System for transmitting electrical power

A system for transmitting electrical power between a first alternating voltage network and a second alternating voltage network, the system comprising:

• an unregulated rectifier connectable to the first alternating voltage network on an alternating voltage side;
• a direct voltage link;
• a self-commutated converter connectable to the second alternating voltage network and connected to said unregulated rectifier via said direct voltage link;
• and
• a network generation device connectable to the first alternating voltage network, said network generation device generating an alternating voltage in the first alternating voltage network, said network generation device is set up for an exchange of reactive power and active power with the first alternating voltage network.

A method for stabilizing a network frequency in a first alternating voltage network connected to a system for transmitting electrical power between the first alternating voltage network and a second alternating voltage network, which comprises the steps of:

• providing the system with a self-commutated converter which is connectable to the second alternating voltage network and connected to an unregulated rectifier via a direct voltage link, the unregulated rectifier is connectable to the first alternating voltage network on an alternating voltage side;
• and
• providing the system with a network generation device which is connectable to the first alternating voltage network, the network generation device provided for generating an alternating voltage in the first alternating voltage network, the network generation device is set up for an exchange of active power and reactive power with the first alternating voltage network;
• and
• regulating the network frequency in the first alternating voltage network by an adjustment of a voltage at a direct voltage terminal of the self-commutated converter.