A DESENSITIZED CONTROLLER FOR VOLTAGE REGULATION OF POWER-SYSTEMS

In this paper a robust linear voltage controller is proposed to improv e power system stability and performance under varying operating condi tions. This controller includes the automatic voltage regulator and th e power system stabilizer. It limits the variations of the terminal vo ltage, damps the electromechanical oscillation and increases the excit ation during and after a short circuit in all operating points. The de sign method chosen to improve the parametric robustness is desensitivi ty. It is the first time that a parametric robust design method has be en applied to resolve the problem of voltage regulation. The method pr inciples when the parameter is a vector, are presented. The desensitiz ed controller has a simple structure and therefore call easily be impl emented. The results obtained with a simulation software and with the Electricite de France Transient Network Analyser show the good perform ance and the advantages of the controller with respect to various dist urbances. This method call be applied to all kinds of generators, and is particularly well suited in the case of turbogenerators working in very different operating conditions.