I know there have been some in the past mostly from Milestone such as Static, Icon, Hardware. Then there were some straight from DC such as the Azrael series with Michael Lane, Orpheus had a mini series, Black Lightning I hear had a series, Batwing currently but that's not going on much longer, they did start the New 52 with a Mr. Terrific series that didn't go too far, I'm pretty sure John Stewart may of have been the focal point of the Green lantern series at one time. But I can't think of much else.
DC I feel doesn't have enough solo series for Black Superheroes, and they do have some that would make for some interesting stories, such as Bloodwynd a character who gets his powers from a cursed gem that carries the souls of his dead enslaved ancestors, I really would like to see Icon make a come back, same with Michael Lane as Azrael, and Static should get his own series again.