A Three-Phase Five-Level Active-Neutral-Point-Clamped Z-Source Inverter

This paper presents a three-phase five-level active-neutral-point-clamped Z-source inverter which combines a modified Z-source network with a three-phase active-neutral-point-clamped 5-level (ANPC-5L) topology. The proposed inverter has high boost factor and improved performance even at low power factor loads. Switching state redundancies of the topology allows easy balancing of capacitor voltages. Operation modes at high and low power factors, voltage relationships, modulation technique and control signal generation for the active switches are described in detail. Simple boost control with carrier-based SVPWM method is used for modulation. MATLAB simulation of the proposed topology, on a 5.4HP, 400V three-phase V/f controlled induction motor drive, is used to verify the performance of the inverter circuit.