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I am performing a dynamic stochastic simulation in a power system by tripping multiple lines and generators in the grid. At the end of the simulation, I want to perform the load flow on the remnant grid. However, PSSE is not allowing since the generators are converted for dynamic simulation. What would be an effective way to perform load flow after a dynamic simulation

I would proceed in the following way:

1. Find the rating of each transmission line in the power network and evaluate the loading level at every instant of simulation. Loading level is the ratio of the MVA loading to the MVA rating of line. Based on the ratio a probability of tripping can be evaluated for each transmission line. This is motivated by the idea that the occurrence of a hidden failure is dependent on the overloading condition of the line.

2. Next, a Bernoulli trial can be considered for each transmission line with a probability of SUCCESS (probability of tripping) to be equal to the probability calculated in Step 1. For the transmission lines, where the outcome is SUCCESS, the line can be tripped. The success of this modelling would depend on the probability curve shape for different loading condition in the transmission line.

3. Finally, a load-generation balance needs to be maintained. For this, the tie lines between the control areas can be monitored for deviation. If a deviation is noted, loads in the particular control area can be removed. To do so efficiently, the Load Shift Factor can be calculated for each tie line and loads can be removed based on the entries of the LSF matrix.

Normally, my approach would be to create a bus subsystem of areas and monitor all the transmission lines within the subsystem. However, this increases my simulation time since I am not interested in all the lines. Also, I know the from bus, to bus and the circuit ID for the transmission lines I am interested in. Is there any way to create a subsystem of only those transmission lines so that I can get other values corresponding to these lines like 'STATUS', 'PU', 'MAXMVA' etc.