Considerations about Parameters Estimation into a Minimum Variance Control System

The starting point to design a minimum variance control law consists in identifying linearized mathematical model (valid around an operating point) of nonlinear process, respectively the on-line estimation parameters this model. This paper presents comparative study regarding these for case when process operates open-loop, is integrated into closed-loop system specific control. comparison made both analytically (for general case) and through validation (by simulation) particularized induction generator wind energy conversion system. main contribution proving fact that, (under constraints imposed by law), estimates differ from real ones identified open-loop (in free mode, without constraints). In addition, as novelty, demonstrates steady-state, gain are identical, even though they calculated based on different linear parameters. Thus, closed-loop, parameter estimator rather allows gain, although it does not accurately estimate values (correctly estimated only open-loop).