A method for reducing vibrations of a tower of a wind turbine , the method comprising: continuously determining a torsional movement of the tower based at least in part on measurements obtained from one or more sensors by measuring, via the one or more linear acceleration sensors , a first movement at a first location of the wind turbine , measuring, via the one or more linear acceleration sensors , a second movement at a second location of the wind turbine , and subtracting the measured first movement from the measured second movement, wherein the first location comprises a tower center and the second location comprises at least one of a posterior side of the nacelle or an anterior side of the nacelle ; continuously determining , via a controller , a main pitch control command a plurality of pitch drive mechanisms of the wind turbine based on the torsional movement by: a) determining a fixed frame/Q pitch command using a secondary control device ; b) transforming the fixed frame/Q pitch command into a direct-quadrature (d-q) rotating reference frame based upon a rotor position and phase correction to provide the main pitch control command ; and operating the pitch drive mechanisms based on the main pitch control command so as to dampen the torsional movement of the tower . continuously determining a torsional movement of the tower based at least in part on measurements obtained from one or more sensors by measuring, via the one or more linear acceleration sensors , a first movement at a first location of the wind turbine , measuring, via the one or more linear acceleration sensors , a second movement at a second location of the wind turbine , and subtracting the measured first movement from the measured second movement, wherein the first location comprises a tower center and the second location comprises at least one of a posterior side of the nacelle or an anterior side of the nacelle ; measuring, via the one or more linear acceleration sensors , a first movement at a first location of the wind turbine , measuring, via the one or more linear acceleration sensors , a second movement at a second location of the wind turbine , and subtracting the measured first movement from the measured second movement, wherein the first location comprises a tower center and the second location comprises at least one of a posterior side of the nacelle or an anterior side of the nacelle ; continuously determining , via a controller , a main pitch control command a plurality of pitch drive mechanisms of the wind turbine based on the torsional movement by: a) determining a fixed frame/Q pitch command using a secondary control device ; b) transforming the fixed frame/Q pitch command into a direct-quadrature (d-q) rotating reference frame based upon a rotor position and phase correction to provide the main pitch control command ; and a) determining a fixed frame/Q pitch command using a secondary control device ; b) transforming the fixed frame/Q pitch command into a direct-quadrature (d-q) rotating reference frame based upon a rotor position and phase correction to provide the main pitch control command ; and operating the pitch drive mechanisms based on the main pitch control command so as to dampen the torsional movement of the tower . <EOS>