Experimental Validation of an Active Wideband SSR Damping Scheme for Series-Compensated Networks

T. Joseph, C. E. Ugalde Loo, S. Balasubramaniam, J. Liang, G. Li

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Transmission network reinforcements are being undertaken to meet renewable energy targets toward a low carbon transition. High-voltage direct-current (HVDC) links and series-compensated ac lines are frontrunners in these developments. Although series capacitor installations can lead to subsynchronous resonance (SSR), HVDC links based on voltage source converters (VSCs) can be used to effectively damp SSR upon occurrence. An active damping technique to mitigate torsional interactions (TIs), a form of SSR, is presented. The damping scheme considers an active wideband filter to ensure positive damping in a wide range of subsynchronous frequencies. A state-space representation of the system has been formulated and eigenanalyses have been performed to assess the impact of the HVDC link on the TIs. A damping torque study for SSR screening is carried out, with results complemented with time-domain simulations to assess the accuracy of the small-signal models. The test system is implemented in a real-Time digital simulator and connected to a VSC-HVDC scaled-down test rig to validate the damping scheme through hardware-in-The-loop experiments. The presented damping method exhibits a satisfactory performance, with time-domain simulations and laboratory experiments showing a good correlation.

Original languageEnglish
Article number8744591
Pages (from-to)58-70
Number of pages13
JournalIEEE Transactions on Power Delivery
Issue number1
Early online date24 Jun 2019
Publication statusPublished - Feb 2020
Externally publishedYes

Bibliographical note

Funding Information:
Manuscript received October 7, 2018; revised February 2, 2019 and April 23, 2019; accepted June 2, 2019. Date of publication June 24, 2019; date of current version January 22, 2020. This work was supported in part by the People Programme (Marie Curie Actions) of the EU FP7 Programme (FP7/2007-2013) through the project “Multi-terminal DC grid for offshore wind” (MEDOW), under Grant 317221, and in part by the EU FP7 Programme through the project “Beyond State of the art Technologies for re-Powering AC corridors & multiTerminal HVdc Systems” (BEST PATHS), under Grant 612748. Paper no. TPWRD-01183-2018. (Corresponding author: Carlos E. Ugalde-Loo.) T. Joseph, C. E. Ugalde-Loo, J. Liang, and G. Li are with the School of Engineering, Cardiff University, Cardif CF24 3AA, U.K. (e-mail: JosephT@cardiff.ac.uk; Ugalde-LooC@cardiff.ac.uk; LiangJ1@cardiff.ac.uk; LiG9@cardiff.ac.uk).

Publisher Copyright:
© 1986-2012 IEEE.


  • HVDC
  • Subsynchronous resonance
  • VSC
  • active filter
  • damping torque
  • eigenanalysis
  • series compensation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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