Simulation of Three-Phase Five-Level Inverter Using Reverse Voltage Topology

Abstract

Performance of multi-level inverters is highly superior to conventional two-level inverter, so they have been widely used for high-power high-voltage applications. Due to higher number of sources, lower EMI, lower % THD and less stress on insulation, they are widely used. However, it has some disadvantages as complicated PWM controlling method, increased number of components and voltage balancing problem at neutral point. In this paper a new topology called Reverse Voltage is proposed to improve multi-level performance by compensating the disadvantages just mentioned. This topology requires fewer components compared to available multi-level inverters (especially in higher levels) and requires less carrier signals and does not need separate mechanism for balancing of the capacitor voltages. The topology and the control method based on SPWM are shown and the required components are also compared to other topologies to show the superiority of the topology. Finally simulation results on different types of loads are presented and discussed.