导叶波动对抽蓄机组低水头空载稳定影响分析  

Influence Analysis of Guide Vane Fluctuation Rate on Pump Storage Units Under No-load Condition of Low Head

作　　者：郭俊勋 周大庆[1] 陈会向[1] 王胤淞 GUO Junxun;ZHOU Daqing;CHEN Huixiang;WANG Yinsong(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 211100,Jiangsu Province,China)

机构地区：[1]河海大学水利水电学院,江苏省南京市211100

出　　处：《中国电机工程学报》2022年第15期5587-5594,共8页Proceedings of the CSEE

基　　金：国家自然科学基金(51979086,51839008,52006053);江苏省自然科学基金(BK20200508)。

摘　　要：抽蓄电站低水头工况下空载不稳定是影响机组并网成功率的重要因素,针对水泵水轮机空载状态下导叶波动速率对机组空载稳定性的影响进行探究。建立白莲河电站全流道系统三维数值仿真模型,采用动网格技术联合用户自定义函数(user-defined functions,UDF)编程算法实现空载导叶波动及不同波动速度的对比计算模拟。计算结果表明,降低导叶的波动速度可以有效地降低转轮力矩的波动以及降低流体的压力脉动,其中导叶波动速度的降低对活动导叶间流态的改善效果最为明显,可以消除一些附加的频率脉动,该附加脉动是促进功率失衡的原因之一,在导叶波动速度超过0.0044rad/s时产生,并且只存在于水流未到达转轮区的区域;因此调速器在空载工况运行时,在总调节时间不超过需求时间的前提下,应尽可能使导叶波动速度降低,从而增强机组运行稳定性。To improve the no-load instability of power stations under the low head,the influence of guide vane fluctuation rate on no-load stability was explored in this paper.Fluent software was used to carry out three-dimensional numerical simulation of the full channel system of the Bailianhe Hydropower Station,and the dynamic grid technology combined with the UDF programming algorithm was used to realize the simulation of no-load guide vane fluctuation and comparative calculation in different fluctuation rates.Calculation results show that reducing the fluctuation rate of guide vane can effectively cut down the fluctuation of runner torque and the pressure pulsation of fluid.The decrease of guide vane fluctuation rate has the most obvious effect on improving the flow pattern between the movable guide vane and it can also eliminate some additional interference pulse frequency.The additional pulsation is one of the reasons of power imbalance,and it occurs when the guide vane fluctuation rate exceeds 0.0044rad/s.It only exists in the area where the water flow does not reach the runner area.Therefore,when the governor is running under no-load conditions,within the time required,the guide vane fluctuation speed should be reduced as far as possible to enhance the operation stability of the unit.

关 键 词：抽蓄机组 导叶波动 空载稳定性 用户自定义函数 三维数值模拟 

分 类 号：TM61[电气工程—电力系统及自动化]