On DC Fault Dynamics of MMC-Based HVdc Connections

Kontos, E.; Tsolaridis, Georgios; Teodorescu, Remus; Bauer, Pavol

doi:10.1109/tpwrd.2017.2764162

Cited by 34 publications

(21 citation statements)

References 21 publications

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“…On the other hand, many authors are recently addressing the fault analysis hot topic applied to dc network cables and their dynamic effect [75]. As cited in [76], conventional converters (voltage source converters and MMCCs) are not able to isolate dc faults by themselves.…”

Section: Discussion On Fault Tolerancementioning

confidence: 99%

A Comparison of Power Conversion Systems for Modular Battery-Based Energy Storage Systems

et al. 2020

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A modular battery-based energy storage system is composed by several battery packs distributed among different modules or parts of a power conversion system (PCS). The design of such PCS can be diverse attending to different criteria such as reliability, efficiency, fault tolerance, compactness and flexibility. The present paper proposes a quantitative and qualitative comparison among the most widely proposed PCSs for modular battery-based energy storage systems in literature. The obtained results confirm the high performance of those PCSs based on the parallel connection of different modules to a single point of common coupling, also identifying those based on modular multilevel cascaded converters as promising concepts according to the assumptions of the present paper. INDEX TERMS Hybrid energy storage systems, batteries, power electronics.

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Section: Discussion On Fault Tolerancementioning

confidence: 99%

A Comparison of Power Conversion Systems for Modular Battery-Based Energy Storage Systems

et al. 2020

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“…In practical application, the MMC would be blocked after the detection of dc side fault. Therefore, analysis of the transient response of dc side fault is based on the blocking of MMC [21,[41][42][43][44][45]. In [15], before the MMC is blocked, the ac current contributes to the dc side.…”

Section: Ptp Faultmentioning

confidence: 99%

“…The time-domain formulation of dc fault current can be deduced based on the differential equation [21,41,46] i…”

Section: Arm Capacitor Discharging Stage (Before Blocking)mentioning

confidence: 99%

Review on topology‐based dc short‐circuit fault ride‐through strategies for MMC‐based HVDC system

Wan

Mao

Zhou

et al. 2020

IET Power Electronics

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Modular multilevel converter (MMC) based high-voltage direct-current (HVDC) transmission system is a promising solution to the bulk power transmission over a long distance, especially for renewable energy integration. However, conventional half-bridge submodules MMC topology is susceptible to dc faults. In this study, dc short-circuit fault analysis and a review on recent advances in clearing dc fault current utilising different topologies are presented. Furthermore, the MMC can also work as a static synchronous compensator, producing reactive power to support the grid and improving the stability of the system when dc fault occurs. Finally, the comparison for different topologies in terms of device cost, estimated power losses, dc fault ridethrough capability, and reactive power compensation capability is given.

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“…The first one is to trip the AC circuit breaker. However, the operation of AC circuit breaker is slow, which would affect the transient stability of the connected AC systems [8]. The second one is to use MMCs with DC fault clearing capability, such as full-bridge SM (FBSM) MMC or clamp double SM (CDSM) MMC [9][10].…”

Section: Introductionmentioning

confidence: 99%

An Equivalent Calculation Method for Pole-to-Ground Fault Transient Characteristics of Symmetrical Monopolar MMC Based DC Grid

Zhang

et al. 2020

IEEE Access

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The pole-to-ground fault is one of the most typical faults in modular multilevel converters (MMCs) based DC grid. Analyzing the transient characteristics of fault voltages and currents is of great significance for fault identification, configuration of protection, and optimization of system parameters. This paper proposes an equivalent transient characteristics calculation method for pole-to-ground faults for symmetrical monopolar MMC based DC grid. Firstly, according to the mechanism of the pole-to-ground faults, the fault network and the steady-state network are formed. Then, the star-delta transformation is performed on modelling the MMCs in the fault network, which overcomes the problem that the number of the inserted sub-modules (SMs) in each arm is time-variant. Based on the discrete adjoint model, the prefault and faulted matrices describing the voltages and currents are established, and a general method for solving the transient voltages and currents is proposed. Finally, the proposed method is validated in a fourterminal symmetrical monopolar MMC based DC grid. The results show that the proposed method is of high accuracy, and is much more time efficient than time-domain simulation. INDEX TERMS Modular multilevel converter (MMC), symmetrical monopolar, DC grid, pole-to-ground fault, discrete adjoint model, voltage and current characteristics

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On DC Fault Dynamics of MMC-Based HVdc Connections

Cited by 34 publications

References 21 publications

A Comparison of Power Conversion Systems for Modular Battery-Based Energy Storage Systems

A Comparison of Power Conversion Systems for Modular Battery-Based Energy Storage Systems

Review on topology‐based dc short‐circuit fault ride‐through strategies for MMC‐based HVDC system

An Equivalent Calculation Method for Pole-to-Ground Fault Transient Characteristics of Symmetrical Monopolar MMC Based DC Grid

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