| Title |
Dynamic Modeling and Controller Design for Grid-Connected ?uk CCM Inverter with Coupled Inductor |
| Authors |
김상오(Sang-Oh Kim) ; 한병철(Byeongcheol Han) |
| DOI |
https://doi.org/10.5370/KIEE.2022.71.1.079 |
| Keywords |
Repetitive controller; Microinverter; Coupled inductor; single-phase inverter |
| Abstract |
This paper presents a dynamic modeling and controller design for a grid?connected ?uk continuous conduction mode (CCM) inverter with a coupled inductor. The primary- and secondary-side inductors of the conventional ?uk converter are integrated into one coupled inductor in the presented ?uk CCM inverter, and it reduces the number of passive components. To make the ?uk CCM inverter with a coupled inductor connected with the grid utility, an output current controller should be designed appropriately.
However, the output current control of the presented ?uk inverter is difficult due to the existence of the right-half plane (RHP) zeros in its transfer function. To solve the problem, a dynamic model of the ?uk CCM inverter with a coupled inductor is developed and a repetitive controller (RC) coupled with feedback and feedforward controllers is applied to this inverter. A practical design guideline is also presented to select control parameters. Experimental results using a 200-W prototype demonstrate the acceptable performance of the proposed controller. |