When I drive to uni (not often) I park at Macdonaldtown station. It's a bit of a walk to uni but it's free and (if you park in the right place) untimed.
Or find a friend who lives in Redfern. If I'm stuck and I ask the day before I can park in my friend's backyard on Abercrombie St.
Generally I suck it up and catch public transport. Even driving to your closest train station is easier than trying to find a park at uni.