Cascaded commutation circuit for a hybrid DC breaker with dynamic control on fault current and DC breaker voltage

Shan, Yunhai; Lim, T.C.; Finney, S.J.; Guang, Weixiao; Williams, B.W.; Holliday, Derrick; Ding, Xiao

doi:10.1049/iet-pel.2016.0472

Cited by 4 publications

(3 citation statements)

References 27 publications

(41 reference statements)

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“…where Dt r is the time needed to determine whether the fault is cleared during the reclosing process As shown in (10), the energy dissipated through R s during the O-C-O process is determined by the resistance and DC system voltage. Therefore, the design limit for N max is limited by the resistance and energy-dissipating ability of the chosen resistor.…”

Section: B Reclosing Processmentioning

confidence: 99%

Reclosing Current Limiting for DC Line Faults in VSC-HVDC Systems

Wang

Zhou

Shu

et al. 2022

Journal of Modern Power Systems and Clean Energy

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The problem of reclosing current limiting in voltage source converter based high-voltage direct current (VSC-HVDC) systems is becoming more and more serious. A soft reclosing scheme for DC permanent faults is presented in this paper. Because the converter voltages of stations at both terminals of the disconnected faulty line may be different, the choice of which terminal to reclose first will affect the reclosing overcurrent. A method for selecting the terminal to reclose first is investigated to achieve a minimum peak overcurrent during the reclosing process. In order to ensure that the hybrid DC circuit breaker (HDCCB) adapts to the needs of the reclosing process better, the traditional HDCCB is improved by adding a soft reclosing module (SRM). The energy dissipated in the arresters is significantly reduced when using the improved HDCCB. The improved HDCCB will be able to reclose multiple times safely and thus increase the possibility of successful reclosing. Moreover, the recovery time after the HDCCB is successfully reclosed is very short with the improved HDCCB and its control principles. Simulation results show that this proposed scheme is capable of limiting the reclosing overcurrent when the fault still exists.

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Section: B Reclosing Processmentioning

confidence: 99%

Reclosing Current Limiting for DC Line Faults in VSC-HVDC Systems

Wang

Zhou

Shu

et al. 2022

Journal of Modern Power Systems and Clean Energy

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“…In particular, the current commutates from the MS to the commutation branch due to a different DC breaking topology [12]. With the omission of the snubber circuit, decrease in the current change rate, and increase in transient recovery voltage rate before zerocurrent, a cascaded commutation circuit and a parallel LC branch series with a thyristor were used to improve the fault current interruption capacity in [13] and [14]. Moreover, the circuit breaker (CB) characterized by the commutation of a short-circuit current from the load-carrying branch to the auxiliary branch based on rapid and precise current control by the multilevel pulse-width modulation (PWM) converter allows for the elimination of active semiconductor devices from the load current branch [15].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Experimental Research on a Novel Multi-Contact MVDC Natural Current Commutation Breaking Topology

Jia

Xia

et al. 2020

IEEE Access

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The high performance of medium-voltage direct current (MVDC) power supply system is a prerequisite for several industrial applications. To meet the higher voltage direct current (DC) breaking requirements in the fields of aviation, aerospace, and new energy, this paper proposes a novel MVDC commutation breaking topology that combines a load-carrying branch and an arcing branch in parallel. In contrast to the conventional structure based on semiconductor devices, each branch in the proposed topology contains a mechanical contact, which provides a lower on-state loss and higher voltage-breaking capacity. Moreover, the theoretical analysis and experimental results verified the asynchronous operation of the current-loading and confirmed that the arcing branch can realize the natural commutation of the current for the breaking of overload current or short-circuit current. A detailed equivalent model that combines the micro-electrical contact theory and phase-change characteristics of the electrode material was then established to investigate the molten metal bridge and pseudo arc phenomenon of the contact area during the commutation process. The results indicated that although the presence of a molten metal bridge and pseudo arc increase the current commutation time and erosion of the electrode material, the commutation process can be conducted. Finally, based on the softening voltage of the electrode material under the rated conditions, in addition to the phase change during dynamic commutation, the roughness σ and elastic modulus E can be adjusted appropriately to achieve arc-less current commutation.

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“…They can be broadly divided into two technical routes. One is based on converters incapable of fault current interruption and DC breakers (DCBs) [12][13][14][15]. Fault isolation and system recovery are mainly realized by the fast operation of the corresponding DCBs.…”

Section: Introductionmentioning

confidence: 99%

Sequential auto-reclosing strategy for hybrid HVDC breakers in VSC-based DC grids

Pei

Tang

Zhang

2018

J. Mod. Power Syst. Clean Energy

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The use of overhead lines for power transmission in the future high-voltage and large-capacity voltagesource converter (VSC)-based direct current (DC) grid will significantly increase the probability of temporary faults. To eliminate potential adverse impacts such as erroneous protection, line-insulation failure, and even damage to power electronic devices resulting from a DC breaker reclosing operation with the traditional sequential autoreclosing strategy, a novel sequential auto-reclosing strategy for hybrid HVDC breakers (HHBs) in VSC-based DC grids is proposed. This strategy is based on the step-by-step operation of the transfer branch in the HHB. As a result, du/dt resulting from the HHB reclosing operation is greatly reduced, and therefore those potential negative impacts can be eliminated. Several other advantages are also presented. The feasibility and validity of the proposed strategy are verified in a four-terminal annular VSC-based DC grid electromagnetic transient model.

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Cascaded commutation circuit for a hybrid DC breaker with dynamic control on fault current and DC breaker voltage

Cited by 4 publications

References 27 publications

Reclosing Current Limiting for DC Line Faults in VSC-HVDC Systems

Reclosing Current Limiting for DC Line Faults in VSC-HVDC Systems

Analysis and Experimental Research on a Novel Multi-Contact MVDC Natural Current Commutation Breaking Topology

Sequential auto-reclosing strategy for hybrid HVDC breakers in VSC-based DC grids

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