4.7 Article

Smooth switching in power control of wind turbines using a combination strategy of hysteresis and modified middle regions

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Publisher

ELSEVIER
DOI: 10.1016/j.seta.2019.100585

Keywords

Variable speed wind turbine & its protection; Control; Smooth switching; Full wind profile; Hysteresis; Cubic spline; Middle regions

Funding

  1. Research Office of Sharif University of Technology, Tehran, Iran [QB950944]

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This paper presents a new method for protecting the variable speed wind turbines in switching between different regions. With the objective of power maximization, the controller is applied in all regions. Since usually different methods and algorithms are used in different regions for controlling the wind turbines, smooth transition between these controllers is necessary for the safety and protection of turbine parts and structure. A two degree of freedom mechanical model is used and the simulations are performed and verified by FAST. The turbine is controlled by a rotor angular speed controller in the second region and an inverse dynamic pitch controller in the third region. The transient shocks are reduced and controlled by introducing intelligent hysteresis and defining middle regions in switching between modes. The hysteresis prevents from unnecessary switches caused by wind variations; while the reference torque trajectory of middle regions controls the impulses. Simulations show that the hysteresis reduces the number of switches and the transient phases remove the impulses without a considerable effect on the performance and efficiency of the system.

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