Dynamic Simulation Model of a Quasi-Z-Source Inverter with Parasitic Resistances and Saturable Inductor

In this paper, an advanced simulation model of a quasi-Z-Source inverter (qZSI) is presented. The model has been built in MATLAB-Simulink by using only standard blocks. It is based upon the qZSI's nonlinear differential equations, i.e., without resorting to state-space averaging and small-signal analysis. In the proposed model, the equations for the non-shoot through state and those for the shoot-through state are alternately executed, depending on the qZSI state. The parasitic resistances of the qZSI capacitors/inductors as well as the magnetic saturation of the qZSI inductors are all accounted for. The impact of these factors on the qZSI's transient and steadystate performance is evaluated and analyzed both on the simulation and experimental level.