Three-Phase Modular PFC Converter in Continuous Conduction Mode

Present day standards and applications require power electronic ac- dc converters that can operate over a wide range of load variations with approximately unity power factor, controlled dc bus voltage, low input current distortion, and a simple controller. Power factor correction (PFC) techniques can be a practical solution to unidirectional rectifiers since they reduce the number of devices, and improve the efficiency and power system quality as well. This paper presents a new topology of a modular three-phase AC-DC converter. The presented PFC converter can produce a controlled dc output voltage, near-unity power factor, and high efficiency. By operating in the continuous conduction mode (CCM) with an active approach which is one class of high-quality three-phase rectification, the required features are achieved. The performance of the topological structure of the presented converter is discussed and investigated under various modes of operation to identifies their merits and limitations. Extensive simulation is carried out using PSIM software to validate the explained function.