observed variables. If some modules/stages fail, a supervisory control uses fault-tolerant reconfiguration to maintain continuous operation [45][46][47][48][49][50][51][52][53][54][55][56][57][58]. A particular scenario is presented with asymmetric converters.…”

Section: General Classificationmentioning

confidence: 99%

An Overview on Fault Management for Electric Vehicle Onboard Chargers

et al. 2022

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Onboard charging systems (OBCs) convert AC power from an external charging source into a DC voltage used to charge the battery pack of an electric vehicle (EV). OBCs are versatile since they can convert energy from almost every AC source, including standard household electrical receptacles, without needing wall chargers or charging stations. Since the same motor-drive electronics are reconfigured for onboard charging, weight and cost barely increase. However, the power quality and reliability of the OBCs are essential elements for proper grid interconnection. This article reviews the failures of power electronic converters that can be used for onboard charging and their most prominent fault-tolerance techniques. The various fault-tolerance methods are evaluated and compared in terms of complexity, cost, and performance to provide insights for future developments and research directions.

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