Abstract
Installation of upstream and downstream surge chamber is a significant and feasible measure for peak pressure control in the hydropower system with long water diversion and drainage tunnel. This paper presents a study on the fluctuation stability with such a measure. For this system, a complete mathematical model including diversion pipeline, upstream surge tank, hydraulic turbine and downstream surge tank was developed, calculating the hydraulic transition characteristics and analyzing the fluctuation stability with different surge tank cross areas. The calculation shows that, the hydropower system with upstream and downstream surge chamber, can also be stable even if the surge tank cross area is smaller than the calculated value. In practice, in the condition of meeting the stability requirement, multiple schemes should be calculated in order to find out the minimum areas to reduce project investment.
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