Abstract
This paper presents some considerations regarding the influence of parameters
estimation algorithms relative to the performances of an adaptive control system. There were
considered two types of parameters estimators: the classical recursive least square (RLS)
estimator and respectively, a non-recursive estimator based on Givens orthogonal transformation.
All study cases considers as plant a synchronous generator connected to an infinite bus through a
long transmission line. There is presented a mathematical model of the considered synchronous
generator process and it is also described the implementation algorithm of the non-recursive
parameters estimator based on Givens orthogonal transformation. The comparative studies are
conducted considering the both cases of an open and a closed loop structure's influence over the
parameters estimation. Also a comparative study is done regarding the usage of RLS estimator
and respectively the non-recursive estimator based on Givens orthogonal transformation. The
simulation results show that the evolution of the estimated parameters doesn't represent a trustful
criterion for evaluating the control system performances. Therefore, in the same simulation
conditions using different parameters estimators the simulations show different temporal
evolutions of the estimated process parameters.
