Abstract
ABSTRACT Continuous assessment of voltage stability is vital to ensure the secure operation of the power system. Based on this concern, a number of online voltage stability analysis methods have been proposed. Among these indices, the impedance match concept based on Thévenin equivalent has attracted a lot of interest. However, the traditional impedance match is reported not to perform as expected under multi-load power systems. This paper proposes a new approach for voltage stability assessment based on the Banach fixed-point theorem. This leads to a real-time voltage stability monitoring scheme without the need to estimate Thévenin parameters. The derived method was tested on a 5-generators and 18-bus system by time-domain dynamic simulations and simulated on an actual power system using real phasor measurement unit.
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