Dispersed generation is preferred to renewable recently due to economy and enviromental issues.
They have positive and genative effects on power grids.
Advantages: You can generate whenever you want to consume, so tranmission losses will become less. That is the technical point of view, plus enviromental advantages will be there as well.
Disadvantages: that generates two way of power flow that may be messed up with protection and overvoltages on some busses that needs to be controlled.
This list can be extended and open for discussions.
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