Open the data/basic.cfg file, near the top you'll see this:
[RENOWN]
RenownReachGridObjCompleted=0
RenownPatrolGridObjCompleted=0
CompletedPatrol=0
NEUTRAL=-1
ALLIED=1
AXIS=-10
WrongShipSunk=-5000
FirstRankRenown=100
SecondRankRenown=350
EndCampaign=-5000
The first two lines are what you need to edit. Replace the zero at the end of each line with the renown amount of your choice. Stock file looks like this:
[RENOWN]
RenownReachGridObjCompleted=500
RenownPatrolGridObjCompleted=200
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