Dynamic response and governor tuning of a long penstock pumped-storage hydropower plant equipped with a pump-turbine and a doubly fed induction generator

•The dynamic response of a long penstock variable-speed pumped-hydro plant is analyzed.•Two different governor tuning criteria are proposed.•The tuning criteria consider the elastic water column effects in the penstock.•The tuning criteria are applied to a pumped-hydro plant in the pre-planning stag...

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Bibliographic Details
Published in:Energy conversion and management 2015-12, Vol.106, p.151-164
Main Authors: Sarasúa, José Ignacio, Pérez-Díaz, Juan Ignacio, Wilhelmi, José Román, Sánchez-Fernández, José Ángel
Format: Article
Language:English
Subjects:
Hydro power generation
Load–frequency control
Power system simulation
Pumped storage
Variable speed
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Summary:•The dynamic response of a long penstock variable-speed pumped-hydro plant is analyzed.•Two different governor tuning criteria are proposed.•The tuning criteria consider the elastic water column effects in the penstock.•The tuning criteria are applied to a pumped-hydro plant in the pre-planning stage.•The tuning criteria are compared to each other through performance indexes and simulations. In this paper, the dynamic response of a long penstock pumped-storage hydropower plant which is equipped with a single pump-turbine and a doubly-fed induction machine, is analyzed in detail in generating mode. The pumped-storage hydropower plant is connected to a small island power system with thermal generation, and provides load–frequency control under the orders of an automatic generation control system. The output power of the pumped-storage hydropower plant is assumed to be controlled by the rotor-side frequency converter. The unit running speed is controlled by an isochronous PI governor. The dynamic response of the pumped-storage hydropower plant is analyzed by using a linearized reduced order dynamic model, which considers the elastic water column effects in the penstock. Two governor tuning criteria are proposed in the paper: one is devised from the root locus analysis of the plant dynamic model, and the other one is based on a Pareto approach. The proposed tuning criteria are compared with each other and with a recently published tuning criterion through a set of commonly used performance indexes and by means of simulations with a nonlinear dynamic model.
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2015.09.030