Model and control of the DC–DC modular multilevel converter with DC fault tolerance

Gruson, François; Tlemcani, Amine; Li, Yafang; Delarue, Philippe; Moigne, Philippe Le; Guillaud, Xavier

doi:10.1080/09398368.2020.1750847

Cited by 3 publications

(11 citation statements)

References 16 publications

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“…The AC grid at each terminal is considered ideal and modelled with an AC voltage source with series impedance. Front-to-Front MMC (F2F-MMC) topology is considered for DC/DC converter 13 as it is the most studied and known topology in literature. Grid 1 is a 640kV network formed by two stations where MMC11 is in voltage droop control mode with droop coefficient k dr1 and MMC12 in power control mode, connected through a cable of 300km length.…”

Section: Representation Of Mtdc Systemmentioning

confidence: 99%

“…Whereas, the AC current is controlled differently as both sides are coupled with transformer and there is no external AC grid. Thus, we adopt the control scheme presented in 22,13 , where one MMC of the DC/DC converter fixes its AC voltage and the other MMC is responsible for power flow, thereby, controlling the AC current. The AC voltage of the primary side MMC of DC/DC converter (connected to DC grid 1) is fixed to the value v dc1 /2, which is the optimal operating point 23 .…”

Section: 2mentioning

confidence: 99%

“…Reference 12 presents the case where DC/DC converter is used for the interconnection of LCC and VSC-based HVDC links. Besides working in normal operation, the fault-blocking capability and operation of DC/DC converters under DC faults have also been presented in some research studies 13,14,15 . Few publications have also presented the multi-port DC/DC converter topologies to connect multiport HVDC network 16,17 .…”

Section: Introductionmentioning

confidence: 99%

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Small Signal Analysis of DC Voltage Control Based on a Virtual Resistance of DC/DC converter Integrated in a Multiterminal DC Grid

Shafique,

boukhenfouf,

Gruson

et al. 2023

Preprint

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<p>The future multi-terminal direct-current (MTDC) grid will require the interconnection of point-to-point highvoltage (HV) DC links with different specifications such as DC voltage level, system grounding configuration and HVDC technology. To adapt these differences, DC/DC converters are mandatory to interconnect HVDC links. Additionally, they are capable of providing supplementary functions as they are highly controllable devices. In this paper, a primary virtual resistance DC voltage controller associated with DC/DC converter is proposed for managing DC grid voltages of the interconnected HVDC grids, increasing the reliability of the system. The commonly known topology, Front-to-Front Modular Multilevel Converter (F2FMMC) is adopted for DC/DC converter. Time-domain simulation are performed using EMTP software for validating the controller behaviour under power disturbances and large event of loss of one converter in a MMC based MTDC system. All converters are modelled using reduced order modelling (ROM) methodology. Apart from this, dynamic studies have been carried out using linear state space model for small-signal stability analysis of a HVDC system integrating DC/DC converter with virtual resistance DC voltage controller. The </p>

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Section: Representation Of Mtdc Systemmentioning

confidence: 99%

Section: 2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Small Signal Analysis of DC Voltage Control Based on a Virtual Resistance of DC/DC converter Integrated in a Multiterminal DC Grid

Shafique,

boukhenfouf,

Gruson

et al. 2023

Preprint

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“…The calculation of the inertia time constant of the AC system is extended to the DC system. It is known that the inherent inertia time constant of the DC system is the time taken from the energy stored in the DC-side capacitor at the rated voltage to its complete consumption, and the inertia time constant of the system after adding the virtual inertia control is as shown in Equation (27).…”

Section: Time Constant Of Inertiamentioning

confidence: 99%

“…Converters can be classified as three-phase twolevel converters, three-level NPC converters, multilevel converters, modular multilevel converter (MMC), etc. The modeling methods of converters are also numerous, such as [22][23][24][25][26][27]: the improved mean value model proposed based on the mean value model, which can accurately simulate converter blocking and severe AC and DC fault conditions; the discrete time model can clearly describe the state trajectory in all subintervals of converter operation, which can provide accurate solutions for AC state variables; and the small-signal model which can enable the components to work in the nonlinear region with the existing linear means. The small-signal model enabled the study of components operating in the nonlinear region, simplifying the process of analyzing the problem.…”

Section: Introductionmentioning

confidence: 99%

A Virtual Inertia Method for Stability Control of DC Distribution Systems with Parallel Converters

et al. 2022

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DC distribution systems are a typical power electronic system with low inertia, low-rotational kinetic energy, and poor antidisturbance capability when loads fluctuate or parameters change. In this paper, a virtual inertia control with an additional first-order filtering link is proposed on the basis of P-Udc droop control. The results of the simulations and experiments verify that the additional inertia control reduces the voltage change rate and improves the system inertia by adjusting the virtual capacitance value on the DC side of the converter, which can achieve a smoother and more accurate voltage control and suppress the continuous voltage oscillation.

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Reduce Order Modeling of the modular multilevel DC/DC converter (M2DC) for HVDC grid

Shafique,

Boukhenfouf,

Gruson

et al. 2023

2023 25th European Conference on Power Electronics and Applications (EPE'23 ECCE Europe)

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The Modular Multi-Level DC-DC Converter (M2DC) is an attractive non-isolated DC-DC converter topology for HVDC grid. In order to carry out MTDC grid stability studies, the development of reduce order models of converters is necessary. This article first presents the M2DC converter. Then, the reduce order model will be developed in the second part. The development of the control of this model will be carried out in the third part. Atlast, the comparison of the reduce order model and its control with the average arm model will be performed in the later section of the paper.The upper and lower arm are precised with the subscript "u" and "l". P *Reference power on low-voltage side C SM u ;C SM l Capacity of sub-modules C totu ;C totl Equivalent capacity of arm i sCurrent on low-voltage side i dif f Differential current

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Model and control of the DC–DC modular multilevel converter with DC fault tolerance

Cited by 3 publications

References 16 publications

Small Signal Analysis of DC Voltage Control Based on a Virtual Resistance of DC/DC converter Integrated in a Multiterminal DC Grid

Small Signal Analysis of DC Voltage Control Based on a Virtual Resistance of DC/DC converter Integrated in a Multiterminal DC Grid

A Virtual Inertia Method for Stability Control of DC Distribution Systems with Parallel Converters

Reduce Order Modeling of the modular multilevel DC/DC converter (M2DC) for HVDC grid

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