New Large Variable Speed Drive for Pump-Storage Stations

摘要

The drive system of the new pump-storage station Goldisthal, Germany, is presented. Two of in total four electrical machines (300 MVA each) are designed as cyclo-converter driven doubly-fed induction machines. The cyclo-converter supplied by ALSTOM is one of the largest in the world. Major benefits of this innovative concept are the increase of the turbine efficiency and the high dynamic power control for the stabilisation of the grid. On the basis of simulations the control performance of the drive system is shown. Measurement results of particular operation modes made on site are analysed.