摘要
云南电网异步联网试验后出现了周期较长的频率振荡现象,使得孤岛系统的稳定性大幅降低。基于单机系统分析了调速系统的阻尼特性,即水电机组的水锤效应变大,系统阻尼随之减小。在4机系统中通过灵敏度分析描述了各模型参数对超低频模式的参与程度,对调速器PI参数进行了仿真分析。最后在实际电网中比较了水电厂和火电厂在频率振荡中的作用效果,仿真试验说明了退出主力电厂的一次调频可提高系统频率稳定性。
After the asynchronous interconnection test of the Yunnan Power Grid,a long-period frequency oscillation phenomenon appeared,which greatly reduced the stability of the island system.Based on the single-machine system,the damping characteristics of the speed control system were analyzed,that is,the water hammer effect of the hydropower unit become larger,and the system damping decreased.In the 4-machine system,the degree of participation of each model parameter in the ultra-low frequency mode was described through sensitivity analysis,and the governor PI parameters were simulated and analyzed.Finally,the effects of hydropower plants and thermal power plants in frequency oscillation were compared in the actual power grid.The simulation test showed that the primary frequency regulation withdrawing from the main power plant could improve the system frequency stability.
作者
魏蒙希
邓伟
王旭
WEI Mengxi;DENG Wei;WANG Xu(Chengdu College of University of Electronic Science and Technology of China,Chengdu 100080,China;China Chengda Engineering Co.,Ltd.,Chengdu 610041,China)
出处
《电工技术》
2020年第21期1-4,共4页
Electric Engineering
基金
四川省教育厅自然科学项目(编号14ZB0385)。
关键词
水锤效应
阻尼特性
灵敏度分析
调速系统
water hammer effect
damping characteristics
sensitivity analysis
speed control system
