Steam turbine unit system and control method thereof

The invention discloses a steam turbine unit system and a control method thereof. The steam turbine unit system comprises an operation unit and an outage unit; the operation unit comprises a first operation unit; the first operation unit comprises an operation unit condensate system and an operation unit condensate user; the operation unit condensate system comprises an operation unit condensate pump; the operation unit condensate pump is connected to the operation unit condensate user through a first pipeline to deliver condensate of the operation unit condensate system to the operation unitcondensate user; the operation unit condensate pump is connected to an outage unit condensate user through a third pipeline to convey the condensate of the operation unit condensate system to the outage unit condensate user; and a second valve is arranged on the third pipeline. The steam turbine unit system adopting the scheme can solve the problem that when the current steam turbine unit is in operation, a large amount o