Visualization Of Practical Dynamic Security Region

Different from traditional "point-wise" approach, the method of Dynamic SecurityRegion (DSR) is a completely new methodology in power system dynamic securityanalysis. It is a set defined in injection space for specific fault and specificconfigurations of pre-fault and post-fault power system. Every operation point thatlies in it can guarantee transient stability of the system. It can be calculated off-lineand applied on-line to determine whether an operation point is secure under a givenfault by judging whether the current injection lies inside the DSR.One of the important revelations of 8.14 blackout of US-Canadian power systemis that we should strengthen the visualization of electrical power systems, to help thedispatchers to monitor and control electrical power system security. Recent years,through a lot of research it has been shown that a DSR in injection space of a realpower system is surrounded by vertical hyper-planes that are the upper and lowerlimits of every bus injection, and one or several hyper-planes that describe the criticalpoints of transient stability in power injection space, which is named as PracticalDynamic Security Region (PDSR).For specific fault and specific configurations of pre-fault and post-fault powersystem, the PDSD is exclusive, and has no change with operating states. However thedimension of the injection power space is too high to realize visualization in 2D spaceor 3D space directly. Therefore this paper developed an approach for reducing thedimension of PDSR from very high to three with insuring that after the dimensionreduction, the PDSR is also approximately exclusive for a specific fault and specificconfigurations of pre-fault and post-fault power system and is invariable wheninjection power is changed. This paper denominate the PDSR whose dimension hasbeen reduced analogous PDSR (L-PDSR). By visualizing the L-PDSR the dispatcherscan monitor the system security and make decision of security control more quicklyand correctly. In addition, for PDSRs of different contingencies in contingency set, weexpect that we can observe their intersection (namely integrated security region) inone reference frame, so this paper explored this possibility aiming at a real powersystem of our country. At the same time, based on above-mentioned dimensionreduction approach the author has correspondingly developed a visualization system.