Cooling water system energy-saving control method and system based on optimal overall energy efficiency

The invention discloses a cooling water system energy-saving control method and system based on overall energy efficiency optimization, and the method comprises the steps: building a historical data carrying out the real-time monitoring of the environment of a refrigeration station and a refrigeration system, and obtaining operation parameters, so as to build the historical database; a historical data matching step: acquiring current environment temperature and humidity data, matching the current environment temperature and humidity data with data in a historical database, and acquiring the lowest overall power P1 of the refrigeration station under the current temperature and humidity in the historical database and corresponding operation parameters; and a parameter optimization step, wherein the lowest overall power is achieved by gradually adjusting operation parameters. The operation state of the refrigeration equipment and the parameters of the cooling water system are monitored in real time, and the oper