Decoupled Maximum Constant Boost Control for Quasi-Z-Source Inverter

Abstract

Maximum Constant Boost Control (MCBC) is one of the most suitable modulation techniques for Z-Source Inverters (ZSI) and quasi-ZSI (qZSI). Nevertheless, it cannot decouple the output voltage control and the fluctuations of the voltage source at the input of the inverter. This work proposes a new method based on this modulation technique that allows decoupling the control of these two variables, input and output voltages of a qZSI. The simulation results show that the Decoupled Maximum Constant Boost Control (DMCBC) has the same features and advantages than the one without decoupling. Voltage gain, stress and harmonic distortion are studied and the results show that the behavior is not modified, except for the reduction of the boost factor.