MATLAB Simulation of Sinusoidal Pulse Width Modulation based Three and Seven Level Current-Source Inverters

Abstract

Here, a multilevel current-source inverter (MCSI) topology is analyzed. Here, the issue of constructing a novelmodular single-rating inductor MCSI has been explored. The proposed topology isbuilt with identical modules where all inductors carry the sameamount of current, simplifying the construction and operationof industrial applications with higher efficiency. A new state machine approach with a proper implementation of the phase-shifted carrier-sinusoidal pulse width modulation (PSC-SPWM) allows both current balancein all modules and effective switching-frequency minimization. The performance of the MSCI proposed is simulated with MATLAB. As a result of this topology and PSC-SPWM utilization, current balance was achieved in both main and sharing inductors, even under load and operating point changes. The switching frequency was drastically reduced with a new state machine approach, taking the advantage of the three different zero-states of the topology. The topology adopted allows operation with high efficiency by reducing the current through the inductors and the losses in the switches.