Robust Dynamic Sliding Mode Torque Observer for Wind Turbine

This paper investigates a new scheme in the design of a dynamic observer for generator torque estimation in the wind turbine. Using a dynamic sliding mode observer design that has never been used for a wind turbine, we increase the Lipschitz constant, which is equivalent to increase the operation range and increasing the observer's robustness to the nonlinear term. Design innovation is the use of dynamic gain in the design of the SMO and guarantee of asymptotic stability condition by  optimal control problem. The additional degree of freedom proposed by this dynamic formula is used to cope with the nonlinearity. Finally, using the real wind profile, the design procedure is implemented on the 100 kW wind turbine of the Sun and Air Research Institute and the results are also evaluated with the wind turbine simulator software FAST. Also, as the second contribution of this paper, by adding process noise and measurement noise to the turbine, the superiority of the proposed algorithm over others is investigated.