Real machine Test inversion research of J Pumped Storage Power Station

Abstract

Accurate prediction of transition process is an important issue in the design and operation of pumped storage power station. In this paper, combined with load rejection test of J Pumped-storage Power Station, the basic equation of water flow motion and the element matrix equation of the turbine were established first, and the calculation model was established through HYSIM software. Then for the 100% load rejection control condition, the inversion calculation and analysis of actual load rejection test under the same boundary condition were carried out. According to the comparison process line between numerical simulation and measured data of the surge-chamber water level, a comprehensive combination calculation was used to calibrate the impedance coefficient of surge-chamber. Finally, based on the calibrated impedance coefficient, a new calculation model was established, and the inversion calculation was carried out again. By comparing the numerical simulation and measured data of volute and tail pipe pressure, the pressure pulsation characteristics of the characteristic parameters of the unit were obtained, and the correction value of pressure pulsation was obtained. The calibration method and pressure pulsation correction method adopted in this paper can provide a reference for the inversion analysis of load rejection test in similar power stations.

Inversion Calculation and Analysis of Transient Process for Pumped Storage Power Station

“…At present, there are three types of analysis and research on the inversion calculation of the transition process of pumped storage power station: 1) The numerical simulation results are compared and analyzed with the measured data directly after the load rejecting test, and a reasonable correction amount is selected for the extreme values inversion analysis of other load rejecting conditions [1][2][3][4][5].2) Using different methods to extract the mean data of the measured data of the load rejection test, subtracting the mean data from the measured original data to obtain the measured pressure pulsation data, and making appropriate corrections to the calculation results of other load rejection conditions according to the pressure pulsation level [6][7][8]. 3) The mean data of the measured data of the load rejection test is extracted by different methods, the measured pressure pulsation data is obtained by subtracting the mean data from the measured original data, and the measured pressure pulsation data is added to the average data of other similar calculated load rejection conditions to invert the instantaneous pressure change process of other similar load rejection conditions [9,10].…”

“…(4) Calculation deviation H d = (measured mean pressure in test condition H mean_test -calculated mean pressure in test condition H cal_test ) ×K 1 ×K 2 . (5) Predicted fluctuation pressure in similar condition H fluc_pre = measured fluctuation pressure in test condition by confidence H fluc_confid ×K 1 ×K 2.…”