电站含不同装机容量机组导叶关闭规律  

Closing rules of turbines guide vane in hydropower plants with different installed capacity

作　　者：王沁怡 刘熠 黄卫 张健[1] 陈楠 陈胜[1] WANG Qinyi;LIU Yi;HUANG Wei;ZHANG Jian;CHEN Nan;CHEN Sheng(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing,Jiangsu 210098,China;Sinohydro Bureau 12 Co.,Ltd.,Hangzhou,Zhejiang 310030,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]中国水利水电第十二工程局有限公司,浙江杭州310030

出　　处：《排灌机械工程学报》2024年第5期491-496,540,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51879087,52179062);中央高校基本科研业务费专项(B210202015)。

摘　　要：扩建小容量生态机组是保证已建电站下游所需生态用水的有效方式之一.对于需要扩建机组的水电站,增设机组和原设机组选取的导叶关闭规律是否协调对于调节保证参数有着重要意义.基于特征线法建立了过渡过程仿真模型,探究设有不同装机容量机组水电站的导叶关闭规律组合,开展了新增生态小机组前后对电站调保参数影响的对比分析,并揭示了电站中机组装机容量对蜗壳压力的影响机理.结果表明:电站中原机组若沿用增设生态机组前的关闭规律,会导致蜗壳压力超出控制标准,因此应适当延长导叶关闭时间;机组装机容量越大,机组转速越小,蜗壳压力越大;电站设置不同装机容量(AABB)机组时,装机容量较小的机组A可直接采用电站全为该容量的方案(AAAA)的关闭规律,装机容量较大的机组B可参考电站全用较大装机方案(BBBB)的关闭规律.研究成果可为同类型水电站的导叶关闭规律选取提供参考.One of the most efficient ways to ensure the ecological water required downstream of hydropower plants is the expansion of modest capacity eco-turbines.For the purpose of regulating and ensuring parameters in hydropower plants that require the expansion of turbines,the coordinated guide vane closing law for capacity enhancement and original turbine selection is crucial.A transition process numerical simulation model was created based on the characteristics line method to investigate the combination of the best guide vane closing laws for hydropower plants with various installed capacities of turbines.A comparative analysis was conducted on the impact of adding new ecological small units on the maintenance parameters of the power plant,and the mechanism of the influence of the capacity of the assembled units in the power plant on the volute pressure was revealed.The results indicate that the volute pressure will exceed the control requirement if the plant′s original turbine adheres to the closing rule before adding eco-turbines,therefore,the guide vane closing time should be prolonged correspondingly.The larger the installed capacity of the unit,the lower the unit speed,and the greater the volute pressure.When different installed capacity(AABB)turbines are installed in a hydropower plant,turbine A with the smaller installed capacity can adopt the guide vane closing law of the scheme(AAAA)in which the hydropower plant is equipped with the full capacity turbine,and turbine B with the larger installed capacity can refer to the guide vane closing law of the scheme(BBBB)in which the hydropower plant is equipped with the full capacity turbine.The research results can provide refe-rence for the selection of guide vane closing law of the same type hydropower stations.

关 键 词：导叶关闭规律 过渡过程 装机容量 调保参数 生态机组 

分 类 号：S277.9[农业科学—农业水土工程]