Stability analysis of nonlinear hydroelectric power generating system in the transition of sudden load decrease

Khov, Sengkong; Chen, Diyi; Kheav, Kimleng

doi:10.1080/02533839.2020.1751726

Cited by 8 publications

(3 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarity, the scholar about Orifice surge tank have been conducted by Guo and Zhu (2020) which also studied the setting condition of surge chamber at downstream using the nonlinear systems of HTG system and tailrace tunnel with sloping ceiling. In the case of transient load rejection, Khov et al (2020) studied the dynamic behaviors of the hydroelectric generating system and its stability under surge tank effects through a nonlinear mathematical model. Zhu and Guo (2019) considered nonlinear head loss of penstock to analyze effect of setting orifice surge tank for stability of hydro-turbine governing (HTG) system.…”

Section: Pairomentioning

confidence: 99%

Transient analysis to air chamber and orifice surge tanks in a hydroelectric generating system during the successive load rejection

Kheav

Duan

Egusquiza

et al. 2021

Energy Conversion and Management

Self Cite

View full text Add to dashboard Cite

Section: Pairomentioning

confidence: 99%

Transient analysis to air chamber and orifice surge tanks in a hydroelectric generating system during the successive load rejection

Kheav

Duan

Egusquiza

et al. 2021

Energy Conversion and Management

Self Cite

View full text Add to dashboard Cite

“…[1] As the core part of hydropower stations, the HTGS is a hydrodynamic, mechanical dynamic, and electrical dynamic system, [2,3] and its operation condition has a great influence on the stable operation of the power system. [4,5] Since China's hydropower companies developed their business toward the high-capacity and highhead direction, many problems such as unstable vibrations including self-excited oscillations caused by water, machinery, electrical, and other factors have frequently occurred. [6] In fact, the flexible operation of hydropower station (e.g., start-stop operations) as well as the adaptation to sharp load changes could lead these stations to act proactively for modulating the peak-frequency [7] in order to ensure safe and stable operation.…”

Section: Introductionmentioning

confidence: 99%

Existence of hidden attractors in nonlinear hydro-turbine governing systems and its stability analysis

Zhao

Wei

et al. 2023

Chinese Phys. B

View full text Add to dashboard Cite

This paper studies the stability and hidden dynamics of the nonlinear hydro-turbine governing system with an output limiting link. A new six-dimensional system, which exhibits some hidden attractors, is proposed in this work. The parameter switching algorithm is used to numerically study the dynamic behaviors of the system. Moreover,it is investigated that for some parameters the system with a stable equilibrium point can generate strange hidden attractors. A self-excited attractor is also recognized with the change of its parameters. In addition, numerical simulations are carried out to analyze the dynamic behaviors of the proposed system using the Lyapunov exponential spectrums, Lyapunov dimensions, bifurcation diagrams, phase space orbits, and basins of attraction. Consequently, the findings of this work show that the basins of hidden attractors are tiny for which the standard computational procedure for localization is unavailable. These simulation results help to have better understanding of hidden chaotic attractors in higher-dimensional dynamical systems.It is also of great significance to reveal chaotic oscillations such as uncontrolled speed adjustment in the operation of hydropower station due to small changes in initial values.

show abstract

“…Moreover, the research on the dynamics of hydroelectric generation system has attracted a lot of attentions. Some useful achievements have been made in the aspects of new approaches for system fault identification, 13 optimal maintenance scheme for the system, 14 dynamic response analysis of the nonlinear system under adverse conditions 15,16 and system dynamic stability evaluation. 16 However, the influence of flood discharge from dam body on the dynamic characteristics of hydropower units is not involved in the relevant researches.…”

Section: Introductionmentioning

confidence: 99%

An SVDD-based post-processing approach for vibration risk assessment of the hydro-turbine-generator in a large hydropower station

Zhang

Yang

Liang

et al. 2020

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

Due to the frequently occurred adverse vibration of hydraulic structures, vibration risk assessment is significant for the water energy efficiency of hydropower station and the safety of people and structures. Recently, the abnormal vibration of hydro-turbine-generator in a large hydropower station occurred and the main influencing factors of vibration are analyzed based on the prototype data and engineering experience. Different from the deterministic variable features in traditional support vector domain description (SVDD) algorithms, the feature of vibration amplitude is actually a random variable so that the different target objects will be obtained at different confidence levels. In order to assess the vibration range and excessive vibration probability, the original SVDD boundary at relatively low confidence level is firstly calculated. Then, the boundary extension operation with detailed theoretical deduction is performed and the extended boundary is further optimized inspired by path planning problem. The advantage of proposed approach is that it can improve the data fitting performance for single dimension (i.e. vibration amplitude) without leading to complex boundary which cannot be used for vibration risk assessment. By applying this approach to the practical vibration problem, the quantitative and slightly conservative assessment results are conveniently obtained, which indicate that this approach is reasonable and cost-effective.

show abstract

Stability analysis of nonlinear hydroelectric power generating system in the transition of sudden load decrease

Cited by 8 publications

References 46 publications

Transient analysis to air chamber and orifice surge tanks in a hydroelectric generating system during the successive load rejection

Transient analysis to air chamber and orifice surge tanks in a hydroelectric generating system during the successive load rejection

Existence of hidden attractors in nonlinear hydro-turbine governing systems and its stability analysis

An SVDD-based post-processing approach for vibration risk assessment of the hydro-turbine-generator in a large hydropower station

Contact Info

Product

Resources

About