Extensive expertise in

variable speed projects for hydro

With our variable speed drive technology, pumped storage plant

operators are better able to meet the need for peak supplies

of power while in turbine mode. Also, the plant achieves higher

efficiency levels in partial-load conditions because the machine

speed can be adjusted to meet the grid’s changing power

requirements while maintaining the turbine close to its highest

efficiency point. At last operators have greater control over the

plant’s performance in pump mode, by being able to control

the power consumed from the grid while refilling the upper reservoir.

However, in order to react to changing wind and solar power

conditions that can undermine grid reliability, pumped storage

power plants need to have greater flexibility and shorter

response time. Reversible pump turbines with variable speed

motor-generator provide adjustable discharge and power in

both turbine and pump operation, plus enhanced grid services

like virtual inertia.