A novel fault current limiter for accelerating fault current suppression in MMC-HVDC systems

Fu, Zhouxing; Yang, Mengmeng; Sima, W.; Sun, Pengju; Tang, Yuhai; Wang, X.; Long, Yang

doi:10.1049/icp.2020.0320

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally, some value of DC reactors employed in practical projects can be up to 150 mH, e.g., the Zhangbei DC grid in China plans to install 100∼200 mH DC reactors for a healthy network to obtain fault ride-through capability. However, such a large DC reactor prolongs the fault current suppression time (duration of fault current falling stage) for the DCCBs due to the freewheeling effect of the large inductance of a DC reactor [29,30]. To lessen the freewheeling effect of a large DC reactor, [31] proposes a current-limiting circuit utilizing a DC reactor and an energy dissipation circuit, and [32] proposes a novel current-commutation-based FCL, but their power electronic switches have to withstand high voltage stresses, leading to a large number of power electronic switches and high cost.…”

Section: Introductionmentioning

confidence: 99%

An adaptive‐impedance fault current limiter for accelerating fault current suppression in MMC‐HVDC systems

Duan

Yang

et al. 2022

IET Generation Trans & Dist

View full text Add to dashboard Cite

DC fault clearance is one of the critical issues for the modular-multilevel-converter-based high voltage direct current (MMC-HVDC) systems. Employing a hybrid DC circuit breaker (H-DCCB) to isolate the faulty line is a typical method to achieve fast fault clearance. However, the H-DCCB has to interrupt the fault current and absorb the energy up to tens of megawatts in several milliseconds. Through theoretical analysis of the interruption process using the H-DCCB, reducing the equivalent inductance of the fault circuit during the fault falling stage is recommended to accelerate the fault current suppression for the H-DCCBs. This paper proposes a novel adaptive-impedance fault current limiter (AFCL), which contains two coupled DC reactors and an energy absorption branch (EAB). The proposed AFCL can automatically limit the fault current during the current rising stage and works as a DC reactor with a fixed equivalent inductance through a two-state model analysis. Meanwhile, the AFCL contributes to accelerating the decline of the current by adaptively reducing the inductance of the discharge circuit. Consequently, the fault current suppression time and the energy absorbed by the H-DCCB are reduced. Simulation case studies and hardware experiments are carried out to verify the performance and practicality of the proposed AFCL.

show abstract