Windspeed-dependent underdamping and its cure in the self-excited series-wound aerogenerator

Annraoi M. de Paor and Brian Cogan

Applied Energy, 1992, vol. 42, issue 4, 253-267

Abstract: A simple scheme for generation of heat from windpower is explored, based on a fixed-pitch turbine driving a series-wound self-excited generator, feeding a fixed, linear resistive load. A serious disadvantage is that almost immediately after stable self-excitation the damping ratio associated with perturbations from the equilibrium state falls off drastically with windspeed, so that the resulting cyclic variations in current and angular velocity would certainly be destructive. A non-linear resistive load is then synthesised, based on maximizing the equilibrium power extraction at any windspeed, and its effect on the dynamics is analysed. It is found that stable excitation now occurs at the minimum possible windspeed, and that the equilibrium state never changes its nature: it remains a well-damped stable node. Practical implementation of the non-linear load by modern power-electronics is suggested as a worthwhile task.

Date: 1992
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