Wind_Energy_Essentials_Lecture 8

G tower foreaft loads on blades due to wind gusts

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: aws have been developed. βopt Kω2 ω wind Measured Rotor Speed Turbine τg Region 3 Control • Objective: Maintain rated power • Holding τg = τrated (constant) and using β=βopt to track ωrated • Ref: J. Laks, L. Pao, and A. Wright, Control of Wind Turbines: Past, Present and Future, American Control Conference, 2009. wind Rated Rotor Speed Error PID τg βcmd Turbine Measured Rotor Speed 24 11/9/2010 Region 3 Control • Issues: – Excitation of flexible modes, e.g. Tower fore/aft – Loads on blades due to wind gusts • Advanced control methods – Reduce tower fore/aft with notch filters and/or accelerometer measurements in the nacelle – Use individual blade pitch control to reduce bending on each blade – Reduce drivetrain vibrations by adding a small generator torque ripple computed by filtering the rotor speed measurement. Individual Pitch Control Ref: A. Ozdemir, P. Seiler, G. Balas, Effects of Disturbance Augmented Control Design for Wind Turbines, Submitted to Journal of Mechatronics 25 11/9/2010 Results Under Steady Wind 1% Turbulent Wind 26 11/9/2010 5% Turbulent Wind 5% Turbulent Wind 27 11/9/2010 Fault Detection and Diagnostics • Reduce downtimes • Reduce maintenance costs • Prevent catastrophic failures Benchmark Problem • Benchmark problem given by: – Fault Tolerant Control of Wind Turbines – a benchmark model, Odgaard, P.F., Stoustrup, J., and Kinnaert, M. (2009) [5] • A generic 4.8MW turbine model with realistic sensor configuration • Faults in the sensing, actuation and drivetrain systems [5] Odgaard, P.F., Stoustrup, J., and Kinnaert, M. (2009). Fault tolerant control of wind turbines - a benchmark model. In Proceedings of Fault Detection, Supervision and Safety of Technical Processes. 28 11/9/2010 Sensor Configuration Sensor Rotor Speed Generator Speed Generator Torque Generator Power i-th Blade Pitch Angle Wind Speed Configuration Dual redundant Dual redundant Single string Single string Dual redundant Single string • Measurement challenges: – Noisy rotor speed measurements – Wind speed measurement with high bias • 3 types of faults: – Sensor bias, scale factor, frozen...
View Full Document

This note was uploaded on 02/26/2011 for the course EE 523 taught by Professor Dr.hopkins during the Spring '11 term at SUNY Buffalo.

Ask a homework question - tutors are online