Analysis on the Operating Characteristic of UHVDC New Hierarchical Connection Mode to AC System

  • Huang Xiaojuan
  • Sun Jun
  • Fu Rong
  • Sun Wanqian

Abstract

The UHVDC system plays an important role in smart grids. In this paper, a new topology structure of UHVDC hierarchicalconnection mode to different AC systems is analyzed with a view to improving system transmission abilities. Then a newmathematical model is proposed to calculate the MIIF under different UHVDC hierarchical connection modes. The effectof coupling impedance, equivalent impedance and different DC control mode adopted by two group inverters are illustratedto analyze the MIIF. The method to calculate the MISCR of the multi-infeed HVDC system is also applied to HISCR ofUHVDC hierarchical connection mode with the MIIF value. In UHVDC hierarchical connection mode, total power to differenthierarchical active current layer can be allocated reasonably to change parameter of the received power grid. Thus, thecommutation failure can be analyzed according the MIIF change values of UHVDC hierarchical connection mode to the ACsystem. Therefore, it may increase the risk of commutation failure in the other converter when one converter is in a state ofcommutation failure. The correctness of the proposed method is verified by PSCAD simulation. The simulation results areillustrated to verify the operating characteristics of the system.

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Published
2016-12-04
How to Cite
XIAOJUAN, Huang et al. Analysis on the Operating Characteristic of UHVDC New Hierarchical Connection Mode to AC System. Journal of Power Technologies, [S.l.], v. 96, n. 4, p. 229--237, dec. 2016. ISSN 2083-4195. Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/862>. Date accessed: 17 sep. 2021.
Section
Electrical Engineering

Keywords

UHVDC, Hierarchical Connection Mode, MIIF, HISCR, Commutation failure

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