System and method for stabilizing an alternating voltage network

The invention relates to an installation (1) for stabilizing an alternating voltage network (2) with a converter (3) which is connected to the alternating voltage network and adapted to exchange reactive power to the AC voltage network. The invention is characterized by a throttling device (12) with variable choke coils (14) which is connected to the alternating-voltage network, as well as a regulating device (17) that is adapted to regulate a reactive power in the AC voltage network by means of the converter and means of the throttle arrangement , The invention further relates to a method for stabilizing the alternating-voltage network by means of the inventive system.