水力发电学报2024，Vol.43Issue(6)：113-122,10.DOI:10.11660/slfdxb.20240611
水泵水轮机S特性对相继甩尾水最小压力的影响
Influence of S characteristics of pump-turbine on minimum pressure in draft tube during successive load rejection
摘要
Abstract
To explore the relationship of the full S characteristic curve of a pump-turbine and the minimum pressure in its draft tube,we conduct numerical simulations of successive load rejection which is most unfavorable to the draft tube flow for the Xinfeng pumped storage power station.By adjusting the opening curve slope near the unit's operating trajectory,a comparative analysis and a summary are made on the influence of changes in the S zone shape on the extreme pressure in the draft tube under successive rejection conditions.We formulate a graphical indicator that is applicable in the early design phase of such stations to evaluate the impact of S-shape characteristics on draft tube pressure,and verify the calculation accuracy.The results show that for the first decrease of the unit's flow caused by the rejection,the operating trajectory presents a complete inverted S-shape.This shape change will cause a change in the slope of the unit's flow variations,and further result in a change in the extreme draft tube pressure that occurs near the S-shape inflection.The more the graphical indicator shape obtained approaches a vertically slender regular rectangular shape,the better the improvement of the corresponding minimum draft tube pressure.关键词
抽水蓄能电站/水泵水轮机全特性曲线/S特性/相继甩/尾水最小压力Key words
pumped storage power station/full characteristic curve of pump-turbine/S characteristics/successive load rejection/minimum pressure in draft tube分类
能源科技引用本文复制引用
王皓臻,俞晓东,林文雯,李朋宇,刘昌太..水泵水轮机S特性对相继甩尾水最小压力的影响[J].水力发电学报,2024,43(6):113-122,10.基金项目
国家自然科学基金(52179062) （52179062）
