Damping Torque and Synchronous Torque Analysis of Power System Ultra-low Frequency Oscillation

被引：0
|
作者：
Gao J. [1 ]
Li G. [1 ]
Wang K. [1 ]
Zhang H. [2 ]
机构：
[1] Key Laboratory of Control of Power Transmission and Conversion (Shanghai Jiao Tong University), Ministry of Education, Minhang District, Shanghai
[2] State Grid Sichuan Electric Power Research Institute, Chengdu, 610041, Sichuan
来源：
Dianwang Jishu/Power System Technology | 2020年 / 44卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Damping torque method; Hydropower unit; Synchronous torque; Ultra-low frequency oscillation;
D O I：
10.13335/j.1000-3673.pst.2018.2375
中图分类号：
学科分类号：
摘要：
Recently, there are many cases of ultra-low frequency oscillations(ULFO) in power grids where hydropower units account for a large proportion, with the frequency below 0.1Hz. Analysis of existing studies assumes that the generator power is determined by the frequency characteristics of the load, while the electromagnetic connection between the generator and the system is ignored. In addition, the damping properties of electromagnetic power are also not clear enough in this model. For this issue, the damping characteristics of mechanical power and electromagnetic power of hydropower units are analyzed based on the single-machine and equivalent two-machine systems, respectively. Based on analysis of the actual phasor measurement unit(PMU) waveform of ULFO in Yunnan, it is derived that the phases of hydroelectric generator power angle fluctuation and the frequency fluctuation are nearly the same, and electromagnetic power oscillation is caused by power angle fluctuation. Theoretical analysis and simulation results show that in this ULFO case the hydropower units have sufficient synchronous torque and there is no risk of non-oscillation instability. © 2020, Power System Technology Press. All right reserved.
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页码：1001 / 1007
页数：6
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