The destabilizing behavior of on-load tap-changers is an important mechanism responsible for the voltage collapse of power systems. The authors use a nonlinear dynamic model of the tap-changer, impedance loads, and decoupled reactive power-voltage relations to reconstruct the collapse. Based on the proposed M-bus network model, results presented include (1) a criterion for voltage stability, (2) a method to obtain a voltage region, and (3) qualitative characterizations of the equilibria.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Vu et al. (2003) studied this question.