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A pumped-storage power plant, such as an electric unit can include a frequency converter and a rotating electric synchronous machine, the machine being provided in a cavern. The frequency converter can include at least two elements which can be used as inverters or as rectifiers according to the ope

A pumped-storage power plant, such as an electric unit can include a frequency converter and a rotating electric synchronous machine, the machine being provided in a cavern. The frequency converter can include at least two elements which can be used as inverters or as rectifiers according to the operating mode of the machine, for example during the operation of the motor or during the operation of the generator. The machine-side element can be provided within the cavern, and the network-side element can be provided outside of the cavern.

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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 mach

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; anda 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. 2. The pumped-storage power plant as claimed in claim 1, comprising: a grid transformer and/or a grid filter, which are provided outside the cavern. 3. The pumped-storage power plant as claimed in claim 1, wherein each of the electrical elements of the frequency converter are alternately operable as a rectifier and an inverter for inductive generator operation, capacitive generator operation, inductive motor operation and capacitive motor operation. 4. The pumped-storage power plant as claimed in claim 1, wherein the frequency converter is a self-commutated voltage or current source converter comprising: a DC link connecting the machine side electrical element and the grid side electrical element. 5. The pumped-storage power plant as claimed in claim 1, wherein the frequency converter including the machine side electrical element and the grid side electrical element is an externally commutated converter. 6. The pumped-storage power plant as claimed in claim 1, wherein an electrical connection between the electrical elements of the frequency converter has less than 0.2% active power losses. 7. The pumped-storage power plant as claimed in claim 3, comprising: a grid transformer and/or a grid filter, which are provided outside the cavern. 8. The pumped-storage power plant as claimed in claim 7, wherein each of the electrical elements of the frequency converter are alternately operable as a rectifier and an inverter for inductive generator operation, capacitive generator operation, inductive motor operation and capacitive motor operation. 9. The pumped-storage power plant as claimed in claim 8, wherein the frequency converter is a self-commutated voltage or current source converter comprising: a DC link connecting the machine side electrical element and the grid side electrical element. 10. The pumped-storage power plant as claimed in claim 8, wherein the frequency converter including the machine side electrical element and the grid side electrical element is an externally commutated converter. 11. The pumped-storage power plant as claimed in claim 10, wherein an electrical connection between the electrical elements of the frequency converter has less than 0.2% active power losses.