Power Stabilization System with Counter-Rotating Type Pump-Turbine Unit for Renewable Energy

Toru Miyaji^1*, Risa Kasahara¹, Toshiaki Kanemoto², Jin-Hyuk Kim³, Young-Seok Choi³, Toshihiko Umekage²

¹Graduate School of Engineering, Kyushu Institute of Technology, Fukuoka, Japan.
²Faculty of Engineering, Kyushu Institute of Technology, Fukuoka, Japan.
³Green Energy System Technology Center, Korea Institute of Industrial Technology, Cheonan, Korea.

DOI: 10.4236/jpee.2014.24007                

Abstract

Traditional type pumped storage system contributes to adjust the electric power unbalance between day and night, in general. The pump-turbine unit is prepared for the power stabilization system, in this serial research, to provide the constant power with good quality for the grid system, even at the suddenly fluctuating/turbulent output from renewable energies. In the unit, the angular momentum changes through the front impeller/runner must be the same as that through the rear impeller/runner, that is, the axial flow at the outlet should be the same to the axial flow at the inlet. Such flow conditions are advantageous to work at not only the pumping mode but also the turbine mode. This work discusses experimentally the performance of the unit, and verifies that this type unit is very effective to both operating modes.

Keywords

Power Stabilization; Pump-Turbine; Counter-Rotation; Impeller; Generator Motor

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Kanemoto, T., Kimura, S., Ohba, S. and Satoh, M. (2000) Smart Control of Axial Flow Pump Performances by Means of Counter-Rotating Type (1st Report, Counter-Rotating Type and Performances). JSME, Series B, 66, 2927-2933. (in Japanese) http://dx.doi.org/10.1299/kikaib.66.651_2927
[2]	Kanemoto, T., Tanaka, D., Kashiwabara, T., Uno, M. and Nemoto, M. (2001) Tidal Current Power Generation System Suitable for Boarding on a Floating Buoy. International Journal of Offshore and Polar Engineering, 11, 77-79.
[3]	Nunoya, T., Takata, C., Makita, K. and Kanemoto, T. (2011) Field Test of the Intteligent Wind Power Unit. 2011 COWEOE Conference Proceeding (International Conference on Offshore Wind Energy and Ocean Energy.
[4]	Oba, S. and Kanemoto, T. (2004) Performance Comparison by Design Change of Counter-Rotating Impeller. 22th IAHR Symposium on Hydraulic Machinery and Systems, Stockholm.
[5]	Suzuki, T., Takano, G., Nakamura, Y. and Kanemoto, T. (2011) Counter-Rotating Type Hydroelectric Unit (Effects of Blade Numbers on On-Cam Operations). ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, Hamamatsu.