POWER GENERATING APPARATUS OF A RENEWABLE ENERGY TYPE AND OPERATION METHOD THEREOF

摘要

A power generating apparatus of a renewable energy type, such as a wind turbine generator has a hydraulic transmission with a hydraulic pump driven by a rotating shaft coupled to a rotor and a hydraulic motor which in turn drives an electrical generator to provide power to an electricity grid. The transmission controller includes a torque limiter which limits the torque generated by the hydraulic motor to avoid generator pole slip which may arise due to a drop in the terminal voltage or field strength of the hydraulic motor, for example in response to a fault. The effect is that the apparatus can be operated without risk of pole slip even with the electrical generator connected directly to the electricity grid.