Robust Observer-based Fuzzy Control for Variable Speed Wind Power System

Robust MPPT Observer-Based Control System for Wind Energy Conversion System With Uncertainties and Disturbance

“…The WECS is not an exception, it is also strongly affected by the disturbance and the uncertainties. Recently, there are several studies paying attention to control of the WECS with existence of the uncertainties and/or disturbance [9], [20]- [23]. In paper [9], the time-varying uncertainty affected WECS; however, the uncertainty in this case was only impacted to the mechanical part of WECS and the system disturbance was not considered in this work.…”

“…In paper [9], the time-varying uncertainty affected WECS; however, the uncertainty in this case was only impacted to the mechanical part of WECS and the system disturbance was not considered in this work. In paper [20], the WECS was modeled in term of the uncertain T-S fuzzy model and then the robust observer-based controller was designed to estimate the wind speed. Nonetheless, the uncertainties in paper [20] must satisfy the bounded constraints.…”

“…In paper [20], the WECS was modeled in term of the uncertain T-S fuzzy model and then the robust observer-based controller was designed to estimate the wind speed. Nonetheless, the uncertainties in paper [20] must satisfy the bounded constraints. The highorder observer was also synthesized to estimate the wind speed for the WECS with the effects of the uncertainties in paper [21].…”

“…The active disturbance rejection controller was synthesized for the WECS in papers [22] and [23], but these two papers only consider the existence of the disturbance and did not concern the influence of the uncertainties. With above analyses, it is seen that the previous papers either deal with the uncertainties [9], [20], [21] or take into consideration of the disturbance [22], [23]. To the best of our knowledge, up-to-now, there is not any paper considering the WECS system with the existence of both uncertainties and disturbance simultaneously.…”

“…On the basis of the above discussions, we are inspired to develop a new method for designing robust disturbance observer-based controller to track the optimal power point of WECS that is simultaneously influenced by time-varying uncertainties and the disturbance. The contributions of this paper are presented as follows i) Unlike the previous papers that ignored the effects of the uncertainties and disturbance of WECS system [10]- [16], or merely considered the impacts of the uncertainties [9], [20], [21] or disturbance [18], [19], the WECS system in our paper is simultaneously influenced by both the uncertainties and disturbance. ii)…”