Impact of the DC technology on transmission grids

Spahic, E.; Schettler, F.; Varma, D.; Dorn, J.

doi:10.1049/cp.2015.0012

Cited by 12 publications

(11 citation statements)

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“…Whilst it has been suggested that the IGBTs in a full bridge SM should be blocked during a DC fault [7]- [10], full current control can still be achieved using appropriate control algorithms [5], [11]- [13]. It may be beneficial to maintain full control over the converter, in particular so that the SM capacitor voltages remain balanced and the converter remains ready to immediately resume power transfer.…”

Section: Feasibility Of DC Fault Responses For Fault Current Limimentioning

confidence: 99%

“…Given that the converters under consideration are capable of maintaining current control into a low voltage DC event such as a DC fault, the typical control action in the event of a DC fault would be to control the current to zero. Not feeding any fault current from the converter will allow any DC circuit breakers or disconnectors to operate under low stress conditions, and in the event of an overhead line fault de-ionisation will be allowed to occur [5].…”

Section: Control Current To Zeromentioning

confidence: 99%

“…When considering an HVDC network there are several strategies to protect against DC faults; AC circuit breaker isolation, implementing DC circuit breakers, or using fault current limiting converter topologies. Fault current limiting converters may lead to a significant reduction in the requirement for fast DC circuit breakers [4], and are also particularly attractive for systems implementing overhead lines where the rate of nonpermanent faults is relatively high [5].…”

Section: Introductionmentioning

confidence: 99%

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DC fault ride through of multilevel converters

Chaffey

Judge

Merlin

et al. 2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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Modular Multilevel Converters (MMC) can provide significant advantages for power transmission applications, however there are remaining challenges trading off DC fault response, losses and controllability. Alternative multilevel converter topologies using combinations of full bridge and half bridge submodules or series switches allow for competitive efficiency whilst retaining control over the DC fault current. Several possible fault responses are analysed to evaluate appropriate converter control actions. Experimental results from a 60 submodule 15 kW demonstrator are presented to validate the DC fault performance of the full bridge MMC, the mixed stack MMC and the alternate arm converter. It is shown that each can control the current into a low impedance DC fault, and there no requirement to block the semiconductor devices.

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Section: Feasibility Of DC Fault Responses For Fault Current Limimentioning

confidence: 99%

Section: Control Current To Zeromentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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DC fault ride through of multilevel converters

Chaffey

Judge

Merlin

et al. 2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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“…Various converter typologies with DC fault blocking capability were presented in [18] and [19]. The blocking capability of the converter is exploited to control the DC current by inserting negative voltages or to interrupt it by blocking all converters in the grid [20]. As the required time to insert negative voltages by the submodules (to control the DC current) or to turn off the submodules (to interrupt the DC fault current) is within 1-2 ms, the fault current interruption is in the range of 1-2 ms as well [21].…”

Section: Non-selective Protection Strategy Using Converters With DC Fmentioning

confidence: 99%

Impact of DC grid contingencies on AC system stability

Abedrabbo

Wang²,

Tielens³

et al. 2017

13th IET International Conference on AC and DC Power Transmission (ACDC 2017)

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In order to reliably and safely operate future multi-terminal HVDC grids, different protection strategies are currently being developed and presented in the literature. Especially for large DC grids, it is important to investigate how the choice of the protection strategy influences AC system stability during DC fault clearance and system restoration. This paper contributes to the understanding of these issues by giving an overview of the different protection strategies and their influence on frequency and transient stability. DC grid protection requirements are defined, based on the AC system constraints related to the level and duration of power transfer loss.

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“…Already, first European countries, such as Germany, schedule HVDC overhead line corridors within the interconnected alternating current (AC) grid [1, 2]. After the integration of single HVDC corridors in the existing AC structure as point to point systems, a further development of these corridors to multiterminal systems is intended [1, 3, 4].…”

Section: Introductionmentioning

confidence: 99%

Application of multilevel full bridge converters in HVDC multiterminal systems

Petino

Heidemann

Eichhoff

et al. 2016

IET Power Electronics

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The worldwide demand for flexible transmission grids leads to an increasing interest in high voltage direct current (HVDC)-voltage source converter systems resulting to the planning of radial and interconnected HVDC multiterminal grids. Since HVDC multiterminal systems have high requirements on control and protection, modular multilevel converter with full bridge (FB) submodules can be applied, preventing the handling of high fault current amplitudes. However, the feasibility of multiterminal HVDC systems utilising FB submodules has to be evaluated against the general background of selective fault handling and velocity of the fault clearing process. These necessary investigations are presented within this contribution, carried out by use of an appropriate simulation model in PSCAD tm / EMTDC tm. Thereby, requirements for protection concepts and protective devices for multiterminal systems can be further formulated. Three different variations of a protection concept have been investigated, which differ in the degree of communication structure between the converter stations and protective devices. These scenarios contain approaches with no communication, minimum communication and full communication.

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Impact of the DC technology on transmission grids

Cited by 12 publications

References 0 publications

DC fault ride through of multilevel converters

DC fault ride through of multilevel converters

Impact of DC grid contingencies on AC system stability

Application of multilevel full bridge converters in HVDC multiterminal systems

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