Studies on robust control of parallel operating dc/dc converters

In this paper, an optimal robust control approach for parallel operating dc/dc converters is presented. Various types of controllers using frequency domain optimization method based on mu-optimality framework are designed. Different structures of low-order controllers, decentralized controller and a new controller based on Internal Model Control (IMC) theory are developed to improve the robust performance of parallel operating dc/dc converters against uncertainties and disturbances. The proposed controllers are robust for setpoints and/or for disturbances. Finally, a comparison between the performance of the closed-loop system with designed robust decentralized and IMC controllers is obtained.