Economic Optimization of Gas-steam Combined Cycle Energy Station

Gas-steam combined cycle can greatly improve energy efficiency when it is used in cogeneration, and its combustion products are pollution-free. Therefore gas-steam combined cycle has been widely used in recent years. In the present paper, the nonlinear mathematical models of different equipment in an energy station are established, including gas turbines, waste heat boilers, steam turbines and gas boilers. Then the objective function and constraints of economic optimization model are proposed. In order to solve the nonlinear optimization model more efficiently, equipment models are linearized. Finally, the commercial solver CPLEX is used to solve the optimization problem. A case study is given based on an real energy station to illustrate the economic operation results.