| Abstract |
This paper presents a new converter topology allowing power regeneration from a three-phase induction machine to the single-phase source. At the input side, it has a switch mode rectifier (SMR) composed mainly by two transistors with their antiparalel diodes and two filter capacitors. The output stage has four transistors and four diodes working as an asymmetric inverter. The power semiconductors have the same topology of the well known three-phase voltage source inverter, resulting in a very compact and simple converter. Two control loops are used to control the machine currents. Two additional control loops are used for the control of the input current waveform and for the voltage of the filter capacitors. An additional loop ensures the balancing of capacitors voltages. The method of field orientation, also called vector control, is used to control the speed and flux of the machine. The converter works with practically sinusoidal input current and high power factor (PF > 0.99) and it delivers to the motor balanced three-phase currents with variable frequency and amplitude, having low distortion. The interaction belween converter and motor is studied. The whole control system presents a good dynamic behaviour.
Finally, the regeneration capability of the converter is also confirmed. |
