Have not done much research into centralized mining but closest thing I've heard was Ripple so maybe look into that for more info?
Ripple does not mine, but is decentralized...
If you want centralized altcoins there was one a few years back with a similar approach to PoS (Realcoin or something like that?). Most centralized solutions seem to be pegged to USD, EUR etc. though.
LindenDollars (SLL) are also some centralized altcoins, but there is no source code available for them.