Dual Channel Control With DC Fault Ride Through for MMC-Based, Isolated DC/DC Converter

Jovcic, Dragan; Zhang, Huibin

doi:10.1109/tpwrd.2017.2675909

Cited by 48 publications

(24 citation statements)

References 15 publications

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“…, are the upper and the lower average arm powers generated by the above defined DC components. They have opposite values: (4) Unlike MMC, these powers are not zero in steady state, as they are proportional to power and ratio α (ratio between the voltages and ) as presented in (4). The energy stored in the M2DC arms cannot remain stable naturally as the average powers in each arm are not equal to zero.…”

Section: Average Arm Model and Static Analysis Of The Modular Mumentioning

confidence: 99%

Full State Regulation of the Modular Multilevel DC Converter (M2DC) Achieving Minimization of Circulating Currents

Gruson

Moigne

et al. 2020

IEEE Trans. Power Delivery

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The M2DC exploits the interleaving between the three legs of an MMC to realize a promising uninsulated DC/DC converter to interconnect HVDC grids. This paper details a current and energies decoupled model of the M2DC. The major idea proposed in this paper is focused on the full energy control generating optimal current references to minimize the internal currents magnitude. The energy sum and difference models are fully detailed. Both current and energy control loops are based on the model inversion principle in order to control all the state variables. The proposed control is based a dynamic control developed with the model inversion principle associated with an optimization of the current magnitude deduced from a quasi-static analysis. All dynamics of the system are then explicitly controlled, which guarantee a good dynamic behavior during the transient. Therefore, current and energy controls are presented in detail. Simulation results show the dynamic behavior of the converter for various operating points.

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Section: Average Arm Model and Static Analysis Of The Modular Mumentioning

confidence: 99%

Full State Regulation of the Modular Multilevel DC Converter (M2DC) Achieving Minimization of Circulating Currents

Gruson

Moigne

et al. 2020

IEEE Trans. Power Delivery

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“…Dynamic responses of the DC grid are improved in [11,12]. The MMC based HVDC-line protection methods for DC-grid are described in [13,14]. Ref.…”

Section: Literature Reviewmentioning

confidence: 99%

Design and Line Fault Protection Scheme of a DC Microgrid Based on Battery Energy Storage System

et al. 2018

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Currently, the Direct-Current (DC) microgrid has been gaining popularity because most electronics devices require a DC power input. A DC microgrid can significantly reduce the AC to DC energy conversion loss. However, a power grid may experience a line fault situation that may damage important household devices and cause a blackout in the power system. This work proposes a new line fault protection scheme for a DC microgrid system by using a battery energy storage system (BESS). Nowadays, the BESS is one of the most cost effective energy storage technologies for power system applications. The proposed system is designed from a distributed wind farm smart grid. A total of three off-shore wind farms provide power to the grid through a high voltage DC (HVDC) transmission line. The DC microgrid was modeled by a BESS with a bi-directional DC-DC converter, various DC-loads with step down DC-DC converters, a voltage source converter, and a voltage source inverter. Details of the control strategies of the DC microgrid are described. During the line fault situation, a transient voltage was controlled by a BESS. From the simulation analyses, it is confirmed that the proposed method can supply stable power to the DC grid, which can also ensure protection of several loads of the DC microgrid. The effectiveness of the proposed system is verified by in a MATLAB/SIMULINK ® environment.

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“…The front-to-front configuration of two MMCs (FtF-MMC) and its extensions [21], [22] are popular solutions. Not only do they inherit all the benefits of the conventional ac-dc MMC they can also block the propagation of dc fault current from either side to the other.…”

Section: Introductionmentioning

confidence: 99%

A Modular Multilevel DC–DC Converter With a Compact Sub-Module Stack Suited to Low Step Ratios

Xiang

Zhang

Chaffey

et al. 2019

IEEE Trans. Power Delivery

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The voltage ratings for dc transmission and distribution are not currently standardized because cable technology is advancing rapidly and therefore low step-ratio dc-dc converter at multi-megawatt scale is a crucial technology for combining point-to-point dc links into multi-terminal networks. This paper presents a modular multilevel dc-dc converter configuration with only a single stack of half-bridge sub-modules (SM) and a resonant tank. The power processed through the stack is a small fraction of the throughput power if the step-ratio is small (− ⁄). Detailed analysis shows the required semiconductor ratings are much smaller compared to the front-to-front MMC and modular converters derived from standard dc-dc topologies. Further, the requirement for SM capacitive energy storage is also significantly less than those converters. The theoretical analysis and the operating principles have been verified by full-scale simulation examples and experiments with a down-scaled prototype. The SMs are operated with an adjustable phase-shift to create a high frequency excitation across the resonant tank for further volume reduction. The SM capacitors self-balance without the need for switching pattern adjustments and the resonant operation provides soft-switching for all power switches to increase efficiency.

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Dual Channel Control With DC Fault Ride Through for MMC-Based, Isolated DC/DC Converter

Cited by 48 publications

References 15 publications

Full State Regulation of the Modular Multilevel DC Converter (M2DC) Achieving Minimization of Circulating Currents

Full State Regulation of the Modular Multilevel DC Converter (M2DC) Achieving Minimization of Circulating Currents

Design and Line Fault Protection Scheme of a DC Microgrid Based on Battery Energy Storage System

A Modular Multilevel DC–DC Converter With a Compact Sub-Module Stack Suited to Low Step Ratios

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