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Load modelling in studies of power system damping

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2 Author(s)
Hiskens, I.A. ; Dept. of Electr. & Comput. Eng., Newcastle Univ., NSW, Australia ; Milanovic, J.V.

This paper considers the significance of load voltage dynamics in studies of power system damping. A generic model of dynamic loads is used to investigate the influence of active and reactive power dynamics on the damping of oscillations in a multimachine power system. The interaction between the load and the power system is explored in terms of load and system transfer functions. It is shown that the power system transfer function is composed of a static part and a dynamic part. The static part is derived from the power flow Jacobian. The investigations indicate that load voltage dynamics can significantly influence the damping of modal oscillations. Static load models can give quite misleading predictions of damping when loads actually exhibit dynamic behaviour.

Published in:

Power Systems, IEEE Transactions on  (Volume:10 ,  Issue: 4 )