The ANALYSIS OF REDUCTION IN SWITCHING LOSS WITH FEEDFORWARD CONTROL IN GRID-TIED MICRO GRID SYSTEM

CrossRef DOI: 10.56815/IJAHSS.V1.N2.1-4

Abstract

This paper proposes the simplified pulse width
modulation (PWM ) strategy in the bidirectional
ac/dc single-phase converter with the feed-forward
control scheme. In this, the number of switching of
the proposed simplified PWM strategy is reduced to
one-fourth to that of the unipolar & bipolar PWM.
The feed-forward control scheme is used to achieve
better performance of the ac/dc converter in both the
rectifier & inverter mode as compared with the
conventional dual-loop control scheme. The
simplified PWM strategy with feed-forward control
scheme has higher efficiency than that of the unipolar
PWM & bipolar PWM strategies. Also, the total
harmonic distortion is less in this PWM strategy. The
simulation & experiments are carried out to verify the
validity of the proposed PWM strategy & control
scheme. The proposed simplified PWM strategy with
the proposed feedforward control scheme has lower
total harmonic distortion than the bipolar PWM and
higher efficiency than both unipolar and bipolar
PWMs. Furthermore, the proposed simplified PWM
operated in the inverter mode also has larger
available fundamental output voltage VAB than both
the unipolar and bipolar PWMs. A prototype system
is constructed and the control scheme is implemented
using FPGA Spartan-3E XC3S250E. Both simulation
and experimental results verify.