Turbine starting controller and turbine starting control method

A turbine starting control method for adjusting and controlling an amount of steam or gas flowing into a turbine using a control valve, comprising:

• a thermal stress predicting step of predicting, with respect to an assumed manipulated variable, a thermal stress generated in a turbine rotor over a prediction period from a current time to the future;
• and
• an optimization calculation step of calculating for each predetermined control period a manipulated variable optimum transition pattern while keeping the predicted thermal stress equal to or lower than a prescribed value under a constraint of plant operating conditions,
• wherein in the optimization calculation step, a value at the current time in the manipulated variable optimum transition pattern is determined as an actual optimum manipulated variable.

A turbine starting control method for a turbine having a control valve for adjusting and controlling an amount of steam or gas flowing into the turbine, comprising:

• a thermal stress predicting step of calculating a predicted thermal stress value in a prediction period with respect to each of manipulated variables at a plurality of points assumed in advance;
• and
• an approximate optimization calculation step of approximately calculating, from a maximum value of the thermal stress, an optimum manipulated variable that makes a turbine starting time shortest while keeping the maximum value of the thermal stress equal to or lower than a prescribed value under a constraint of plant operating conditions, for each control period through straightforward deterministic operation,
• wherein the approximate optimization calculation step includes outputting as an optimum turbine acceleration rate/load increase rate the optimum manipulated variable approximately calculated for each control period.