Single phase Z-source inverter for photovoltaic system

This paper proposes Z (Impedance)-source inverter for single phase grid connected photovoltaic system. Unlike traditional voltage source inverter, Z-source inverter uses shoot-through (ST) duty cycle and modulation index to control output voltage. By modifying the traditional pulse width modulation (PWM) techniques, shoot through duty is accommodated to buck or boost the input voltage. Z-source network provides single stage power conversion. This paper summarizes brief calculation for circuit capacitors and inductors. The design parameter are validated by simulating the performance of an example photovoltaic (PV) module under MATLAB/Simulink environment.

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