Dynamic simulation model of a quasi-Z-Source inverter with parasitic resistances and saturable inductor

Abstract

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 steady-state performance is evaluated and analyzed both on the simulation and experimental level.