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Lyapunov Exponent-Based Online Voltage Stability Assessment Using PMU Data


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DOI: https://doi.org/10.15866/iree.v12i5.13281

Abstract


In nowadays profit-making-power market, especially with deregulation, the existing power system network is operating at its maximum permissible limits. In such stressful conditions, even a small disturbance may lead to system collapse because of voltage or frequency stability issues. In addition, with the increase in nonlinear loads and reactive power demand, voltage stability (VS) has recently gained more attention. However, the traditional stability assessment tools may not be capable to forecast VS problems sufficiently in advance. In view of this, the present paper addresses a novel methodology based on Lyapunov Exponent (LE) to forecast the VS of the system using the time stamped series voltage data received from the Phasor Measurement Unit (PMU). Because of the geographical wide spread nature of network and the unpredictable disturbances at any location, the stability assessment in post-disturbed condition is computationally challenging, especially in case of online control. In contrast with the traditional VS methods, the proposed method tracks only the LE to predict voltage stability and hence finds efficient alternatives to the online surveillance of the voltage stability of wide area network (WAN) having PMU data. This paper develops the LE theory for calculating the Voltage Stability Index (VSI) and its effectiveness is verified by applying it to New England 39 Bus system.
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Keywords


Data Window; Lyapunov Exponent; Time Series Data; Voltage Stability

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References


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