Analysis of multipulse rectifiers with modulation in DC circuit in vector space approach

Rectifiers consisting of parallel connected 6-pulse bridges with modulation in DC current circuit show properties of 24-, 36-pulse or multipulse rectifiers. The analysis of such rectifiers was conducted by means of the space vector method. A load unbalance of the component bridges of 12-pulse rectifier generates the intermediate position of space vector on a complex plane. An increase in the number of the intermediate positions approximates the space vector to the case of rotating one. In this paper topologies of multipulse rectifiers with modulation in DC current circuit are presented. The simulation results of investigations were obtained by means of the space vector for control of modulators.