Simulation Model Of 15KVA UPS

I am doing a project on Evaluation of Harmonics and power Quality Improvemant. In that i need to simulate 15KVA UPS model feeding 7 computers. Can i simulate this using MATLAB/PSPICE ? Can i get the same results as i got in the practical case? [And it is not PWM UPS].

How to design passive filters for both 1 phase and 3 phase systems ? I referred Roger,Dhugan. Any book other than this ?