In this paper a robust linear voltage contruller is proposed to improve power system stability and performance under varying operating conditions. This controller includes the automatic voltage regulator and the power system stabilizer.It limits the Variations of the terminal voltage, damps the electromechanical oscillation and increases the excitation during and after a short circuit in all Cipcrating points. The design method chosen to improve thc parametric robustness is desensitivity. It is the first time that a parametric robust design method has been applied to resolve the problem of voltage regulation. The method principles when the parameter is a vector, are presented. The desensitized controller has a simple structure and therefore a n easily be implemented. The results obtained with a siniulation software and with the Electricit6 de France Transient Network Analyser show the good performance and the advantages of the controller with respect to various disturbances. This method can be applied to a11 kinds of generators, and is particularly well suited in the case of turbogenerators working in very different operating conditions.
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