Transients In Hydroelectric Power Plants

Chaudhry, M. Hanif

doi:10.1007/978-1-4614-8538-4_5

Cited by 5 publications

(2 citation statements)

References 8 publications

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“…They are all complex nonlinear systems, and the study of their complex nonlinear dynamic behavior is of great significance for the realization of optimal economic operation control [6]. In previous works, the stability and dynamic characteristics of the HTGS were studied using the Routh-Hurwitz criterion [7], root locus method [8], state-space method [9], and Hopf bifurcation theory [10][11][12]. In [13], Hopf bifurcation theory is applied to analyze the influence of the structural parameters of the sloping ceiling tailrace tunnel on the stability domain of the PID control parameters.…”

Section: Symbolmentioning

confidence: 99%

Stability and Sensitivity Analysis and Optimization Control of the Hydro-turbine Generator Unit

Shi

Zhou

2021

Preprint

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The hydro-turbine governing system (HTGS) and shafting system are mutually coupled. However, the interaction between them has always been neglected. This paper aims to explore the stability and sensitivity of the governor control parameters to the HTGS and shafting system and make the optimal control of the stable operation for the hydro-turbine generator unit(HTGU). First, a novel HTGU motion equation is proposed, which can make connections between the HTGS and the shafting system of the HTGU. And on this basis, the nonlinear coupling mathematical model of the HTGS and the shafting system is established. According to the nonlinear mathematical model, the sensitivity of the governor control parameters on the operating stability of the HTGU is obtained. Then, a multi-objective governor control parameters optimization strategy is proposed. Furthermore, the chaotic-dominated sorting genetic algorithm II(NSGA-II) and multi-objective evolutionary algorithm based on decomposition(MOEAD) were introduced to obtain the optimal control parameter and mutually verify the effectiveness of the optimization effect. Finally, the nonlinear dynamic characteristics of HTGU under optimal control were revealed. The simulation results show that the rotation speed deviation and shafting system vibrations are sensitive on the PID parameters in some ranges and the stable region will be decreased when considering the shafting system vibrations. The multi-objective PID parameter optimization strategy shows good control performance on the nonlinear dynamic characteristics of the HTGU. The shafting system vibrations excited by the coupled vibration sources are quasi-period in 3D space. In addition to this, these results and the optimization strategy can provide some bases for the design and stable operation of the HTGU.

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Section: Symbolmentioning

confidence: 99%

Stability and Sensitivity Analysis and Optimization Control of the Hydro-turbine Generator Unit

Shi

Zhou

2021

Preprint

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“…The second type of method is based on the automatic control theory, adapted for studying the stability of HTRS in the small disturbance condition. The Rouse-Hurwitz criterion [9][10][11], the root trajectory method [12], the state space method [13,14], Hopf bifurcation theory [15,16] and Lyapunov theory [17,18] are typical methods. [19] used the global matrix method to analyze the stability of the HTRS system, which facilitates the flexible analysis of HTRS stability.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of hydropower unit operation conditions considering hydro-turbine nonlinearity

Lu,

2024

J. Phys.: Conf. Ser.

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This paper aims to study the law that the stability of hydropower systems changes with the system operating point and clarify the impact of hydro-turbine nonlinearity and hydraulic nonlinearity on the system stability. Firstly, the piecewise linearized model of the hydro-turbine regulation system (HTRS) at various operating points is established. Then, the HTRS stability domain is calculated and analyzed under various working heads and guide vane openings, and the impact of head variation on system stability is researched from the perspectives of discharge and power. Finally, the stability of various operating conditions under ideal hydro-turbine conditions and rated hydraulic parameter conditions are and compared to clarify the role of the water system and turbine nonlinearity on the stability. The results show that hydro-turbine nonlinearity helps to improve the system stability of the overall operating conditions, but the stability of the HTRS is relatively weak during high-load and low-head operations. Moreover, the hydro-turbine nonlinearity plays a dominant role in the process of stability changing with the operating head. This paper provides a comprehensive analysis of the system stability at different operating points, which can help guide the control optimization of hydropower systems.

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Stability and sensitivity analyses and multi-objective optimization control of the hydro-turbine generator unit

Shi¹,

Zhou²

2022

Nonlinear Dyn

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Transients In Hydroelectric Power Plants

Cited by 5 publications

References 8 publications

Stability and Sensitivity Analysis and Optimization Control of the Hydro-turbine Generator Unit

Stability and Sensitivity Analysis and Optimization Control of the Hydro-turbine Generator Unit

Stability analysis of hydropower unit operation conditions considering hydro-turbine nonlinearity

Stability and sensitivity analyses and multi-objective optimization control of the hydro-turbine generator unit

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