Turbine system and method for starting-controlling turbine system

A method for starting-controlling a turbine system including 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 method comprises:
• estimating, by the starting controller of the starting control system, thermal stress generated in the turbine rotor during a estimation time interval, and an expansion difference, due to thermal expansion, between the casing and the turbine rotor, based on conditions of the steam discharging into the casing as well as a temperature of the turbine rotor and a temperature of the casing and then calculating an operation pattern of the control valve during the estimation time interval, for each time step, such that the thermal stress and the expansion difference estimated respectively can be controlled to be lower than defined values, respectively, thereby obtaining an operational amount of the control valve, based on the operation pattern;
• and
• driving the control valve by the control-valve controller of the starting control system, based on the operational amount of the control valve obtained by the starting controller.