Wide-range power system pole placer

Previous analysis of synchronous machines under small perturbations has been extended. First, the change of the parameters K₁-K₄ describing the system has been expressed in explicit analytical form for different loading. From this a set of curves has been plotted to show variations of such parameters by changing the operating condition, which is an important factor in dynamic stability studies. Secondly, a full-rank pole placer is designed to be robust in the sense that the desired poles do not change much with `large´ variations in parameters K₁-K₄. The solution is based on a nonlinear programming approach. Comparison with a unity-rank controller shows the superiority of the proposed device