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- Title
Transient dynamic analysis of a pump-turbine with hysteresis effect.
- Authors
Guo, Peng-Cheng; Zhang, Hao; Sun, Long-Gang
- Abstract
Hysteresis effect, which has a significant impact on transient characteristics of a pump-turbine, attracts more and more researchers' attention and shows great potential. Influences of hysteresis on dynamic characteristics of a pump-turbine are investigated during the transient process in this paper. Transient trajectories of pump-turbines actually do not match their static operation trajectories, especially in the condition of turbine braking. In order to establish a transient model of a pump-turbine in different moving directions of dynamic trajectories, time delays among the relative parameters are introduced in this paper. Furthermore, effects of hysteresis on the dynamic characteristics of the pump-turbine are analyzed in detail by using numerical simulation. Based on the established transient model, influences of unit head on the dynamic characteristics of the pump-turbine are studied during the bidirectional transient process. The simulation results show the transient characteristic of the pump-turbine can be improved with the enhancement of hysteresis effect. While it gradually loses stability with the increase of hysteresis. The conclusions provide us a new approach for regulating the transient performance and stability of pump-turbines by using hysteresis effect during transient process.
- Subjects
HYSTERESIS; TRANSIENT analysis; TURBINES; COMPUTER simulation; HYSTERESIS motors
- Publication
Modern Physics Letters B, 2020, Vol 34, Issue 12, pN.PAG
- ISSN
0217-9849
- Publication type
Article
- DOI
10.1142/S0217984920501250