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Improved Control Technique for Enhancing Power System Stability in Out-of-Step Conditions

Author

Listed:
  • Nande Fose

    (Department of Electrical, Electronics and Computer Engineering, Cape Peninsula University of Technology, P.O. BOX 1906, Bellville 7535, South Africa)

  • Senthil Krishnamurthy

    (Department of Electrical, Electronics and Computer Engineering, Cape Peninsula University of Technology, P.O. BOX 1906, Bellville 7535, South Africa)

  • Prathaban Moodley

    (South African National Energy Development Institute (SANEDI), Upper Grayston Office Park, Sandton 2146, South Africa)

Abstract

From time to time, a series of unpredictable and conflicting contingencies can lead to angular instability of the power system and even blackouts if not adequately handled by an out-of-step (OOS) protection system. The key contribution of this research work, to the theory of out-of-step protection, is the identification and isolation after a given disruption of many unstable swings. This paper presents a proposed method to avoid false operation for distance function by out-of-step blocking to improve the system stability by using optimally placed PMUs for the fast detection of system analogue quantities. The studies were performed on a modified Eskom transmission network in the Western Cape with 765 kV and 400 kV voltage levels. The aim is to investigate the IEC 61850-90-5 standard for predictive dynamic stability maintaining systems using PMUs for out-of-step conditions of synchronous generators. The power system modelling and simulation are performed in the RSCAD-FX for the proposed multi-area power system network. An experimental lab-scale implementation is built to test the proposed out-of-step algorithm in a real-time digital simulator. Software-based PMU is incorporated to test and validate the IEC 61850-90-5 standard sampled values. Simulation and experimental results are presented.

Suggested Citation

  • Nande Fose & Senthil Krishnamurthy & Prathaban Moodley, 2024. "Improved Control Technique for Enhancing Power System Stability in Out-of-Step Conditions," Energies, MDPI, vol. 17(16), pages 1-23, August.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:16:p:4086-:d:1458096
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