A hybrid AC-DC-AC matrix converter with a boost circuit

摘要

A new type of AC-DC-AC BoostMC (Boost Matrix Converter) based on Boost circuit is presented, by connecting a Boost circuit operating in the state of high frequency to the middle direct current link of AC-DC-AC matrix converter. The voltage transfer ratio of matrix converter is increased through utilizing the voltage increase function of Boost circuit. In this paper, the mathematic model of BoostMC is deduced, and discontinuous conduction mode (DCM) of Boost circuit is discussed. This new topology is analyzed, and the control strategies of rectifier stage, inverter stage and middle boost circuit are studied. Simulation confirms the validity and effectiveness. The results indicate that the voltage transfer ratio can be higher than 1.0, the output voltage waveform is very close to standard sine wave, and the harmonic contents increase slightly, which is mainly composed of high harmonics around of switching frequency.