Special Issue "Pumped-Storage Hydropower Plants"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy".

Deadline for manuscript submissions: 15 July 2019

Special Issue Editor

Guest Editor
Prof. Giovanna Cavazzini

Department of Industrial Engineering, University of Padova, Padua, Italy
Website | E-Mail
Interests: advanced design and optimization procedures applied to fluid machines; analysis of hydraulic machines unsteady phenomena; optimal sizing and management of energy and hybrid energy storage systems

Special Issue Information

Dear Colleagues,

Looking at future grids with increasing shares of intermittent renewable energy solutions, pumped hydro energy storage (PHES) plants are widely recognized as an ideal solution because of their ability to provide large storage capacity with excellent grid connection properties, high cycle efficiency range, and competitive costs. However, in order to provide primary and secondary regulation services, there is a primary need to increase the PHES operational flexibility by developing new machine designs and/or new technologies, as well as by providing hybridization with different types of energy and energy storage systems. To stimulate research areas in these fields, it is important to gather the most relevant ongoing research works on new solutions for PHES (innovative design, innovative control systems, etc.) and on their hybridization with other energy and energy storage systems (sizing algorithm, forecast model, management strategies, virtual power plant, etc.). Therefore, you are kindly invited to share your recent findings in this Special Issue.

Prof. Giovanna Cavazzini
Guest Editor

Manuscript Submission Information

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Published Papers (1 paper)

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Research

Open AccessArticle Internal Mechanism and Improvement Criteria for the Runaway Oscillation Stability of a Pump-Turbine
Appl. Sci. 2018, 8(11), 2193; https://doi.org/10.3390/app8112193
Received: 3 October 2018 / Revised: 31 October 2018 / Accepted: 5 November 2018 / Published: 8 November 2018
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Abstract
The runaway oscillation process of the pump-turbine in a high head pumped-storage power plant is usually unstable. The root cause of its instability is still unclear. In this paper, its internal mechanism and the improvement method were studied in depth. First, the flow [...] Read more.
The runaway oscillation process of the pump-turbine in a high head pumped-storage power plant is usually unstable. The root cause of its instability is still unclear. In this paper, its internal mechanism and the improvement method were studied in depth. First, the flow characteristics in a model pump-turbine during the runaway process at four guide-vane openings (GVOs) were investigated by 3D transient numerical simulations. Then, the energy dissipation characteristics of different types of backflow vortex structures (BFVSs) occurring at the runner inlet and their impacts on the runaway stability were investigated by the entropy production theory. The results show that the location change of BFVSs between the hub side and the mid-span of the runner inlet around the no-load point leads to the sharp change in the energy dissipation rate, which makes the slope of dynamic trajectory positive and the runaway oscillation self-excited. If the occurrence of BFVSs at the hub side is suspended, the runaway process will be damped. Finally, the pump-turbine runner was improved to obtain a wider stable operating range. Full article
(This article belongs to the Special Issue Pumped-Storage Hydropower Plants)
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