A Direct Peak DC-link Boost Voltage Control Strategy in Z-Source Inverter

Abstract

A PID controller for direct peak dc-link boost voltage in Z-source inverter has been introduced. With this technique a high-performance inverter output voltage can be achieved with an excellent transient performance which enhances the rejection of disturbance, including the input voltage ripple and load current variation, and have good ride-through for voltage-sags. The peak dc-link voltage direct sensing & scaling method, and modified modulation strategy have been described, which simplify the controller design, improve the transient response and decrease the voltage stress across the switches. The proposed technique was verified on a 10-kW prototype. The experimental results meet the simulation and analysis results very well.