Dynamic analysis of multi-unit hydropower systems in transient process

Li, Huanhuan; Chen, Diyi; Xu, Beibei; Tolo, Silvia; Patelli, Edoardo

doi:10.1007/s11071-017-3679-7

Cited by 13 publications

(8 citation statements)

References 34 publications

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“…The main function of a pressure pipeline is to introduce water flow into the turbine, but water hammer will be induced during the transient process, which will affect the dynamic quality of HTGUs. Moreover, the governing equations of unsteady flow can be described by continuous equation and momentum equation [10][11][12]…”

Section: Pressure Pipelinementioning

confidence: 99%

“…Since the hydropower system is a complex non‐linear system, a coupling model can be established to study the hydro‐electrical connection. Therefore, Li et al [10] addressed a hydraulic–mechanical–electrical model to study the transient process of the multi‐turbine hydropower system. Zhang et al [11] set up a fine model to simulate the hydro‐electrical connection.…”

Section: Introductionmentioning

confidence: 99%

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Research on hydraulic–electric interference and optimisation of multi‐turbine hydropower system based on the dual control mode

Duan¹,

Zhang

Zhang³

et al. 2019

IET Renewable Power Generation

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Aiming at the complex hydraulic and electrical interference, as well as the stability of the hydropower plant that one diversion tunnel supplies water to multiple turbines, a high-order coupling model based on the dual control mode of the speed and excitation regulation is developed. Some scenarios, involving the hydraulic interference law, the effect of partial load rejection on the stability and dynamic characteristics of the units, and the optimisation of the power system stabiliser (PSS), are investigated. It is found that the change of the guide vane opening (or power) of one of the units causes the water hammer in its spiral case and penstock, and the water level fluctuation in the surge chamber. Besides, hydraulic disturbances suffered by other units are mainly caused by water level fluctuation in the surge chamber, rather than directly from the water hammer. The results demonstrate that the unit wiring of the generator and transformer is better than the expansion unit wiring in terms of the dynamic characteristics. In addition, PSS not only can suppress low-frequency oscillations, but also affect the hydraulic transition process, and the improved PSS2B-proportional-integral-derivative can increase the positive damping, and more effective in suppressing system oscillations.

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Section: Pressure Pipelinementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on hydraulic–electric interference and optimisation of multi‐turbine hydropower system based on the dual control mode

Duan¹,

Zhang

Zhang³

et al. 2019

IET Renewable Power Generation

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“…As we have known, switching rules play an important role in improving the stability and robustness of the image noise preprocessing of interactive projection system. The arbitrary switching is random and cannot guarantee that each frame of the image is switched to the suitable adaptive filtering algorithm [22][23][24][25]. Therefore, the switching algorithm with arbitrary switching rule needs to be improved in terms of accuracy and the switching rules can be optimized in the next step.…”

Section: Remarkmentioning

confidence: 99%

“…Therefore, the switching algorithm with arbitrary switching rule needs to be improved in terms of accuracy and the switching rules can be optimized in the next step. In future work, the average dwell time 7 Complexity switching method or the event-driven switching method will be considered to improve the filtering accuracy and the robustness for the image processing filter system [24][25][26][27][28][29][30][31].…”

Section: Remarkmentioning

confidence: 99%

Image Noise Preprocessing of Interactive Projection System Based on Switching Filtering Scheme

2018

Complexity

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The interactive projection systems based on deep images are usually disturbed by the mixed noise. Generally, several filtering methods are used in combination to resolve this problem. Although the hybrid filter can guarantee the accuracy of the image, but the algorithm is complex and time-consuming, which affects the real-time performance of the interactive projection system. In this paper, the switching system method is introduced into the filter for the first time, and an arbitrary switching filter algorithm is proposed and applied to the depth image filtering system based on Kinect sensor. The experimental results demonstrate and validate that the proposed switching filter algorithm not only effectively removes the noise but also ensures the real-time performance of tracking and achieves good target tracking performance, which makes it applicable in various image filtering processing systems.

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“…We have three innovations to make our paper attractive compared with the existing papers such as [27,28]. First, few existing literatures have been proved successfully in applying the dynamic safety assessment to HGSs, especially in large fluctuation transient processes.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Safety Assessment in Nonlinear Hydropower Generation Systems

Yang

Xia

2018

Complexity

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This paper focuses on the stability problems in a hydropower station. To enable this study, we consider a nonlinear hydropower generation system for the load rejection transient process based on an existing hydropower station. Herein we identify four critical variables of the generation system. Then, we carry out the dynamic safety assessment based on the Fisher discriminant method. The dynamic safety level of the system is determined, and the evolution behavior in the transient process is also performed. The result demonstrates that the hydropower generation system in this study case can operate safely, which is in a good agreement with the corresponding theory and actual engineering. Thus, the framework of dynamic safety assessment aiming at transient processes will not only provide the guidance for safe operation, but also supply the design standard for hydropower stations.

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Dynamic analysis of multi-unit hydropower systems in transient process

Cited by 13 publications

References 34 publications

Research on hydraulic–electric interference and optimisation of multi‐turbine hydropower system based on the dual control mode

Research on hydraulic–electric interference and optimisation of multi‐turbine hydropower system based on the dual control mode

Image Noise Preprocessing of Interactive Projection System Based on Switching Filtering Scheme

Dynamic Safety Assessment in Nonlinear Hydropower Generation Systems

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