Influencing Mechanism Study on Turbine Governor Parameters Upon Ultra-low Frequency Oscillation of Power System

被引：0
|
作者：
Deng W. [1 ]
Wang D. [1 ]
Wei M. [1 ]
Zhou X. [2 ]
Wu S. [3 ]
He P. [2 ]
Kang J. [1 ]
机构：
[1] School of Electrical Engineering, Southwest Jiaotong University, Chengdu, 610031, Sichuan Province
[2] Yunnan Electrical Power Experiment Institute, Co., Ltd., Kunming, 650217, Yunnan Province
[3] Yunnan Electric Power Test & Research Institute Co., Ltd., Kunming, 650217, Yunnan Province
来源：
Dianwang Jishu/Power System Technology | 2019年 / 43卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Damping torque coefficient; Hydraulic turbine; Oscillation frequency; Speed regulating system; Ultra-low frequency oscillations;
D O I：
10.13335/j.1000-3673.pst.2018.1095
中图分类号：
学科分类号：
摘要：
In actual power grids, ultra-low frequency oscillations occur many times, and the negative damping generated by speed control system is an important cause of frequency oscillation. In this paper, the damping torque coefficients of hydraulic turbine speed regulating systems with and without consideration of PID parameters are derived; and the damping characteristics of hydraulic turbine governing system are analyzed with dividing frequency and actual oscillation frequency. Based on single machine system, PSO algorithm is used to optimize the PID parameters of the governor. The objective function takes into account the speed deviation of the turbine and the damping torque of the speed regulating system at the same time. The damping torque method is used to compare the damping changes before and after the optimization, and the positive damping of the system is increased with additional controller to suppress the ultra-low frequency oscillation. Finally, in a 4-machine 2-area system and a practical DC islanded system in Yunnan power grid, it is verified that the ultra-low frequency oscillation is caused by the negative damping produced by the speed control system. © 2019, Power System Technology Press. All right reserved.
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页码：1371 / 1377
页数：6
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