| The induction machine is widespread in AC drive system. The energy efficiency of the induction machine during dynamic regimes is up to 40%. Therefore, for the electrical drives with frequent dynamics (starting, breaking or reversing) the energy efficiency becomes a serious problem. The regenerative drive system is a solution to improve the energy efficiency in an elegant manner. This method requires of using an active front end rectifier instead of the uncontrolled rectifier, as in the conventional AC drives system. The authors proposed in this paper, a modern way to increase the energy efficiency of the drive system through the regeneration process. The power supply converter of the three-phase induction machine is designed in a modular manner, consisting of a series active power rectifier (APR), DC link, and three-phase power inverter. As regarding the DC link, the braking resistor is not necessary, the recovered energy during the braking process being delivered to the grid. Moreover, due to the used power control, DC link voltage control and current control in the grid side power converter, both the power quality and DC link capacitor minimization are ensured. The load side contains three phase voltage source inverter (VSI) in order to supply the three phase induction motor connected to the load. Through the Matlab/Simulink environment software, the obtained performances of the modular AC drive system and motoring and regenerating operation modes are shown. |
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