Z-SOURCE INVERTER WITH A NEW
SPACE VECTOR PWM ALGORITHM FOR HIGH VOLTAGE GAIN
ABSTRACT:
This paper presents
a methodology to apply a novel space vector pulse width modulation control for
three phase Z-source inverter. The space vector modulation for the conventional
voltage source inverter is modified so that the additional shoot-through states
are inserted within the zero states. So zero voltage time period is diminished
for generating a shoot-through time, and active states are unchanged. The
shoot-through states are evenly distributed to each phase within zero state.
The shoot-through time is used for controlling the dc link voltage boost and
hence the output voltage boost of the inverter. This new method provides a high
voltage gain at higher modulation index. The proposed algorithm is verified
with simulation and experiment. MatLab/Simulink is used for simulating the
complete circuit with RL load. The frequency spectra of the output voltage and
current are explored.
KEYWORDS:
1. voltage gain
2. Z-source inverter
3. Space vector PWM
4. Current source inverter
5. Total harmonic distortion.
SOFTWARE: MATLAB/SIMULINK
CIRCUIT DIAGRAM:
EXPECTED SIMULATION RESULTS:
CONCLUSION:
A novel modified space vector PWM control method was carried out
in this paper for three phase Z-source inverter. In this modified SVPWM method
four shoot-through states were inserted in each sector for controlling the
output voltage of Z-source inverter. The output AC voltage obtained from ZSI is
no longer limited and can be boosted beyond the limit imposed by conventional
VSI. Using MatLab/Simulink software package the simulation was performed to
validate the proposed algorithm. The frequency spectra and the total harmonic
distortion of the load current and voltages were obtained. Also the presented
concepts were verified experimentally using a laboratory prototype.
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