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Whether transmission voltages will rise or decrease is a matter of the voltage control mode in which you set the RE plants. In case they operate predetermined power factor you should not allow reactive power changes at the renewable terminal buses.

If on the other hand you model the renewable plants as PV buses with specific reactive power limits, then voltage will be controlled by the plant, thereby reactive power will be injected or absorbed depending on the bus voltages of the neighbor area.

What I think you need to do is that you should set a specific power factor on each renewable plant. This will treat the particular bus not as a PV, but rather as a PQ and voltages will result from the load flow calculations..