Self-erecting onshore wind turbines with hub height above 120m - hybrid tower with hoisting device for self-assembly

  Hydraulic valve Copyright: ifas

The direct electromechanical actuation of directional control valves with high nominal size is, due to high required switching forces, still a challenge. As state of the art these valves are actuated by hydraulic power which is controlled by a much smaller valve, the pilot valve. Aiming to reduce the number of components, which are necessary in a hydraulic system, the pilot valve should be removed. Therefore it is necessary to develop a new actuation system which can apply the required forces and strokes, while keeping in restrictions of the dimensions and dynamics.

Benefit Procedure
Reduction of material, transport and erection costs of a wind turbine

Load modelling of the WTG during construction / final stage

Guidelines for the optimized dimensioning of self-constructed WTG

Modeling of the lifting and stabilizing device

Simulation of the lifting process on the basis of different control approaches


New approach to the construction of wind turbines

This research project aims to increase the electricity yield by increasing the hub height while at the same time reducing the main investment costs by reducing the erection costs as well as the planning effort through practical design tools, which are to be achieved by developing a self-erecting steel hybrid tower. Subject of this research is the steel hybrid tower for a wind turbine (approximate dimensions: lattice tower: 120m, tubular steel tower: 65m). To reduce the erection costs, the plant will be erected conventionally up to a height of 120m (lattice tower) with the help of a crane. The tubular steel tower is assembled in parallel inside and temporarily founded. After completion of the lattice tower, the tubular steel tower is lifted by means of a strand lifting system in order to be able to erect the nacelle.



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  Hydraulic cylinder when lifting the steel pipe of the wind turbine Constructive concept

Finally, the tubular steel tower including the nacelle is moved to its final position by means of strand lifting. Hydraulic cylinders are used to absorb the horizontal forces, bending and torsional moments during the lifting process in the area of the transition piece between lattice tower and tubular steel tower. The implementation of the project results is guaranteed by the provision of summarizing guidelines.



The IGF project „Selbsterrichtende Onshore WEA mit Nabenhöhe größer 120m – Hybridturm mit Hebevorrichtung zum Selbstaufbau“, IGF-Projekt Nr. 20604 N, of the Forschungsvereinigung Stahlanwendung e. V. (FOSTA), Sohnstraße 65, 40237 Düsseldorf is founded via the AiF within the context of des programme for the funding of the joint industrial research (industriellen Gemeinschaftsforschung (IGF)) by the Federal Ministry of Economics and Energy on the basis of a resolution of the German Bundestag. We would like to take this opportunity to express our sincere thanks for this funding.

  Copyright: AIF