Modeling, simulation, and implementation of three-phase Z-source inverter

Abstract

This report presents a comprehensive study on Z-Source Inverters (ZSIs), covering their modelling, simulation, and real-time implementation for induction motor drives. Five Pulse Width Modulation (PWM) control methods for three-phase ZSIs are comparatively analyzed using MATLAB/Simulink: Simple Boost Control (SBC), Maximum Boost Control (MBC), Maximum Constant Boost Control (MCBC), MCBC with Third Harmonic Injection (MCBC+THI), and Space Vector Modulation (SVM). The performance of each method is evaluated under LCL-filtere dresistive and open-loo pinduction motor loads, considering voltage gain, total harmonic distortion (THD), and dynamic response. Simulation results indicate that SBC is the simplest but offers the lowest voltage gain and highest THD. MBC provides the highest boost with increased ripple, while MCBC balances stable gain with moderate distortion. MCBC+THI effectively reduces harmonics, and SVM consistently delivers superior performance with high gain, low THD, and excellent dynamic response. Additionally, the practical implementation of a ZSI feeding a three-phase induction motor using the SBC strategy validates theoretical expectations, demonstrating effectiv eshoot-throug hinsertion, stable DC-link voltage eboosting, and reliable motor operation. The study also investigates ZSIs in PV-powered induction motor drive systems, showing that SVM and MCBC+THI maintain stable DC-link voltage and motor speed under varying solarir radiance. These finding soff ercomprehensi veguidance for selecting optimal ZSI control methods across diverse applications, from simulation to real time implementation.