The modular multilevel converter (MMC) is a kind of converter commonly used for medium and high voltage applications, such as a high voltage direct current (HVDC) transmission, due to his modularity that allows reaching different voltage level. This paper reports a comparison study of a three-phase induction motor (3~IM) energy quality piloted by two different multilevel converters, the modular multilevel source voltage inverter (MMVSI) and the neutral point clamped source voltage inverter (NPCVSI). Indeed, the main purpose of this document is to show the interest of training the induction motor (3~IM) with the multilevel modular inverter (MMVSI), for this, we use a comparison with the (NPCVSI). For that, the two converters are controlled with a phase disposition pulse width modulation (PD-PWM) technique. Firstly, the mathematic models of the 3~IM, MMVSI and NPCVSI are given, then, control strategy for the two topologies and finally, the simulation analysis of the two systems has been done with MATLAB/SimPowerSystems and the different comparison aspects and results are shown and discussed.

Multiphase machines have interesting advantages in terms of torque ripple and rotor losses which will be lower compared to three-phase machines. Thus, the power of these machines can be done with multilevel inverters that offer good quality energy. The work presented in this paper consists of an analysis of the effect of control techniques of multilevel inverters feeding a dual-star induction machine. The waveform of the output voltage of the inverters depends on the topology of the inverter and its control strategy. We will present a comparative simulation study between three control strategies (PWM, RPWM and simplified SVM) for a three-level diode clamped inverter that feds a dual-star induction machine. The results of simulations will be discussed.

The use of high voltage direct current based voltage source converter (VSC-HVDC) in power transmission systems knows a great progress in recent years. Above all, with the new generation of power electronics converters such as the modular multi-level converter (MMC), with his scalable structure it can theoretically meet any voltage level requirement, which allows to increase the size of the power transferred compared to conventional converters. In this sense, this paper presents a study of a VSC-HVDC system based on a modular multi-level converter (MMC). The main objective of this work is to analyze the performance of the VSC-HVDC system based MMC without the AC filters and its control in the event of a fault, during set point changes and unbalanced grid conditions. After realization a mathematical model of the system studied and its control, simulations are done over in Simpower System/Matlab. The results obtained confirm the robustness of the system control and the system gives a good energy quality, that manifests by a good output currant and voltage curves with no need to use a voluminous AC filter.