Generator-stream turbine-turbocompressor string regulated by variation of a mains power supplied and by a live steam feed and method for operating the same

A generator-steam turbine-turbocompressor string, comprising:

• a variable frequency generator;
• a steam turbine;
• a turbocompressor which is driven by the generator and/or the steam turbine;
• a frequency converter;
• and
• a live steam valve,
• wherein the generator and the steam turbine are coupled together to form a shaft assembly,
• wherein the generator may be electrically coupled into an electrical network for the purpose of feeding in a mains power to the generator-steam turbine-turbocompressor string, wherein
• the steam turbine is connected to a live steam feed facility for feeding live steam to the steam turbine,
• wherein a rotation speed of the generator-steam turbine-turbocompressor string is regulated by varying the mains power fed in and by a feed of live steam,
• wherein the frequency converter electrically couples the generator to the electrical network in order to supply the mains power to the electrical network and a power of the generator is regulated,
• wherein the rotation speed of the generator-steam turbine-turbocompressor string is regulated using the frequency converter wherein a rotation speed of the shaft assembly is linked to the frequency converter by a first rotation speed feedback device,
• wherein the live steam valve feeds the live steam from the live steam feed facility to the steam turbine whereby the live steam valve is used to regulate the feed of live steam, and
• wherein a second rotation speed feedback device which is linked to the rotation speed of the shaft assembly is used to actuate the live steam valve, so that the rotation speed of the shaft assembly is regulated using the live steam valve.