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A communication-free reactive-power control strategy in VSC-HVDC multi-terminal systems to improve transient stability

J. Renedo, L. Rouco, A. García-Cerrada, L. Sigrist

This paper proposes a new reactive-power control strategy for High Voltage Direct Current multi-terminal systems with Voltage Source Converter stations (VSC-HVDC) to improve transient stability in electric power transmission systems. The proposed algorithm uses local measurements to estimate, in each converter station, a weighted average of the frequencies seen by the VSC stations of the HVDC multi-terminal system. This estimation is carried out making use of a (small) auxiliary local active-power modulation along with the DC-side voltage droop control in the VSC stations, where the latter also uses local measurements only. The estimated frequency is used as the set point for supplementary reactive-power control at each converter station. The proposed control law has been simulated in a test system using PSS/E and the results show that it improves transient stability, significantly, producing similar results to those obtained controlling reactive power using global measurements.


Keywords: VSC HVDC; Multi-terminal; Transient stability; Reactive power control; Power systems; Local measurements


Electric Power Systems Research. Volume: 174 Issue: 105854 Pages: 1-13

JCR Impact Factor and Scopus quartile: 2.856 - Q1 (2017)

DOI reference: DOI icon 10.1016/j.epsr.2019.04.032    

Published on paper: September 2019. Published on-line: May 2019.



Citation:
J. Renedo, L. Rouco, A. García-Cerrada, L. Sigrist. A communication-free reactive-power control strategy in VSC-HVDC multi-terminal systems to improve transient stability. Electric Power Systems Research. vol. 174, no. 105854, pp. 1-13, September 2019. [Online: May 2019]


    Topics research:
  • HVDC/FACTS
  • Stability: large disturbance stability, tuning of frequency loadshedding schemes, excitation control, small disturbance stability, tuning of power system stabilizers, identification of AVR and governor models

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