---Recently,
a MWR's key scientific and technical project called "Development
on Medium and Small-sized Water Pumped Storage Plant",
which was completed by National Research Institute for Rural
Electrification, has passed an appraisal organized by the
Department of International Cooperation, Science and Technology,
MWR. After hearing the achievement report presented by the
working group; and evaluating the research documentation
and information concerned, all the experts drew a conclusion
that this is the first scientific research project in China
specialized in the development of medium and small-sized
pumped storage plant with relatively systematic and comprehensive
illustrations. Its research components partially filled
in the gap for the development of medium and small-sized
pumped storage power plant in China and played a positive
role in promoting the further exploitation of this kind.
The general development and research achievement reached
the top level compared with other domestic research projects
of same kind then. Furthermore, the research on the semi-underground
powerhouse and the mathematic model of whole characteristic
curve for the reversible unit became internationally advanced.
With significant social and economic benefits, there's a
prosperous prospect for the application of this research
achievement.
Based on the construction of Xikou
Pumped Storage Power Plant, a great deal of research work
has been carried out with fruitful achievements scored.
The main innovative results are shown as below.
1. Xikou Pumped Storage Power Plant,
the first genuine medium-sized water pumped storage power
plant in China, was constructed and put into operation with
an appropriate site and layout. This plant is near a load
center, with a proportion of length to height between the
upper and the lower reservoir L/H= 4.7. Thanks to superior
resources conditions, at this plant the cost per kW is relative
low. Since operating, the plant has been running very well
with significant benefits, from which rich experience is
also accumulated for the construction and development of
the same kind of plant in China.
2. It was the first time for
a pumped storage power plant in China to adopt the shaft-type
powerhouse, which is accommodated to the topographic and
geological conditions. Compared with the underground powerhouse,
the layout turned out to be more reasonable, which helped
to improve operation conditions, facilitate construction
and save investment.
3. According to local situations,
also for the first time in China, the semi-voltage induction
starting mode was selected for the water pump, and the
solid magnetic pole used for the electromotor, which helped
the water pump to reduce its starting time and the time
for integrating into grid, and led to a lower cost of
equipment as well.
4. The unique means was adopted
for the mathematic mode of whole characteristic curve
for reversible units, which made the curve relatively
even and flat, so as to optimize the hydraulic design
for the water conveyance system.
5. The asymmetrical steel breeches
pipe made of conical tubes was adopted in reason. Moreover,
by the means of model test and numeric simulation, the
fork angle of the breeches pipe and the cone angle of
the conical tubes were determined, as to improve the hydraulic
operating conditions.
6. Based on the topographic situation,
it was the first time in China to adopt the rockfill dam
with concrete facing and ogee dam axis, which increased
the reservoir capacity and reduces the excavation amount
for the lower reservoir basin. With fruitful practices,
it sets a good example for other similar projects (2004-03-29)
