Abstract
This paper studies the critical sectional area of surge tank (SAST) based on bifurcation and chaos behaviors of hydraulic-mechanical coupling hydropower station (HMCHS). Firstly, the model of HMCHS is established. Then, the criterion for the critical stable state (CSS) based on bifurcation behavior is derived. The critical SAST based on bifurcation behavior is determined and analyzed. Finally, the occurrence of chaos motion is identified. By analyzing the effect of SAST on chaos behavior, the critical SAST based on chaos behavior is determined. The results indicate that the critical SAST based on bifurcation behavior corresponds to CSS of HMCHS. Among nonlinearity of head loss of headrace tunnel, throttling orifice head loss of surge tank and nonlinearity of turbine characteristics, the influence degree of the nonlinearity of head loss of headrace tunnel is the greatest. Under the coupling effect of those three factors, the critical SAST based on bifurcation behavior becomes greater under load decrease and becomes less under load increase. For the chaos motion caused by low- and high-frequency oscillations together, there is the concept of critical SAST based on chaos behavior. With the decrease in proportional gain of governor, the critical SAST based on chaos behavior becomes less.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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This work was supported by the National Natural Science Foundation of China (Project No. 51909097).
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Appendices
Appendix A
List for abbreviations
SAST | Sectional area of surge tank |
HMCHS | Hydraulic-mechanical coupling hydropower station |
CSS | Critical stable state |
WLF | Water-level fluctuation |
PID | Proportional–integral–differential |
DRP | Dynamic response process |
LE | Lyapunov exponent |
Appendix B
The expressions for the coefficients \(a_{i} \left( {i = 1,2, \ldots ,6} \right)\) in Eq. (11) are presented as follows.
Appendix C
The expressions for the coefficients \(X_{j} \left( {j = 0,1, \ldots ,9} \right)\) in Eq. (14) are presented as follows.
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Guo, W., Xu, X. Critical sectional area of surge tank based on bifurcation and chaos behaviors of hydraulic-mechanical coupling hydropower station. Nonlinear Dyn 110, 1297–1322 (2022). https://doi.org/10.1007/s11071-022-07672-4
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DOI: https://doi.org/10.1007/s11071-022-07672-4