Cascading Failure model (Problem in dispatch)

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Hi all,

I would like to model cascading failure using python and PSSE as follow:-

1- Calculate the power flow at normal condition by using DC linear model. 2- Trip number of selected branches. 3- Rebalance the load and supply (Dispatch). 4- Recalculate the Power flow (DC linear model). 5- Remove/Trip the new overloaded links and back to step(2).

The problem that I face now is how to achieve step_3 (Dispatch and load shedding).

Thanks in advance.