Overall operation optimization method for circulating cooling water system of coupling water turbine

The invention discloses an overall operation optimization method for a circulating cooling water system of a coupling water turbine. The method comprises the steps that firstly, parameter monitoring and environment dry and wet bulb temperature monitoring are conducted on an operating assembly; calculating the heat exchange amount phi of the heat exchanger, obtaining the water supply temperature through the heat exchange amount phi, and establishing a heat exchanger thermodynamic model; establishing a system dynamic model and a cooling tower thermodynamic model; operation optimization is conducted on the coupled water turbine and the water pump through the system dynamic model, and optimization is conducted on the draught fan through the cooling tower thermodynamic model; monitoring the total energy consumption of the system, continuously adjusting the water supply temperature to obtain the operation parameters of the coupling water turbine, the water pump and the fan with the lowest operation energy consumpti