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Certain approaches to appraising voltage stability use an equivalent impedance to characterize the wider power system. This letter proposes two new ways of inferring an appropriate equivalent impedance from a power system's admittance matrix. Continuation power flow simulations are used to validate the quality of the new estimators, and to benchmark them against some extant approaches.
Monitoring the long term voltage stability of the power grid is necessary to ensure its secure operation. In this paper, a voltage stability index that is linear with the power demand, called the M-index, based only on angles is proposed. The linearity of the M-index can be utilized to estimate the load margin directly. The linearity of the M-index is proved for the two-bus system and a method to...
This paper proposes a new approach using phasor measurement units (PMUs) to estimate real-time voltage stability margin for a load area supported by multiple tie lines. For the monitored tie lines, it can provide accurate real and reactive power transfer margins. Compared to a traditional Thevenin equivalent-based approach, the new approach is more tolerant of fluctuations in the phase angles of the...
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