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Design and testing of a cost effective variable speed drive train by smooth torque control

Obiettivo



Objectives

The objective is to design, build and test a windturbine with 20% price/energy production ratio improvement, compared with the standard 'state of the art turbine. This will be proven by operation of both turbine types in identical circumstances. The NedWind 30 Series turbine at ECN in Petten (operating since May 1995, CIWI certified in December 1995) will be used as reference. The latter is a stall regulated turbine with Active Stall Control and a very competitive price/energy production ratio. The project is mainly funded by the EC, the Dutch Government (NOVEM) and NedWind.


Technical Approach

Basically rotor and E-system had to be replaced. Restrictive parameters are:
rotor tilt moment; tilt moment on nacelle bedplate; tower clearance; gearbox loads; envelope (generator); economics.
Standard RL41 and optimized blade design analysed.
Various designs for flapping and teeter hinges. Hydraulic and electric/mechanical actuators studied for pitching.
High ratio to reduce torque on high speed stages. Rated high speed shaft rotational speed: 2500 rpm. Power increase up to 400 kW considered realistic for gearbox when extreme torque peaks equal those in earlier turbine.
Torque and rotational speed controllable. Constant lambda control (by controlling converter current) if there is no restriction for noise emission and windspeeds below rated. Blade pitch controlled rotor speed above rated windspeed.
Safety system differs (fully redundant aero- and mechanical brake torque not allowed to increase). Independent blade pitch control. For teeter rotor loads and tower clearance appeared manageable; asymmetric pitching cause too high tilt moments in flap-hinge options.


Expected Achievements and Exploitation

Concept design review was in April 1996. System engineering will start after embedding concept study results in the NedWind R&D program. A prototype is planned for installation on ECN site early 1997. The NedWind turbine at the same site is subject to measurement program to ensure proper comparison.
In view of restrictions for the NedFlex design, the option of using RL41 or optimal designed blades is chosen.
Configuration with 400 kW nominal power and 45m hub height satisfies requirement of 20% price performance ratio reduction and complies with functional specifications. From technical viewpoint the design with optimized rotor blade, combined with teeter hub is preferred. From financial viewpoint initial cost to design and produce a new blade is a disadvantage. Asynchronous generator combined with frequency converter is most reliable option. Steel polygon tower of the soft-soft type was chosen as most cost effective.

Campo scientifico (EuroSciVoc)

CORDIS classifica i progetti con EuroSciVoc, una tassonomia multilingue dei campi scientifici, attraverso un processo semi-automatico basato su tecniche NLP. Cfr.: Il Vocabolario Scientifico Europeo.

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Programma(i)

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Coordinatore

Nedwind Rhenen BV
Contributo UE
Nessun dato
Indirizzo
54 BIS,Ravenswade
3910 AC Rhenen
Paesi Bassi

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Costo totale

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