Study The Model Of Cascading Outage And Its Analysis Method Based On Casual Relationship

As the enlargement of power system,the cascading outrage caused by local failure leads to serious impact.So it becomes more and more necessary to study the cascading failure. Line distribution factor is defined in this paper according to power flow transfer after the fault of line.It can express the causal relation among lines and can be used to calculate power flow.In this paper it studies the search method of cascading outage based on lines' distribution factors.In order to ensure the probability of cascading failure' path,it screen the lines based on the probability of prioritization in the process of searching.It also define the key transmission section and study the search method of key transmission section.The system of New England 10-unit 39-bus is used to simulate the cascading outage paths and the key transmission sections of power system.The results indicate that the proposed method can find the cascading outage paths and key transmission sections.