DELAYED POWER SYSTEM STABILITY ANALYSIS METHOD BASED ON LOW-ORDER EIGD

摘要

The present invention provides a low-order and explicit infinitesimal generator discretization (EIGD) method for small signal stability analysis and control of large-scale delayed cyber-physical power system (DCPPS), and a system thereof. The system based on low-order EIGD method comprises the large-scale interconnected power system, wide-area measurement system (WAMS) and wide-area damping controller(WADC), forming a platform for dynamic monitoring as well as stability analysis and control of the large-scale interconnected power system. The method comprises that the dynamic model of DCPPS is established and linearized into a set of delayed differential equations; the state variables of DCPPS in delayed differential equations are rearranged and partitioned into two parts: delay-free state variables and delayed state variables; by utilizing the infinitesimal generator, the delayed differential equation is transformed into the ordinary differential equation; correspondingly, the characteristic equation of DCPPS can be transformed into the general characteristic equation that is described by the infinitesimal generator; the eigenvalues of DCPPS are identical to eigenvalues of the infinitesimal generator. By rearranging the state variables of the system, the present invention eliminates the discretization of the state variables not related to the time delay, reduces the dimension of the discretization matrix, and thereby reduces the calculation amount of the critical eigenvalues calculation of DCPPS.