Abstract
In wide area backup protection of electric power systems, the prerequisite of protection device's accurate, fast and reliable performance is its corresponding fault type and fault location can be discriminated quickly and defined exactly. In our study, global information will be introduced into the backup protection system. By analyzing and computing real-time PMU measurements, basing on cluster analysis theory, we are using mainly hierarchical cluster analysis to search after the statistical laws of electrical quantities' marked changes. Then we carry out fast and exact detection of fault components and fault sections, and finally accomplish fault isolation. The facts show that the fault detection of fault component (fault section) can be performed successfully by hierarchical cluster analysis and calculation. The results of hierarchical cluster analysis are accurate and reliable, and the dendrograms of hierarchical cluster analysis are in intuition.
Highlights
Electric power system is one of the most complex artificial systems in this world, which safe, steady, economical and reliable operation plays a very important part in guaranteeing socioeconomic development, even in safeguarding social stability
The facts show that the fault detection of fault component can be performed successfully by hierarchical cluster analysis and calculation
Bus-1, Bus-A and Bus-B have constituted accurately the fault section. These results are entirely identical with the fault location set in advance, so we can confirm exactly fault location by the hierarchical cluster analysis based on node positive sequence voltage
Summary
Electric power system is one of the most complex artificial systems in this world, which safe, steady, economical and reliable operation plays a very important part in guaranteeing socioeconomic development, even in safeguarding social stability. If protection devices can operate rightly, quickly and reliably, the deterioration of system status will be checked effectively, it will play a decisive role to protect electricity grid’s safe operation Otherwise, it will accelerate system crashes, as a result, large-scale and long-time power blackout will continue. WAMS can obtain synchronously electrical measurements in the whole power system, and realize power system dynamic process monitoring and control It can decrease the update speed of measurements from seconds to tens of millisecond, and create condition to realize power system dynamic process control, which will help us carry through backup protection design based on global optimal angles of electricity grid, and afford the possibility for resolving dynamic security monitoring, control and protection of complex largescale electricity grid. We are using mainly cluster analysis of multivariate statistical analysis theory to resolve fault detection problem in wide area backup protection of electric power systems
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