Inversion and Prediction for Pressure at Volute of Pumped Storage Power Station Considering Pulsating Pressure Suppression

This paper mainly investigates the inversion and prediction for pressure at volute of pumped storage power station (PSPS) considering pulsating pressure suppression. Firstly, an integrated mathematical model of simulation-decomposition-prediction is established. Secondly, taking the NH PSPS as an example, the dynamic characteristics of the mean pressure and pulsating pressure during the transient process under different closing law of guide vane (CLGV) is analyzed. On this basis, the evolution mechanism of pulsating pressure is revealed by analyzing the trajectory lines. Furthermore, the predicted pressure is conducted under the dual-unit load rejection. The results indicate that the model of simulation-decomposition-prediction can achieve the inversion and prediction calculation, the accuracy of extreme values reaches as high as 99.75%. The CLGV not only affects the mean pressure, but also influences the amplitude of pulsating pressure. The extreme point of mean pressure is concentrated at the point where the discharge is 0. The deeper the trajectory line enters the “S” zone, the greater the pulsating pressure, and the extreme value appear near the runaway line. These findings provide important insights for optimizing transient operations in PSPS.