New hybrid‐microgrid topology using a bidirectional interleaved converter as a robust power interface operating in grid‐connected and islanded modes

This study presents a new microgrid topology that uses a bidirectional interleaved converter performing a power interface between DC buses in a hybrid microgrid allowing for both grid‐connected and islanded modes. The authors propose a new control strategy and controllers' design method aiming at achieving a high‐performance dynamic response regarding the converter load and generation disturbance rejection capability. In the grid‐connected mode, the interleaved converter operates in the buck mode providing a high‐power‐quality DC microgrid voltage. In the islanded mode, the interleaved converter operates in the boost mode and it is responsible for regulating the DC link of the back‐to‐back converter that connects the main grid to the AC microgrid. A detailed mathematical model is presented to obtain a MIMO system that takes into account the system's disturbances to analyze both stability margins and disturbance‐rejection response. Simulations of the proposed topology are carried out in PSCAD/EMTDC in a microgrid operating in grid‐connected and islanded operation modes. Experimental results are provided in order to validate the proposed control tuning method.