Research On Warning System Of Cascading Failure Of Daqing Oil-field Grid

In recent years, some big blackouts occurred in many countries around the world have brought tremendous damages. Such catastrophic events were usually caused by cascading tripping of some power system devices(cascading failure ).So, studies on the mechanism of cascading failure and preventive approaches to avoid blackouts in power systems had become an important hot topic.This paper is based on the Daqing oil-field grid, it studies the power system of 110kV and 35kV, then finishes developing system of cascading failure. The model of Daqing oil-grid can be got from the connection of power system. It is more useful and rapid to choose the initial fault when we combined the margin of active power and open distribution coefficient. Then ,we need the N-b analysis to determine which line nearly to overload because the active power of the line is larger than the max active power, it continues to cut the overload line until the depth of searching is bigger than 6 or the system is destabilization. We can get the results of every corresponding open line, in the end, we can draw the fault tree according to the results. After the qualitative analysis and quantitative analysis of fault tree, we can get the probability and the minimal cut sets of top event. These achievements can offer a reference to protect the security of oil-field grid, and have a high economical efficiency and enhance the ability of solve problems.