Fiche individuelle
Guillaume DENIS | ||
Titre | Doctorant | |
Equipe | Réseaux | |
Téléphone | +33 (0)3-XX-XX-XX-XX | |
guillaume.denis@ec-lille.fr | ||
Observation / Thématique de recherche | Système électrique | |
Publications |
ACLI Revue internationale avec comité de lecture |
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[1] Critical clearing time determination and enhancement of grid-forming converters embedding virtual impedance as current limitation algorithm IEEE Journal of Emerging and Selected Topics in Power Electronics, 12/2019, URL, Abstract QORIA Taoufik, GRUSON François, COLAS Frédéric, DENIS Guillaume, PREVOST Thibault, GUILLAUD Xavier |
The present paper deals with the post-fault synchronization of a voltage source converter based on the droop control. In case of large disturbances on the grid, the current is limited via current limitation algorithms such as the virtual impedance. During the fault, the power converter internal frequency deviates resulting in a converter angle divergence. Thereby, the system may lose the synchronism after fault clearing and which may lead to instability. Hence, this paper proposes a theoretical approach to explain the dynamic behavior of the grid forming converter subject to a three phase bolted fault. A literal expression of the critical clearing time is defined. Due to the precise analysis of the phenomenon, a simple algorithm can be derived to enhance the transient stability. It is based on adaptive gain included in the droop control. These objectives have been achieved with no external information and without switching from one control to the other. To prove the effectiveness of the developed control, experimental test cases have been performed in different faulted conditions. |
ACT Conférence internationale avec acte |
[1] Power Converters Classification and Characterization in Power Transmission Systems EPE'19, 09/2019, Abstract QORIA Taoufik, PREVOST Thibault, DENIS Guillaume, GRUSON François, COLAS Frédéric, GUILLAUD Xavier |
Because of the throng of control strategies based Voltage Source Converters (VSC) recently proposed
in the literature; their classification and characterization are becoming a trending topic. The high
similarities of the proposed control strategies may lead to confusions and a misunderstanding of
vocabulary. Therefore, this paper seeks first to highlight the possible features fulfilled by power
converters in a large power system. The combination of these features is used to classify power
converters. Furthermore, power converters can be seen by a power transmission system operators as
black boxes, and they may have the same inputs and outputs, which makes their characterizations
more difficult. This paper looks to show that only the fundamental nature of the source has an
influence on the system dynamic behavior, thus, power converter can be characterized from their
transient behavior in response to grid disturbances. |
[2] Inertia effect and load sharing capability of grid forming converters connected to a transmission grid 15th ACDC19, 02/2019, Abstract QORIA Taoufik, GRUSON François, COLAS Frédéric, DENIS Guillaume, PREVOST Thibault, GUILLAUD Xavier |
The virtual synchronous machine concept (VSM) has been developed initially to reproduce the synchronous machine stabilizing effect by providing inertia with the emulation of swing equation, whereas droop control is developed initially to ensure load sharing and has no inertia. An introduction of a low pass filter to droop control has been motivated to filter the active power measurement and ensures a time decoupling with the inner control loops, whereas, this low-pass filter can also provide inertia to the system. This functionality is limited due to its negative impact on the active power dynamic. This paper proposes an analysis of the conventional droop control by showing its limitations and proposes an improved inertial droop control that allows providing the inertia to the system and ensures a good dynamic behavior of the active power at once in simple manner, and without modifying the load sharing capability. The results obtained are compared to the conventional method (Droop control and VSM) in various topologies in order to show the relevance of the proposed method. |
[3] Improving Robustness against Grid Stiffness, with Internal Control of an AC Voltage-Controlled VSC Conférence, 11/2016, Abstract DENIS Guillaume, KESTELYN Xavier, GUILLAUD Xavier, PREVOST Thibault, PANCIATICI Patrick, COLAS Frédéric |
Voltage Source Converter-based transmission grids
might be the future of power system with the increasing share of
interfaced electricity generation. These systems should be able to
support the utility grid autonomously. The present paper focuses
on the VSC output filter design and internal control of filter
states. Nested AC current and voltage loops are the state of the
art for power converters, controlled as voltage sources, in
Microgrid or UPS applications. These internal controls are
candidates for future industrial implementation at high power
level. However, in a VSC based transmission system, those
controls will face various topologies while requiring robustness
against transient events (load changes, line tripping, etc.). The
following development aims at providing keys for designing a
versatile internal control suitable for VSC-based transmission
system. |
[4] Internal Control Stability Assessment Method of a VSC-based transmission
grid Conférence, 10/2016, Abstract DENIS Guillaume, KESTELYN Xavier, GUILLAUD Xavier, COLAS Frédéric, PREVOST Thibault, PANCIATICI Patrick |
The multiplication of interfaced generation units connected to the utility grid might form VSC-based
transmission grids in a near future. To support the utility grid autonomously, the converters must
provide grid-forming capabilities and be connected in parallel. As the structure of a transmission grid
is changing and unknown, these requirements presume a robust local voltage control for each highpower
VSC, to face various network topologies. Indeed, the stability is challenged when voltagecontrolled
VSCs are close to each other, namely, when the tie-impedance is low. The present
contribution describes an impedance-based criterion method as a convenient and effective tool for
assessing the stability of the voltage control of converters in a VSC-based transmission grid. The
method is successfully applied to a typical two-VSC system to anticipate unstable situations |
[5] Review on Potential Strategies for Transmission System Based on Power Electronics Interfaced Voltage Sources IEEE PES GENERAL MEETING, 07/2015, URL, Abstract DENIS Guillaume, PREVOST Thibault, PANCIATICI Patrick, KESTELYN Xavier, COLAS Frédéric, GUILLAUD Xavier |
In the near future, transmission grids will include an increasing share of directly connected voltage source converters. These systems should be able to support the utility grid autonomously. The present paper reviews the most popular approaches to address the challenge of proper load sharing amongst multiple parallel inverters applied to the utility grid case. Originally developed for Microgrid or UPS applications, these decentralized controls mimic a conventional synchronous generator based system steady-state behavior and showed suitable effectiveness to reach the desired operating point. However, the operations at the transmission grid level bring additional stress on the converters and require transient capabilities. Physical limitations of semi-conductor based converters fundamentally differ from a conventional synchronous generator. Therefore the paper illustrates how the usual real power controls may lead to undesirable behavior during transient events. This raises new issues for reliable operations of interconnected VSCs at transmission level. |
TH Thèse |
[1] Déduction et mise en œuvre de stratégies de commande de réseaux électriques sans machines synchrones Centrale Lille, 11/2017, URL, Abstract DENIS Guillaume |
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