Gas-steam combined cycle power generation system operation optimization method

The invention discloses a gas-steam combined cycle power generation system operation optimization method. The method mainly comprises the steps that firstly establishing a gas power generation system technological process model and a steam power generation system technological process model; then, determining a system energy efficiency index, an environment evaluation index and a thermal economics evaluation index; analyzing weight indexes of the primary energy utilization rate, the efficiency, the CO2 unit emission and the unit thermal economics cost of the system based on an entropy weight method, and establishing a comprehensive evaluation model; and finally, establishing an optimization model based on a particle swarm algorithm. According to the method, a function relationship between important control parameters (IGV opening and natural gas flow) of the gas-steam combined cycle power generation system and a comprehensive evaluation result is fitted, and a technological process model and a comprehensive e