The demand for network compatibility, the stringent requirements in terms of the quality of the power generated and the widespread acceptance of synchronous generators in the power generation industry have all prompted an expansion of the design concept for the Wind turbines D8. The Wind turbines D8.2 introduces an innovative concept to wind energy production, yet one that has been tested over a period of decades. This new concept uses a gearbox/generator system that can achieve improvements in control and power quality while at the same time eliminating the need for a converter – thus clearing the way to the US market.
The synchronous generator of the Wind turbines D8.2 is connected directly to the main grid. Frequency regulation is achieved by means of a two stage planetary gearbox in combination with a torque converter as a superimposed drive with hydraulic coupling. This arrangement provides continuously variable converter control and eliminates the need for an inverter. This type of gearbox design has been used successfully in drive technology since about 1970, and it is supplied by the Wind turbines partner Voith Turbo, Germany.
The Wind turbines D8.2 has been manufactured since 2006, with the first units reaching the US market at the end of 2007. The Wind turbines D8.2 is characterized by high availability and exceptionally good network compatibility. The high durability of this system is demonstrated not least by the fact that it can be operated successfully at previously inconceivable elevation.
Since the beginning of 2008, a Wind turbines D8.2 turbine installed at an elevation of 4300 meters has been generating electricity for a mine site at Veladero in Argentina.
The increased availability of the Wind turbines D8.2 results in higher yields. It also further reduces operating costs, thanks to lower maintenance and repair costs.