A practical direct method for determining dynamic security regions of electrical power systems

The dynamic security region (DSR) of an electrical power system has been accepted more and more for providing plenty of security information and good prospects in online application. This paper presents a direct method for determining the practical DSR (PDSR) via the analysis of transient energy. The key feature of such a method is the parallel character of the boundaries of transient stability region at the exit points under different critical power injections. Based on this parallel character, a hyper-plane expression of the boundary of the PDSR and corresponding algorithm are proposed in the paper. The method developed is simple and fast. It has been evaluated on the New England Test System, which agrees closely with the results of simulations.