Development of three-phase switch-mode rectifier using single-phase modules

This paper presents a three-phase (3(phi)) switch-mode rectifier (SMR) consisting of three 1 (phi) SMRs, two centertapped autotransformers and three changeover switches. The ac input sides of three modules are (Delta)-connected, and their dc output sides are connected in parallel. As any one module fault occurs, the remaining two modules becomes modified Tconnected and continuously perform three-phase rectification with good line drawn power quality. When two constituted 1 (phi) modules are faulted, the proposed 3(phi) SMR will be operated as 1(phi) SMR. The quantitative and robust voltage regulation controls for the developed SMR are made to consider the effects of changes of system parameters, operating condition, and number of connected modules.