Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Resonance Investigation and Active Damping Method for VSC-HVDC Transmission Systems under Unbalanced Faults

  • Tang, Xin (School of Electrical and Information Engineering, Changsha University of Science and Technology) ;
  • Zhan, Ruoshui (School of Electrical and Information Engineering, Changsha University of Science and Technology) ;
  • Xi, Yanhui (School of Electrical and Information Engineering, Changsha University of Science and Technology) ;
  • Xu, Xianyong (School of Electrical and Information Engineering, Changsha University of Science and Technology)
  • Received : 2018.11.26
  • Accepted : 2019.06.21
  • Published : 2019.11.20
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Abstract

Grid unbalanced faults can cause core saturation of power transformer and produce lower-order harmonics. These issues increase the electrical stress of power electronic devices and can cause a tripping of an entire HVDC system. In this paper, based on the positive-sequence and negative-sequence impedance model of a VSC-HVDC system as seen from the point of common connection (PCC), the resonance problem is analyzed and the factors determining the resonant frequency are obtained. Furthermore, to suppress over-voltage and over-current during resonance, a novel method using a virtual harmonic resistor is proposed. The virtual harmonic resistor emulates the role of a resistor connected in series with the commutating inductor without influencing the active and reactive power control. Simulation results in PSCAD/EMTDC show that the proposed control strategy can suppress resonant over-voltage and over-current. In addition, it can be seen that the proposed strategy improves the safety of the VSC-HVDC system under unbalanced faults.

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References

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