The rate at which space is expanding is not bounded by the speed of light -- this is because no information is being carried, space just grows indefinitely. The only things which are bounded by the speed of light are "real" things, in the sense of things that have energy or information.
To see an example of something "travelling" faster than the speed of light, stand on a beach on a windy day and measure the speed at which the wavefront meets the shore. You really need a diagram to see the point I mean, but imagine if the wave is travelling directly parallel to the shore, so that the wave front is at right angles -- then the speed at which that point moves along the shore will be the speed of the wave. If, on the other hand, the wave is hitting the beach head-on, effectively the speed at which that point moves across the beach is almost infinity! So things can travel faster than light all the time.
In this sense, then, a galaxy 30 billion light years away is perfectly possible, because the Universe needn't be (13.5billion years times the speed of light) across. As to why we can still see it, that's because distance takes on a slightly different meaning when there's Gravity. For more 'd need to go into a bit too much detail. But, basically, the 30 billion light years away measurement isn't distance as you think of it, but a different measurement altogether.