Method for determining reasonable operation threshold value of key parameters of thermal power generating unit

The invention relates to a method for determining a reasonable operation threshold value of key parameters of a thermal power generating unit, and the method comprises the steps: mining the reasonable operation threshold value of the key operation parameters of the unit under the conditions of different loads, back pressures, circulating water inlet temperatures, unit operation states and the like from historical data of unit operation through a big data mining means; the threshold value range is close to normal values of unit operation parameters and contains almost all normal operation values, and compared with an original alarm value and an original trip value of a DCS, the method has a strong guiding effect on operation personnel, a set of auxiliary operation monitoring system can be established through the method, the operation personnel are assisted in monitoring, and the operation efficiency is improved. The system can monitor the operation state of key operation parameters of the unit in real time, an