Analysis on Impact of Enhanced Governor on Ultra-low Frequency Oscillation in Yunnan Power Grid of China

被引：0
|
作者：
He Y. [1 ]
Zhang Y. [1 ]
Chen Y. [1 ]
Mo W. [2 ]
机构：
[1] China Southern Power Grid Dispatching and Control Center, Guangzhou
[2] School of Electric Power, South China University of Technology, Guangzhou
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2019年 / 43卷 / 13期
关键词：
Asynchronous interconnection; Frequency stability; Governor; Ultra-low frequency oscillation;
D O I：
10.7500/AEPS20190123001
中图分类号：
学科分类号：
摘要：
Enhanced governors are adopted in some hydroelectric units in Yunnan power grid, which causes the ultra-low frequency oscillation and threatens the frequency stability of power grid seriously. In order to reveal why the enhanced governors of hydroelectric units affect the frequency of Yunnan power grid of China, the theoretic calculation and time-domain simulation are conducted on dynamic behaviors when the system frequency difference across the dead zone of primary frequency regulation from different directions. It is demonstrated that the enhanced governor does not have a stable equilibrium point near the dead zone of primary frequency regulation of hydroelectric generator, and when the system frequency difference slowly passes back to the dead zone, a phase lag of about 90 degrees is introduced in ultra-low frequency band, thus reducing the safe and stable margin of the system frequency. Finally, the eigenvalues of a single-machine system including hydro turbine, governor and generator models are calculated with the aid of small disturbance analysis tools. Through the comparative simulation, it is shown that the enhanced governor not only has similar negative damping effect with the water hammer in ultra-low band, but also is the one of the disturbance sources of ultra-low frequency oscillation, which keeps ultra-low frequency oscillation continuous and unable to attenuate. © 2019 Automation of Electric Power Systems Press.
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页码：185 / 190
页数：5
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