Abstract
This paper analyses the economic viability of pumped-storage hydropower plants equipped with ternary units and considering hydraulic short-circuit operation. The analysed plant is assumed to participate in the day-ahead energy market and in the secondary regulation service of the Spanish power system. A deterministic day-ahead energy and reserve scheduling model is used to estimate the maximum theoretical income of the plant assuming perfect information of the next day prices and the residual demand curves of the secondary regulation reserve market. Results show that the pay-back periods with and without the hydraulic short-circuit operation are significantly lower than their expected lifetime and that the pay-back periods can be reduced with the inclusion of the hydraulic short-circuit operation.
Highlights
Pumped-storage hydropower plants (PSHPs) are considered worldwide as a mature technology to store large quantities of energy and to improve the flexibility of the power systems [1]
The main goal and contribution of this paper is to evaluate the economic viability of closed-loop and daily-cycle PSHPs equipped with ternary units and considering hydraulic short-circuit operation
The economic viability of a closed-loop and daily-cycle PSHP equipped with ternary units with and without considering the operation in hydraulic short-circuit mode has been preliminarily evaluated in this paper
Summary
Pumped-storage hydropower plants (PSHPs) are considered worldwide as a mature technology to store large quantities of energy and to improve the flexibility of the power systems [1]. Several papers have been found in the technical literature analysing the economic viability of conventional PSHPs participating in the day-ahead energy market. Published under licence by IOP Publishing Ltd knowledge, there is no published paper in which the economic viability of PSHPs equipped with ternary units and considering the hydraulic short-circuit operation (HSC-PSHPs) is analysed [5]. The main goal and contribution of this paper is to evaluate the economic viability of closed-loop and daily-cycle PSHPs equipped with ternary units and considering hydraulic short-circuit operation. We use the term MTI to refer to the income that the PSHP would obtained assuming perfect information of the day hourly energy prices, the residual demand curves of the reserve market, the amount of the committed reserves effectively used in real-time and the regulation energy prices. As the maximum variation of the water level in the upper reservoir can be negligible in comparison with the available gross head, the head dependency in the mathematical formulation is neglected
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