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ENERCON E-40 Operating Instructions
Page 9 of 96
The main focus for development and design of all ENERCON wind energy converters has been the idea of minimizing the loads. Based on that, all components have been developed and designed accordingly. The result is a turbine that convinces inter alia with its low load spectrum and its long lifetime.
Power control with variable speed allows for an operation of the E-40 with optimum efficiency but without higher operating loads even in the partial load range and moreover prevents the occurance of undesirable power spikes. Therefore a good energy yield and a high quality of the power that is fed to the grid are guaranteed.
1.1 The ENERCON concept
An essential feature of the ENERCON concept is the gearless drive. The key components of the E-40 are the ring generator, rotor and grid management system.
The rotating part of the ENERCON ring generator and the rotor of the E-40 form a single unit. The generator is flanged directly to the rotating part of the rotor hub so that this part rotates with the same low number of revolutions. The absence of a gear box and other fast rotating components reduces
energy losses between rotor and generator,
sound emissions,
mechanical wear and tear,
oil losses and
mechanical friction losses.
The power generated by the E-40 generator is fed to the connected utility grid via the ENERCON grid management system while the E-40 can adapt itself to the prevailing grid parameters like grid voltage and frequency in order to guarantee the desired power quality for supporting the grid in case this is necessary.
1.2 Generator
The E-40 ring generator is directly driven by the turbine rotor (rotor blades). The generator rotor is directly connected to the rotor hub and therefore does not need a bearing of its own. The E-40 generator delivers its rated power of 500 kW for the standard operation mode already at a rotor speed of 38 rpm. The multipole
ENERCON generator whose operation is based on a synchronous generator has been especially designed for this purpose.
By further development of a classical synchronous generator model a very high efficiency could be achieved. The E-40 generator reaches an efficiency of about
94 % over its whole range of operation. Compared to similar solutions in hydroturbine construction, the E-40 generator stands out due its low weight.
Short description of the E-40
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