Coordinated regulation of ball valves in pumped storage power stations for extreme conditions

HUANG Wei; YANG Kailin; GUO Xinlei; MA Jiming; LI Jiazhen

doi:10.16511/j.cnki.qhdxxb.2019.22.013

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Journal of Tsinghua University(Science and Technology) ›› 2019, Vol. 59 ›› Issue (8) : 635-644. DOI: 10.16511/j.cnki.qhdxxb.2019.22.013

HYDRAULIC ENGINEERING

Coordinated regulation of ball valves in pumped storage power stations for extreme conditions

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Abstract

For some pumped storage power stations, the maximum pressures at the spiral case inlet and the draft tube inlet cannot be limited to their allowable ranges by simply optimizing the guide vane closing law for extreme conditions. This paper presents a control strategy using coordinated regulation of the intake ball valve and the guide vane for such cases. A one-dimensional simulation is used to analyze the influence of the guide vane closing law, pump-turbine characteristics and ball valve closing law on the pump-turbine rotational speed and the pressures at the spiral case inlet and the draft tube inlet. A case study shows that this cooperative control mode has little effect on the first stage of the speed and the pressures at the ball valve inlet and the draft tube inlet, but significantly reduces the secondary peaks in the speed and ball valve inlet pressure and improves the second minimum draft tube inlet pressure. Moreover, this control mode also effectively prevents the units from entering the "S" shaped unstable area for small guide vane openings, so the system reduces the water hammer and pressure pulsations in pumped storage power stations.

Key words

pumped storage power station / hydraulic transient / S-shaped characteristics / intake ball valve / guide vane

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HUANG Wei, YANG Kailin, GUO Xinlei, MA Jiming, LI Jiazhen. Coordinated regulation of ball valves in pumped storage power stations for extreme conditions[J]. Journal of Tsinghua University(Science and Technology). 2019, 59(8): 635-644 https://doi.org/10.16511/j.cnki.qhdxxb.2019.22.013

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