Optimal Component Design of a Solar-Fed Modified Z-Source Inverter for Induction Motor Drive Systems

Abstract

This paper examines the performance of an induction motor drive system utilizing a cost-effective induction motor in conjunction with a reduced-switch, three-phase modified Z-source inverter (RSTPZSI). In the proposed approach, a 4-switch, 3-phase modified Z-source inverter replaces the conventional 6-switch, 3-phase inverter (6S3P). By employing this novel inverter configuration, the modified Z-source system delivers improved performance while reducing construction costs. A key feature of the proposed model is the inclusion of a specific LC network in the DC link and a DC link capacitor that replaces the capacitor leg typically found in traditional inverters. This redesigned Z-source inverter is capable of producing output voltages higher than the line voltage. To validate this approach, simulation results were compared with those of the traditional six-switch inverter. The system was implemented in real-time using a PIC16F84A microcontroller on a 0.5 HP motor prototype. Both theoretical analysis and experimental results demonstrate that the modified Z-source inverter reduces line harmonics, improves power factor and reliability, and extends the output voltage range.