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- W2314883487 abstract "This paper extends earlier work by the authors to include effects of actuator lag, error sensing and nonuniform turbulence on blade pitch control of fluctuating aerodynamic loads. The primary concern is the control of fluctuating loads due to turbulent winds during rotor operation. The rotor blades are utility scale and identical to those studied previously, as is the closed loop control system. This system includes a PID control law with variable gains to satisfy the critical damping requirement to minimize peaking of the closed loop output. The actuator model is generalized to account for response lag from zero to first and second order( i.e. actuator transfer function 1 = (a+ l)n ). The second order actuator (when n=2) may be the more realistic of the three for blade pitch control, and it is found that in uniform turbulence the derivative term in the PID control law plays a key role in increasing control effectiveness within the boundaries of constraints on control activity (i.e., blade deflections, rates and accelerations). Strengthening this role places a high premium on increasing the accuracy of error sensing (e.g., blade root flap moment fluctuations) in the control system. . The issue of side effects depending on which error is sensed (e.g., blade root flap or torque moments, or thrust) to command the control system in uniform turbulence is also examined. It is indicated that the choice between blade root flap moment or thrust depends on whether blade or tower fatigue damage rate is critical to reliable and long life operation of a wind turbine. This choice appears to be reasonably straight forward since control effectiveness and activity are similar in magnitude for error sensing of either of these fluctuating loads. The same is not true if fluctuating torque is sensed and controlled aggressively, in which case thrust and flap moment may be dangerously overCopyright" @default.
- W2314883487 created "2016-06-24" @default.
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- W2314883487 date "1999-01-11" @default.
- W2314883487 modified "2023-09-25" @default.
- W2314883487 title "Some effects of actuator lag, error sensing, and nonuniform turbulence on blade pitch control of fluctuating aerodynamic loads on HAWTs" @default.
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- W2314883487 doi "https://doi.org/10.2514/6.1999-31" @default.
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