Assessment of dynamic stability of large-scale power system by Rayleigh's quotient

被引:0
|
作者
Kakimoto, N [1 ]
Sugano, K [1 ]
机构
[1] KANSAI ELECT POWER CO,OSAKA,JAPAN
关键词
Rayleigh's quotient; large-scale power system; dynamic stability;
D O I
10.1002/eej.4391160207
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A method of assessing dynamic stability of large-scale power system by Rayleigh's quotient is proposed. One-machine infinite-bus systems show damping torque characteristics similar to diagonal components of operational transfer matrices for original multimachine systems, which means that design of PSS with one-machine systems controls those components. An expression for damping constants of oscillation modes is derived based on an energy function and its time derivative-for a simplified system representation. This expression demonstrates that oscillations do not necessarily become unstable even if there are some generators with negative damping; and the effect of damping torque is determined by eigenvectors. The expression is generalized with Rayleigh's quotient, and a method of estimating eigenvalues of large-scale power systems is proposed. With this method, approximate eigenvalues are refined to accurate eigenvalues. Only a specified number of eigenvalue analyses are required irrespective of the number of generators, hence much calculation is saved. Finally, this method is applied to a 107-machine system to verify its effectiveness.
引用
收藏
页码:77 / 87
页数:11
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