Performance optimization method for three-pressure reheating combined cycle power plant system

The invention discloses a performance optimization method for a three-pressure reheating combined cycle power plant system, and belongs to the technical field of gas turbine combined cycle power generation. Comprising the following steps: acquiring key equipment parameter limits used by the combined cycle power plant; obtaining heat regulation key parameters and margins of the gas turbine; determining a combined cycle power plant operation envelope; establishing a heat balance model of the gas turbine and the combined cycle power plant, and calibrating the efficiency of a gas compressor and a turbine and the efficiency of a high-pressure cylinder; defining a main steam temperature and reheat steam temperature matching strategy and an optimization boundary; establishing a combined cycle prior performance monitoring system to access real-time operation key parameters and environmental conditions; the combined cycle heat efficiency under different parameter combinations is calculated in a traversal mode through