Individual pitch control of wind turbine based on loads estimation

Analysis and design of a tower motion estimator for wind turbines

“…Thus, the system (9) is observable. Lemma 4.1 indicates that use of observers can reconstruct the tower disturbance based on the periodic model (9). However, it is non-trivial to design an observer based on periodic models, the periodic model (9) can be transformed into a timeinvariant model, as discussed in the following section.…”

“…However, finding the analytical expression of Φ(t, t 0 ) and W 0 (t 0 , t f ) is not trivial for timevarying systems like (9). Nonetheless, there is a theorem proposed by [14] that can examine the observability without computing the state transition.…”

“…ANALYSIS OF THE SYSTEM OBSERVABILITY This section examines the observability properties of the linear system (9). Subsequently, transformations are introduced which transform the linear time-varying system into a timeinvariant system, for which a substantial body of mature estimation theory can immediately brought to bear upon the design of tower disturbance estimator.…”

“…In addition, an observer was employed to estimate the unknown system states for state-feedback control strategies [8]. Moreover, previous work [9] proposed a method to estimate blade load based on sensors locating at the non-rotating turbine structure. Nevertheless, analysis of the observability of the structural turbine models provides useful insights of how much information of the unknown dynamics can be extracted from the available measurements.…”

Investigation of an octagon-shaped chimney solar power plant

“…The use of wind power for generating electricity has been constantly and rapidly increasing over the last few decades, and according to all predictions and goals set by international authorities, this trend is likely to continue (Sawyer, 2016). Further increases of wind power exploitation require the production of larger wind turbines with higher unit power output (Jelavic et al, 2008;Tadzhiev et al, 2009).…”