EPE Association: EPE 2021 - HVDC and MVDC systems

EPE 2021 - HVDC and MVDC systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2021 ECCE Europe - Conference > EPE 2021 - Topic 07: Power Supplies > EPE 2021 - HVDC and MVDC systems

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   Break-even distance for MVDC electricity networks according to power loss criteria
By Pierre LE METAYER [View]
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Abstract: The medium voltage direct current (MVDC) technology is emerging in electricity networks includingpoint-to-point transmission, distribution networks and collection networks for renewable energysources. In this article the MVDC break-even distance (with respect to AC distribution) is calculatedaccording to the overall energy efficiency criteria. The break-even distance is found to vary from lessthan 10 km to several tens of kilometers depending on power and voltage ratings and network topology.

   Methodology to obtain the specifications and perform the sizing of a power flow controller for meshed HVDC grids
By Joan SAU BASSOLS [View]
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Abstract: Power flow controllers (PFC) or current flow controllers (CFC) are expected to be required in futureHVDC grids to control the current flows and avoid congestions. This work proposes a methodology toobtain the specifications, select the most suitable converter structure and perform the sizing of aninterline PFC. Then, the methodology is applied to a real HVDC grid case study, obtaining thespecifications, the selected converter structure and the sizing of the power electronic elements and the passive components. The results show that the PFC is a medium voltage converter with high current rating requiring some switches in series and interleaved branches. With such a series/parallelassociation, the main elements of the converter are available on the market except for the inductances which can be manufactured on-demand without major technical locks.

   Modelling and Control of an MMC-HVDC Submodule with Energy Storage for Fast Frequency Response
By Florian ERRIGO [View]
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Abstract: Recent works have shown that energy storage systems (ESSs) can be distributed in a modular multilevel converter (MMC) for the enhancement of high voltage direct current (HVDC) converter stations in order to provide ancillary services. In this case, DC-DC converters are compulsory to interface energy storage elements to submodule (SM) capacitors. However, the choice of the converter topology and its control is not straightforward due to the complex working principle of an MMC. This paper proposes a suitable interface converter with a control strategy to address these issues. Special emphasis is put on the modelling of the converter to highlight all the interactions inside a SM and ease the design of the controllers. To conclude, a downscaled prototype validates the effectiveness of the proposed solution.

   Testing of an HVDC IED Prototype Using Field Recordings
By Ilka JAHN [View]
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Abstract: Testing of protection intelligent electronic devices (IEDs) for high-voltage direct-current (HVDC) systems is usually constrained to simulated HVDC faults because systematic testing with faults on full-scale HVDC systems is not feasible. However, all simulations are subject to inaccuracies. In this paper, an HVDC IED prototype is tested with real fault recordings from an operational point-to-point HVDC link. Firstly, the successful response of the prototype HVDC IED to fault recordings from a real system is presented. Secondly, the behaviour of different protection algorithms and filters is analysed, leading to conclusions about the applicability in a real system. The results are useful because the gained knowledge is based on both a real prototype HVDC IED and a real fault recording, and not a simulation.

EPE 2021 - HVDC and MVDC systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2021 ECCE Europe - Conference > EPE 2021 - Topic 07: Power Supplies > EPE 2021 - HVDC and MVDC systems
	[return to parent folder]

	Break-even distance for MVDC electricity networks according to power loss criteria By Pierre LE METAYER	[View] [Download]
Abstract: The medium voltage direct current (MVDC) technology is emerging in electricity networks includingpoint-to-point transmission, distribution networks and collection networks for renewable energysources. In this article the MVDC break-even distance (with respect to AC distribution) is calculatedaccording to the overall energy efficiency criteria. The break-even distance is found to vary from lessthan 10 km to several tens of kilometers depending on power and voltage ratings and network topology.

	Methodology to obtain the specifications and perform the sizing of a power flow controller for meshed HVDC grids By Joan SAU BASSOLS	[View] [Download]
Abstract: Power flow controllers (PFC) or current flow controllers (CFC) are expected to be required in futureHVDC grids to control the current flows and avoid congestions. This work proposes a methodology toobtain the specifications, select the most suitable converter structure and perform the sizing of aninterline PFC. Then, the methodology is applied to a real HVDC grid case study, obtaining thespecifications, the selected converter structure and the sizing of the power electronic elements and the passive components. The results show that the PFC is a medium voltage converter with high current rating requiring some switches in series and interleaved branches. With such a series/parallelassociation, the main elements of the converter are available on the market except for the inductances which can be manufactured on-demand without major technical locks.

	Modelling and Control of an MMC-HVDC Submodule with Energy Storage for Fast Frequency Response By Florian ERRIGO	[View] [Download]
Abstract: Recent works have shown that energy storage systems (ESSs) can be distributed in a modular multilevel converter (MMC) for the enhancement of high voltage direct current (HVDC) converter stations in order to provide ancillary services. In this case, DC-DC converters are compulsory to interface energy storage elements to submodule (SM) capacitors. However, the choice of the converter topology and its control is not straightforward due to the complex working principle of an MMC. This paper proposes a suitable interface converter with a control strategy to address these issues. Special emphasis is put on the modelling of the converter to highlight all the interactions inside a SM and ease the design of the controllers. To conclude, a downscaled prototype validates the effectiveness of the proposed solution.

	Testing of an HVDC IED Prototype Using Field Recordings By Ilka JAHN	[View] [Download]
Abstract: Testing of protection intelligent electronic devices (IEDs) for high-voltage direct-current (HVDC) systems is usually constrained to simulated HVDC faults because systematic testing with faults on full-scale HVDC systems is not feasible. However, all simulations are subject to inaccuracies. In this paper, an HVDC IED prototype is tested with real fault recordings from an operational point-to-point HVDC link. Firstly, the successful response of the prototype HVDC IED to fault recordings from a real system is presented. Secondly, the behaviour of different protection algorithms and filters is analysed, leading to conclusions about the applicability in a real system. The results are useful because the gained knowledge is based on both a real prototype HVDC IED and a real fault recording, and not a simulation.