含上、下游双调压室的抽水蓄能电站小波动涌浪特性研究  

Study on Surge Wave Characteristics of Pumped Storage Power Station with Upstream and Downstream Double Surge Chambers Under Small Fluctuations

作　　者：龚涛 张健[1] 王开朗 GONG Tao;ZHANG Jian;WANG Kai-lang(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《水电能源科学》2023年第7期118-122,共5页Water Resources and Power

基　　金：国家重点研发计划(2016YFC0401810);江苏省第五期“333工程”培养资金项目(BRA2018061)。

摘　　要：为研究含上、下游双调压室的抽水蓄能电站小波动涌浪特性,基于状态空间法推导了该布置类型的抽水蓄能电站小波动数学模型,通过数值模拟求解上、下游调压室涌浪时域过程,采用快速傅里叶变换(FFT)得到了上、下游调压室涌浪频域过程,在不考虑调速系统和调压室系统发生水力耦合的情况下,建立压力管道流量与调压室水位之间的传递函数,进而得到了调压室系统幅频特性。结果表明,上、下游调压室涌浪幅值最大时对应的输入信号频率与调压室系统固有频率相近,调压室涌浪振荡频率对应机组转速尾波振荡频率;调压室涌浪特性与调压室面积和输水隧洞水头损失系数密切相关,增大两调压室面积可降低上、下游调压室涌浪的频率和幅值,系统稳定性增强;输水隧洞水头损失系数变化对上、下游调压室涌浪振荡频率无影响,对上、下游调压室涌浪幅值影响较大,且水头损失系数越大涌浪幅值越小,系统稳定性越好。In order to study the surge wave characteristics of pumped storage power station with upstream and downstream surge chambers under small fluctuations,the mathematical model of small fluctuations in a pumped storage power station with this type of arrangement was derived based on the state-space method.The time-domain process of surge wave in the upstream and downstream surge chambers was solved by numerical simulation.The frequency-domain process of surge wave in the upstream and downstream surge chambers was obtained by the fast Fourier transform(FFT).Without considering the hydraulic coupling between the speed regulating system and the surge chamber system,the transfer function between the pressure pipeline flow and the water level of the surge chamber was established to obtain the amplitude-frequency characteristics of the surge chamber systems.The results show that the input signal frequency corresponding to the maximum amplitude of the surge wave in the upstream and downstream surge chambers is similar to the natural frequency of the surge chamber system,and the surge wave oscillation frequency in the surge chamber corresponds to the tail wave oscillation frequency of the unit speed.The surge wave characteristics of the surge chamber are closely related to the area of the surge chamber and the head loss coefficient of the water delivery tunnel.Increasing the area of two surge chambers can reduce the frequency and amplitude of surge wave in the upstream and downstream surge chambers,and enhance the stability of the system.The variation of head loss coefficient of the tunnel has no impact on the oscillation frequency of surge wave in the upstream and downstream surge chambers,but has a great impact on surge wave amplitude in the upstream and downstream surge chambers.The larger the head loss coefficient is,the smaller surge amplitude is,the system stability is better.

关 键 词：抽水蓄能电站 上、下游双调压室 小波动 涌浪特性 系统稳定性 

分 类 号：TV732.5[水利工程—水利水电工程]