Design and Implementation of a Single-Band Hysteresis Current Controlled H-Bridge Inverter

Abstract

To ensure proper power flow while maintaining stability during grid disturbances and power quality enhancements the utility interface voltage source inverters (VSI) need vital current regulation and synchronization. For this kind of applications, the non-linear current control of VSI using hysteresis current regulation offers distinct advantages in contrast with linear current regulation scheme. In this paper, Hysteresis Current Control (HCC) strategy has been used to decide the switching pulse of the single-phase VSI with a fixed single hysteresis band. An instantaneous inductor current feedback loop along with the HCC is digitally incorporated in dSPACE RTI1103 controller to generate the switching pulses for the VSI. Both simulation and experimental results are provided to verify the feasibility and performance of this control technique. An LC filter is appended at $1-\phi$ inverter output terminals to ensure low output current ripple and lower Total Harmonic Distortion (THD).