摘要
对于水电机组含明渠尾水系统,目前尚无有效的明渠频域模型,不利于开展系统频域稳定性分析。基于总体矩阵,推导了明渠频域模型,对某单管单机布置的水电机组含明渠系统开展了小波动稳定性分析。结果表明:不设尾水调压室时,明渠越长越不利于系统稳定,随着明渠长度从100m增加至500m,稳定域面积减少0.466;反之,设置尾水调压室时随着明渠长度的增加,系统稳定域呈现先减小后增大的变化趋势,这与系统自振频率有关。无论是否设置尾水调压室,明渠初始水深增加均有利于系统的稳定,但对系统稳定域影响较小:随着初始水深从12 m增加至18 m,稳定域面积增加0.130,设调压室时,稳定域面积仅增加0.258。
For hydropower units with open channel tailrace systems,there is currently no effective frequency-domain model for open channels,which hinders the ability to conduct frequency-domain stability analyses.In this study,a frequency-domain model for open channels is derived based on the global matrix method,and small-disturbance stability analysis is carried out for a hydropower unit with a single-penstock,single-turbine configuration including an open channel.The results indicate that,in the absence of a tailrace surge chamber,an increase in open channel length negatively affects system stability.The area of the stability region decreases by 0.466 as the open channel length increases from 100 m to 500 m.Conversely,when a tailrace surge chamber is present,the stability region of the system initially decreases and then increases with the extension of the open channel,which is closely related to the system's natural frequency.Regardless of whether a tailrace surge chamber is used,an increase in the initial water depth of the open channel generally enhances system stability,although its impact on the stability region remains limited.The area of the stability region increases by 0.130 as the initial depth of the open channel increasing from 12 m to 18 m,whereas with the surge chamber installed,the area only increases by 0.258.
作者
刘道桦
刘跃
唐碧华
赵桂连
王超
张显龙
马伟超
赵志高
LIU Dao-hua;LIU Yue;TANG Bi-hua;ZHAO Gui-lian;WANG Chao;ZHANG Xian-long;MA Wei-chao;ZHAO Zhi-gao(Power China Chengdu Engineering Corporation Limited,Chengdu 610072,Sichuan Province,China;Power China Kunming Engineering Corporation Limited,Kunming 650501,Yunan Province,China;School of Water Resources and Hydropower Engineering,Wuhan University,Wuhan 430074,Hubei Province,China)
出处
《中国农村水利水电》
北大核心
2026年第3期223-227,233,共6页
China Rural Water and Hydropower
基金
科技人才与平台计划:(202305AK34003)
武汉市知识创新专项项目(2023020201020276)
湖北省自然科学基金面上项目(2024AFB748)。
关键词
水电机组
明渠尾水系统
频域建模
稳定性分析
Hydropower unit
open channel tailrace systems
frequency-domain modeling
stability analysis
