ENERCON GmbH Wind Turbine E-141 EP4

Overview of Technical Details Rated power 4.200 kW Rotor diameter 141 m Hub height in meter 129 / 159 Wind class (IEC) IEC/EN IIIA WEC concept Gearless, variable speed, single blade adjustment WEC Components All ENERCON WEC components are subject to ongoing, systematic further development that enables us to maintain our technological edge over our competitors and ensure efficient solutions at all times. Our global production sites are synonymous with a unique depth of production ensuring system technology according to the very highest quality standards. Annular Generator The annular generator - comprising rotor and stator - forms the key component of the ENERCON wind energy converter design. Combined with the hub, it provides optimal energy flow. The sophisticated wind energy converter technology means maximum running smoothness, low sound emissions and a long service life. One special feature is that, thanks to the externally excited annular generator, there is no need for the use of permanent magnets that are manufactured from highly controversial neodymium (rare earths). The magnetic fields required for power generation are created electrically. Machine House All fixed-position nacelle components such as main carrier, ventilation modules and power electronics components are housed in the machine house. The entire drive train is borne by the main carrier and is subject to high dynamic stress that results in the highest quality requirements. Yaw Drive Yaw drives ensure optimal yaw control of the nacelle. During operation of the WEC, the nacelle is turned automatically to the wind in order to enable maximum WEC power. The number of yaw drives used varies according to the wind turbine type. E-module The E-module is borne by the wind energy converter tower base. Power cabinets and other components are arranged on different levels. They use inverters to transform direct current into alternating current that conforms to grid requirements. Inverter technology and control systems are among ENERCON's core competencies. Hub The hub constitutes the link between rotor blade and wind energy converter. It is part of the timetested ENERCON direct drive and forms a direct unit with the rotor's annular generator. The rotor unit is borne on the axle pin. It is manufactured from state-of-the-art spheroidal graphite cast iron in ENERCON's own foundry in order to conform to the highest quality requirements. Rotor Blade The innovative aerodynamic design of ENERCON rotor blades has won over customers time and time again. Maximum power, low noise emissions and minimal structural loads ensure an optimal yield in the widest variety of weather conditions. Tower ENERCON towers are designed for optimal load dynamics, and manufactured in several individual tower sections. Both steel and precast concrete towers are subject to the strictest quality standards to ensure later stability and a long service life. Depending on the wind turbine type and site, the towers are available in various hub heights. Foundation The foundation is the link between the tower and the subsoil, and bears all static and dynamic loads from the wind turbine. The ENERCON foundation concept thus offers standardised solutions for various foundations. Additional specifications are possible based on the geotechnical report at the site, allowing varying construction projects to be realised within a short time. WEC Technology The basic electrical design of any type of ENERCON WEC is identical. The rotor is directly connected, that means without intermediate gearbox, to the multi-pole, electrically excited annular generator. The electrical power produced by the generator is fed via a full-scale power converter into the electric network. The converter system itself consists of a rectifier, a DC link and several inverters. This is the major advantage of the annular generator. In electrical terms, it is completely decoupled from the grid. This enables a high level of rotor speed variability and, in turn allows for a more mechanically robust design with fewer moving parts. In addition to this the electrical properties of ENERCON WECs are solely determined by the inverters used and the corresponding FACTS- (Flexible AC Transmission System) controller.