A Method to Calculate Short-Circuit Faults in High-Voltage DC Grids

Guo, Yanxun; Li, Haifeng; Liang, Yuansheng; Wang, Gang

doi:10.1109/tpwrd.2020.2978625

Cited by 13 publications

(15 citation statements)

References 23 publications

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“…Various types of DC short circuit faults may occur in an MMC-based MTDC power grid, such as pole-to-pole short circuit fault and single-pole-to ground short-circuit fault. Existing research on DC short circuit current calculation mainly focuses on the pole-to-pole short circuit fault, because the pole-to-pole fault current of which is the most serious fault currents of all types of DC fault [13,[34][35][36][40][41][42]. Therefore, the calculation of pole-to-pole short circuit current can provide guidance for parameter design and protection schemes of DC power grids.…”

Section: Short Circuit Current Calculation Methodsmentioning

confidence: 99%

“…The calculation of DC short circuit current calculation considering MMC control in [42] is performed in the frequency domain. The MMC is represented by an AVM and the effect of fault-generated traveling waves (FTWs) is fully considered.…”

Section: Short-circuit Current Calculation Considering MMC Controlmentioning

confidence: 99%

“…When compared with the equivalent circuit method in [13,34] ignoring the MMC control, the short calculation proposed in [40][41][42] consider the dynamics of the control system in the short circuit current calculation, which can provide guidance for fault current suppression through MMC control.…”

Section: Short-circuit Current Calculation Considering MMC Controlmentioning

confidence: 99%

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Review on Short-circuit Current Analysis and Suppression Techniques for MMC-HVDC Transmission Systems

et al. 2020

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The modular multilevel converter (MMC) has been widely adopted in high voltage direct current (HVDC) transmission systems due to its significant advantages. MMC-HVDC is developing towards multi-terminal direct current (MTDC) power grid for reliability enhancement. However, there exist a huge amplitude and a steep rise in fault current due to the low impedances of DC lines and MMCs, which threaten the security and reliability of the DC power grids. It is necessary to restrain the DC short circuit current in order to ensure the safe and stable operation of DC power grids. This paper gives a comprehensive review and evaluation of the proposed DC short-circuit current analysis and suppression techniques used in MMC-based MTDC power girds, in terms of MMC modeling, short circuit calculation, and suppression method. In addition, future trends of countermeasures to short circuit current in MMC-based MTDC power grids are also discussed.

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Section: Short Circuit Current Calculation Methodsmentioning

confidence: 99%

Section: Short-circuit Current Calculation Considering MMC Controlmentioning

confidence: 99%

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Review on Short-circuit Current Analysis and Suppression Techniques for MMC-HVDC Transmission Systems

et al. 2020

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“…On the other hand, ignoring the AC infeed may result in significant deviation between the estimated and the actual results of the fault current. It is found in [17,18] that the computational node voltages without considering the AC infeed significantly deviate from actual values. After a remote DC fault occurs, the simplified model that ignores the AC infeed may cause a capacitor voltage rise of the MMC, which is in contrary to a practical situation.…”

Section: Introductionmentioning

confidence: 99%

“…[17] proposes a general companion circuitbased method to estimate the currents of asymmetric bipolar multi-terminal HVDC grids. The fault calculations based on variable and constant MMC current sources are presented in [18]. The aforementioned papers have contributed to improving the computational accuracy of the fault current.…”

Section: Introductionmentioning

confidence: 99%