Patent ID: 8104282

Claim:
A power generation complex plant comprising: a steam generating facility; a high-pressure steam header into which steam generated in the steam generating facility is supplied; a steam power generating facility which generates electricity by use of the steam supplied from the high-pressure steam header; a low-pressure steam header into which the steam flowing out of the steam power generating facility is supplied; a steam bypass facility which links the high-pressure steam header to the low-pressure steam header in such a manner as to bypass the steam power generating facility and which adjusts the volume, pressure, and temperature of the steam supplied from the high-pressure steam header on the basis of a bypass steam volume control command value and then supplies the steam to the low-pressure steam header; a steam consuming facility which uses the steam supplied from the low-pressure steam header; a low-pressure control unit which controls the volume of steam to be supplied to the steam power generating facility on the basis of the steam pressure in the low-pressure steam header when the steam pressure in the high-pressure steam header is higher than a preset threshold value; a high-pressure control unit which controls the volume of steam to be supplied to the steam power generating facility on the basis of the steam pressure in the high-pressure steam header when the steam pressure in the high-pressure steam header is lower than a preset threshold value; a control switch unit which compares the steam pressure in the high-pressure steam header with the threshold value to switch between control by the low-pressure control unit and control by the high-pressure control unit; a determining unit which determines that a desired steam volume of the steam consuming facility has reached an upper limit value of the volume of steam to be generated by the steam generating facility; and a steam bypass facility control unit which adds programmed to add a bias value to the bypass steam volume control command value of the steam bypass facility to generate a new bypass steam volume control command value when the determining unit determines that the desired steam volume has reached the upper limit value, in order to control the volume and pressure of the steam passing through the steam bypass facility on the basis of the new bypass steam volume control command value.