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. According to this technique, the averaging process is applied across one pulse width modulation sampling period T
_S
, thus resulting in the basic 5L T-RECT mathematical model. Consequently, the ac-dc steady-state operation is analyzed through the achieved model. The large-signals model of the 5L T-RECT has been verified by means of 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.