Powerhouse Vibration Characteristics of Disturbed Unit in Load Disturbance Test for Pumped-Storage Power Station

Abstract

In China, most pumped-storages power plant employ design scheme of one water conveyance system with several units, especially one water conveyance system with two units. Therefore, phenomenon of hydraulic disturbance often occurs. In this paper, focusing on two units in one conveyance system of Xianju pump-storage station, i.e. Unit 1 and Unit 2, disturbed powerhouse vibration was investigated for the other unit 100% load rejected. Time-domain and frequency domain characteristics were obtained by techniques of time-domain and frequency-domain analysis. The research indicates that for the disturbed powerhouse section, the permutation entropy of vibration signals have the same trend of active power, the disturbed powerhouse section is much more affected by disturbed unit (Unit 1) than the load rejection unit (Unit 2), the maximum root-mean-square value of vibrations in the powerhouse section of the disturbed unit occurs during the active power regulation of unit 1, and the vibration signals contain rich rotor-stator interference frequency components caused by load rejection unit. The observation results provide a useful basis for the optimization analysis of powerhouse structure in the subsequent construction of pumped-storage power station.