Is there any source or suggestion available to help interpret the results from a load flow analysis such explaining conceptually why overvoltages result when the load increases, and how one might remedy the problem?

Thanks,

 

Power System Analysis: Short-Circuit Load Flow and Harmonics

http://www.amazon.co.uk/Power-System-Analysis-Short-circuit-Engineering/dp/0824707370/ref=sr_1_1?s=books&ie=UTF8&qid=1323199213&sr=1-1