Optimization of CCGT operating modes at variable loads taking into account equivalent operating hours

Abstract

The optimal control of the operating modes of combined cycle power plants is a difficult scientific and practical task, due to the difficulty of taking into account the real technical condition of the equipment, the particularities of the operating modes of a combined cycle gas turbine (with one or two operating gas turbines) and other factors. To determine the optimal regime of combined cycle unit with heat recovery steam generator at variable loads, the method of calculating equivalent operating hours (equivalent operating time) was used, based on the accumulation of damageability from creep and low-cycle fatigue of the main equipment of the combined cycle unit (gas, steam turbines and heat recovery steam generators). The equivalent operating hours and economic parameters of the 450 MW combined cycle power plant were calculated and the optimal operating mode of the main equipment was determined while reducing the load during night off-peak hours.