This paper presents the small signal modeling using the state space averaging
technique and reliability analysis of a three-phase z-source ac-ac converter. By controlling
the shoot-through duty ratio, it can operate in buck-boost mode and maintain desired
output voltage during voltage sag and surge condition. It has faster dynamic response and
higher efficiency as compared to the traditional voltage regulator. Small signal analysis
derives different control transfer functions and this leads to design a suitable controller
for a closed loop system during supply voltage variation. The closed loop system of the
converter with a PID controller eliminates the transients in output voltage and provides
steady state regulated output. The proposed model designed in the RT-LAB and executed
in a field programming gate array (FPGA)-based real-time digital simulator at a fixedtime
step of 10 μs and a constant switching frequency of 10 kHz. The simulator was developed
using very high speed integrated circuit hardware description language (VHDL),
making it versatile and moveable. Hardware-in-the-loop (HIL) simulation results are presented
to justify the MATLAB simulation results during supply voltage variation of the
three phase z-source ac-ac converter. The reliability analysis has been applied to the
converter to find out the failure rate of its different components.
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