Patent ID: 9683540
Date: 2017-06-20
CPC Classifications: F01D,F03B,H02H,H02J,H02K,H02M,H02P,Y02E,Y02P

Claim:
1. A pumped-storage power plant connectable to an electric grid and comprising: one of (A) a water turbine and a water pump or (B) a reversible water pump turbine; an underground cavern located below a water storage basin; an electric synchronous machine located within the cavern, the synchronous machine being connected to the water turbine and the water pump or the reversible water pump turbine; and a frequency converter, wherein the frequency converter has a machine-side electrical element and a grid-side electrical element, said machine-side and said grid-side electrical elements are connected to one another, with one of the electrical elements being operable as a rectifier and another of the electrical elements being operable as an inverter, depending on an operation of the synchronous machine, wherein the machine-side electrical element is located with the synchronous machine within the cavern and is connected to a stator of the machine, and the grid-side electrical element is provided outside the cavern and is electrically connected to the machine-side element via a DC link, a size of the cavern thereby being minimized.