Mechanism Analysis of Ultra-low Frequency Oscillation and Parameter Optimization of Hydro Turbine Governor

被引：0
|
作者：
Su Y. [1 ]
Liu T. [1 ]
Li B. [1 ]
Jiang Q. [1 ]
Han X. [2 ]
Chen G. [1 ]
机构：
[1] College of Electrical Engineering, Sichuan University, Chengdu, 610065, Sichuan
[2] State Grid Sichuan Electric Power Company, Chengdu, 610041, Sichuan
[3] State Grid Sichuan Electric Power Research Institute, Chengdu, 610072, Sichuan
来源：
Liu, Tianqi (tqliu@scu.edu.cn) | 1600年 / Power System Technology Press卷 / 44期
关键词：
Characteristic equation; Damping torque coefficient; Hydro-turbine governor; Optimal PID parameter setting; Ultra-low frequency oscillation;
D O I：
10.13335/j.1000-3673.pst.2019.0342
中图分类号：
学科分类号：
摘要：
In recent years, many ultra-low frequency oscillation events have occurred in Chinese and foreign power grids. Relevant researches find out that the main reason for occurrence of the oscillations is that the turbine governing system exhibits significant negative damping in ultra-low frequency range. Therefore, based on the model of single-machine system, the characteristic equation of the closed-loop transfer function of the single-machine system is analyzed. Furthermore, the damping characteristics of the turbine governor are analyzed to further explain that the ratio between proportional and integral parameters is too small, leading to too small damping torque coefficient. This would cause speed regulation system to provide negative damping to the system, and cause ultra-low frequency oscillation. The internal cause of the ultra-low frequency oscillation is thus explained from the mechanism. Then, aiming at the single machine system, an optimal PID parameter setting method based on the control parameters of the turbine governing system is proposed. This method restrains the ultra-low frequency oscillation and has regulating performance of the governing system. Moreover, comparison with particle swarm optimization algorithm shows validity and superiority of this optimization method. Finally, effectiveness of the PID parameters of the optimized speed regulation system in increasing system positive damping to suppress the ultra-low frequency oscillation is verified in a four-machine two-zone system. © 2020, Power System Technology Press. All right reserved.
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页码：1008 / 1015
页数：7
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