电力系统强迫功率振荡的等效电路定位分析法

An Equivalent Circuit Approach to Locate Source of Power System Forced Power Oscillation

强迫功率振荡事故发生时,最有效的应对办法是找到扰动源。文中以单机无穷大系统中原动机注入不平衡功率引发强迫振荡为例,根据振荡达到稳态时线性化系统变量关系以及能量转化的特性,把强迫振荡的功率偏差和频率偏差用相量表示,再将稳态的振荡过程转化为一个电路进行分析,并将此电路分析方法推广到多机系统。在此基础之上,给出了4种判断扰动传播方向的方法,并据此找出扰动源所在的位置。通过10机39节点系统仿真验证了该方法的有效性。

The most efficient way to cope with forced power oscillation occurred in power system is to locate the disturbing source.Taking injecting unbalanced power into the prime mover of single-machine infinitive bus system to trigger the forced power oscillation as an example and according the relation among variables of a linearized system while the oscillation reaches its steady-state and the characteristics of energy transformation,the power deviation and frequency deviation of forced power oscillation are represented by phasors and the steady-state oscillation process is turned into a circuit to carry out the analysis,and then such a circuit analysis approach is extended to multi-machine system.On this basis, four methods to judge the propagation direction of the disturbance are given,and accordingly the location of disturbing source can be found out.The availability of the proposed approach is verified by simulation results of a ten-machine 39-bus system.