Modeling and Analysis of Quasi-Z Source IMC Converter Feeding PMSM Drive System

The purpose of this study is to increase the voltage gain (U_g) for a quasi-Z-source indirect matrix converter (IMC) feeding a three-phase Permanent Magnet Synchronous machine (PMSM) drive system. Due to the low U_g of the IMC, a quasi-Z-source development was connected with the traditional IMC to boost the motor's supply voltage. Space Vector modulation (SVPWM) was used to generate the required switching signals (PWM) for the proposed converter. The system U_g increased as a result of the shoot-through duty (D) of the rectifier side, which increases the output voltage amplitude for the quasi-Z-source system. The proposed converter can regulate the output voltage of quasi-Z-source IMC automatically under voltage sag, step changes in applied load torque on the motor, and changes in the desired speed when the required U_g of quasi-Z-source IMC is greater than 0.866. This value is achieved by choosing the optimized value of D and the modulation index of the rectifier side (m_o). Variable speed from zero to the rated value can be controlled by using closed-loop field-oriented control. The proposed converter was simulated in the MATLAB/Simulink environment to verify the system's efficiency.