混流式水轮机尾水锥管压力脉动的排列熵分析  

Permutation Entropy Analysis for Draft-tube Pressure Pulsation of Francis Turbines

作　　者：付婧[1] 徐静[2] 张飞 潘虹[4] FU Jing;XU Jing;ZHANG Fei;PAN Hong(Information Center,China Institute of Water Resources and Hydropower Engineering,Beijing 100044,China;Division of Research,Management and Planning,China Institute of Water Resources and Hydropower Engineering,Beijing 100038,China;Technology Center,State Grid Xinyuan Co.,Ltd.,Beijing 100161,China;College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]中国水利水电科学研究院信息中心,北京100044 [2]中国水利水电科学研究院科研计划处,北京100038 [3]国网新源控股有限公司技术中心,北京100761 [4]河海大学能源与电气学院,南京211100

出　　处：《噪声与振动控制》2021年第3期82-87,共6页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(51809082);国网公司科技资助项目(52573020000B);中国水科院基本科研业务费资助项目(HM0145B242020)。

摘　　要：尾水管压力脉动是混流式水轮发电机组水力激振的主要来源。针对某电站700 MW级水电机组升水位期间全水头下尾水锥管压力脉动实测信号,引入排列熵进行分析,以参考工况为例对影响排列熵计算的嵌入维数和延迟时间进行优化,结果表明:采用嵌入维数6、延迟时间3对尾水锥管压力脉动信号进行排列熵分析可以有效获得信号特征复杂性描述。在此基础上,对上库水位160.0 m、下库水位65.8 m时的尾水锥管压力脉动信号进行分析,得出结论为:排列熵与压力脉动峰峰值呈强负相关,采用排列熵可以反映机组实际运行状态。对全水头下尾水锥管压力脉动信号的排列熵进行计算,获得该点表征的机组运行特征。Draft tube pressure pulsation is one of key sources that induce hydropower unit vibration.In this paper,permutation entropy was introduced for pressure pulsation signal analysis.The pressure pulsation in the draft conical tube of a 700MW hydropower unit was measured during the upstream water level increasing period.With the reference working condition of the draft tube as an example,the embedded dimension and delay time,which influence the permutation entropy analysis,were optimized.The optimization result shows that for embedded dimension m=6 and delay time τ=3,the signal complexity description can be obtained effectively based on the permutation entropy analysis.Then,permutation entropy and peak-to-peak value of the pressure pulsation of the draft conical tube at upper reservoir water level of 160.0 m and low reservoir water level of 65.8 m were calculated.The calculation results indicate that the permutation entropy and the peak-topeak value have a strong negative correlation,which shows that the permutation entropy can reflect the unit operation conditions.Furthermore,the permutation entropy of the pressure pulsation of the draft conical tube at full water head was calculated,and the unit operation characteristics represented by the measurement points were obtained.

关 键 词：振动与波 尾水锥管 压力脉动 排列熵 峰峰值 

分 类 号：TV733[水利工程—水利水电工程] TN911.7[电子电信—通信与信息系统]