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Lyapunov stability-based wide area control systems for excitation boosters in synchronous generators

L. Díez Maroto, J. Renedo, L. Rouco, F. Fernández-Bernal

Excitation Boosters (EB) are aimed to improve Fault Ride Through (FRT) capability of synchronous generators equipped with bus fed static excitation systems by means of adding a supplementary voltage or current source to the rectifier. However, this paper shows that EBs governed by local On-Off controls may result in adverse effects in case of remote faults from generators that may occur in multi-machine systems. To sort this problem out, a novel EB Wide Area Control System (WACS) that modulates the EB voltage using the generator speed deviation with respect to the speed of the Center Of Inertia (COI) is proposed. The speed of the COI is obtained using a Wide Area Measuring System (WAMS), whereas the control laws are deduced from the Lyapunov stability theory. Results show that transient stability of multi-machine systems can be enhanced using EB WACS.

Keywords: Excitation Booster, Bus Fed Static Excitation System, Fault Ride Through Capability, Grid Codes, Transient Stability, Ultracapacitor, WAMS.

IEEE Transactions on Power Systems. Volume: 34 Issue: 1 Pages: 194-204

Journal Impact Factor: JCR impact factor 5.255 (2017)

DOI reference: DOI icon 10.1109/TPWRS.2018.2865970    

Published on paper: January 2019. Published on-line: August 2018.

    Topics research:
  • 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
  • Power electronics

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