Stability analysis of governor-turbine-hydraulic system by state space method and graph theory

Yu, Xiaodong; Zhang, Jian; Fan, Chengyu; Chen, Sheng

doi:10.1016/j.energy.2016.07.164

Cited by 80 publications

(30 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Modeling accuracy relates to any length of the First oscillation modes between hydraulic model [11][12][13] penstock. system and mechanic system are ignored Second order elastic model [14] Second oscillation modes of hydro-mechanic-electric factors are reflected.…”

Section: Modeling Inaccuracy When Length Of Penstock L> 200 M First Omentioning

confidence: 99%

Mathematical model and parametric uncertainty analysis of a hydraulic generating system

Chen

Patelli

et al. 2019

Renewable Energy

View full text Add to dashboard Cite

Conversion efficiency and unit vibration are two important indexes in evaluating the stability of hydraulic generating systems (HGSs). Most of related studies have been carried out in the deterministic theory framework. As running times of HGS increased, understanding uncertainties and limitations of model parameters are important for accurate modeling and stability evaluation. In this study, first, we establish an integrated model of a HGS by proposing unbalanced hydraulic forces based on the Kutta-Zhoukowski assumption. Second, global sensitivity and parametric interactions for conversion efficiency and unit vibration are investigated based on this model. Finally, the novel unified model is verified with two conventional models. This integrated and accurate mathematical model is a major advance in the diagnosis and prediction of failures in hydropower operation. *Revised Manuscript-Clear Click here to download Revised Manuscript-Clear: 20180520-a clear manuscript.docx Click here to view linked References

show abstract

Section: Modeling Inaccuracy When Length Of Penstock L> 200 M First Omentioning

confidence: 99%

Mathematical model and parametric uncertainty analysis of a hydraulic generating system

Chen

Patelli

et al. 2019

Renewable Energy

View full text Add to dashboard Cite

show abstract

“…It is particularly important for such giant hydro-turbine units to ensure their safe and stable operation [4][5][6]. However, there are varying degrees of stability problems in large and medium-sized hydroelectric generator units in production practice both at home and abroad [7][8][9][10]. The stability of the hydro-generator sets plays an important role in the stability of the power grid system.…”

Section: Introductionmentioning

confidence: 99%

Design of a Nonlinear Predictive Controller for a Fractional-Order Hydraulic Turbine Governing System with Mechanical Time Delay

et al. 2019

View full text Add to dashboard Cite

A nonlinear predictive control method for a fractional-order hydraulic turbine governing system (HTGS) with a time delay is studied in this paper. First, a fractional-order model of a time-delay hydraulic turbine governing system is presented. Second, the fractional-order hydraulic servo subsystem is transformed into a standard controlled autoregressive moving average (CARMA) model according to the Grünwald-Letnikov (G-L) definition of fractional calculus. Third, based on the delayed Takagi-Sugeno fuzzy model, the fuzzy prediction model of the integer-order part of the HTGS is given. Then, by introducing a fourth-order Runge-Kutta algorithm, the fuzzy prediction model can be easily transformed into the CARMA model. Furthermore, a nonlinear predictive controller is proposed to stabilize the time-delay HTGS. Finally, the experiment results are consistent with the theoretical analysis.

show abstract

“…To ensure a stable and fast response performance of the clutch actuator system, an optimal design method for the pressure control valve considering the stability was proposed in [5]. The state space model of the governor-turbine-hydraulic system, which consists of a mechanical subsystem, a hydraulic subsystem and an electronic subsystem, was established and used to analyze the stability of the whole system by solving the coefficient matrix of the state equations in [6]. In [7], a proportional pressure control valve was modeled using bond graphs and investigated the relative contribution of key factors in the valve by simulations.…”

Section: Introductionmentioning

confidence: 99%

Modeling and dynamic analysis of a pilot-operated pressure-regulating solenoid valve used in automatic transmission with bond graphs

Fan

Mei

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

The pilot-operated pressure-regulating solenoid valve (PPRSV) is a key component of the automatic transmission (AT) in automobiles, and its performance significantly affects the efficiency and service lift of the AT and even road safety. However, few studies are devoted to the mathematical model of the PPRSV, and there is especially a lack of test equipment to verify its pressure control performance. Thus, the goal of this study is to find an effective and convenient modeling method and to verify the correctness of the model through simulations and experimentation. The bond graphs method, which is widely utilized to study hydraulic dynamics because it can easily identify the parameter process and consider the interactions in a hydraulic system, is selected here to help develop the numerical model of the PPRSV. The effective bulk modulus of hydraulic fluid was dynamically analyzed by considering the effect of the temperature, pressure and entrapped air. To consider the time delays of the electrical actuation and spool motion, the time delay element and Kirchhoff's and Ohm's laws are emphatically discussed to show the nonlinearity of forces. In addition, the Dahl model was used to more clearly express the static friction force to examine the hysteresis of the valve pressure. The comparative simulated and experimental studies confirm that the developed model can be used to study the control performance of the PPRSV, and the modeling method developed in this paper is feasible and handy.

show abstract

Stability analysis of governor-turbine-hydraulic system by state space method and graph theory

Cited by 80 publications

References 22 publications

Mathematical model and parametric uncertainty analysis of a hydraulic generating system

Mathematical model and parametric uncertainty analysis of a hydraulic generating system

Design of a Nonlinear Predictive Controller for a Fractional-Order Hydraulic Turbine Governing System with Mechanical Time Delay

Modeling and dynamic analysis of a pilot-operated pressure-regulating solenoid valve used in automatic transmission with bond graphs

Contact Info

Product

Resources

About