Small Signal Model of the Three-Phase AC-DC Current Injection Hybrid Resonant Converter

This paper describes the derivation of a small-signal model for the three-phase ac-dc Current Injection Hybrid Resonant Converter (CIHRC). This derivation was required to form the basis for the design of the closed-loop controller in order to regulate the output dc voltage. The analysis of a small-signal model for the CIHRC was done by considering that the converter would involve two stages; the line-frequency rectifier, and high-frequency resonant circuit. The developed small-signal model showed a good basis for the design of an output voltage controller for the converter since the output voltage transient was accurately predicted. The validation of the small-signal model was done through the MATLAB/Simulink simulation model.