基于模态级数法的复杂水电系统二阶振荡模式-OpenRepositoryof.PDFVIP

40 卷 9 期 电 网 技 术 Vol. 40 No. 9 20 16 年9 月 Power System Technology Sep. 20 16 文章编号：1000-3673 （20 16）09-2714-07 中图分类号：TM 72 1 文献标志码：A 学科代码：470 40 基于模态级数法的复杂水电系统二阶振荡模式 高慧敏，章坚民，吴晨曦 （杭州电子科技大学 自动化学院，浙江省 杭州市 310018 ） Second Oscillation Mode Study of Complex Hydropower System Based on Modal Series Method GAO Huimin, ZHANG Jianmin, WU Chenxi (College of Automation, Hangzhou Dianzi University, Hangzhou 310018, Zheji ang Province, China) ABSTRACT: Aiming at unexplained oscillation mechanism of [1] 站与电网之间很多情况下属于弱互联电网 。在强 hydropower stations, nonlinear oscillation mechanism of 电网联系下，水电站的动态属于慢速动态行为，对 complex hydropower stations is studied based on modal series 系统的动态振荡影响不大，对系统中长期稳定有较 analysis method. Firstly, detail hydropower station model with 大影响。但在弱电网条件下，即使在小扰动下，系 hydro-mechanical-electrical coupling and linear elastic model 统也会表现出强非线性特性，振荡模式的非线性相 is determined. Secondly, nonlinear oscillation modes and [2] associated factors of hydropower stations are proposed based 互作用成为影响系统动态稳定性的重要因素 ；某 on modal series method. And then second oscillation modes 些水电系统的动态振荡无法用常规的负阻尼理论 and nonlinear factors of some hydropower station with 和线性理论来解释，需要考虑复杂水力系统的非线 complex conduits are calculated with modal series method and [3] 性特性对系统动态振荡的影响 。 linear elastic model. Digital simulation shows that there is no 以往研究电力系统动态振荡水电站模型多采 new dominant second order oscillation mode, and nonlinearity