A turbine control system is provided including a fluid-flow estimator that estimates and tracks the wind or water flow using the measured motion of the support structure along with rotor rotation rate and blade pitch angle. If so, then the desired blade length is calculated using sensed rotor rotation rate, sensed blade length, estimated tower velocity, estimated wind flow, desired generator torque, and desired rotor rotation rate to achieve a desired rotor rotation rate and to damp tower velocity. At block 310 the desired blade pitch angle and generator torque are calculated using sensed rotor rotation rate, sensed blade pitch angle, estimated tower velocity, estimated tower position, estimated wind flow, and desired rotor rotation rate to achieve a desired rotor rotation rate and to damp tower motion.
U.S. Pat. No. 4,420,692, to Kos, et al discloses an accelerometer disposed on the support tower of a wind turbine electric generating system in the vicinity of the rotor. The Kos, et al and Harner, et al patents (U.S. This makes for a mathematically and implementationally convenient linear time invariant state model. Here the term wind flow is used to describe any and all wind model parameters and variables including the wind speed and higher order derivatives, and natural frequencies and damping coefficients. These blades may be of variable pitch (selectively rotatable about their longitudinal axes) in order to alter the angle of attack relative to the incoming wind flow, principally for power shedding in high flow velocities.
- Tener más de 40 años
- Músculos muy tensos
- Principales síndromes dolorosos
- (3) Conversion efficiency from water column motion to air motion: ηa=0.9 to 1.0
- Nuevas normas en materia de seguridad PCA
- Evita colocar objetos innecesarios
- Los esguinces y las sobrecargas
The present invention provides a method and a controller for operating a wind turbine in order to obtain greater efficiency in conversion of wind energy to electrical energy. Alternately, the nonlinear measurement equations are linearized about an operating point and the resulting two steady state K’s (one for acceleration alone and one for acceleration and position) precalculated and used without having to propagate covariances. The state vector cannot be estimated from tower acceleration and velocity measurements alone.
Dolores Musculares En Los Brazos
The controller controls the wind turbine to compensate for varying wind flows with knowledge of the wind flow and of the tower motion, and it also contains a tower motion damper that damps the tower motion. Although not stated in block 310, it will be understood by those skilled in the art that blade length alone or in combination with blade pitch angle may varied. It should be understood by those skilled in the art that the term “support structure” as used herein includes structures such as tethers wherein cables hold devices buoyed by water or lighter-than-air devices. Alternatively, these blades may be fixed pitch or stall-regulated, wherein blade lift and therefore power capture falls off dramatically as wind speed exceeds some nominal value. A blade parameter (for example blade length and or blade pitch angle) sensor 212 senses the pitch angle of the rotor blades and or the blade length for wind turbines that utilize extendible rotor blades.
The torque command 228 is used to alter the power generation and also affects the rotor rotation rate. Dolor lumbar dormir . The flow estimator results are then used in the turbine control system to properly adjust its operating point, to tune the controller, to control the rotor rotation rate, and to damp support structure oscillations. The fluid-flow estimator is used in the turbine control system to properly adjust its operating point, to tune the controller (Proportional, Integral, Derivative, PID, state space, etc.), and to damp support structure oscillations. The turbine response to wind flow and to tower motion are described and conventional (PI, PID, etc.) feedback control system design techniques are applied to design a controller with gains and command outputs that adapt to changing wind flow, changing tower motion, changing rotor rotation rate, and also damp the tower motion by appropriately modulating the blade pitch/length and generator torque.