Blade pitch

About: Blade pitch is a research topic. Over the lifetime, 5321 publications have been published within this topic receiving 63134 citations.

Optimal Generation Control of Interconnected Power System Including DFIG-Based Wind Turbine

Abstract: The impact of wind power with higher size of penetration becomes significant for frequency control problem due to its inconsistent nature and lack of frequency support from the wind turbine units. The frequency can be managed using enhanced control of inertia and droop characteristics. However, at very low and high speeds, the adjustment of pitch angle of wind turbine is necessary so that the aerodynamic power produced remains within the designed limits. This paper discloses the design of proportional integral (PI) control algorithm to adjust pitch angle of doubly fed induction generator (DFIG)-based wind turbine (WT) integrated with two-area-interconnected power system. Here, a heuristic gravitational search algorithm (GSA) is employed to optimize the gains of PI controllers used for pitch angle adjustment and governor speed control of wind turbine, frequency regulation, and tie-line power flow control. The influence of optimal gains by GSA is compared with genetic algorithm (GA) and ant colony o...

Improved control of individual blade pitch for wind turbines

Abstract: This paper is concerned with improved control of individual blade pitch for wind turbines. The controller is based on the proportional-integral-plus (PIP) algorithm, considered an extension of conventional proportional-integral/proportional-integral-derivative (PI/PID) controllers, in which full state variable feedback control is implemented directly from the measured input and output signals. In particular, the design and implementation of a PIP algorithm based on either standard or advanced individual blade pitch control is presented in the paper. The preliminary results reported in this article, based upon simulations using a linear transfer function representation of the pitch control system, have demonstrated that the proposed approach is robust to stochastic influences arising from both parametric uncertainty and system disturbance. The work presented in this paper constitutes a step towards the development of an advanced individual blade pitch controller.

Control apparatus for variable pitch propeller adjusting devices

Abstract: This invention relates to control apparatus for variable pitch propeller adjusting devices. It is particularly well suited for aircraft propellers but may serve for ship propellers and fans with adjustable blades as well. Hitherto, in aircraft propellers with more than one blade adjusting...

The use of active controls to augment rotor/fuselage stability

Abstract: The use of active blade pitch control to increase helicopter rotor/body damping is studied. Control is introduced through a conventional nonrotating swashplate. State variable feedback of rotor and body states is used. Feedback parameters include cyclic rotor flap and lead-lag states, and body pitch and roll rotations. The use of position, rate, and acceleration feedback is studied for the various state variables. In particular, the influence of the closed loop feedback gain and phase on system stability is investigated. For the rotor/body configuration analyzed, rotor cyclic inplane motion and body roll-rate and roll-acceleration feedback can considerably augment system damping levels and eliminate ground resonance instabilities. Scheduling of the feedback state, phase, and gain with rotor rotation speed can be used to maximize the damping augmentation. This increase in lead-lag damping can be accomplished without altering any of the system modal frequencies. Investigating various rotor design parameters (effective hinge offset, blade precone, blade flap stiffness) indicates that active control for augmenting rotor/body damping will be particularly powerful for hingeless and bearingless rotor hubs.