Mode-switching control method of TCSC considering dual impedance phenomenon

Ke Jun Li, Jian Guo Zhao, Hong Xia Gao, Xue Shan Han, Lin Niu, K. M. Tsang, Wai Lok Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)


The mode-switching control method of thyristor controlled series capacitor (TCSC) is of great importance to power system stability. The switching control method becomes more complex because of the dual impedance phenomenon of TCSC. There is no way to realize mode-switching only by changing firing angles. Considering the influence of dual impedance phenomenon, a set of mode-switching control methods is proposed. By means of forced synchronization of current in thyristor branch with the line current, the mode switching from capacitive mode to Bypass can be implemented. In the switching strategy from capacitive mode to inductive veriner mode, a method of thyristor conditional firing is put forward. The thyristors will be fired and conducted on condition that both line current and capacitor voltage are inphase. To provide synchronization signal of line current for switching control in time, a method to forecast the zero-crossing point of the current is given. Simulation and experimental results show that the proposed switching methods can make the switching process fast and possess good dynamic performance.
Original languageEnglish
Pages (from-to)138-145
Number of pages8
JournalZhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering
Issue number25
Publication statusPublished - 5 Sept 2008


  • Conditional firing
  • Dual impedance phenomenon
  • Mode-switching
  • Power system
  • Thyristor controlled series capacitor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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