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Phd Guilherme DANTAS DE FREITAS “Development of a methodology for DC grid protection strategies comparison”

Communications2021-08-11T17:42:24+02:00October 18th, 2019|Architecture & systèmes du supergrid, Phd|

High Voltage Direct Current (HVDC) grids are considered a promising solution for problems faced by nowadays power system such as: lines congestion, integration of large amounts of renewable power and enhancement of AC system stability. Among the challenges in the deployment of a HVDC meshed grid, the protection of these grids is regarded as one of the most critical. The protection of HVDC grid is challenging not only because the swift transients and fault currents without zero-crossing, but also due to the impact a DC faults can have on the AC system. Several propositions for HVDC grids protection strategies can be found in literature....

3-phase medium frequency transformer for a 100kW 1.2kV 20kHz Dual Active Bridge converter

Communications2021-08-11T16:43:20+02:00October 15th, 2019|Electronique de puissance & convertisseurs, Publications|

The article presents a three-phase Medium Frequency Transformer being a part of a 100kW 1.2kV 20kHz Dual Active Bridge DC-DC converter. The transformer design is detailed focusing on winding and core power loss calculation. The high power three-phase MFT prototype is presented. The experimental results include the transformer impedance characteristics, no load test and three-phase DAB full load test waveforms.

Cost-performance framework for the assessment of Modular Multilevel Converter in HVDC transmission applications

Communications2021-08-11T16:43:30+02:00October 15th, 2019|Electronique de puissance & convertisseurs, Publications|

This article proposes a methodology of Cost-Performance Assessment (CPA) enabling the efficient cost evaluation required for the Cost-Benefit Analysis (CBA). The proposed method is applied for the Modular Multilevel Converter (MMC) in offshore wind high voltage direct current (HVDC) transmission. Thanks to the developed model, an analysis of submodule voltage rating is performed demonstrating the interest of this methodology in the evaluation of new technologies for HVDC transmission. The analysis shows that increasing the submodule (SM) voltage could lead to savings in the MMC cost and weight.

Requirements for interconnection of HVDC links with DC-DC converters

Communications2021-08-11T16:43:38+02:00October 15th, 2019|Electronique de puissance & convertisseurs, Publications|

The number of high voltage direct current (HVDC) links continue to increase over the years, most of them, for offshore applications or bulk power transmission over long distances. The present paper evaluates the possible development of a direct current (dc) grid in Europe given the present, and future, HVDC links. Eight potential cases for the interconnection between close links are suggested as starting scenario for a multiterminal network. The need of a dc-dc converter and its special requirements are evaluated in function of suggested interconnections. As an example, a case study is chosen to evaluate the behavior of an interconnection between line commutated converter (LCC) and voltage source converter (VSC) link using a front-to-front (F2F) isolated converter.

Assessment of the Impact of Split Storage within Modular Multilevel Converter

Communications2021-08-11T16:43:46+02:00October 15th, 2019|Electronique de puissance & convertisseurs, Publications|

This paper deals with the opportunities to introduce split storage into an MMC. The analysis is focused on the internal energy exchange to maintain the proper function of the converter by using circulating current. Analysis shows that, SM capacitor voltage ripple or semiconductors load are greatly influenced by additional circulating current injection. This study helps to design Embedded ESSs in the converter to provide new function like ancillary services for power system operation. Finally, a simulation of an MMC with ESS confirms analytical calculations.

SuperGrid Institute at “Fête de la Science”: come and discover the electricity network of tomorrow

Communications2022-11-30T10:44:27+01:00October 10th, 2019|Evenement|

The thinking caps are on this week at SuperGrid Institute with the “Fête de la Science” event! Over the last few days the institute has welcomed four classes of high school students who learnt about the work that we do through fun, interactive activities. This Saturday afternoon, we are opening our doors to the public to round of the week in style! Come along and see us!

SuperGrid Institute at “Fête de la Science”: come and discover the electricity network of tomorrow

Communications2022-11-30T10:45:26+01:00October 10th, 2019|Evenement|

The thinking caps are on this week at SuperGrid Institute with the “Fête de la Science” event! Over the last few days the institute has welcomed four classes of high school students who learnt about the work that we do through fun, interactive activities. This Saturday afternoon, we are opening our doors to the public to round of the week in style! Come along and see us!

Ahmed Zama honored with the IEEE “Doctorate Laureate” for his thesis work

Communications2023-01-31T13:33:14+01:00October 10th, 2019|Architecture & systèmes du supergrid, Evenement|

Every year the French chapter of IEEE Power & Energy Society (PES), in collaboration with SEE (Society of Electricity, Electronics and Information and Communication Technologies), recognises outstanding PhD theses and hands out the “outstanding engineer of the year” prize at an annual evening ceremony. This Wednesday the 9th of October, Ahmed Zama was honoured with the IEEE “Doctorate Award” for his thesis work on “Modeling and Control of Modular Multilevel Converters (MMCs) for HVDC applications”.

Use of Unbalanced Insulation for the Limitation of Double-Pole Lightning Flashovers in Double Circuit HVDC Overhead Lines

Communications2023-01-31T13:32:29+01:00October 7th, 2019|Tout|

Lightning studies are a critical part of any system involving overhead lines. As HVDC technologies develop, new problems and questions arise regarding the lightning performance of HVDC overhead lines. For instance, the installation of two separate HVDC circuits on the same transmission tower may become a popular alternative for the uprating of old AC lines to take advantage of the already existing Right-of-Ways. Double-pole flashovers may be particularly constraining in double circuit HVDC systems, since they could lead to the loss of both circuits at the same time due to the flashover of both poles of the same polarity having the same amplitude at all times (which is not the most likely case in AC systems). This corresponds to a 100% of loss of transmitted power, which could represent a threat for the system stability. This constitutes the main motivation for this work.

Use of Unbalanced Insulation for the Limitation of Double-Pole Lightning Flashovers in Double Circuit HVDC Overhead Lines

Communications2021-08-11T16:43:54+02:00October 7th, 2019|Architecture & systèmes du supergrid, Publications|

Lightning studies are a critical part of any system involving overhead lines. As HVDC technologies develop, new problems and questions arise regarding the lightning performance of HVDC overhead lines. For instance, the installation of two separate HVDC circuits on the same transmission tower may become a popular alternative for the uprating of old AC lines to take advantage of the already existing Right-of-Ways. Double-pole flashovers may be particularly constraining in double circuit HVDC systems, since they could lead to the loss of both circuits at the same time due to the flashover of both poles of the same polarity having the same amplitude at all times (which is not the most likely case in AC systems). This corresponds to a 100% of loss of transmitted power, which could represent a threat for the system stability. This constitutes the main motivation for this work.

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