Double Units Load Shedding Test and Simulation Analysis of Hydropower Station with Tailrace Surge Tank

Double units load shedding transient process of tailrace surge chamber shared is analyzed by field test and numerical simulation. The transient process simulation model is examined by field test. Based on the measured data, pulsation pressure of load rejection transient process at draft tube inlet was extracted by using the method of signal analysis, and it is applied to transient calculation. The impedance factor of the surge chamber, the rotary inertia of hydroelectric generating set, the model and parameters of the governor are identified and obtained respectively by using the measured data. The more accurate simulation model of the transient process is established, which makes the simulation results highly consistent with the test results. The model can be used to predict the double load rejection transition process under extreme conditions so as to ensure the safe operation of hydropower plants.