Abstract:
The aim of this paper is to achieve maximum voltage sag compensation of
52% using direct converter based DVR. The DVR topology has only two
switches. The DVR is designed to compensate the voltage sag in a phase by
taking power from the same phase. A direct converter is connected between
the series transformer and the line in which sag compensation is to be
achieved. If the actual amplitude of the error signal is used and the amplitude
of carrier signal is kept at 1 unit, it is possible to achieve only 22% of sag
compensation. If the amplitude of the carrier signal is modulated according
to the percentage of existing sag, 52% of the sag is compensated through
ordinary PWM technique with the THD less than 5%. Matlab Simulation
results are presented for the validating the analysis.
