Visualization Of Static Voltage Stability Region Of Power Systems

In the recent years, many voltage collapse accidents have happened in the powersystems of different countries, including the American and Canada 8.14 accident, allof these brought tremendous economic losing and very bad social influence.Therefore to seek a kind of perfect voltage stability monitoring means has become thehotspot of current research.The so-called cut-set power space in this thesis consists of the active power flowin cut-set lines. The static voltage stability region in cut-set space (CVSR) means thefeasible operation region in which any point can meet system voltage stabilityconstraints, electric current limits of lines, voltage limits of buses and power limits ofinjections. The recent studies on static voltage stability region in cut-set space showedits boundaries can be approximated in HP (hyper-planes) in large ranges, and theboundary appears a plane in 3D space. This fact reduces the realization difficulties ofthe visualization algorithms, has crucial significance to develop a kind of voltagestability monitoring system.The research of visualization applied in power system has recently begun. Fromits content, most of the visualization studies are absorbed in the operation state ofpower system, but the visualization application to the problem of stability is absent.All the research of this thesis is based on the conclusions of static voltage stabilityregion in cut-set space. The author uses OPENGL as the 3D visualization tool, andstudies the visualization problem and its engineering applications, so that thefollowing results are derived:First, the author developed a software package in the environment of VISUALC++ on the WINDOWS operation system, implanted OPENGL to the C programminglanguage, aimed at realizing a kind of genuine 3D effect, described the 3D planes andits 2D projections.Second, another software package using MOTIF on the UNIX platform has beendeveloped for the use of power system voltage stability monitoring. It can provide tothe users the voltage stability margin in different power flow increasing directions onthe same cut-set, display the boundaries of voltage stability region as planes in3-dimension and lines in 2-demension. The operators in dispatch center can takecorrect and timely emergency measures according these results. This softwarepackage has run in He-Nan Electric Power Dispatching and Communication Centersuccessfully.Third, the data interface between the voltage stability monitoring system and theEMS of He-Nan power system has been achieved, and it can provide elementary datafiles for the calculation of power flow and stability analysis.