多机电力系统中PSS位置确定及密集模态分析

With the increase of power system, the size of the entire power system is more complex, and its low-frequency oscillations are becoming increasingly prominent, and this threaten seriously the safe and stable operation of power system. The use of participation factors and extension analytic hierarchy process determine the location of PSS. After the system installed PSS, the damp of system transfer between the various models. With the increase of generator’s number, oscillation modes of the power system are more and more. Because the frequency of low frequency oscillation modes are in a narrow range, it will be very close a lot of frequency of oscillation modes. So the power system will have the characteristics of closely spaced modes, which will have an important impact on the power system dynamic stability and analysis. In this paper, the determinant of closely spaced modes is proposed. The degree of denseness and dispersion is defined in the closely spaced modes system. Some characteristics of closely spaced modes system are proposed. Application of the New England 10 machine system as an example to validate the results of this paper is correct.