| Abstract |
This paper proposes a control scheme of single-phase
to three-phase PWM converters for low power three-phase
induction motor drives, where a single-phase half-bridge PWM
rectifier and a two-leg inverter are used. With this converter
topology, the number of switching devices is reduced to six from
ten in case of full-bridge rectifier and three-leg inverter systems.
In addition, the source voltage sensor is eliminated with a state
observer which controls the deviation between the model current
and the system current to be zero. A simple voltage modulation
method is used for a two-leg inverter and a new technique to
eliminate the effect of the dc link ripple voltage on the output
current is proposed. Though the converter topology itself is of
lower cost than the conventional one, it retains such functions as
sinusoidal input current, unity power factor, dc-link voltage
control, bidirectional power flow, and VVVF output voltage. The
experimental results for the V/F control of 3Hp induction motor
drives controlled by a DSP TMS320C31 chip have verified the
effectiveness of the proposed scheme. |
