Closed-loop design for two parallel connected converters with power factor correction

A large signal simulation for two parallel converters in a distributed power supply system is presented in this paper. The distributed system is composed of switched-mode power factor correction (PFC) converters utilizing a central limit control technique. This technique allows one voltage loop compensator to be shared by all the PFC converters. Design of such a compensator is discussed and the system performances with regard to unequal cable resistances and load changes are reported. The resulting system achieves a power factor of about 0.98 and provides an excellent current sharing between the two converter modules.