Steam turbine power plant

1. A steam turbine power plant, comprising:

a heat source equipment that heats a low-temperature flow by applying a heat medium and thus generates a high-temperature flow;

a steam generator that generates steam using the high-temperature flow generated by the heat source equipment;

a steam turbine driven by the steam generated by the steam generator;

an electric generator that converts rotational motive power of the steam turbine into electric power;

a controller that controls a plant load; and

a steam turbine starting control device that predicts a value of a startup constraint due to a change in physical quantities of the steam in the steam turbine, and controls the controller according to the predicted value;

wherein the steam turbine starting control device includes:

at least one fundamental startup constraint prediction device calculating from a control input variable of the controller a prediction period of fundamental startup constraint data about a fundamental startup constraint which is short in response time with respect to the change in the physical quantities of the steam;

at least one reference control input variables calculating device calculating such a reference control input variable of the controller as the value predicted and calculated by the fundamental startup constraint prediction device will not exceed a corresponding limit value;

at least one other startup constraint prediction device calculating a corresponding prediction period of data about one of other startup constraints longer than the fundamental startup constraint in response time, from the prediction period of reference control input variables data;

at least one other control input variables calculating device calculating such an other control input variable of the controller as the value predicted and calculated by the corresponding other startup constraint prediction device will not exceed a corresponding limit value; and

a control signal output device that outputs a command value to the controller according to a value selected from the reference control input variable and the other control input variable.

2. The steam turbine power plant according, to claim 1 , wherein:

the controller includes

a heat medium flow controller that controls a flow rate of the heat medium supplied to the heat source equipment, and

a main steam flow control valve that controls a flow rate of a main flow of the steam supplied to the steam turbine;

the heat medium flow controller is controlled to bring a predicted value of the startup constraint close to a corresponding limit value; and

the main steam flow control valve is controlled to bring a current value of the startup constraint close to a corresponding limit value.

3. The power plant according to claim 1 , wherein:

a plurality of kinds of startup constraints are selected as those of the other startup constraint; and

one set of devices including the other startup constraint prediction device and the other control input variables calculating device are provided for each of the plurality of kinds of startup constraints.

4. The power plant according to claim 3 , wherein:

a plurality of kinds of startup constraints are selected as those of the fundamental startup constraint; and

one set of devices including the fundamental startup constraint prediction device and the fundamental control input variables calculating device are provided for each of the plurality of kinds of fundamental startup constraints.

5. A planned-startup curve creating system, comprising:

the steam turbine starting control device of claim 1 ; and

a plant simulator that simulates characteristics of the steam turbine power plant, the simulator being further configured to exchange signals with the steam turbine starting control device and sample the command value addressed to the controller during a startup period calculated by the steam turbine starting control device.