On plant modeling for the PIM digital redesign of a power system stabilizer

  • Authors:

  • G. Shabib

  • Affiliations:

  • Department of Electrical Engineering, South Valley University, Aswan Higher Institute of Energy, Aswan, Egypt

  • Venue:
  • WSEAS Transactions on Systems and Control
  • Year:
  • 2011

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Abstract

This paper is concerned with the plant modeling for the digital redesign of a continuous-time power system stabilizer PSS for the single machine power system using the so-called Plant-Input-Mapping PIM method. The traditional approach has been to use the bilinear transform (Tustin's method), but this gives numerical difficulties with large sampling intervals which are now becoming usual with modern control hardware. The proposed technique guarantees the stability for any sampling rate and takes the closed-loop characteristics into account. The proposed technique is successfully applied to the discretization of a continuous time PSS for single-machine power system. For comparison studies the proposed technique is compared with continuous-time PSS and Tustin's PSS. The simulation results show that the proposed digital redesign technique reflects the frequency and dynamic responses of the system more accurately as the continuous-time PSS. Also, they show that Tustin's method falls when sampling interval becomes larger while the proposed PIM method guarantees stability even with relatively slow sampling rates.