Study on stability margin of ultra-low frequency oscillation in hydropower system

被引：2
|
作者：
Tang, Fan [1 ]
Zhang, Yudong [1 ]
Liang, Xiaobin [1 ]
Gong, Zhengyu [1 ]
Li, Xin [1 ]
Liu, Jiayu [1 ]
Ru, Hang [2 ]
Sun, Jian [2 ]
Li, Hongxun [2 ]
机构：
[1] Southwest Branch State Grid Corp China, 299 Shuxiu West Rd, Chengdu 610000, Peoples R China
[2] Southwest Jiaotong Univ, Sch Elect Engn, 999 Xian Rd, Xian, Peoples R China
来源：
ENERGY REPORTS | 2023年 / 9卷
关键词：
Hydropower units; Ultra-low frequency oscillation; Oscillation mode; Security domain; Stability margin;
D O I：
10.1016/j.egyr.2023.04.255
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
In recent years, the ultra-low frequency oscillation of power system caused by hydropower units has occurred frequently. It is very important to study the ultra-low frequency oscillation characteristics of hydropower stations for the stable operation of power system. It is worth further research on how to determine the system stability margin in engineering practice. Based on the established model of single machine system with load, the analysis of the characteristic equation of closed-loop transfer function of single machine system shows that the ultra-low frequency oscillation will occur when the ratio of proportional parameter to integral parameter is too small. Based on the single machine with load system model and the equivalent single machine with load model of multi machine system, the ultra-low frequency oscillation mode of the system is analyzed by eigenvalue analysis method. According to the requirements of the damping ratio index, the security domain of the system ultra-low frequency oscillation is constructed, and the risk and stability margin of the system ultra-low frequency oscillation are evaluated by the characteristic values of the system ultra-low frequency oscillation mode. (c) 2023 The Authors. Published by Elsevier Ltd.
引用
收藏
页码：41 / 48
页数：8
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