Self-tuning nodal voltage regulation in power systems based on optimal pole-shifting technique

The design of a indirect self-tuning power system nodal voltage regulator using the pole-shifting technique is presented. A recursive least-squares (RLS) algorithm with variable forgetting factor and dead-zone estimates at each sampling step the parameters of an approximated discrete-time linear model describing the system dynamics from the regulation node. Based on the estimated parameters, the regulator polynomials are obtained as the solution of the Diophantine equation which imposes, according to the pole-shifting approach, closed-loop pole locations ensuring the minimization of the normalized quadratic control input. The presence of limits imposed on the control input is also taken into account. Simulations results are finally report to verify the regulator performance