| 摘要 |
A wind energy installation is provided with a generator driven by a rotor with adjustable rotor blades to produce electrical energy, with a pitch adjustment device to adjust the blades, which pitch adjustment device includes an emergency circuit with an energy store to actuate a blade actuating motor. A shunt branch is provided with a current-balancing device in parallel with the energy store, the current balancing device configured to control the current shunt branch depending on a feedback current from the blade actuating motor. A current balancing circuit is provided with which the feedback current occurring in the overrunning state is dissipated in controlled fashion via a shunt branch and therefore the electrical energy store is protected from a damaging feedback current. This prevents a damaging rise in the voltage of the electrical energy store and a rise in the motor speed of the blade actuating motor during overrunning operation. |
