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arXiv · 2203.01362

Simplified Stability Assessment of Power Systems with Variable-Delay Wide-Area Damping Control

K. K. Gajjar·Kaustav Dey·A. M. Kulkarni
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Abstract

Power electronic devices such as HVDC and FACTS can be used to improve the damping of poorly damped inter-area modes in large power systems. This involves the use of wide-area feedback signals, which are transmitted via communication networks. The performance of the closed-loop system is strongly influenced by the delay associated with wide-area signals. The random nature of this delay introduces a switched linear system model. The stability assessment of such a system requires linear matrix inequality based approaches. This makes the stability analysis more complicated as the system size increases. To address this challenge, this paper proposes a delay-processing strategy that simplifies the modelling and analysis in discrete-domain. In contrast to the existing stability assessment techniques, the proposed approach is advantageous because the stability, as well as damping performance, can be accurately predicted by a simplified analysis. The proposed methodology is verified with a case study on the 2-area 4-machine power system with a series compensated tie-line. The results are found to be in accordance with the predictions of the proposed simplified analysis.

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K. K. Gajjar, Kaustav Dey, A. M. Kulkarni. 2022-03-02. Simplified Stability Assessment of Power Systems with Variable-Delay Wide-Area Damping Control. https://doi.org/10.1109/pesgm48719.2022.9917063

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