Dirty Power is an all encompassing non technical term.
There are several issues that fall under this term, sags, surges, brown outs, harmonics, neutral ground current issues, and many other issues.
Do a web search of any of the terms noted and you will get a wealth of information and with most web searches some helpful and some BS. There are tons of books available, from the Soares Book on grounding to numerous power quality books.
If you like a list of intro type books IM me, I'll replay Wednesday when I get into the office.