Design of Z- Source Inverter andControl Switch Logic to Drive ZSI

Abstract

Since the beginning of technological improvement, solar energy has long been recognized as a
reliable source of alternative energy sources for non-renewable energy sources. Residents use large
amounts of solar energy to reduce electricity bills while reducing dependence on fossil fuels to
generate electricity. Accordingly, the conventional Z-source network and switch inductor Z- source
inverter is located between the DC voltage source and the inverter, which boosts the DC voltage.
Traditional inverters such as voltage source inverters and current source inverters have few inherent
limitations such as output voltage is limited to its input applied voltage and usually, V-source
inverters act like a buck converter, and likewise, I-source inverters operate as a boost converter. This
two-stage configuration increases cost and reduces system efficiency. Also, the pass-through problem
in the VSI and the open-circuit problem in the CSI are significant problems in system reliability. The
structure proposed to overcome the above issues is a Z-source inverter (ZSI), which has a singlestage power conversion and a buck-boost voltage capability, unlike VSI and CSI inverters. In this
paper, the main objective is to designs a Z-source network circuit, and to develop control logic, that
would supply SPWM switching signals to IGBT gates. For this, Simple constant boost control strategy
has been developed and simulated in MATLAB / Simulink. For analysis, THD of the conventional Zsource inverter is 2.3% while to compare thisto see that the total harmonic distortion is better than
traditional converters.