Low frequency state-space model for the five-level unidirectional T-rectifier

This paper presents the analysis and the validation of the large signals model of a new five-level T-type unidirectional three-phase rectifier topology known as 5L T-RECT. Proposed modeling approach is mainly based on the well-known state-space averaging technique. Accordingly, to this technique, the averaging process is applied across one PWM sampling period TS, thus resulting in the basic 5L T-RECT mathematical model. Consequently, the AC-DC steady state operation is analyzed according to the achieved model. The large signals model of the 5L T-RECT has been verified through the direct comparison with the converter full digital-switching model, realized in the Matlab/Simulink environment. Simulation results exhibit a good matching with the proposed average model.