Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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Design of Direct-Current Fuzzy Controller for Mitigating Commutation Failure in HVDC System

  • Gao, Benfeng (Department of Electronic Engineering, North China Electric Power University) ;
  • Yuan, Kewei (Department of Electrical Engineering, North China Electric Power University) ;
  • Dong, Peiyi (State Grid Baoding Electric Power Supply Company) ;
  • Luo, Chao (Electric Power Research Institute of China Southern Power Grid) ;
  • Zhao, Shuqiang (Department of Electronic Engineering, North China Electric Power University)
  • Received : 2017.08.01
  • Accepted : 2018.02.11
  • Published : 2018.07.01
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Abstract

Commutation failures can deteriorate the availability of high-voltage direct current (HVDC) links and may lead to outage of the HVDC system. Most commutation failures are caused by voltage reduction due to ac system faults on inverter side. The commutation failure process can be divided into two stages. The first stage, from the occurrence to the clearing of faults, is called 'Deterioration Stage'. The second stage, from the faults clearing to restoring the power system stability, is called 'Recovery Stage'. Based on the analysis of the commutation failure process, this paper proposes a direct-current fuzzy controller including prevention and recovery controller. The prevention controller reduces the direct current to prevent Commutation failures in the 'Deterioration Stage' according to the variation of ac voltage. The recovery controller magnifies the direct current to speed up the recovery of power system in the 'Recovery Stage', based on the recovery of direct voltage. The validity of this proposed fuzzy controller is further proved by simulation with CIGRE HVDC benchmark model in PSCAD/EMTDC. The results show the commutation failures can be mitigated by the proposed direct-current fuzzy controller.

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References

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