Interruption Avoidance with Space Vector Modified Pulse Width Modulation for Z-Source Inverter

The AC output voltage is always higher than the input DC voltage in Z-Source Inverter. Z-Source Inverter uses a Impedance network to boost DC input voltage without the use of DC-DC converter, but Z-source capacitors lead to interruptions. However, the higher rate of interruptions is directly proportional to higher instantaneous current rate. In recent years, the Z-Source Inverter is introduced in Dynamic Voltage Restorer to control voltage disturbances in the industrialized services. The biggest disadvantage faced by the Dynamic Voltage Restorer (DVR) system is its inability to mitigate the interruptions. Due to the occurrence of interruptions, the DVR collect the faults in the system but it reduces the peak voltage. In order to improve the peak voltage factor on the single phase ZSI, Dynamic Space Vector Modified Pulse Width Modulation (DSV-MPWM) scheme is proposed in this thesis. Initially, Dynamic Space Vector is developed in Z-Source Inverter and results in interruption free transmission system. The interruption avoidance is achieved with the help of switched capacitor integrator and also the current rate is reduced in DSV-MPWM scheme. Secondly, Modified Pulse Width Modulation in DSV-MPWM controls the Z-Source Inverter by generating higher voltage shoots through states. Finally, Hierarchical Dynamic Service Lookup Address Table works on varying dynamic topological circuit design to produce higher voltage factor. Therefore, DSV-MPWM scheme increases the output voltage factor by avoiding the interruptions in the Dynamic Voltage Restorer (DVR). The interruption avoidance automatically attains fault free transmission circuit. Simulation is conducted on factors such as DVR Voltage Magnitude, Source Output Current Magnitude Rate, and Normalized Capacitor Voltage Gain rate.