A Three-Phase Seven-Level Active-Rectified Interleaved Flying Capacitor Converter with Distributed Loss and Improved Reliability

In recent years, the rapid development of energy storage systems has put forward higher efficiency and higher reliability requirements for bidirectional AC/DC converters. This paper presents a three-phase seven-level active-rectified interleaved flying capacitor converter with more distributed loss and improved reliability. It gives the derivation, modulation and control principles of the converter and simulation results under rectifier mode. Detailed loss distribution and reliability analysis are given. Proposing a fault control unit, it verifies that the converter can still operate fault-tolerant when some switches are short-circuited. Based on Markov chain Method, it can be seen that the reliability has been improved further by adding the fault control unit.