New Models of a Z-Source Inverter Built of Standard MATLAB Simulink Blocks

In this paper, two new simulation models of a Z-Source inverter (ZSI) system are proposed. These models have been built only out of standard MATLAB-Simulink blocks. The proposed models have been developed using two sets of differential equations – for the non-shoot-through and shoot-through states – which are alternately executed, depending on the ZSI state. In the first model, this is done by alternately triggering two separate subsystems, each corresponding to one of the ZSI states. In contrast, in the second model, both ZSI states are programmed by using the same Simulink blocks, contained within a single unified subsystem; the interaction between the blocks is, however, altered based on the same trigger signal. For comparison, another model of the ZSI system has been developed in additional MATLAB SimPowerSystems toolbox. Results for various types of loads for all three models have been compared and discussed. Key-Words: Impedance-Source inverters, Z-Source inverter, Modulation techniques, Maximum constant boost control, MATLAB-Simulink, SimPowerSystems