Excitation Current Analysis of a Hydropower Station Model Considering Complex Water Diversion Pipes

Yan, Donglin; Zhuang, Keyun; Xu, Beibei; Chen, Diyi; Mei, Renjie; Wu, Changzhi; Wang, Xiangyu

doi:10.1061/(asce)ey.1943-7897.0000446

Cited by 7 publications

(3 citation statements)

References 31 publications

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“…All welds of the switch pipe shall be 100% ultrasonic inspection, supplemented by 40% TOFD inspection and 100% magnetic particle inspection. Non-destructive testing should be carried out 48 hours after the welding is completed, and 100% colored penetration testing should be carried out after the hydraulic test [11].…”

Section: Welding Of Steel Bifurcationmentioning

confidence: 99%

Research on Construction Technology of Steel Bifurcation for Diversion System in Pumped Storage Power Station Under Complex Conditions

Ruoyu

2024

AJWSE

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Limited by weight and volume, the transportation and on-site installation of steel bifurcation in the diversion system of pumped storage power station have become a big problem in the construction of the project. According to the needs of the installation and construction of large 800 MPa steel bifurcation in the complex environment, combined with the characteristics of the transportation and installation in the tunnel, the unloading of steel bifurcation is carried out by using the bridge crane between the installation of underground powerhouse. The hoisting up-anchors and sliding trolley arranged in the tunnel are used to place and install the steel bifurcation, which solves the difficulty of hoisting and installing the large turnout pipe in the tunnel and has positive significance in saving the project cost and reducing the construction risk. In this paper, the construction technology of steel bifurcation is described under the complex conditions in pumped storage power station. Detailed description of steel bifurcation construction layout, assembly, site transportation and installation and other construction points, provide a feasible idea for the development of other similar projects.

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Section: Welding Of Steel Bifurcationmentioning

confidence: 99%

Research on Construction Technology of Steel Bifurcation for Diversion System in Pumped Storage Power Station Under Complex Conditions

Ruoyu

2024

AJWSE

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“…To clearly demonstrate the relationship between turbine speed and load, first order differential equation is adopted to model the generator and it follows [32]:…”

Section: Generator Modelmentioning

confidence: 99%

Feedback Linearization and Reaching Law Based Sliding Mode Control Design for Nonlinear Hydraulic Turbine Governing System

Guo

Jiang

2019

Energies

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Hydropower as renewable energy has continually expanded at a relatively high rate in the last decade. This expansion calls for more accurate scheme design in hydraulic turbine governing system (HTGS) to ensure its high efficiency. Sliding mode control (SMC) as a robust control method which is insensitive to system uncertainties and disturbances raises interest in the application in HTGS. However, the feature of highly coupled state variables reflects the nonlinear essence of HTGS and SMC studies on the related mathematical model under certain fluctuations are not satisfied. In this regard, a novel SMC design with proportional-integral-derivative manifold is firstly applied to a nonlinear HTGS with a complex conduit system. In dealing with certain fluctuations in speed and load around the rated working condition, the proposed SMC is capable of driving the system to the desired state with smooth and light responses in aspects of the key state variables. The exponential reaching law and introduced boundary layer fasten the speed of converging time and suppress chattering. A necessary integral of sliding parameter added to manifold successfully reduces the latency caused by the anti-regulation feature of HTGS. Three operating scenarios are simulated compared with the PSO-PID method, and results imply that the proposed SMC method equips with accurate trajectory tracking ability and smooth responses. Finally, the strong robustness against system uncertainties is tested.

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“…Lundström et al [21] analyzed the influence of the rotor and stator shape deviation on the dynamic characteristics of the generator, and proved the importance of the unbalanced magnetic pull nonlinear influence; Calleecharan et al [22] proposed a rotor model considering radial and tangential unbalanced magnetic pull forces; Xu et al [23] studied the effect of UMP on radial vibration of hydroelectric generators, and compared and analyzed the simulation results and the field experimental data; Zeng et al [24] established the hydro turbine generating sets dynamics model by using the unbalanced magnetic pull force acting on the generator and the unbalanced force acting on the rotor as the input excitation of the hydro turbine generating sets system; Xu et al [25] established a hydro-generator dynamics model considering the nonlinear unbalanced magnetic pull force and the linear water unbalance force; Xu et al [26] studied the response characteristics of unbalanced magnetic pull rotor system considering both static and dynamic eccentricity. Xiang et al [27] analyzed the influence of unbalanced magnetic pull on the nonlinear dynamic characteristics of permanent magnet synchronous motors rotor system; Li et al [28] established a two-dimensional hydroelectric generator electromagnetic model, using the finite element method to study the characteristics of the electromagnetic flux and electromagnetic force; Yan et al [29] analyzed the influence of excitation current on the nonlinear dynamic behaviors of the generator. It should be noted that in all of the above research, most of them only consider one nonlinearity factor.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Nonlinear Dynamic Characteristics of a Mechanical-Electromagnetic Vibration System with Rubbing

Huang

et al. 2019

Applied Sciences

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In this study, a rotor-bearing-runner system (RBRS) considering multiple nonlinear factors is established, and the complex nonlinear dynamic behavior of the coupling system is studied. The effects of excitation current, radial stiffness, and friction coefficient on dynamic characteristics are analyzed by numerical simulation. The research results show that the dynamic properties of the coupling system caused by different nonlinear factors are interactional. With the changes of different parameters, the RBRS presents multiple motion states, including periodic-n, quasi-periodic, and chaotic motion. The increase of the excitation current Ij has a certain inhibitory effect on the response amplitude of the system and makes the motion state of the system more complex, the chaotic motion wider, and the jump discontinuity enhanced. With the increase of radial stiffness kr, the motion complexity of the coupling system increases, the chaotic region increases, the response amplitude increases, and the vibration intensity increases. With the increase of the friction coefficient μ, the chaotic region increases first and decreases, the different motions alternate frequently, and the response amplitude gradually increases. This study can not only help to understand the dynamic characteristics of RBRS, but also help the stable operation of the generator set.

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Excitation Current Analysis of a Hydropower Station Model Considering Complex Water Diversion Pipes

Cited by 7 publications

References 31 publications

Research on Construction Technology of Steel Bifurcation for Diversion System in Pumped Storage Power Station Under Complex Conditions

Research on Construction Technology of Steel Bifurcation for Diversion System in Pumped Storage Power Station Under Complex Conditions

Feedback Linearization and Reaching Law Based Sliding Mode Control Design for Nonlinear Hydraulic Turbine Governing System

Analysis of Nonlinear Dynamic Characteristics of a Mechanical-Electromagnetic Vibration System with Rubbing

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