LTi REEnergy

LTi REEnergy offers complete PITCH systems for wind turbines and marine current turbines. The complete systems for rotor blade adjustment are characterised by their dynamic control behaviour, exact positioning of the rotor blades and their suitability for use in offshore opera-tions. With the increasing demands for wind turbines which can also constructed in locations with extreme climatic conditions, the demands placed on the systems and components also rise. Whether offshore, the cold climate version (CCV) or hot climate version (HCV), LTi REEnergy is able to meet the challenges of demanding locations. On the basis of many years' experience, a servo controller – the PITCHmaster II – has been developed for the rough operating conditions in the rotor hubs of wind turbines. The PITCH-master II forms the heart of the design of the CCV systems. Through the use of the PITCH-master II in the electric PITCH system of the wind turbine, installation altitudes of up to 3,000 metres and temperature ranges from -30 °C to +70 °C possible.PITCH System Cold Climate Version – Prepared for Extreme Climatic Condi-tions

LTi REEnergy has a climate chamber at its disposal which makes it possible to simulate temperature situa-tions within the range from -40 °C to +80 °C. Twelve permanently installed temperature sensors record the temperature values at freely selected measuring points. By means of a permanently installed temperature re-corder it is possible to document all of the data and store them over several weeks. A complete PITCH system with all components can therefore be tested and optimised under extreme conditions. All components for electric PITCH systems are being continually refined, optimised in collaboration with customers and suppliers and made ready for series production.

The CCV system can be used without problems at am-bient temperatures of -20 °C to +50 °C. At the end of 2007 a CCV PITCH system was successfully put into operation in northern Mongolia.