电网电力系统稳定器的交互影响分析

Analysis on the Interactive Influence of Power System Stabilizers in Provincial Power Grid

随着我国大区域电网互联的发展,低频振荡已是影响电力系统稳定的重要因素之一。目前,在发电机励磁系统上安装电力系统稳定器(PSS)仍是抑制低频振荡的一种较为经济和有效的方法。在分析了多机系统中PSS的交互影响并考虑多机系统PSS的相关性的基础上,采用特征值灵敏度分析法确定机电振荡模式,建立了优化模型。由特征值对PSS增益的灵敏度构成目标函数,实现了发电机对各机电模式的有效参与,从而求得系统中各机电模式与主参与机组PSS的对应关系。某省级电网系统的计算和分析,验证了所述方法的可行性。

Along with the development of large regional power grid interconnection in our country,the low frequency oscillation becomes important factor affecting the stability of the power system.At present,installing power system stabilizer （PSS） in excitation of generator is still the one of the most economical and effective method to suppress low frequency oscillation.On the basis of analyzing the interactive influence of the power system stabilizers in multi-generator system and considering the correlation of PSS in multi-generator system,the electromechanical oscillation mode is determined by adopting eigenvalue sensitivity analysis method,and the optimization model is established.The objective function is built by the sensitivity of eigenvalue to the gain of PSS to implement the effective participation of generators to each electromechanical mode,thus the corresponding relation between each electromechanical mode and the PPS in mainly participating unit.The feasibility of the method proposed is verified through the calculating analysis of the power grid in certain province.