Simple Boost Control of Five-Level Z-Source Diode-Clamped Inverter by Multi-Carrier PWM Methods

摘要

In recent years, multilevel inverters have drawn significant attention in research and high power applications such as AC Transmission systems (FACTS), renewable energy resources, power quality devices, etc. Such power converters have been the prime focus of power electronic researches in order to improve their performance, reliability and energy efficient at minimum cost. Amo ng several reported topologies, diode-clamped multilevel inverter is very used. To control these multilevel inverters several carrier ¨Cbased PWM strategies have been reported. Traditional inverters are known to produce an output voltage that is lower than the DC source voltage. In order to reach boosted voltage with available switching devices Z-source inverters were invented. Multilevel Z-source inverters have been proposed as a solution for HV applications. This type of inverters decreases the Total Harmonic Distortion (THD) and has a good performance for different applications such a s Flexible AC Transmission systems, power quality improvement and connecting renewable energy resources to the network. This paper compares several alternative carrier disposition PWM strategies (Phase Disposition (PD) method, Alternative Phase Opposition Disposition (APOD) method) for a five level Z-source diode¨Cclamped inverter. These strategies are simulated in MATLAB/Simulink.The simulation results w ill illustrate the performance of Phase Disposition (PD) method, Alternative Phase Opposition Disposition (APOD) method