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Short-term hydro scheduling of a variable speed pumped storage hydropower plant considering head loss in a shared penstock

Short-term hydro scheduling of a variable speed pumped storage hydropower plant considering head loss in a shared penstock

Category
Journal publication
Abstract
In this paper we present in detail how to handle the nonlinear and state-dependent elements in the power consumption function (PCF) of a variable speed pump (VP). The function is formulated by piecewise linear approximations with dynamically specified breakpoints. In the proposed method, the head variation resulting from the change in the water level of the upstream and downstream reservoirs and head loss caused by the friction of water on the penstock wall are both considered. Furthermore, we put forward a heuristic to incorporate the head loss in a penstock shared by multiple VPs in a short-term hydro scheduling tool used for daily operation in the real world. The case study is taken from the Limmern pumped storage hydropower plant with 4×250 MW reversible Francis pump-turbines with variable speed technology. Each penstock is shared by two of the four units. The numerical results demonstrate that the appropriate formulation of the PCF and the accurate representation of the head loss in a shared penstock are crucial for obtaining realistic and optimal scheduling for VPs.
Language
English
Author(s)
Affiliation
  • SINTEF Energy Research / Energisystemer
  • Switzerland
Year
2019
Published in
IOP Conference Series: Earth and Environmental Science (EES)
ISSN
1755-1307
Volume
240