| 刘熠,俞晓东,张健.设调压室水电站输水发电系统耦合振荡特性研究[J].水利学报,2023,54(6):739-748 |
| 设调压室水电站输水发电系统耦合振荡特性研究 |
| Research on coupling oscillation characteristics of the hydroelectric generating system of the hydropower station with surge tank |
| 投稿时间：2022-12-20 |
| DOI：10.13243/j.cnki.slxb.20221012 |
| 中文关键词: 水电站|过渡过程|调压室|耦合振荡|稳定性 |
| 英文关键词: hydropower station|transition process|surge tank|coupling oscillation|stability |
| 基金项目:国家自然科学基金项目(52179062，51839008) |
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| 中文摘要: |
| 设调压室水电站输水发电系统是复杂的水机电耦合系统，目前对耦合系统的振荡特性以及各个子系统间的耦合作用关系尚不明晰。本文首先将整个水电站系统分为 “引水隧洞-调压室”子系统和“压力管道-机组”子系统，针对“压力管道-机组”子系统的稳定性提出了耦合振荡域的概念并推导了其解析公式，然后结合特征值分析法和数值模拟揭示了耦合系统的振荡特性，最后运用频域分析法探究了两个子系统间的幅频特性及相互作用关系，提出了衡量系统耦合振荡稳定性的定量指标。结果表明：当调速器参数在耦合振荡域外取值时，水电站系统恒不稳定，因此调速器参数在耦合振荡域内取值是整个水电站系统稳定的必要条件。当调速器参数在耦合振荡域内取值时，耦合系统的稳定性由低频振荡模式决定，将系统低频振荡模式的频率代入到两个子系统的幅频特性函数之积中，可以得到振荡叠加率，该值反映了系统扰动在闭环系统中增益值，具有明确的物理意义，当振荡叠加率小于1时，受扰系统趋于稳定。研究成果不仅丰富了水力过渡过程理论体系，对提高水电站运行稳定性也具有较好的工程应用价值。 |
| 英文摘要: |
| The hydroelectric generating system of the hydropower station with surge tank is a complex hydro-mechanical-electric coupling system.However，the oscillation characteristics of the coupling system and the coupling relationship between the subsystems have not been clarified.In this paper，the whole hydropower station system is divided into the headrace tunnel-surge tank subsystem and the penstock-unit subsystem.Based on the stability of penstock-unit subsystem，the coupling oscillation domain is proposed，and its analytical formula is derived.Based on eigenvalue analysis and numerical simulation，the oscillation characteristics of the coupling system are studied.The amplitude-frequency characteristics and interaction between the two subsystems are investigated by frequency-domain analysis.The quantitative index for measuring the stability of the coupling system is proposed.The results show that when the governor parameters are set outside the coupling oscillation domain，the hydropower system is unstable.Therefore，the governor parameters set in the coupling oscillation domain is a necessary condition for the stability of the whole hydropower station system.The stability of the coupling system is determined by the low frequency oscillation mode when the governor parameters are set in the coupling oscillation domain.By substituting the frequency of the low frequency oscillation mode into the product of the amplitude-frequency characteristic functions of the two subsystems，the oscillation superposition rate can be obtained.The oscillation superposition rate reflects the gain value of the system disturbance in the closed-loop system，which has clear physical meaning.When the oscillation superposition rate is less than 1，the disturbed system tends to be stable.The research results not only enrich the theoretical system of hydraulic transition process，but also have good engineering application value for improving the operation stability of hydropower station. |
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