TITLE:
Ride through Strategy for a Three-Level Dual Z-Source Inverter Using TRIAC
AUTHORS:
A. Nazar Ali, Dr. R. Jeyabharath
KEYWORDS:
Common Mode Voltage, Fault Compensation, Three-Level Inverter, Sinusoidal Pulse Width Modulation, Z-Source Inverter
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.11,
September
30,
2016
ABSTRACT: A new ride through strategy is introduced in a three-level
dual Z-source inverter, for isolation under semiconductor switching failure
condition. Here the output will have no significant decrease in the amplitude
and quality. Instead of diodes, the triacs are added to the inverter source
ends, as it can perform a bidirectional power transfer also it can operate well
in both low and high voltage operating conditions. The faulted part can be
isolated by simply altering the firing pulses for turning on/off the triacs
using the carrier based SPWM technique and resulting in a boosting output with zero common mode voltage. Consequently, it forms a common floating point or null point with a zero common mode
voltage. It is experimentally verified by using MATLAB, and digital oscilloscope.