In my opinion the hybrid approach will be the most interesting such as the combination of two meta-heuristic techniques and there are several examples through the references.
Please take a look at those links.
Article Optimal Power Flow Solution for Combined Economic Emission d...
Article Optimal Power Flow-Based Combined Economic and Emission Disp...
But Prof, how do we know what is best parameter for the PSO and other algorithms? As far as I understand optimal value depends on the proper tuning of the hyper parameters.