METHOD FOR ESTIMATING A WIND SPEED IN A STABLE MANNER

A method for iteratively estimating a wind speed at a wind turbine is disclosed, said wind turbine comprising a rotor carrying a set of wind turbine blades, each wind turbine blade having a variable pitch angle. A minimum tip speed ratio, λmin, is derived, based on an obtained pitch angle, θ. The mi...

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Bibliographische Detailangaben
Hauptverfasser:	ATZLER Martin, SCHEEL Thomas, LARSEN Lars Finn Sloth, KRÜGER Thomas
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROLLING FUNCTIONAL ELEMENTS OF SUCH SYSTEMS HEATING INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT LIGHTING MACHINES OR ENGINES FOR LIQUIDS MEASURING MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK MECHANICAL ENGINEERING MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR PHYSICS PRODUCING MECHANICAL POWER REGULATING TESTING WEAPONS WIND MOTORS WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS
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Beschreibung
Zusammenfassung:	A method for iteratively estimating a wind speed at a wind turbine is disclosed, said wind turbine comprising a rotor carrying a set of wind turbine blades, each wind turbine blade having a variable pitch angle. A minimum tip speed ratio, λmin, is derived, based on an obtained pitch angle, θ. The minimum tip speed ratio, λmin, defines a limit between a stable and an unstable control region. An initial tip speed ratio, λinit>λmin, is selected, and an initial estimated wind speed, vinit, is derived based on the initial tip speed ratio, λint, and an obtained rotational speed, ω, of the rotor. An estimated wind speed, vest, is iteratively derived, based on the obtained rotational speed, ω, and the obtained pitch angle, ω, and using the derived initial estimated wind speed, vinit, as a starting point. The iterative process converges fast and reliably.