Combined application of SEDC and GTSDC for SSR mitigation and its field tests

Xiaorong Xie, Liang Wang, Yingduo Han

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

The subsynchronous resonance (SSR) problem may become more serious with the continuous evolvement of a series-compensated power system. Consequently, the existing SSR mitigation scheme might no longer keep the system stable. This issue has been encountered by Shangdu Power Plant, where the deployed supplementary excitation damping controllers (SEDCs) that well stabilized the system before cannot maintain torsional stability after the recent change occurred in the power system. Therefore, a combined mitigation scheme of SEDC and generator terminal subsynchronous damping controller (GTSDC) is proposed in this paper to regain system stability. SEDC provides electrical damping by modulating the excitation voltage at the rotor side. Meanwhile, GTSDC can damp SSR via injecting super-synchronous and subsynchronous currents into the generator stator. Field tests have proven the effectiveness of this combined scheme in addressing the deteriorated SSR issue. Eigenvalue analysis indicates that the combined scheme can provide enough positive damping for the system under any operating condition. Thanks to the low investment of SEDC and the flexibility of GTSDC, this combined scheme provides an economical and scalable solution for SSR mitigation, especially when the target system changes constantly.

Original languageEnglish
Article number7031968
Pages (from-to)769-776
Number of pages8
JournalIEEE Transactions on Power Systems
Volume31
Issue number1
DOIs
Publication statusPublished - Jan 2016

Keywords

  • Field test
  • Fixed series capacitor (FSC)
  • Generator terminal subsynchronous damping controller (GTSDC)
  • Subsynchronous resonance (SSR)
  • Supplementary excitation damping controller (SEDC)

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Xie, X., Wang, L., & Han, Y. (2016). Combined application of SEDC and GTSDC for SSR mitigation and its field tests. IEEE Transactions on Power Systems, 31(1), 769-776. Article 7031968. https://doi.org/10.1109/TPWRS.2015.2393892