FuturEnergy | Junio June 2016 Eólica. I+D | Wind Power. R&D www.futurenergyweb.es 91 ción y un conjunto de brazo de rotor izquierdo y derecho, están integradas dentro de la estructura de la torre. Los conjuntos de brazos de rotor pueden girar individualmente alrededor de la torre. Estos brazos del rotor están unidos de forma flexible por medio de cables de acero tensionados a un chasis central giratorio. Este enlace ofrece una solución ligera, comúnmente utilizada en puentes. El principal beneficio de esta solución de montaje flexible es que se pueden reducir la masa y las cargas. Un nuevo elemento para los aerogeneradores V29s es el cambio de lo que era un modo de funcionamiento de dos velocidades a velocidad variable mediante un generador de polos conmutables. Vestas ha conservado el principio generador de inducción, pero ha añadido un convertidor de alta potencia y un sistema de control del aerogenerador de última generación para cada aerogenerador individual. Un gran número de sensores están instalados en el demostrador para ayudar en las medidas y ensayos. Además, se ha instalado un sistema LIDAR en la parte superior de la estructura de soporte para la medición del campo de viento delante de los rotores. With this concept demonstrator, Vestas is challenging the core scaling rules that turbines have to grow in size to increase their energy output, with the associated transport and installation challenges in markets that have less developed roads and port infrastructure. Some markets could face additional challenges such as a lack of suitable heavy trucks and installation cranes for the current 2 MW and 3.45 MW volume product range. Many new load and control features will need to be developed, tested and proven to assess the technical and eventual commercial feasibility of the concept. The multi-rotor concept demonstrator uses four refurbished pitch-controlled V29225kW wind turbines (produced by Vestas from 1990 to 1997) with a 29-metre rotor diameter, mounted in a single support structure. The support structure comprises one central steel tower and two rotor arm assemblies arranged vertically at two levels. Two rotors are mounted on top of two conical bottom sections at a height of 29 metres and the other two at 59.5 metres, with a tip height of 74 metres. It is tailored to the sitespecific requirements associated with Risø, where there is a tip height restriction of 75 m. Between the two vertical operational levels there is a 30.5-m height interspacing. Two chassis units, each incorporating a yaw bearing, an active yaw system and a left and right rotor arm assembly, are integrated within the tower structure. The rotor arm assemblies can rotate individually around the tower. These rotor arms are flexibly attached by means of steel tension cables to a turnable central chassis. This linkage offers a lightweight solution commonly used for bridges. The main benefit of this flexible mounting solution is that it can reduce mass and loads. A new element for the V29s has been the switch from what was a two-speed operating mode with pole-switchable generator to variable speed. Vestas has retained the induction generator principle but has added a full-power converter and state-of-the-art turbine control system to each individual turbine. A large number of sensors are installed on the concept demonstrator to aid measurements and testing. In addition, a LIDAR system has been installed at the top of the support structure for measuring the wind field in front of the rotors.
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