Analysis of cascading failure considering load-shedding strategy and failure correlation

It is well known that cascading failure is one of the key factors which lead to blackout events around the world. How to simulate cascading failure reasonably is one of the important issues to be solved by electrical engineers. An ad-hoc cascading failure model based on probabilistic line outage and failure correlation is proposed in this paper. The proposed model involves AC power flow computation and all possible cases of cascading failure. In this model, some measures including the load shedding strategy and subsequent failure search strategy as well as probabilistic selection of line outage are taken into account during analysis. In addition, some risk indices are introduced to evaluate the vulnerability of power system caused by cascading failure. Finally, simulations performed on IEEE-39 bus test system demonstrate the validity and effectiveness of the proposed model and method as well as drawing some meaningful conclusions.