Stability analysis of hydro-turbine governing system including surge tanks under interconnected operation during small load disturbance

Abstract The operating modes of hydro-turbines have a significant influence on the stability of hydropower plants. In this study, a linking method of multiple hydropower plants and the frequency equation of the interconnected system are proposed. The state space modeling of the hydro-turbine governing system (HTGS), including the pipe system and surge tanks, is established under interconnected operating modes. The proposed model is used to simulate the small fluctuation process under isolated and interconnected operations based on the parameters of two simulated hydropower plants. The stability of the systems under different operating conditions is compared, and the effect of surge tank area on the stable region is analyzed. The results indicate greater stability under interconnected operating conditions because of the change in regulating modes of the turbines. A hydropower plant with a smaller proportion of the total output has an insignificant effect on the system when the interconnected system is properly stable. In addition, the difference in the surge tank periods should be maintained outside the adverse range.

[1]  Nand Kishor,et al.  Dynamic simulations of hydro turbine and its state estimation based LQ control , 2006 .

[2]  H. Shayeghi,et al.  Load frequency control strategies: A state-of-the-art survey for the researcher , 2009 .

[3]  Yanbin Yuan,et al.  Application of multi-objective controller to optimal tuning of PID gains for a hydraulic turbine regulating system using adaptive grid particle swam optimization. , 2015, ISA transactions.

[4]  Hanif M. Chaudhry,et al.  Applied Hydraulic Transients , 1979 .

[5]  Bhupendra K. Gandhi,et al.  Effect of transients on Francis turbine runner life: a review , 2013 .

[6]  Diyi Chen,et al.  Nonlinear dynamical analysis of hydro-turbine governing system with a surge tank , 2013 .

[7]  Yanhe Xu,et al.  A nonlinear generalized predictive control for pumped storage unit , 2017 .

[8]  Jianxu Zhou,et al.  New Elastic Model of Pipe Flow for Stability Analysis of the Governor-Turbine-Hydraulic System , 2011 .

[9]  Diyi Chen,et al.  Modeling and stability analysis of a fractional-order Francis hydro-turbine governing system , 2015 .

[10]  XiaoDong YuX. Yu,et al.  Critical superposition instant of surge waves in surge tank with long headrace tunnel , 2011 .

[11]  R. P. Saini,et al.  A review on hydropower plant models and control , 2007 .

[12]  Guillermo Martínez-Lucas,et al.  Power-frequency control of hydropower plants with long penstocks in isolated systems with wind generation , 2015 .

[13]  Jiandong Yang,et al.  Eigen-analysis of hydraulic-mechanical-electrical coupling mechanism for small signal stability of hydropower plant , 2018 .

[14]  Chen Sheng,et al.  Stability analysis of governor-turbine-hydraulic system by state space method and graph theory , 2016 .

[15]  Wei Zeng,et al.  Instability analysis of pumped-storage stations under no-load conditions using a parameter-varying model , 2016 .

[16]  K. Natarajan,et al.  Robust PID controller design for hydroturbines , 2005, IEEE Transactions on Energy Conversion.

[17]  D. H. Thorne,et al.  Field Testing and Simulation of Hydraulic Turbine Governor Performance , 1974 .

[18]  Guillermo Martínez-Lucas,et al.  Frequency control support of a wind-solar isolated system by a hydropower plant with long tail-race tunnel , 2016 .

[19]  Xinxin Li,et al.  Large amplitude water level oscillations in throttled surge tanks , 1989 .

[20]  E. Benjamin Wylie,et al.  Fluid Transients in Systems , 1993 .

[21]  Mingjiang Wang,et al.  Nonlinear modeling and stability analysis of hydro-turbine governing system with sloping ceiling tailrace tunnel under load disturbance , 2015 .

[22]  C. Kung,et al.  Stability of air-cushion surge tanks with throttling , 1992 .

[23]  Beibei Xu,et al.  Hamiltonian modeling of multi-hydro-turbine governing systems with sharing common penstock and dynamic analyses under shock load , 2016 .

[24]  J. D. McCalley,et al.  Analysis of Very Low Frequency Oscillations in Hydro-Dominant Power Systems Using Multi-Unit Modeling , 2012, IEEE Transactions on Power Systems.

[25]  Long Chen,et al.  Basic Modeling and Simulation Tool for Analysis of Hydraulic Transients in Hydroelectric Power Plants , 2008, IEEE Transactions on Energy Conversion.

[26]  Wang Chao,et al.  Linear Modeling and Regulation Quality Analysis for Hydro-Turbine Governing System with an Open Tailrace Channel , 2015 .

[27]  Jiandong Yang,et al.  Regulation quality for frequency response of turbine regulating system of isolated hydroelectric power plant with surge tank , 2015 .

[28]  Xiaodong Yu,et al.  Innovative Closure Law for Pump-Turbines and Field Test Verification , 2015 .

[29]  Jiandong Yang,et al.  Wear and tear on hydro power turbines – Influence from primary frequency control , 2016 .

[30]  Mohamed Salah Ghidaoui,et al.  A Review of Water Hammer Theory and Practice , 2005 .