Patent ID: 8240148

Claim:
A turbine system comprising: a turbine having a casing and a turbine rotor rotatably attached into the casing; a main steam pipe connected to an upstream portion of the casing of the turbine; a control valve provided with the main steam pipe, the control valve controls a flow rate of steam discharging into the casing; a power generator coupled with the turbine rotor; and a starting control system including a starting controller and a control-valve controller, wherein the starting controller, during a estimation time interval, estimates thermal stress generated in the turbine rotor and an expansion difference between the casing and the turbine rotor due to thermal expansion, based on conditions of the steam discharging into the casing, temperature of the turbine rotor and a temperature of the casing, wherein the starting controller, for each time step, calculates an operation pattern of the control valve during the estimation time interval such that the thermal stress and the expansion difference, estimated respectively, can be controlled to be lower than defined values, thereby obtaining an operational amount of the control valve based on the operation pattern; and wherein the control-valve controller drives the control valve, based on the operational amount obtained by the starting controller.