摘要
随着风能、太阳能等可再生间歇性能源在电网中的比例逐渐增加,电力系统需要更加灵活的调节手段,而水电机组深度调峰是建设新型电力系统的关键技术之一。为探究水电机组深度调峰过程中影响系统稳定性和振荡阻尼特性的关键因素,采用Hopf分岔理论方法,建立了功率控制模式下的一管双机布置设下游调压室的水电站数学模型,分析了水电机组调峰工况和系统参数对系统功率的影响,然后引入稳定余量的概念,以机组转速频率和阻尼比为衡量指标,探究了系统在同衰减度下不同工况点的低频振荡阻尼特性。研究结果表明:在不同调峰工况下,稳态负荷越小,系统稳定域越大;通过合理设置系统参数可以有效抑制系统功率波动;在同衰减度下,转速阻尼比较大的工况点可以抑制系统低频振荡。研究成果可为新型电力系统下水电站稳定运行提供一定方法借鉴和技术参考。
With the gradual increase in the proportion of wind,solar and other intermittent energy sources in the power grid,the power system needs more flexible means of regulation,so the deep peaking regulation capacity of hydropower units is one of the key technologies to build a new power system.In order to explore the key factors affecting the system stability and oscillation damping characteristics during the deep peaking regulation of hydropower units,the method of Hopf bifurcation theory was employed in this study.Then the mathematical model of hydroelectric power plant of two units sharing one pipeline set up,with downstream surge tank under the power control mode was constructed,the influence of peaking conditions and system parameters on the power of the system was also analyzed.Finally,the concept of stability margin was introduced to explore the damping characteristics of low-frequency oscillations of the system at different operating points under the same attenuation degree,using the unit speed frequency and damping ratio as the measures.The results show that the smaller the steady state load under different peaking conditions,the larger the stability domain.The power fluctuation of the system can be effectively suppressed by reasonably setting the parameters.And the low-frequency oscillation of the system can be suppressed for the operating point with larger rotational speed damping ratio under the same degree of attenuation.The results of the study can provide certain methodological references and technical references for the stable operation of hydropower plants in the context of new power systems.
作者
李初辉
姚登峰
黄天雄
蒋志强
许颜贺
LI Chuhui;YAO Dengfeng;HUANG Tianxiong;JIANG Zhiqiang;XU Yanhe(China Yangtze Power Co.,Ltd.,Yichang 443002,China;Hubei Key Laboratory of Digital River Basin Science and Technology,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《人民长江》
北大核心
2025年第8期216-223,共8页
Yangtze River
基金
三峡金沙江云川水电开发有限公司禄劝乌东德电厂项目(Z522302034)
国家自然科学基金项目(52179016,52039004)。
关键词
稳定域
功率调节
低频振荡
深度调峰
稳定余量
水力发电
stability domain
power regulation
low frequency oscillation
deep peaking regulation
stability margin
hydropower
