Science China Technological Sciences

, Volume 61, Issue 8, pp 1207–1216 | Cite as

Evaluation of commutation failure risk in single- or multi-infeed LCC-HVDC systems based on equivalent-fault method

  • Kuan Zheng
  • Chen Shen
  • Feng Liu


In single- or multi-infeed line-commutated converter-based high-voltage direct current (LCC-HVDC) systems, commutation failure (CF) induced by alternating current (AC) faults may lead to serious consequences. Considering the randomness of fault occurrences, an accurate evaluation of the CF risk (CFR) from the system point of view becomes necessary in power system planning and operation. This paper first provides a definition of the CF severity (CFS) index corresponding to an AC fault. Then, on the basis of electromagnetic transient (EMT) simulation, an approach to calculate the CFS index considering the randomness of fault-occurrence time is presented. A novel equivalent-fault method is further put forward to make the EMT simulation scalable to calculate the CFS index in terms of a fault occurring in a large-scale receiving-end grid. Thereafter, the CFR index is introduced, which is defined as the sum of the products of the CFS index of each AC fault and the corresponding fault rate. Finally, the proposed method is verified on the modified IEEE 9-bus and modified IEEE 39-bus systems using PSCAD/EMTDC.


commutation failure severity equivalent-fault method commutation failure risk fault randomness electromagnetic transient simulations 


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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Power Systems, Department of Electrical EngineeringTsinghua UniversityBeijingChina

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