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

Shi, Yousong; Zhou, Jing

doi:10.1007/s11071-021-07009-7

Cited by 15 publications

(2 citation statements)

References 40 publications

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“…Steven W. Shaw et al proposed a hybrid averaging method and harmonic balance method to determine the steady-state response of nonlinear hydraulic systems, including stability information [14] . Yousong Shi et al used the Hopf bifurcation theory to test the stability of the nonlinear hydraulic system [15] . Based on the nonlinear mathematical model, the stability and sensitivity of the governor control parameters were obtained.…”

Section: Introductionmentioning

confidence: 99%

Characteristic Analysis Method for Integrated Multi-Parameter Hydro-viscous Speed Control System

Wang

Zhao

et al. 2023

Preprint

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Hydro-viscous clutch has become an inevitable choice for the transmission of contemporary and future special vehicles. As a nonlinear dynamic system with large lagging link, its timing performance is affected by input rotational speed, lubricating oil temperature, lubricating pressure and other factors. However, in the actual application process, the actual influence of the influencing factors on the system performance is often judged by engineering experiences. From the control point of view, the speed regulation law and formation mechanism of hydro-viscous speed control system(HSCS) are not clear, and the control characteristics and global model are indeterminate. To solve the above problems, this paper analyzes the speed control characteristics of HSCS, including steady-state speed control characteristics and dynamic speed control characteristics. The specific characteristic parameters are obtained, and the data-driven model describing the input rotational speed, output speed, control oil pressure and lubricating oil temperature is established. The formation mechanism of the multi-region in HSCS is analyzed. According to the analysis, this paper determines that the effective pressure control range of HSCS is 0-6.2 Bar, the effective force control range is 0–4 KN, the fastest response time is greater than 3s. This paper provides the basis for integrated modeling and control method design. It is helpful to further reveal and obtain the control characteristics and parameters of HSCS, so as to provide the basis for the structure and parameter optimization, performance evaluation and analysis of HSCS machinery and hydraulic system.

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Section: Introductionmentioning

confidence: 99%

Characteristic Analysis Method for Integrated Multi-Parameter Hydro-viscous Speed Control System

Wang

Zhao

et al. 2023

Preprint

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“…The hydropower unit is necessary equipment for hydroelectric system, and its fast and effective control is related to the safety and stability of power plant operation [1][2][3]. Still, it will be affected by various factors during the control process [4,5].…”

Section: Introductionmentioning

confidence: 99%

Design and dynamic control of integrated synergetic controller for single penstock two-machine hydropower system

Wang

Zeng

Qian

2022

Preprint

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Due to the existence of hydraulic coupling in the single penstock multi-machine system, the stability time of the unit is prolonged when power disturbance occurs, which is not conducive to the stability of the power system. Based on the synergy theory, this paper builds a nonlinear model of a hydro generator unit with the single penstock two-machine system, adds the synergy factors of the governing system and the excitation system, describes the characteristics of the controlled system, and derives the control law. A simulation system is built to verify the effectiveness of the proposed method. Load disturbance and three-phase short-circuit fault are set up to compare the dynamic response effects of the PID controller with optimized parameters and the synergetic controller. The results show that the proposed control method has a better control effect in the single penstock two-machine system and can better reduce the influence of the common pipe due to hydraulic coupling, shorten the stabilization time, and ensure the stability of the system. In addition, the values of regulation and synergetic control parameters are analyzed separately to provide a reference for achieving better control.

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Analysis of liquid spring damper for vertical landing reusable launch vehicle with network-based methodology

Yue

Titurus²,

Li³

et al. 2022

Nonlinear Dyn

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This paper presents the network-based modeling, validation and analysis of the nonlinear liquid spring damper model under vertical landing conditions of reusable launch vehicle. The impedance function of damper model is derived first. Then, its mechanical and hydraulic networks are newly established based on the hydro-mechanical analogy and network-based analysis. By comparing the networks between the corresponding symmetric and asymmetric structures, the meaning of each branch in the network is elucidated. After that, the validity of the network-based model for the liquid spring damper is confirmed by comparison against the experimentally verified nonlinear model in both frequency and time domain. The force and energy absorption characteristics of the damper model are further decomposed, and, specifically, the influence of the orifice area and orifice length on the attenuation performance is studied. The results show that the network-based model provides predictions consistent with those generated by the nonlinear model. The main discrepancy is attributed to the inaccuracy caused by the equivalent fluid bulk modulus. The network-based analysis indicates that the orifice area mainly influences the damping force in the network, which further affects the loads and efficiency of the damper. The orifice length mainly influences the inertia force in the network, which should be limited to a small value. The proposed novel interpretation of the damper models and responses under impact conditions constitutes a framework suitable for systematic design of typically highly nonlinear landing systems in reusable launch vehicles.

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

Cited by 15 publications

References 40 publications

Characteristic Analysis Method for Integrated Multi-Parameter Hydro-viscous Speed Control System

Characteristic Analysis Method for Integrated Multi-Parameter Hydro-viscous Speed Control System

Design and dynamic control of integrated synergetic controller for single penstock two-machine hydropower system

Analysis of liquid spring damper for vertical landing reusable launch vehicle with network-based methodology

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