Z-SOURCE INVERTER FED INDUCTION MOTOR DRIVE PERFORMANCE ANALYSIS

For the Z-source inverter, which can achieve maximum voltage boost for a fixed modulation index, performance analysis and simulation of maximum constant boost-control using third harmonic injection techniques are presented in this work. Recently, a novel power conversion idea known as the Z-source inverter was created, primarily for fuel cell vehicle applications. The Z-source inverter may be used in all ac and dc power conversion applications and has several advantages over regular inverters. Z-source inverters are controllable using all conventional PWM techniques. Maximum constant boost control techniques reduce the voltage strains on switching devices while eliminating low-frequency ripples in the inductor current and capacitor voltage by keeping the shoot-through duty cycle constant. While the Z-source network design in the maximum constant boost control technique is solely reliant on the switching frequency and is independent of the output frequency, the maximum boost control method is only appropriate for output frequencies that are reasonably high. This study determines Z-source inverter parameters for a maximum constant boost control technique for a fixed modulation index. Simulation and tests are used to verify the results, which include boost factor, output dc link voltage, capacitor voltage, output ac voltage, voltage gain, etc.