Troubleshooting and analysis of ultra-low frequency oscillation mode in power system

被引：0
|
作者：
Wang G. [1 ]
Yu Z. [2 ]
Zhang Y. [2 ]
Li Y. [1 ]
Tao X. [1 ]
Li W. [1 ]
Tang Y. [1 ]
机构：
[1] China Electric Power Research Institute, Haidian District, Beijing
[2] National Power Dispatching and Control Center, Xicheng District, Beijing
来源：
Dianwang Jishu | / 8卷 / 2324-2329期
关键词：
FLC; Hydro-turbine governor; Isolated power system; ULFO;
D O I：
10.13335/j.1000-3673.pst.2016.08.011
中图分类号：
学科分类号：
摘要：
Recently, ultra-low frequency oscillation (ULFO) emerges in DC island sending system and isolated power system, especially where high proportion of hydro-turbine generators exists. To find oscillation reasons, this paper established a typical DC island sending system, and analyzed ULFO stability with eigenvalue analysis and time domain simulation method to quickly troubleshoot negative damping oscillation modes caused by prime mover and governor. Simulations indicate that if turbine governor works, ULFO may appear in power system and damping ratio will decrease when generator governor operates at a higher speed. Eigenvalue analysis shows that real parts of eigenvalues are located in right side of complex plane and not stable. Study indicates that governor control mode and parameters, such as water hammer effect time constant, frequency gain, PID parameters, can significantly change eigenvalue positions in complex plane. Governor parameter optimization based on sensitivity analysis can enhance mode damping ratio, but with drawback of reducing primary frequency regulation ability of generator. Frequency limit controller (FLC) can regulate DC power or DC current in a fast and stable way, beneficial to primary frequency adjustment of governor optimization. Dead band of FLC should not be too wide and its value can be set with reference of primary frequency regulation dead zone of generator. © 2016, Power System Technology Press. All right reserved.
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页码：2324 / 2329
页数：5
相关论文
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