Operation of the counter-rotating type pump-turbine unit installed in the power stabilizing system

Kanemoto, Toshiaki; Honda, Hidemasa; Kasahara, Risa; Miyaji, Toru

doi:10.1088/1755-1315/22/1/012032

IOP Conf. Ser.: Earth Environ. Sci.

2014

DOI: 10.1088/1755-1315/22/1/012032

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Operation of the counter-rotating type pump-turbine unit installed in the power stabilizing system

Toshiaki Kanemoto¹,

Hidemasa Honda²,

Risa Kasahara³

et al.

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2024

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Cited by 2 publications

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Optimization of pumped hydro energy storage design and operation for offshore low-head application and grid stabilization

Prasasti,

Aouad,

Joseph

et al. 2024

Renewable and Sustainable Energy Reviews

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Optimization of pumped hydro energy storage design and operation for offshore low-head application and grid stabilization

Prasasti,

Aouad,

Joseph

et al. 2024

Renewable and Sustainable Energy Reviews

View full text Add to dashboard Cite

Analysis of mode-switching of a contra-rotating pump-turbine based on load gradient limiting shutdown and startup sequences

Fahlbeck,

Nilsson,

Salehi

2024

IOP Conf. Ser.: Earth Environ. Sci.

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The contra-rotating pump-turbine (CRPT) is investigated as a runner configuration enabling more efficient low-head pumped hydro storage (PHS). To enhance the flexibility of low-head PHS with a CRPT, it is important to examine mode-switching. This study examines two mode-switching sequences for the CRPT, one turbine-to-pump and one pump-to-turbine. The mode-switching sequences are made as a combination of shutdown and startup sequences of each mode. The goal is to avoid pump and turbine brake modes while maintaining smooth load gradients. The turbine shutdown of the turbine-to-pump mode-switching involves a multi-stage valve closure to reduce the rotational speed of the runners, followed by the pump startup based on a previously optimised sequence. The pump shutdown of the pump-to-turbine mode-switching involves a gradual valve closure and rapid speed down of the runners at the end of the sequence. This is followed by the turbine startup, where a valve opens to generate sufficient flow over the runners before increasing the rotational speed of the runners simultaneously. Both mode-switching sequences require approximately 5 s each, and the largest loads are experienced during the pump mode parts of the sequences. The analysis is carried out using transient computational fluid dynamics with the OpenFOAM open-source software.

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Operation of the counter-rotating type pump-turbine unit installed in the power stabilizing system

Cited by 2 publications

References 5 publications

Optimization of pumped hydro energy storage design and operation for offshore low-head application and grid stabilization

Optimization of pumped hydro energy storage design and operation for offshore low-head application and grid stabilization

Analysis of mode-switching of a contra-rotating pump-turbine based on load gradient limiting shutdown and startup sequences

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