“…From point of view of control of overall system, active research area include sliding mode control [7,8], model predictive control [9][10][11], adaptive control, [12,13] and their references, I/O feedback linearization [14], robust control [15], artificial neural networks and fuzzy control [16,17]. In [2,8,9] a set of observers are analyzed like: super-twisting observer, an observer based on ASTESJ ISSN: 2415-6698 generalization of the phase locked-loop technique, a simple Luenberger observer, full order and reduced order adaptive system.…”