Stability Analysis of Ultra-low Frequency Oscillation and Governor Parameter Optimization for Multi-machine System

被引：0
|
作者：
Huang W. [1 ]
Duan R. [1 ]
Jiang C. [2 ]
Zhou J. [2 ]
Gan D. [1 ]
机构：
[1] Yunnan Electric Power Dispatching and Control Center, Kunming
[2] College of Electrical Engineering, Zhejiang University, Hangzhou
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2018年 / 42卷 / 21期
关键词：
Governor; Nyquist vector margin; Primary frequency regulation; Ultra-low frequency oscillation;
D O I：
10.7500/AEPS20180215003
中图分类号：
学科分类号：
摘要：
A sustained ultra-low frequency oscillation occurs in Yunnan Power Grid after asynchronous interconnecting to China Southern Power Grid. The mechanism of ultra-low frequency oscillation is analyzed theoretically based on the Nyquist vector margin. The result shows that the large phase lag of hydro-power unit at the oscillation frequency, which is brought by the right half plane zero in turbine transfer function, is the key cause of ultra-low frequency oscillation. To avoid the reduction of tracking performance due to the disabling of governors, an optimization method of parameter in frequency domain for governor is proposed to maximize the tracking performance under robust stability constraints, which guarantees the stability margin in various operation points and optimizes several governors simultaneously. Case studies of Yunnan Power Grid validate the effectiveness of the analysis and optimization method. © 2018 Automation of Electric Power Systems Press.
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页码：185 / 191
页数：6
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