Simulation of Single-Phase Z-Source Inverter

A single-phase Z-source inverter represents a specialized inverter topology that utilizes a unique impedance network to achieve voltage boost functionality unattainable by conventional inverters. This topology finds extensive applications in renewable energy systems, electric vehicles, and other scenarios requiring voltage regulation.

The simulation employs Sinusoidal Pulse Width Modulation (SPWM) as the core control strategy. In code implementation, SPWM compares high-frequency carrier signals with low-frequency modulation waves to generate switching signals, which simultaneously achieve sinusoidal output voltage waveform shaping and Z-network boost control. The algorithm typically involves generating triangular carrier waves and sinusoidal reference waves, then comparing their instantaneous values to determine switching states.

Key simulation considerations include: The selection of impedance network capacitor and inductor parameters directly impacts boost capability and output waveform quality; Modulation index and switching frequency settings require balancing harmonic content against switching losses; The timing and duty cycle of shoot-through state insertion determine the final voltage gain. In MATLAB/Simulink implementations, these parameters are typically defined as variables in the initialization script for easy optimization.

This simulation enables pre-validation of control algorithm effectiveness and circuit parameter optimization, providing reliable theoretical foundations for hardware implementation. Simulation results generally include performance metrics such as output voltage/current waveforms, Total Harmonic Distortion (THD) analysis, and dynamic responses under varying load conditions. The code structure typically separates power circuit components, control logic blocks, and measurement/analysis modules for maintainability.