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

This paper presents a three-phase (3φ) switch-mode rectifier (SMR) consisting of three 1 φ SMRs, two center-tapped autotransformers and three changeover switches. The ac input sides of three modules are Δ-connected, and their dc output sides are connected in parallel. As any one module fault occurs, the remaining two modules becomes modified T-connected and continuously perform three-phase rectification with good line drawn power quality. When two constituted 1φ modules are faulted, the proposed 3φ SMR will be operated as 1φ 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.