Variable hydraulic transmission for wind turbines

Electricity is generated from wind or water turbines 15, 16 using a hydraulic transmission between the turbines and the shared generator 130. The transmission is controllable so that the blade 40 tip speed ratio (TSR) of the turbine 15, 16 is infinitely adjustable independently of the generator 130 speed, so turbine efficiency can be improved. Adjustment may be achieved by an adjustable pump 50 or motor 120 e.g. using a swash plate. The system could alternatively control the pressure or flow of fluid to or from an accumulator 100, 110.

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