Stability and dynamic characteristics of the nonlinear coupling system of hydropower station and power grid

Lai, Xinjie; Li, Chaoshun; Guo, Wencheng; Xu, Yanhe; Li, Yonggang

doi:10.1016/j.cnsns.2019.104919

Cited by 47 publications

(20 citation statements)

References 27 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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“…where T w is the inertia time constant of the pressure water diversion system. By substituting (15) into (11), the transfer function of the hydro-turbine can be rewritten as…”

Section: Of 14mentioning

confidence: 99%

“…The stability analysis and reliable control of an HGS have become a hot topic for hydraulic mechanical systems [9][10][11][12][13]. In practical application, due to non-linear vibration of hydroelectric generating units, external disturbances and the aging of generating equipment, stability problems of hydropower stations are common [14,15]. Therefore, it is very meaningful to design a controller for the stable operation of an HGS.…”

Section: Introductionmentioning

confidence: 99%

Design of a Finite-Time Terminal Sliding Mode Controller for a Nonlinear Hydro-Turbine Governing System

2020

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We focus on the finite-time control of a hydro-turbine governing system (HGS) in this paper. First, the nonlinear mathematical model of the hydro-turbine governing system is presented and is consistent with the actual project. Then, based on the finite-time stability theory and terminal sliding mode scheme, a new finite-time terminal sliding mode controller is designed for the hydro-turbine governing system and a detailed mathematical derivation is given. Only three vector controllers are required, which is less than the HGS equation dimensions and is easy to implement accordingly. Furthermore, numerical simulations for the proposed scheme and an existing sliding mode control are presented to verify the validity and advantage of improving transient performance. The approach proposed in this paper is simple and provides a reference for relevant hydropower systems.

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“…Due to the complex flow patterns in an SCTT, the transient process of HTGSes with SCTTs is much more complicated than that of an HTGS with a pressurized tailrace tunnel. The control of transient processes relates to the regulation quality [57][58][59]. The regulation quality of HTGSes is the basis for the power supply quality of hydropower plants [60][61][62].…”

Section: Transient Process Control Of Htgses With Scttsmentioning

confidence: 99%

A Review of the Hydraulic Transient and Dynamic Behavior of Hydropower Plants with Sloping Ceiling Tailrace Tunnels

Guo

2019

Energies

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The sloping ceiling tailrace tunnel is a novel tailrace tunnel system for hydropower plants. The design, operation, and maintenance of hydropower plants with sloping ceiling tailrace tunnels are based on the calculation and analysis of hydraulic transients and dynamic behavior. Research achievements have provided guidance and a basis for the safe, stable, and efficient operation of hydropower plants with sloping ceiling tailrace tunnels. Based on research achievements, sloping ceiling tailrace tunnels have been applied to more and more hydropower plants. This review paper gives a systematic literature investigation on the hydraulic transient and dynamic behaviors of hydropower plants with sloping ceiling tailrace tunnels. First, the appearance and development of sloping ceiling tailrace tunnels are stated. Key issues in the hydraulic transient and dynamic behaviors of hydropower plants with sloping ceiling tailrace tunnels are illuminated. Then, research achievements on six issues (i.e., the working principles of sloping ceiling tailrace tunnels, the shape design of sloping ceiling tailrace tunnels, the free surface pressurized flow characteristics in sloping ceiling tailrace tunnels, numerical simulations of transient processes for hydro-turbine governing systems with sloping ceiling tailrace tunnels, the stability of hydro-turbine governing systems with sloping ceiling tailrace tunnels, and the transient process control of hydro-turbine governing systems with sloping ceiling tailrace tunnels) are elaborated. Finally, future research trends are presented. In future research, fluid–solid coupling of the tunnel wall and free surface pressurized flow in sloping ceiling tailrace tunnels is worth studying. For hydropower plants with sloping ceiling tailrace tunnels, a combined operating scheme with thermal power and wind power should be explored.

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Stability and dynamic characteristics of the nonlinear coupling system of hydropower station and power grid

Cited by 47 publications

References 27 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

Design of a Finite-Time Terminal Sliding Mode Controller for a Nonlinear Hydro-Turbine Governing System

A Review of the Hydraulic Transient and Dynamic Behavior of Hydropower Plants with Sloping Ceiling Tailrace Tunnels

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