Novel algebraic PWM strategy of a multilevel Voltage Source Inverter

In this paper, the authorpsilas present one algorithm of algebraic PWM strategy for seven-level neutral point clamping (NPC) voltage source inverter (VSI) is presented. This algorithm uses a control model of the inverter developed previously by the authors. In the first part, we develop a working model of this inverter, without presumption on its control, by using the connection functions of this converter. In the second part the control models of this converter by using respectively instantaneous and generating connection functions are reviewed. In the last part, one algebraic PWM control strategy of the inverter is proposed. The obtained results are full of promise to use this digital strategy to control seven-level NPC VSI used in high voltage, high power applications as electrical traction.