Principles

The principle of controlling a wind turbine with a variable transmission ratio (SPG) combined with a synchronous generator was successfully verified for the first time in 1987 on an experimental wind turbine (Orkney LS1) having an installed output of 3 MW.

The gearbox for this turbine was designed and delivered by Mr. R. Hicks, Chairman of ORBITAL2. Since that time this unique solution has
profi ted from signifi cant technical development and in comparison with competing products represents a highly effi cent, responsive, cost effective and reliable conception.

The wind turbines of Wikov Wind company represent a new generation of very reliable and economically effective turbine installations with a simple high voltage synchronous generator connection to the grid.

The system of variable transmission ratio (SPG) as applied in the W2000 turbine enables a continuous variation of the transmission ratio in accordance with the force of wind and the rotor speed.

The higher transmission ratio makes it possible to produce electric energy at a low wind speed and on the other hand the automatic reduction of the transmission ratio allows production at the higher wind speed, whilst at the same time the gearbox and the generator are protected against excessive torque. SPG is a mechanical system utilizing a low power hydrostatic shunt transmission that harness the kinetic energy of the rotor and which fully substitutes very expensive power electronic appliances.